Engine sound replication device
US007979147B1
(12) United States Patent
US 7,979,147 B1
(10) Patent N0.:
(45) Date of Patent:
Dunn
(54)
ENGINE SOUND REPLICATION DEVICE
(76)
Inventor:
Jul. 12, 2011
OTHER PUBLICATIONS
James Francis Dunn, San Rafael, CA
(Us)
BlueOBD, “bluetooth project based on OBD-2 chipset”, Aug. 6,
2007 (via Webarchiveorg), wwwblueobdcom, entire document.*
* cited by examiner
*
Notice:
Sub'ect
to any disclaimer, the term of this
J
patent is extended or adjusted under 35
Primary Examiner * Curtis KuntZ
U.S.C. 154(b) by 0 days.
Assistant Examiner * Jesse Elbin
(74) Attorney, Agent, or Firm * Risto A. Rinne, Jr.
(21) App1.No.: 12/2s7,193
(22) Filed:
(51)
(57)
Oct. 6, 2008
Int. Cl.
G06F 17/00
H03G 3/00
G10K 11/00
G10L 21/00
(2006.01)
(2006.01)
(2006.01)
(2006.01)
(52)
US. Cl. ........... .. 700/94; 381/61; 181/192; 704/504
(58)
Field of Classi?cation Search .................. .. 381/61;
181/192, 227, 228; 700/94; 704/504
See application ?le for complete search history.
(56)
References Cited
5,820,442 A *
2004/0167761
10/1998
Helder .......................... .. 381/61
3/2002 Plugge et a1.
... ....
An apparatus for replicating an engine and/or exhaust sound
of a predetermined vehicle includes ?les stored in computer
readable form in a memory library of the engine and/or
exhaust sound of the predetermined vehicle. A microcom
puter operated controller receives engine data such as the
RPM of the engine of the personal vehicle and continually
selects Which ?les to obtain anduse. The controller adjusts the
soundpattern to optimally correspond in a preferred Way With
the RPM of the engine of the personal vehicle and the con
troller provides an output signal that is ampli?ed and fed to a
speaker for audio playback of a replicated sound of the engine
and/or exhaust sound of the predetermined vehicle in the
personal vehicle. A speaker disposed outside the vehicle
includes a conical or cylindrical shape. A diagnostic capabil
U.S. PATENT DOCUMENTS
6,356,185 B1*
ABSTRACT
381/61
A1*
8/2004
SiZ0v
2006/0074645 A1*
4/2006
Tischer ....................... .. 704/226
. . . . ..
ity is also disclosed. Connection to an OBD II connector
provides the desired engine data.
703/8
29 Claims, 5 Drawing Sheets
1
F
Obtain engine RPM data
1
J
Determine which predetermined
automobile is to be replicated
for its exhaust
Obtain appropriate recorded
sound from memory library
Obtain make & model
information of personal vehicle
Create running real-time output
signal that correlates replicated
exhaust sound with speed and
operating condition of personal
vehicle
Provide output signal to audio
system
US. Patent
Jul. 12, 2011
Sheet 2 015
US 7,979,147 B1
US. Patent
Jul. 12, 2011
Sheet 3 015
US 7,979,147 B1
.0A8l.;
m,GE
US. Patent
Jul. 12, 2011
Sheet 4 015
US 7,979,147 B1
l
Obtain engine RPM data
l
Determine which predetermined
automobile is to be replicated
for its exhaust
l
Obtain appropriate recorded
sound from memory library
l
Obtain make A’: model
in formation of person al vehicle
Create running real-time output
signal that correlates replicated
exhaust sound with speed and
operating condition of personal
vehicle
l
Provide output signal to audio
system
FIG. 4
US. Patent
Jul. 12, 2011
22b
Sheet 5 015
70
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US 7,979,147 B1
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US 7,979,147 B1
1
2
ENGINE SOUND REPLICATION DEVICE
Many people prefer a more robust sound to their exhaust
and may be inclined to put a louder after-market exhaust
system on an automobile that is used on public roads. Doing
so places them at risk for citation and ?ne.
For all exhaust systems, stock or after-market, the sound
volume of the exhaust is not in any practical Way, adjustable.
This is because the volume that an exhaust system produces is
not a user-controllable variable, other than hoW it relates to
RPM and load.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention, in general, relates to motor vehicles
and, more particularly, to the exhaust sound produced by
automobiles or other types of motor vehicles.
Having internal combustion engines, motor vehicles have,
since their inception, produced an audible and, at times, dis
tinct exhaust sound. The sound that is produced often varies
from automobile to automobile. For example, the exhaust
For virtually all automobiles, the volume (sound pressure)
varies With the speed of the engine and the load upon the
engine. For any given engine, the exhaust volume typically
rises With an increase in engine speed (RPM) and loWers With
a lessening of engine speed. The exhaust volume also typi
cally rises With an increase in load upon the engine. For
example, most automobile engines Will produce a louder
exhaust sound When the engine reaches high RPM during
sound from an eight cylinder muscle car, such as an old
CHEVROLET CORVETTE, is quite different than the
exhaust sound of a modern FERRARI.
The exhaust sound that an automobile produces is impor
tant to many people. When the MIATA model Was introduced,
MAZDA MOTOR COMPANY as the maker of the MIATA,
claimed to have tried over 200 different exhaust con?gura
tions in an attempt to obtain an optimum sounding exhaust
acceleration than it Would at the same high RPM but under no
load, such as When the vehicle is in neutral.
20
system.
Many people have developed a general preference for hoW
erating. Some vehicles may even back?re and produce a
an automobile should ideally sound. For example, some
people prefer the sound of tWelve cylinder relatively high
25
RPM automobile engines While other prefer the deeper sound
of loW RPM large displacement engines. In fact, the sound of
a particular vintage automobile may have become associated
With a period in a person’s life and, upon again hearing that
sound, it may trigger fond memories and thereby, even cause
an uplifting of spirit. That person may indeed long for an
and engine speed because normal driving conditions vary and
30
some vintage, classic, or unusual automobile.
HoWever, that is di?icult to achieve. Vintage, classic, or
35
expensive for most people. With today’s available automo
biles, many of the models have similar identical poWer plants
(i.e., engines). Accordingly, there may be little difference in
the sound among the many models that are available. Even
among the various models there may not be an appreciable
difference in the sound from one manufacturer to another.
As a result people spend a good deal of money purchasing
after-market exhaust systems in order to endoW their particu
lar car, truck, or motorcycle With a unique sound that they
hope Will be pleasing to their ears and also pleasing to the ears
of others.
The problem is that they cannot knoW ahead of time What
comparable to that of other vehicles, thereby raising the
street Would not Want their exhaust sound to be excessively
40
loud, less they attract undo attention and possibly receive a
citation. HoWever, When the same person Was pleasure-driv
ing the same motor vehicle on a remote rural road he or she
might prefer a louder exhaust sound. With both stock and
45
50
after-market exhaust systems, this has, heretobefore, been
impossible to attain.
The exhaust sound is also useful in alerting pedestrians of
the approach of a motor vehicle. As such, there is bene?t in
being able to audibly detect an approaching automobile. For
example certain of the neWer electric or hybrid automobiles,
When running only on electricity, are very nearly silent in
operation.
are basically bound to endure it or replace it With yet another
after-market exhaust system. If the ?rst exhaust system is
replaced, then its entire cost is typically absorbed by the
end-user; not a pleasant situation.
The maximum legal volume permitted for a motor vehi
impose various loads upon an engine during use. In other
Words, if a person had an exhaust system that, at times, Was
too loud (i.e., not “street-legal”), the person could not merely
drive at idle or very loW engine speeds When on public roads
to lessen the volume of exhaust sound. At times, the driver
Would have to accelerate in order to reach a safe driving speed
exhaust volume beyond an acceptable level.
Yet, a long-standing need to vary the volume of exhaust
(i.e., engine sound) does exist. A person driving on a busy city
the after-market exhaust system Will sound like on their par
ticular motor vehicle until after they have purchased it and
installed it. Then, if they do not like the sound it produces they
louder sound (i.e., greater sound pressure) When decelerating
rather than accelerating.
With conventional exhaust systems it is not possible to
effectively control the volume of exhaust by a control of load
automobile that produces the particular exhaust sound of
exotic automobiles are in limited supply and are far too
Whether the vehicle is accelerating or decelerating also
matters. Many vehicles produce an entirely different sound
depending upon Whether the vehicle is accelerating or decel
55
This has caused problems because people, unaWare of their
approach, have entered into the path of an approaching and
especially quiet automobile. This is a problem for normally
sighted people and can be especially serious for the visually
cle’s exhaust sound (i.e., pressure) is generally regulated for
impaired. As a result, a motor vehicle that is too quiet is, at
all vehicles that are used on public roads and highWays.
Regulations may be set by local governments, the state, or the
times, dangerous and this realiZation has prompted the con
sideration of legislation intended to require that motor
Federal government. These regulations limit the sound pres
sure (i.e., volume) that most vehicles can produce.
Many after-market exhaust systems are louder than stock
vehicles produce some sort of an audible sound.
60
exhaust systems and some after-market exhaust systems may,
at times, exceed permissible maximum volume levels (typi
cally measured in decibels). As used herein, the term “after
market” is broad and includes any exhaust system component
that may replace or be added as an additional component to an
existing (i.e., stock) exhaust system.
There has, heretobefore, been no aesthetically acceptable
Way of producing an acceptable sound, such as an exhaust
sound, for motor vehicles that is both pleasing to the ear and
of appropriate volume so as to be useful in Warning pedestri
ans of the approaching vehicle at a safe distance.
65
Also, there is the problem of acclimation and boredom.
People get used to the Way their automobile sounds and,
consequently, their ability to enjoy the sound of their vehicle
US 7,979,147 B1
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3
diminishes With time. This is the result of becoming accli
The need to make an automobile sound different is not
mated to the vehicle’s sound and the result is a loss of aWare
con?ned to making it sound only like other automobiles. For
example, a pilot might Want to make his personal vehicle (car)
ness. Drivers may genuinely enjoy the Way their vehicle
sounds and over the course of time the same sound that at one
sound like a P51 Mustang or some other type of current or
time delighted their senses may become boring and even
monotonous. Ideally, a driver Would Want to vary the charac
ter of exhaust so that it replicates the exhaust sound produces
by different vehicles from time to time.
vintage airplane. Similarly, a boating enthusiast might Want
to make his personal vehicle sound like a vintage boat, for
example, an old Chris Craft. Continuing the need, a motor
cycle enthusiast might Want his personal vehicle to sound like
a Harley-Davidson or some other vintage motorcycle.
It is also important to note that the exhaust system and its
The ability to instantaneously change the character of
exhaust sound and its volume have not been satis?ed by any
of the prior art solutions.
Sometimes, the driver may Want to alter the sound that is
output may be regulated, as previously mentioned, by local,
heard primarily in the cockpit (i.e., in the interior) of the
state, or Federal laWs, Whereas an audio output may not be
regulated or it may not be regulated in the same manner.
automobile and not that Which is heard by others, for
example, by pedestrians as the vehicle passes by. At other
times, the driver may Want to alter the sound that is produced
by the vehicle and Which others hear. Still, at other times the
certain types of vehicles or it may be prohibited to make
modi?cation to the exhaust system that increases the volume
of the exhaust noise produced it may be permissible to include
driver may Want a combination of the tWo Whereby the sound
that is produced in the vehicle’s interior is varied at the same
an audio output of any preferred volume that replicates
exhaust sound and thereby accomplishes the desired effect
time that the exterior sound that is produced externally is also
While it may be prohibited to modify the exhaust system for
20
varied.
This is because the exhaust sound that a driver typically
adequately satisfy various important requirements as
hears is a combination of sounds. It includes sounds that are
coming directly from the engine compartment as Well as
sounds that are coming from the exhaust. Depending on the
Without infraction of any laWs.
All of the prior art solutions to this date have failed to
described above and beloW and, as a result, a desirable solu
tion is not yet commercially available.
25
As an example of various additional needs that have not
type of vehicle the balance of these sounds can vary. For
been satis?ed, there is a need for both rapid and uncompli
example, With roadsters and convertibles a larger percentage
of the sound that is heard by the driver Will typically emanate
plugged into a single connector in the vehicle and be ready for
cated installation. Ideally, the device Would require it being
from the exhaust While for certain sedans it may include more
of the engine sounds coming from the engine compartment.
use.
30
It is desirable to alloW driver’s to enjoy Whatever sound
If communication betWeen the device and a stereo system
in the vehicle Were Wireless, then the need to run electrical
combination they prefer and to be able to direct that sound
cables and pay for complicated or expensive electrical Wiring
primarily in the interior of the vehicle or externally or both.
Would be eliminated.
The characteristic sound of an automobile is a variable, as
Was previously mentioned, because it varies With engine
speed and With load. Therefore, it has not been possible to
effectively replicate the exhaust sounds of different motor
35
vehicles for use in a dynamic environment.
devices as platforms. This can reduce the cost of such a device
In other Words, if a particular vintage automobile’ s exhaust
sound Was recorded and played through an automobile’ s ste 40
reo system, this Would not be pleasing to a user of such a
system because the sound that is being heard Would not cor
relate to What the automobile is doing. A driver Would not
appreciate listening to the vintage car accelerate While they
Were idling at a stop light, nor Would they appreciate the
sound of the vintage car at idle While they Were accelerating.
To be realistic, the sound that is produced must be synchro
niZed With the engine speed of the vehicle in Which it is heard.
replication device that helps to ameliorate the above-men
tioned problems and dif?culties as Well as ameliorate those
additional problems and di?iculties as may be recited in the
“OBJECTS AND SUMMARY OF THE INVENTION” or
discussed elseWhere in the speci?cation, or Which may oth
50
herein.
Clearly, such an apparatus Would be a useful and desirable
device.
erWise exist or occur and are not speci?cally mentioned
motor vehicle in Which it is overlaid.
For example, if a driver is listening to the recorded sound
produced by a vintage automobile While driving a personal
vehicle, the vintage vehicle’s sound must match the engine
speed of the personal vehicle. If the personal vehicle is decel
erating, it is desirable that the sound the driver hears re?ect
that of the vintage vehicle When the vintage vehicle is decel
2. Description of PriorArt
Exhaust systems of all types are, in general, knoWn. Engine
55
erating. Conversely, if the personal vehicle is accelerating, it
monitoring equipment is also, generally, knoWn. For
example, the folloWing patents describe certain types of
engine monitoring devices:
US. Pat. No. 6,973,377 to Majstorovic et al., that issued on
is desirable that the sound the driver hears re?ect that of the
vintage vehicle When the vintage vehicle is accelerating.
When the user already has such a platform available. For
example, the IPHONETM is a popular device that could be
used as a platform. Similarly, the IPOD TOUCHTM is another
popular device that could be used as a platform.
Accordingly, there exists today a need for an engine sound
45
Additionally, it Would be even more realistic if it Were
synchronized and adjusted accordingly With the load of the
Ideally, such a device could be installed directly by the
user, or alternately, by those With minimum technical exper
tise.
Additionally, there is a need to use existing technology
Dec. 6, 2005;
60
It is desirable at times to have the exhaust volume that is
US. Pat. No. 7,013,207 to Majstorovic et al., that issued on
externally audible (i.e., to pedestrians) quiet While the
Mar. 14, 2006; and
The entire speci?cation of US. Pat. No. 6,973,377 is
exhaust sound that a driver hears in the cockpit (i.e., interior)
hereby incorporated by Way of reference herein as a part of
this speci?cation.
is loud. The driver may Want to enjoy listening to a loud
replicated engine sound that only they hear Without disturb
ing those Who are external to the vehicle. This has, heretobe
The entire speci?cation of US. Pat. No. 7,013,207 is
hereby incorporated by Way of reference herein as a part of
fore, been impossible to attain.
this speci?cation.
65
US 7,979,147 B1
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6
These prior art references teach devices and methods of
obtaining acceleration and RPM data from an engine that is
useful With the present invention.
Additionally, US. Pat. No. 5,835,605 to Kunimoto that
issued on Nov. 10, 1998 teaches an exhaust sound synthesizer
that is used With ?ight simulators and computer games but
Which differs from the instant invention in material Ways. For
example, it does not include a memory library of engine
sounds from a variety of predetermined vehicles but instead
Still yet another object of the invention is to provide an
engine sound replication device that permits a user to vary the
volume of sound that is produced.
Yet another important object of the invention is to provide
an engine sound replication device that permits a user to
replicate a desired automobile exhaust or engine sound in an
interior of a personal automobile.
Still yet another important object of the invention is to
provide an engine sound replication device that permits a user
to replicate a desired automobile exhaust or engine sound in
includes one basic exhaust Waveform that is taken at different
an exterior of a personal automobile.
periods and Which is selected depending on speed informa
tion supplied by a joystick or acceleration pedal of the game.
The selected Waveform is then subjected to an exhaust pipe
circuit that appears to introduce delays and reverberation into
the Waveform and thereby synthesize an output that sounds
like exhaust operating through one particular muf?er (i.e.,
tailpipe). In short, it is a synthesizer and not a replication
device of engine sounds and thereby teaches aWay from rep
lication.
A ?rst continuing object of the invention is to provide an
engine sound replication device that permits a user to repli
cate a desired automobile exhaust or engine sound in both an
interior and an exterior of a personal automobile simulta
neously.
A second continuing obj ect of the invention is to provide an
engine sound replication device that includes synchroniza
20
Additionally,
US
Patent
Application
Number
20050259830 is for a sound enhancement for a single engine
sensor and thereby does not include the memory library and
other elements of the instant invention as mentioned in the
previous comparison With the knoWn prior art.
Other related prior art patents and publications include:
US. Pat. No. 6,356,185 to Plugge et al., Mar. 12, 2002;
US. Pat. No. 5,820,442 to Helder, Oct. 13, 1998;
US. Pat. No. 5,237,617 to Miller, Aug. 17, 1993;
US. Pat. No. 7,203,321 to Freymann et al., Apr. 10, 2007;
US. Pat. No. 7,088,829 to Schick et al, Aug. 8, 2006;
engine sound replication device that includes synchroniza
tion With the sound that is produced by the device so that it
25
matches the acceleration or deceleration of a personal vehicle
in Which it is used.
A fourth continuing object of the invention is to provide an
engine sound replication device that can make a four cylinder
personal vehicle sound like a six, eight, or tWelve cylinder
30
predetermined vehicle.
A ?fth continuing object of the invention is to provide an
engine sound replication device that can produce a simulated
US. Pat. No. 6,959,094 to Cascone et al, Oct. 25, 2005;
US. Pat. No. 6,859,539 to Maeda, Feb. 22,2005;
US. Pat. No. 6,725,150 to Glandian, Apr. 20, 2004;
US. Pat. No. 6,275,590 to Prus,Aug. 14, 2001;
US. Pat. No. 5,734,726 to Truchsess, 1998;
US. Pat. No. 5,692,052 to Tanaka et al, Nov. 25, 1997;
US. Pat. No. 5,635,903 to Koike et al, Jun. 3, 1997;
US. Pat. No. 5,371,802 to McDonald et al, Dec. 6, 1994;
Patent publication US 2005/ 0259830 to Vaishya, Nov. 24,
tion With the sound that is produced by the device so that it
matches the current engine speed and/ or operating character
istics of a personal vehicle in Which it is used.
A third continuing object of the invention is to provide an
35
40
exhaust or engine sound of a predetermined vehicle that is
realistic.
A sixth continuing object of the invention is to provide an
engine sound replication device that can be adjusted to pro
duce a simulated or replicated exhaust sound that is loud and
Which may exceed a maximum permissible sound pressure
(volume level) for street use When the vehicle is used off road
or in remote areas Where such restrictions do not apply.
A seventh continuing object of the invention is to provide
2005;
an engine sound replication device that includes in memory at
least one recording of an engine or engine exhaust sound
Patent publication US 2007/0147626 to Casey et al., Jun.
produced by a predetermined vehicle, a computer that is able
28, 2007;
While the structural arrangements of the above described
device may, at ?rst appearance, have certain distant similari
ties With the present invention, it differs in material respects.
These differences, Which Will be described in more detail
hereinafter, are essential for the effective use of the invention
and Which admit of the advantages that are not available With
45
to access the memory, means for determining the engine RPM
of a personal vehicle in Which the device is to be used, soft
Ware adapted to produce an output signal by modifying the
recording of an engine or engine exhaust sound, and Wherein
50
the output signal can be used to drive a speaker, either directly
or by passing the output signal to an ampli?er or a stereo
system prior to connection to the speaker, the output signal
any of the knoWn prior art devices.
being further controlled by the computer so as to correspond
With the engine speed of the personal vehicle.
An eighth continuing object of the invention is to provide
OBJECTS AND SUMMARY OF THE
INVENTION
55
It is an object of the present invention to provide an engine
sound replication device that is inexpensive to manufacture.
It is also an important object of the invention to provide an
engine sound replication device that can replicate the exhaust
sound of a predetermined vehicle.
Another object of the invention is to provide an engine
sound replication device that can replicate the engine and/or
exhaust sound of a predetermined vehicle.
Still another object of the invention is to provide an engine
sound replication device that permits a user to select a sound
from a library that includes a variety of recorded or digitally
encoded predetermined different vehicle sounds.
an engine sound replication device that includes in memory at
least one recording of an engine or engine exhaust sound
produced by a predetermined vehicle, a computer that is able
to access the memory, means for determining the engine RPM
of a personal vehicle in Which the device is to be used, soft
60
Ware adapted to produce an output signal by modifying the
recording of an engine or engine exhaust sound, and Wherein
the output signal can be used to drive a speaker, either directly
or by passing the output signal to an ampli?er or a stereo
system prior to connection to the speaker, the output signal
65
being further controlled by the computer so as to correspond
With the engine speed of the personal vehicle, and Which
further includes means for selecting from memory the record
US 7,979,147 B1
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7
A thirteenth continuing object of the invention is to provide
ing of an engine or engine exhaust sound from a plurality of
an engine sound replication device that plugs into a poWer
recordings of engine or exhaust sounds produced by a plural
ity of different types of predetermined vehicles.
A ninth continuing object of the invention is to provide an
engine sound replication device that includes in memory at
outlet in a motor vehicle and obtains poWer from the poWer
least one recording of an engine or engine exhaust sound
outlet.
A fourteenth continuing object of the invention is to pro
vide an engine sound replication device that plugs into a
produced by a predetermined vehicle, a computer that is able
poWer outlet in a motor vehicle and Which is able to obtain a
to access the memory, means for determining the engine RPM
of a personal vehicle in Which the device is to be used, soft
signal that is representative of the real -time RPM of the
engine of the motor vehicle from the poWer outlet.
Ware adapted to produce an output signal by modifying the
recording of an engine or engine exhaust sound, and Wherein
an engine sound replication device that is able to transmit a
A ?fteenth continuing object of the invention is to provide
simulated (i.e., replicated) automobile sound to the stereo
system in a personal vehicle.
A sixteenth continuing object of the invention is to provide
the output signal can be used to drive a speaker, either directly
or by passing the output signal to an ampli?er or a stereo
system prior to connection to the speaker, the output signal
an engine sound replication device that is able to transmit a
being further controlled by the computer so as to correspond
simulated (i.e., replicated) automobile sound to speakers that
With the engine speed of the personal vehicle, and Which
are disposed in an exterior or other location of a personal
further includes means for adjusting the volume of sound
vehicle.
A seventeenth continuing object of the invention is to pro
vide an engine sound replication device that is able to obtain
engine data from an on-board computer of a personal vehicle
by electrical connection thereto, such as by connection to an
OBD H type of under dashboard connector, and Wherein the
device is able to utiliZe the data thus obtained to optimiZe the
replication of an engine or engine exhaust sound of a prede
termined automobile.
produced by the speaker.
A tenth continuing object of the invention is to provide an
engine sound replication device that includes in memory at
20
least one recording of an engine or engine exhaust sound
produced by a predetermined vehicle, a computer that is able
to access the memory, means for determining the engine RPM
of a personal vehicle in Which the device is to be used, soft
25
Ware adapted to produce an output signal by modifying the
recording of an engine or engine exhaust sound, and Wherein
An eighteenth continuing object of the invention is to pro
the output signal can be used to drive a speaker, either directly
or by passing the output signal to an ampli?er or a stereo
system prior to connection to the speaker, the output signal
being further controlled by the computer so as to correspond
With the engine speed of the personal vehicle, and Wherein the
speaker is disposed in an interior of the personal vehicle.
An eleventh continuing object of the invention is to provide
an engine sound replication device that includes in memory at
least one recording of an engine or engine exhaust sound
30
When the personal vehicle is accelerating, decelerating,
idling, moving, standing still, under heavy or light load, mov
35
produced by a predetermined vehicle, a computer that is able
to access the memory, means for determining the engine RPM
of a personal vehicle in Which the device is to be used, soft
40
Ware adapted to produce an output signal by modifying the
recording of an engine or engine exhaust sound, and Wherein
ing at a steady rate of speed, or changing gears and Wherein
the device is able to utiliZe the data thus obtained to better
replicate a sound of a predetermined automobile.
A nineteenth continuing object of the invention is to pro
vide an engine sound replication device that includes at least
one speaker that is disposed in an exterior of an automobile
and Wherein the speaker includes a shape that resembles the
shape of at least a portion of an automobile tailpipe.
A tWentieth continuing object of the invention is to provide
the output signal can be used to drive a speaker, either directly
or by passing the output signal to an ampli?er or a stereo
system prior to connection to the speaker, the output signal
vide an engine sound replication device that is able to obtain
engine data from an on-board computer of a personal vehicle
by electrical connection thereto, such as by connection to an
OBD H type of under dashboard connector, and Wherein the
device is able to utilize the data thus obtained to determine
45
an engine sound replication device that is able to vary the
audible sound produced by an automobile Without any modi
being further controlled by the computer so as to correspond
?cation to the stock (i.e., original) exhaust system of the
With the engine speed of the personal vehicle, and Wherein the
speaker is disposed in an exterior of the personal vehicle.
vehicle.
A tWelfth continuing object of the invention is to provide an
engine sound replication device that includes in memory at
least one recording of an engine or engine exhaust sound
produced by a predetermined vehicle, a computer that is able
50
licated sound as audio in a personal vehicle.
A tWenty-second continuing object of the invention to pro
to access the memory, means for determining the engine RPM
of a personal vehicle in Which the device is to be used, soft
Ware adapted to produce an output signal by modifying the
recording of an engine or engine exhaust sound, and Wherein
55
A tWenty-third continuing object of the invention to pro
system prior to connection to the speaker, the output signal
60
With the engine speed of the personal vehicle, and Wherein the
speaker is disposed in an interior of the personal vehicle and
including a second speaker, and Wherein the second speaker is
disposed in an exterior of the personal vehicle, and including
means for directing the output signal to either the speaker or
to the second speaker, or to both the speaker and the second
speaker simultaneously.
vide an engine sound replication device that can replicate the
engine or exhaust sound of a predetermined airplane and
output the replicated sound as audio in a personal vehicle.
vide an engine sound replication device that can replicate the
engine or exhaust sound of a predetermined automobile and
output the replicated sound as audio in a personal vehicle.
the output signal can be used to drive a speaker, either directly
or by passing the output signal to an ampli?er or a stereo
being further controlled by the computer so as to correspond
A tWenty-?rst continuing object of the invention is to pro
vide an engine sound replication device that can replicate the
exhaust sound of a predetermined engine and output the rep
A tWenty-fourth continuing object of the invention to pro
vide an engine sound replication device that can replicate the
engine or exhaust sound of a predetermined boat and output
the replicated sound as audio in a personal vehicle.
A tWenty-?fth continuing object of the invention to provide
65
an engine sound replication device that can replicate the
engine or exhaust sound of a predetermined motorcycle and
output the replicated sound as audio in a personal vehicle.
US 7,979,147 B1
9
10
A tWenty-sixth continuing object of the invention to pro
engine or related sounds may also be available in the library
vide an engine sound replication device that can replicate the
engine or exhaust sound of a predetermined truck and output
the replicated sound as audio in a personal vehicle.
for access and use, such as the sound produced by movement
of the internal and external component parts of the predeter
mined engine or by any of the component parts that are driven
A tWenty-seventh continuing object of the invention to
provide an engine sound replication device that can replicate
any of the sounds or noises produced by an engine and output
by the predetermined engine, including gear changes of the
the replicated sounds or noises as audio in a personal vehicle.
to a preferred embodiment the library includes a plurality of
transmission, and drive train noises (such as the sound of
moving drive shafts, universal joints, and the like).According
A tWenty-eighth continuing object of the invention to pro
recorded predetermined engine sounds in computer-readable
vide an engine sound replication device that can replicate the
sounds or noises produced by the transmission of an engine
form, and example thereof being the use of MIDI ?les. A
controller includes a computer and receives real time input
and output the replicated sounds or noises as audio in a
regarding the engine speed of the predetermined engine of a
personal vehicle in Which the engine sound replication device
personal vehicle.
A tWenty-ninth continuing object of the invention to pro
is to be used. The controller determines if the personal vehicle
is at idle, driving at a steady speed, accelerating, or deceler
ating. If gear change information is available the controller
vide an engine sound replication device that can replicate the
sounds or noises produced by any of the moving parts of an
engine, transmission, or drive train and output the replicated
sounds or noises as audio in a personal vehicle.
determines that as Well. The controller determines Which of
A thirtieth continuing object of the invention to provide an
engine sound replication device that can replicate the sounds
or noises produced by the transmission of an engine When a
gear shift change occurs and output the replicated sounds or
the plurality of recorded predetermined engine sounds is to be
replicated by user input selection. The controller then obtains
20
and utiliZes appropriate sampling patterns of engine and/or
exhaust sounds from the library that corresponds as close as
noises as audio in a personal vehicle.
A thirty-?rst continuing object of the invention to provide
an engine sound replication device that is able to replicate
25
engine and/ or exhaust sounds of a predetermined vehicle in a
possible With the engine RPM and operating characteristics
(i.e., accelerating, decelerating, or gear changes) of the per
sonal vehicle. An output signal is produced by the controller
that includes a Waveform of an exhaust or engine sound that is
personal vehicle through an audio system and thereby legally
suitable to drive a speaker or ampli?er. The speaker may be
avoid the restrictions as may be imposed by all laWs and
located in an interior of the automobile or at a preferred
regulations appertaining to exhaust systems, including muf
?ers, of automobiles.
A thirty-second continuing object of the invention to pro
location out of the interior of the automobile (i.e., at an
30
vide an engine sound replication device that is able to obtain
engine data from an on-board computer of a personal vehicle
by electrical connection thereto, such as by connection of an
OBD II transmitter to an OBD II type of under dashboard
connector, and Wherein the OBD II transmitter is able to
obtain and transmit the desired information to a stereo
35
receiver, ampli?er, or other device capable of receiving it
using any preferred transmission technology including
BLUETOOTHTM, RF, IR, or any other preferred method or
40
protocol.
ometer that is able to detect acceleration or deceleration of a
45
A thirty-fourth continuing object of the invention to pro
vide an engine sound replication device that is able to obtain
engine data from an on-board computer of a personal vehicle
by electrical connection thereto, such as by connection of an
OBD II transmitter to an OBD II type of under dashboard
connector, and Wherein the OBD II transmitter is able to
obtain and transmit the desired information to a diagnostic
tool as audio, and Wherein the audio information could be
used to assist diagnosis and repair of the vehicle.
Brie?y, an engine sound replication device that is con
structed in accordance With the principles of the present
other type of vehicle’s) engine at idle, during steady-state
operation at a predetermined speed, during acceleration, and
during deceleration. According to a preferred embodiment,
the exhaust sound is preferred and other computer-readable
vehicle as Well as additional details and optional capabilities
of the device are also disclosed including the use of BLUE
TOOTHTM and FM transmission to simplify installation and
connection to an OBD II type of under dashboard connector
to obtain desired engine data of the personal vehicle. Con
50
nection of an OBD II transmitter to an OBD II under dash
board connector is also disclosed Wherein the OBD II trans
mitter transmits via BLUETOOTHTM protocol the desired
55
engine data to a receiver that can include certain neW on board
stereo receivers or other devices that can function as a plat
form, such as an IPHONETM or an IPOD TOUCHTM, and
Wherein the IPHONETM or the IPOD TOUCHTM can produce
the desired engine replication sound that is synchroniZed to
the operating condition of the engine of the personal vehicle
invention has a library in some form of computer-readable
memory that includes the engine sound or the exhaust sound
of at least one predetermined engine therein. The predeter
mined engine sound can be that of any preferred automobile,
truck, motorcycle, airplane, boat, racecar, go kart, or other
motor vehicle. The exhaust or engine sound preferably
includes a sampling of the predetermined automobile’s (or
tion device a preferred listening level is obtained. A suf?cient
increase in volume provides an overall combined sound that
can be made to appear as if it is primarily that of the prede
termined engine or engine exhaust. In this manner, the per
sonal vehicle is made to sound like (i.e., to replicate) the
sound of any preferred predetermined type of vehicle. Various
novel Ways of deriving real-time engine data of the personal
A thirty-third continuing object of the invention to provide
an engine sound replication device that includes an acceler
vehicle in Which the device is installed.
exterior location), or both. The volume is preferably adjust
able. The driver (user) is able to select Which particular engine
and/or exhaust sound pattern is to be replicated. The sound
output of the engine sound replication device overlays the
ambient sounds that the personal vehicle produces or experi
ences. By adjusting the volume of the engine sound replica
and transmit the desired engine replication sound via PM to a
60
stereo receiver of the personal vehicle for playback.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagrammatic vieW of an engine sound
65
replication device.
FIG. 2 is a side vieW of a personal vehicle With the engine
sound replication device of FIG. 1 attached thereto.
US 7,979,147 B1
11
12
A preferred source of engine data 22 is obtained from the
12 VDC poWer outlet 22a, also knoWn as a cigarette lighter
outlet in older types of vehicles. The 12 VDC poWer outlet
22a is found in an interior of most types of the personal
vehicle 12.
The controller 14, according to a preferred embodiment,
plugs into the 12 VDC poWer outlet 22a and obtains the
necessary electrical poWer for operation of the engine sound
replication device 10 therefrom. Referring noW also to FIG. 3
and also to the teachings of Majstorovic et al., in Us. Pat.
Nos. 6,973,377 and 7,013,207, it is noted that an electrical
signal in the form of periodic electrical noise is modulated
onto the 12 VDC bus and therefore, the periodic electrical
noise is also present on the 12 VDC poWer outlet 22a.
The periodic electrical noise appears as electrical spikes, as
shoWn in general by the reference numeral 24, on the 12 VDC
poWer outlet 22a that occur Whenever any of the spark plugs
?re (not shoWn) in the personal vehicle 12. The rate of the
FIG. 3 is a Waveform of the 12 volt electrical bus (plus 12
VDC) of the personal vehicle of FIG. 2 When the engine is
running and also the Waveform of an intermediate pulse rep
resentation signal.
FIG. 4 is a high-level ?owchart of the software for a con
troller of the engine sound replication device of FIG. 1.
FIG. 5 is a block diagram of the engine sound replication
device of FIG. 1 connected to an OBD II connector.
FIG. 6 is a block diagram of an OBD II transmitter con
nected to an OBD II connector of the personal vehicle and a
consumer product that is used as a platform for the engine
sound replication device.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 and on occasion to FIG. 2 is shoWn, an
engine sound replication device, identi?ed in general by the
reference numeral 10.
The engine sound replication device 10 is intended for use
in a personal vehicle 12, automobile, or any other preferred
20
type of a motor vehicle.
As used herein the element “personal vehicle” is not lim
ited to only cars. The use of the term “vehicle” is intended to
include any type of a motor vehicle, such as a car, truck,
motorcycle, or other type of the personal vehicle 12. The
engine sound replication device 10 is used to change the
ambient sound of the personal vehicle 12 and to make it sound
25
as if it Were a different type of vehicle or poWered by a
different type of engine and/or transmission. This is described
in greater detail, hereinafter.
The engine sound replication device 10 includes a control
ler 14. The controller 14 includes a microcomputer, RAM,
ROM, softWare, ?rmWare, and circuitry as is Well knoWn in
the computer arts. The controller 14 is con?gured With cir
cuitry and softWare, as necessary, to receive input data (as is
identi?ed and described in greater detail hereinafter), utiliZe
30
spark plug ?ring is proportional to the speed (RPM) of the
engine 20.
The periodic electrical noise occurs because of electrical
induction and the sudden discharge of stored electrical energy
across the gap of each spark plug. This sudden discharge is
preceded by a surge in voltage across the spark plug gap and
a portion of this energy radiates outWard. By subsequent
induction and also to some degree by capacitance and back
EMF, it appears as periodic electrical spikes 24 throughout
the 12 VDC electrical bus and elseWhere in the personal
vehicle 12.
The controller 14 includes circuitry and softWare, as
desired, to strip (i.e., demodulate) the periodic electrical noise
(i.e., the spikes 24) and to produce an intermediate pulse
representation signal, identi?ed in general by the reference
numeral 26, in the form of an electrical Waveform (i.e., a pulse
35
pattern) that corresponds to When the spark plugs of the
the input data, and to produce an output signal 16. The output
personal vehicle 12 ?re. Circuitry and softWare in the con
troller 14 demodulate the periodic electrical spikes 24 and
signal 16 is also described in greater detail hereinafter as is the
convert them into the intermediate pulse representation signal
input data that is received by the controller 14.
It is necessary to supply real time engine data 18 as the
40
required input data to the controller 14. The real time engine
data 18 supplies information as to the state of an engine 20
(dashed lines) of the personal vehicle 12. At a minimum the
With su?icient computer processing (by the microcomputer
speed that the engine 20 is turning (RPM) is required for the
controller 14 to properly function. The reason for supplying
the controller 14 With RPM engine data from the personal
vehicle 12 is described in greater detail hereinafter.
The real time engine data 18 is obtained from any of a
variety of preferred sources of raW engine data, as shoWn in
45
general by reference numeral 22 (dashed lines). The source of
50
26.
A ?rst burst 24a of the periodic electrical spikes 24
raW engine data 22 can vary depending on Which type of a
on Which of the various sources of engine data 22 is preferred
for any given con?guration (i.e., model) of the engine sound
55
The raW engine data 22 includes, at a minimum, informa
tion useful to determine the speed (RPM) of the engine 20.
The raW engine data 22 can include a digital or analog indi
cation of actual speed (RPM) of the engine 20, such as from
a tachometer, or it can include data that relates to the speed of
60
the engine 20 and by analysis thereof can provide indication
of the speed of the engine 20. The raW engine data 22 (here
resentation signal 2611, second intermediate pulse representa
tion signal 26b, and third intermediate pulse representation
signal 260, respectively. The microcomputer includes a pre
cise internal clock and is therefore able to accurately deter
pulse representation signals 26.
information, such as the speed of the personal vehicle 12, the
tion under Which the personal vehicle 12 is being operated.
includes a ?rst time interval betWeen each spike 24. A second
burst 24b of the periodic electrical spikes 24 includes a sec
ond time interval betWeen each spike 24. The second time
interval is greater than the ?rst time interval. A third burst 240
of the periodic electrical spikes 24 includes a third time inter
val betWeen each spike 24. The third time interval is less than
the ?rst time interval.
The ?rst burst 2411, second burst 24b, and third burst 240 are
each converted into a respective ?rst intermediate pulse rep
mine an actual time interval betWeen any of the intermediate
inafter referred to as “engine data 22”) can also include other
gear its transmission is in, When a gear change is occurring, or
any other type of information that is indicative of the condi
of the controller 14) are included, as required, to ensure that
the periodic electrical spikes 24 are detected and are properly
converted into the intermediate pulse representation signal
vehicle is used for the personal vehicle 12 and also depending
replication device 10.
26 that the microcomputer of the controller 14 can use by the
use of band-pass ?lters and demodulation circuitry, as is Well
knoWn in the electrical arts.
The electrical Waveform, as shoWn, is a simpli?cation of
that Which can be observed. Additional ?lter circuitry along
65
It can be determined from these three Waveform patterns
that the engine 20 is turning at the sloWest rate (in RPM) for
the time duration of the second burst 24b and that it is turning
US 7,979,147 B1
13
14
at the fastest rate for the time duration of the third burst 240,
however the exact rate of revolutions of the engine 20 (i.e., the
The on-board computer of the personal vehicle 12 moni
tors and regulates operation of the engine 20 to one degree or
RPM) cannot be determined by the microcomputer Without
another. Some of the information available to the on-board
additional information supplied to the controller 14.
The additional information that is required is the number of
computer of the personal vehicle 12 or Which is provided by
the on-board computer may be available on the OED II. The
under dashboard connector 22b, therefore, alloWs the control
cylinders of the engine 20 of the personal vehicle 12. A
cylinder input sWitch 28 is set to indicate the number of
cylinders of the engine 20 in the personal vehicle 12. Four,
ler 14 to have direct access With any of the data present on the
OED II and also to a limited extent With the on-board com
puter of the vehicle 12.
The under dashboard connector 22b thereby may include
information on engine RPM (directly), the gear that the trans
mission of the engine 20 is in, When a change in gears is
occurring (i.e., When the transmission, either manual or auto
six, and eight are the more common number of cylinders.
However, some vehicles may have as little as one, tWo, or
three cylinders or as many as tWelve.
As desired, any input that is user-selectable and Which is
supplied to the controller 14 may include a physical sWitch to
accomplish the selection process or the input parameter may
be entered or set by any other preferred manner, for example,
matic is being shifted from one gear to another, either to a
higher or loWer gear ratio), and the speed of the personal
vehicle 12.
This data can be especially useful to optimally enhance the
by a menu selection off of a touch-sensitive or other type of a
display. The display can be included as an option With the
engine sound replication device 10, as desired. It is to be
understood that various models of the engine sound replica
tion device 10 are anticipated With a corresponding variation
performance of the engine sound replication device 10 and is
described in greater detail hereinafter. Of course, the engine
20
in pricing and features.
fore the under dashboard connector 22b is not limited to the
OED II type of connector.
A second alternate source of the engine data 18 for the
Once the controller 14 is supplied With the number of
cylinders of the engine 20 it can convert the varying interme
diate pulse representation signals 26 into RPM data for the
engine 20. This is because the number of spark plug ?rings
per revolution (or ?rings per set of revolutions) of the engine
20 corresponds With the number of cylinders that the engine
20 has.
The most common type of engine 20 used in the personal
25
positive indication of When the particular spark plug ?res
(that the sparkplug connection 220 is directly connected to) is
30
35
engine that is used can be optionally included as another
sonal vehicle 12.
A ?rst alternate source of the engine data 18 for the con
troller 14 is supplied by connection to an under dashboard
connector 22b. The under dashboard connector 22b is
40
45
that is purchased as desired and to Which the controller 14 is
connected.
In a similar manner When direct spark plug connection 220
is used to supply the engine data 18, a device (not shoWn) is
provided and is attached inside the engine compartment to
one of the spark plugs. This device is expected to be an
50
accessory item that is purchased separately. The direct spark
plug connection 220 is useful if the personal vehicle 12 does
not have a 12 VDC poWer outlet, or if the periodic electrical
spikes 24 are for any reason especially di?icult to detect, or if
there is no under dashboard connector 22b available for use.
55
A variation of the direct spark plug connection 220 is by
direct coil attachment. It is possible to determine, again by
voltage detection or by induction, When the coil (an inductor)
releases stored energy that is used to ?re any of the spark
plugs.
60
A third alternate source of the engine data 18 for the con
troller 14 is supplied by a radio antenna connection 22d. A
radio antenna of the personal vehicle 12 is identi?ed by the
reference numeral 23. The radio antenna connection 22d
65
manner similar to that as previously described, the electrical
engine sound replication device 10.
A corresponding electrical connector or adapter having
any desired shape and pin-con?guration is provided, as
desired, for use With the engine sound replication device 10
10 and Which receives information (i.e., data) on the rate of
?ring of the sparkplug (if a hard Wire type of connection is not
used) and supplies that information in a desired format that is
acceptable to the controller 14. The receiver may be included
as part of the controller 14 or it may be an accessory device
knoWn as an “on board diagnostic” or “OBD”. A current
standard includes a protocol knoWn as “OBD II” and it is
required for placement on light trucks and cars Within one
meter of the steering Wheel. While some of the connections
and therefore data in the OED II are de?ned, automobile
manufacturers have a certain degree of latitude in the data and
con?guration of the OED II connectors for their model
vehicles. Information regarding this standard can be found on
the Internet.
If a source of poWer (i.e., 12 VDC) is available from the
OED II connector, it is preferably used to supply poWer to the
stroke), the RPM of the engine 20 can be calculated.
When direct connection to the spark plug occurs, the output
is either connected to the controller 14 by Wire or it is trans
mitted to the controller 14 by any preferred manner (RF,
BLUETOOTHTM, or other format). A receiver (not shoWn) is
optionally included With the engine sound replication device
included With most neW model vehicles and it includes con
nection to an on-board computer for the personal vehicle 12.
A common type of the under dashboard connector 22b is
obtained. This can be determined by electrical detection of
the voltage spike or by an induction coil that is placed around
any of the spark plug Wires. Again, knoWing the number of
cylinders (and the type of engine 20, Whether tWo or four
lication device 10 is to be used With a tWo-stroke type of
user-selectable input for a particular version of the engine
sound replication device 10.
It is to be noted that, When the engine sound replication
device 10 is in operation, the controller 14 is constantly deter
mining RPM and changes in RPM. Increasing RPM is asso
ciated With acceleration of the personal vehicle 12 and
decreasing RPM is associated With deceleration of the per
controller is supplied by direct spark plug connection 220 to
any one of the spark plugs of the engine 20. In this manner, a
vehicle 12 is of the four-stroke variety. The RPM of the engine
20 is calculated by the controller 14 With the default being for
a four-stroke type of the engine 20. If the engine sound rep
engine (not shoWn), then the type of internal combustion
sound replication device 10 can utiliZe any existing or neW
(i .e., future) connector protocol including Wireless, and there
includes an electrical connection to the radio antenna 23. In a
that mates With the under dashboard connector 22b of any
Waveform present on the radio antenna 23 is supplied through
particular type of the personal vehicle 12.
the radio antenna connection 22d and is demodulated to
US 7,979,147 B1
15
16
obtain the periodic electrical spikes 24, Which are then con
verted into a modi?ed type of intermediate pulse representa
mined automobile preferably include a recording of the
tion signal (similar to the pulse representation signal 26), and
mobile.
In a basic version of the engine sound replication device 10
it is possible to record the exhaust sound at a single speed. The
single speed may be at idle or at some other desired speed of
exhaust sound that is produced by the predetermined auto
Which is ultimately converted by the controller 14 into RPM
data.
The controller 14 is constantly obtaining and using the
engine data 18 signal (i.e., information) supplied to it to
operation of the engine in the predetermined automobile. The
controller 14 Would then obtain from the memory library 30
determine the RPM of the engine 20. It also compares present
RPM With past RPM and based on the rate of change that may
be occurring determines if the personal vehicle 12 is acceler
ating, decelerating, and at What rate it is doing so. It also can
determine if the vehicle 12 is being driven at a steady rate of
and thereafter adjust the single speed exhaust sound of the
predetermined automobile based on a softWare program to
reproduce (i.e., to replicate) the sound of the predetermined
automobile over a range of engine speeds and to output the
replicated exhaust sound as the output signal 16 of the con
troller 14.
speed.
If the RPM is constant and is at an idle speed, the controller
14 can determine that the personal vehicle 12 is at idle. If the
RPM is constant at a speed above idle, the controller 14 can
determine that the personal vehicle 12 is driving at a steady
speed doWn the road. If the controller 14 is also receiving data
from the on-board computer of the personal vehicle 12 by
connection to the under dashboard connector 22b, it may be
able to tell What gear the transmission of the personal vehicle
12 is in and When a gear change is occurring.
If the controller 14 observes the points of gear change that
are occurring it can compare that With engine speed data as
It is especially important to note that the output signal 16
includes a Waveform (analog or digital, as preferred) that is
20
12.
Comparable does not mean equal. Different engines turn at
different speeds. The maximum safe speed is often referred to
25
Well. For example, if the engine speed is accelerating quickly
30
may be at 4,000 RPM Whereas the other may be at 8,000
RPM.
For example, assume that the predetermined vehicle
35
includes the exhaust sound of a vintage large displacement
eight cylinder car or truck engine that has a red-line of 4,000
RPM. Assume that the personal vehicle 12 has a higher speed
small displacement four cylinder engine that includes a red
line of 8,000 RPM.
is accelerating rapidly.
mation affects the engine and exhaust sound that the personal
vehicle 12 (or any other vehicle produces) and is useful in
optimiZing performance of the engine sound replication
device 10, as is described in greater detail hereinafter.
The engine sound replication device 10 also includes a
library in some form of computer-readable memory, herein
after referred to as a memory library 30, Which includes the
engine or exhaust sound of at least one predetermined vehicle
(not shoWn). The predetermined vehicle can include any auto
mobile, truck, boat, airplane, race car, go kart, or other type of
40
When the engine sound replication device 10 is properly
con?gured, if the personal vehicle 12 is operating at it’s
redline (i.e., 8,000 RPM), the output signal 16 Will include the
exhaust sound of the predetermined automobile When the
predetermined automobile’ s engine is turning at 4,000 RPM.
This is accomplished by the controller obtaining from the
memory library 30 a ?le of the predetermined automobile
engine’s exhaust sound recorded at its red line or, alternately,
recorded at the highest available rate (RPM). If the highest
45
recorded rate is less than the red line of the engine of the
a motor vehicle as may be desired.
For the folloWing description, the predetermined vehicle is
assumed to be a predetermined automobile (not shoWn).
HoWever, the folloWing description is also generally appli
predetermined automobile, the controller 14 compresses the
highest available rate (RPM) recorded ?le Which, in turn,
shortens the apparent time betWeen spark plug ?rings of the
cable for use With other types of vehicles that may be used as
the predetermined vehicle.
The sound of the engine and/or exhaust of the predeter
mined automobile are stored as ?les in the memory library 30.
as the engine’s “red line”, a speed not to be exceeded. The red
line of the personal vehicle 12 may be more or less than the
red line of the engine of the predetermined automobile. One
While the gears are changing from a loWer gear to a higher
gear, the controller can determine that the personal vehicle 12
If there is a sudden acceleration accompanied by a drop in
gears, the controller 14 can determine that the personal
vehicle 12 is being used to pass someone. All of this infor
representative of the engine sound of the predetermined auto
mobile and that the output signal 16 is alWays adjusted so that
the engine speed of the replicated exhaust sound (i.e., the
speed of the engine of the predetermined automobile) is com
parable With the speed of the engine 20 of the personal vehicle
engine of the predetermined automobile so as to replicate the
50
predetermined automobile engine operating at its red line
They may be MIDI ?les or they may be stored or encoded by
(i.e., 4000 RPM).
any desired format. The only requirement is that they be
If the personal vehicle 12 is operating at 4,000 RPM
(midrange), the output signal 16 Will include the exhaust
sound of the predetermined vehicle When the predetermined
accessible to the controller 14 for use on demand.
Preferably, the ?les include the recorded sounds of the
engine and/ or exhaust of the predetermined automobile. In
this manner they Will accurately represent the sound pro
duced by the predetermined automobile. The ?les in the
memory library 30 can also include sounds of gear changes by
55
the transmission of the predetermined automobile as Well as
other engine compartment or drive train sounds. While it is
60
preferred that the engine sounds are actually recorded, and
therefore highly realistic, it is possible to include synthesiZed
Waveform ?les of the engine and/or exhaust sounds of the
predetermined automobile in the memory library 30.
The folloWing description focuses on exhaust sound,
although other engine and/or transmission sounds may also
be used. The ?le(s) in the memory library 30 of the predeter
vehicle’s engine is turning at approximately 2,000 RPM (i.e.,
at or about its midrange). To accomplish this, the controller 14
obtains from the memory library 30 a recorded ?le of the
exhaust sound of the predetermined automobile operating at
2000 RPM or the ?le that is closest to 2000 RPM and adjusts
it (either increases or decreases the apparent speed of the
engine of the predetermined automobile) so that it is equal to
2000 RPM.
It is important to note that the recorded ?les of exhaust
sound in the memory library 30 are of relatively short dura
65
tion. These ?les are merely repeated (i.e., sampled and
obtained again and again from the memory library 30) so as to
provide the controller 14 With a continuous stream of engine
US 7,979,147 B1
17
18
sounds (exhaust or other) from the memory library 30 that
correspond always With the current state of the engine 20 in
the personal vehicle 12.
In this manner, the output signal 16 is continuous Whenever
the engine 20 is running. The output signal 16 is made up of
back to back segments (i.e., ?les) of the recorded sounds
stored in the memory library 30. These segments vary
speeds and during different conditions. For example, the
exhaust sound of the predetermined automobile is preferably
recorded at idle, mid-range, and at high RPM, during accel
depending on changes in real time that occur With the per
sonal vehicle 12.
also included in the memory library 30, as desired.
Similarly, the typical exhaust sound at idle speed (or the
closest ?le thereto) of the engine of the predetermined auto
variant of the exhaust (and/ or engine) sound of the predeter
eration and deceleration. It is also preferable to record the
exhaust sound of the predetermined automobile during heavy
acceleration and heavy deceleration. Other engine sounds
(like engine compartment noise and gear change noise) are
In this manner, the controller 14 is able to use Whichever
mined automobile that most closely corresponds to the man
ner in Which the personal vehicle 12 is being operated at that
moment. Whichever variant of the predetermined automo
mobile that is stored in the memory library 30 Will be used as
the output signal 16 When the engine 20 of the personal
vehicle 12 is at idle speed.
If the predetermined automobile had a higher red-line than
that of the personal vehicle 12, the output signal 16 Will be
proportionally correlated in a similar manner except that the
RPM value of the output signal 16 Will be at a proportionally
higher RPM than that Which the engine 20 of the personal
vehicle 12 is revolving.
In this manner, the engine sound replication device 10 is
able to provide the output signal 16 that is proportionally
correlated With the speed of the engine 20 of the personal
vehicle 12 as compared With an equivalent engine speed of the
predetermined vehicle. As the output signal 16 represents the
20
any given moment in time.
The output signal 16 may also include a combined sound
that is derived by tWo or more ?les stored in the memory
library 30, and Which are both supplied simultaneously (or
25
exhaust (and/or engine) sound of the predetermined vehicle,
the engine sound replication device 10 is able to replicate the
exhaust (and/or engine) sound of the predetermined vehicle
and to overlay the replicated sound With the normal ambient
sounds of the personal vehicle 12. This is described in greater
bile’s exhaust (and/or engine) sound is used by the controller
14, that signal is adjusted for the RPM of the personal vehicle
12 and is outputted accordingly, as the output signal 16. This
greatly improves realism of the replicated exhaust sound. It is
to be understood that the output signal 16 is the replicated
sound of the predetermined automobile, adjusted to match the
speed and condition of operation of the personal vehicle 12 at
nearly so) to the controller 14. An example Would be if the
controller 14 is aWare that the personal vehicle 12 is operating
at, say a midrange RPM, and is experiencing a gear change
from a loWer to a higher gear. If available, the controller
Would simultaneously obtain and use a ?le from the memory
30
library of the engine of the predetermined vehicle (automo
detail hereinafter.
For the moment, it is important to note that the correlation
bile) operating at its midrange RPM and also of the recorded
provided by the engine sound replication device 10 provides
riencing a gear change from a loWer gear to a higher gear.
In this manner, a highly realistic composite sound Wave
for a realistic sound. By Way of contrast, if the personal
vehicle 12 Was traveling at a loW, steady speed and an exhaust
sound of an accelerating predetermined automobile Was
sound produced by the predetermined vehicle When it is expe
35
form is provided as the output signal 16. The audible result is
that, to the driver of the personal vehicle 12, it appears as
though the sound of the predetermined vehicle’ s transmission
as it increases gears, matches perfectly With the gear change
of the personal vehicle 12 and that the predetermined auto
40
mobile’s engine sounds (i.e., exhaust or other engine sounds)
also match perfectly With the operation of the personal
instead incorrectly superimposed, the resultant combined
sound Would be unrealistic and, therefore, undesirable.
If desired, the controller 14 may include another user
selectable input that is for the make and model input 32 of the
personal vehicle 12. The make and model input 32 is used to
inform the controller 14 as to the make and model the per
sonal vehicle 12. This information is stored in memory as
vehicle 12.
make and model ?les (RAM, ROM, external memory, or
additional ?les stored in the memory library 30) and is acces
breaks) and especially realistic. As soon as the controller 14
This results in the output signal 16 being seamless (i.e., no
45
sible to the controller 14. The make and model ?les are used
to inform the controller as to What is the maximum RPM (i.e.,
the red line) of the personal vehicle 12. The make and model
?les also preferably include red line information about the
predetermined vehicle. The controller 14 is then able to pro
portionally correlate the tWo red-line values, thereby auto
50
desired (Which may be faster or sloWer than the engine 20 of
the personal vehicle is turning) is again obtained from the
matically and optimally matching the respective engine
memory library 30 and is used. If desired, any of the ?les
obtained from the memory library can be stored in any form
(i.e., as intermediate ?les) in a memory cache (RAM) that
speeds betWeen the predetermined vehicle and the personal
vehicle.
If a particular version of the engine sound replication
device 10 includes the make and model input 32 capability, it
determines that the personal vehicle 12 has completed its gear
change, then the ?le of recorded sound produced by the
predetermined vehicle When it is experiencing a gear change
is no longer used by the controller 14. HoWever, the ?le
closest to the speed of the predetermined automobile that is
55
may be provided on the controller 14 to permit faster access.
may not be necessary to use, or in some instances to even
If desired, all of the ?les appertaining to the selected type of
the predetermined vehicle may be stored in the cache during
include, the cylinder input sWitch 28. This is because the
operation of the engine sound replication device 10.
make and model input 32 informs the controller 14 as to What
type of personal vehicle 12 the engine sound replication
device 10 is being used in, and the information about the
personal vehicle 12 that is stored in memory (RAM, ROM,
external memory, or memory library 30) Will preferably
include information on the number of cylinders in the engine
20 of the personal vehicle 12.
It is preferable that the memory library 3 0 include recorded
exhaust sounds of the predetermined automobile at different
It is important to note that the controller 14 can utiliZe as
60
many ?les from the memory library 30 (or stored in cache) as
may be desired simultaneously. It has previously been
described hoW a gear change ?le of the predetermined auto
mobile can be used simultaneously With a recorded ?le of the
65
engine speed of the predetermined automobile to create a
composite sound Waveform as the output signal. Files of the
predetermined vehicle during acceleration, deceleration,
engine compartment noise, cockpit noise, drive train noise,
US 7,979,147 B1
19
20
and others may be combined in any desired Way to further
loWer the volume control 36 so that the volume of the repli
enhance the composite sound Waveform, and thereby
improve realism of the replicated sound. If the predetermined
could be, if desired, the sound of the propeller turning.
cated exhaust is Within permissible levels.
The output signal 16 can be used in various Ways to audibly
produce the replicated exhaust sound, a feW of Which are
discussed herein.
As mentioned above, it is also preferable that the memory
library 30 include the recorded exhaust sounds of a plurality
of the predetermined vehicles or automobiles, and it is further
The output signal 16 can be Wired directly 16a to a stereo
system in the personal vehicle 12. In this case the volume on
the stereo can be used to control the volume of the replicated
vehicle is an airplane, one of the ?les in the memory library 30
exhaust sound that is emitted by stereo speakers 38. The
stereo speakers 38 are disposed in an interior (i.e., in the
preferred that the plurality of different types of the predeter
mined vehicles or automobiles include additional exhaust
cockpit) of the personal vehicle 12.
and/ or engine sound recordings taken at different engine
Altemately, the output signal 16 can be transmitted 16b to
speeds and during different operating conditions for the dif
ferent predetermined automobiles.
By having a plurality of recorded exhaust and/or engine
sounds for a plurality of different types of the predetermined
automobile stored in the memory library 30, the engine sound
replication device 10 provides for an unexpected and valuable
bene?t that is vastly different than could occur With any
factory exhaust system or after-market exhaust system.
The driver of the personal vehicle 12 is able to vary another
user-selectable input and to make a selection of the type of the
predetermined vehicle 34 that is to be replicated from those
available in the memory library 30. In this manner, any of the
plurality of recorded exhaust and/ or engine sounds from
Which of the plurality of different types of the predetermined
automobiles is obtained after selection and is used by the
controller 14 as previously described, and outputted as the
the stereo system by RF (such as on an FM frequency) or
BLUETOOTHTM or by any other desired method. In this case,
the engine sound replication device 10 Would include an RF
(PM) or BLUETOOTHTM or other type of transmitter that
continually transmits the output signal 16.
If the vehicle’ s stereo system is tuned to the appropriate RF
(i.e., FM) frequency, and if the output signal 16 is being
20
25
output signal 16.
In this manner, by the ?ick of a sWitch or by selection from
a menu of possible choices appearing on the display of the
transmitted via PM, the transmitted signal Will be absorbed by
the radio antenna 23. The stereo system Will receive the FM
form of the output signal 16 from the radio antenna 23 Which
30
Will be a modulated signal along With the carrier frequency. In
normal fashion, the stereo Will strip off the audio portion of
the RF (or BLUETOOTHTM or other received signal) and
output the audio portion to the stereo speakers 38.
The advantage of RF (FM), BLUETOOTHTM, or other
transmission of the output signal 16 to the stereo is that
minimal Wiring is required. For many applications, the engine
sound replication device 10 need only be plugged into the 12
VDC poWer outlet 22a. No other electrical connections are
controller 14, the driver can instantly change the output signal
required. The stereo Will then output the replicated exhaust
16 from one type of replicated vehicle to another type. In one
moment, the personal vehicle 12 can be made to sound like a
vintage muscle car. By selection, the next moment it can
sound like a truck or like a high-performance racing automo
bile.
sound to the stereo speakers 38. The driver is able to use the
stereo for its normal purposes such as listening to PM, AM,
satellite (if so equipped), cassette When desired and can,
instead, use the stereo to produce the replicated exhaust
sounds When desired by tuning it to the appropriate PM or
BLUETOOTHTM input source.
Once the engine sound replication device 10 has been
installed in the personal vehicle 12, the driver (i.e., user) can
instantly select from any of the various exhaust sounds of the
various different types of the predetermined automobiles that
35
40
substantially affecting others, such as pedestrians. Instead,
the driver and occupants of the personal vehicle 12 are able to
customiZe and tailor the engine sounds that they hear so as to
make the personal vehicle 12 appear to sound as any other
are stored in the memory library 30. No additional modi?ca
tion is required to change the Way the personal vehicle 12
sounds.
It is, of course, possible to include as many of the different
recorded exhaust and/or engine sounds in the memory library
30 as is desired. It is also possible to sell or otherWise provide
additional memory (30a, dashed lines) of other or exotic
sounding exhaust sounds either in the form of attachable
memory cards (i.e. ROM chips) or to doWnload (such as from
the Internet) additional exhaust and/ or engine sounds. In this
45
type of the predetermined automobile.
50
engine sound replication device 10, it Will maximize their
enjoyment of the engine sound replication device 10 if the
exhaust sounds that others (i.e., pedestrians, those in other
vehicles) hear Was that Which is produced by the engine sound
replication device 1 0 and not that Which is normally produced
by the personal vehicle 12.
To accomplish this, an auxiliary audio ampli?er 40 may be
55
replication device 10. The auxiliary audio ampli?er 40 is
HoWever, it is also expected that for many users of the
manner, the customiZing of exhaust and/or engine sound that
is produced by the engine sound replication device 10 is
possible, possibly at extra cost. Certain people Who Would
like to have their personal vehicle 12 sound different or spe
cial are likely to pay a premium to replicate unique or exotic
includes as a part (or as an option) of the engine sound
either connected by Wire to the output signal 16 or it can
include a separate ampli?er receiver that receives and utiliZes
exhaust sound patterns.
If desired, the engine sound replication device 10 includes
a volume control 36. The volume control 36 is used to vary
and thereby to control the amplitude of the output signal 16.
60
the audio content of the output signal 16 if the output signal is
transmitted (via RF, BLUETOOTHTM, or other). The auxil
iary audio ampli?er 40 includes a speaker output that is con
nected to at least one auxiliary speaker 42. The auxiliary
speaker 42 may be in an interior of the personal vehicle 12 or,
preferably, it is of Weatherproof design and is located at an
exterior location, attached to the personal vehicle 12.
In this manner the volume of the replicated exhaust sound can
be controlled.
For example, if the driver of the personal vehicle 12 is not
on a public road and Wishes to increase the volume of the
replicated exhaust sound so that it exceeds legal street limits,
the driver merely raises the volume control 36 When desired.
Prior to again entering a public road, the driver Would ?rst
The stereo speakers 38 being in the interior of the personal
vehicle 12 permit listening to the replicated exhaust Without
65
A preferred shape for the auxiliary speaker 42 is to include
a cylindrical or conical shape that replicates the shape of most
common types of exhaust tailpipes. A preferred location for
US 7,979,147 B1
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22
placement of the auxiliary speaker 42 is to the rear of the
personal vehicle 12 at a lower location proximate Where the
to a limited degree, What it feels like to drive a vintage auto
mobile or a high-performance race car or a poWerful (high
actual exhaust system (i.e., the exhaust tailpipe) of the engine
20 is/are disposed.
horsepoWer) muscle car. The sound that these vehicles pro
duce is an important aspect that contributes to the “feel” of
If the personal vehicle 12 includes a dual exhaust system, it
is desirable to include tWo of the conical shaped auxiliary
speakers 42, each one disposed adjacent to one of the
driving them.
Furthermore, the driver can experience this for different
types of the predetermined vehicle merely by making a sWitch
(or menu) selection and thereby replicating the sound of a
tailpipes. This position provides especially realistic sound
distribution to those outside of the vehicle. It can also signi?
different one of the predetermined vehicle engine and/or
exhaust sounds that are stored in the memory library 30.
In this manner, an ordinary type of the personal vehicle 12
can be made to sound like any other type of a vehicle (i.e., any
cantly enhance the appearance of the vehicle.
For example, if the personal vehicle 12 includes only one
exhaust pipe (i.e., if it is a single-exhaust vehicle), the use of
tWo of the conical shaped auxiliary speakers 42 that are both
disposed in a spaced-apart relationship With respect to each
type of the predetermined vehicle). If the personal vehicle 12
is a common type of a car, it can be made to sound like any
other at a loWer elevation and to the rear of the personal
other type of automobile, racecar, truck, motorcycle, or even
vehicle 12 can create the illusory appearance that the personal
vehicle 12 has a dual exhaust system. The appearance is
further reinforced by the sound that emanates from the tWo
like an airplane or boat.
conical shaped auxiliary speakers 42 When the vehicle 12 is
running and the engine sound replication device 10 is acti
In summary, the output signal 16 includes a preferred form
of the replicated sound of the preferred predetermined vehicle
and that sound is heard by the driver and occupants of the
20
vated (i.e., turned on).
If desired, the auxiliary speaker 42 may include a fairly
limited frequency response range because the exhaust sounds
orboth. If desired, tWo of the auxiliary speakers 42 are used to
replicate a dual-exhaust system. In the draWing (FIG. 2) the
second auxiliary speaker 42 is disposed behind the one shoWn
that are being replicated may be narroW and in some instances
may predominantly include base frequencies. In a similar
manner, the auxiliary ampli?er 40 may include any desired
personal vehicle by audio output of the output signal 16
through the stereo speakers 38 or the auxiliary speaker(s) 42,
25
frequency range and/or poWer output capability.
and is therefore not visible.
Referring noW to FIG. 4 is shoWn a high-level ?owchart
that describes basic operation and one possible con?guration
of the softWare for the microcomputer that is used to control
Another user-selectable input that can be included is for an
internal or external speaker selection sWitch 44. The internal
or external speaker selection sWitch 44 preferably includes
three positions. A ?rst position is for activation of the interior
stereo speakers 38 only. A second position is for activation of
the exterior auxiliary speaker 42 only. A third position is for
activation of both the interior stereo speakers 38 and also the
30
exterior auxiliary speaker 42.
35
operation of the engine sound replication device 10.
The engine sound replication device 10 also provides a
further unexpected bene?t in that the controller 14 is continu
ally obtaining information on the state of the engine 20 of the
It is also possible to directly connect by Wire an output of
the stereo of the personal vehicle 12 in certain situations to the
personal vehicle 12 and that information can be used to pro
vide a diagnostic bene?t.
When engine data 22 is obtained from the 12 VDC poWer
outlet 22a or by direct spark plug connection 220 to any one
of the spark plugs (or coil) of the engine 20 or to the radio
auxiliary speaker 42, thereby eliminating the need for the
antenna 23, the controller is able to determine and, as desired,
analyZe the electrical spikes 24 that are obtained. In this Way,
auxiliary ampli?er 40. It is desirable to include an additional
driver-selectable sWitch that can turn on or off the auxiliary 40 the quality of the ?ring of the spark plugs can be observed.
speaker 42 if the stereo does not already include one.
It is also important to note that the output signal 16 can go
to a single speaker (i.e., to only one of the stereo speakers 38
This is an essential parameter that contributes to optimum
or to only one of the auxiliary speakers 42). In this mode, the
output signal 16 is monophonic.Altemately, the output signal
45
performance of the engine 20. The manner by Which the
Waveform of the electrical spikes 24 affects the capabilities of
the engine 20 can be compared to the Way that the Waveform
of an electrocardiogram reveals the performance capabilities
16 can be used to drive (either directly if the controller 14 has
of a human heart.
an ampli?er included as a part thereof) or the stereo system or
The engine sound replication device 10 can include a diag
nostic mode that can either be set by user-selectable input or,
auxiliary ampli?er 40 can be used to drive a pair of speakers
to produce stereophonic replication of the exhaust and/or
engine sounds of the predetermined vehicle. If desired, the
50
memory library 30 can include a monophonic or stereophonic
recording of the exhaust and/ or engine sounds of the prede
termined vehicle (or vehicles).
If desired, the recorded exhaust and/ or engine sounds in the
memory library 3 0 can also include sounds that are emanating
if desired, can alWays operate in a background mode and,
When a potential problem is detected, alert the driver by any
preferred type of Warning, such as by the presentation of
engine performance data on the display screen of the engine
sound replication device 10, an audible and/or visual Warning
light, etc. The ability of the engine sound replication device
from or in the engine compartment of the predetermined
10 to diagnose performance of the engine 20 can occur at idle,
at speed, and under acceleration or deceleration, thereby pro
automobile or even those sounds Which can be heard in the
viding useful diagnostic information.
cockpit (i.e., interior) of the predetermined automobile. In
When engine data 22 is obtained from the under dashboard
connector 22b (i.e., the OED II type of connector) the engine
this manner the replicated exhaust sounds of the predeter
mined vehicle that are replicated in the personal vehicle 12
and Which are heard through the stereo speakers 38 or through
55
60
sound replication device 10 can utiliZe all available param
eters of engine data in a manner similar to that Which cur
the auxiliary speaker 42 (or pair of auxiliary speakers 42) can
rently available automotive diagnostic tools that rely upon
be made even more realistic and representative of the actual
sounds that are heard in the predetermined vehicle.
connection to the OED II connector presently diagnose
The engine sound replication device 10 can provide the
driver With a realistic simulated experience of driving the
predetermined vehicle. In this Way, the driver can experience,
engine condition, including obtaining any “engine codes”
65
that may be stored in the on-board computer of the personal
vehicle 12 or in any storage media (i.e. RAM) associated With
the on-board computer. The engine sound replication device
US 7,979,147 B1
23
24
100 can even be con?gured to clear the “engine codes”, as
mechanics Wireless relay is commonly used by mechanics to
desired and to analyze any of the engine data that is available
on the OED ll connector (or other type of connector) and to
present the results of analysis and data obtained to the driver
for vieWing, for example, on the display screen of the engine
sound replication device 10, if so equipped.
In this manner, a preferred hi gher-end version of the engine
sound replication device 10 can also be used to perform
diagnostic procedures on the state of the engine 20 of the
personal vehicle 12 or, if desired, to any otherpersonal type of
vehicle (not shoWn) to Which it is temporarily connected. This
connect to the OED ll connector 22b and to transmit OBD 11
engine data using BLUETOOTHTM technology and protocol
to an engine analyZer to assist in the diagnosis and servicing
of engines. The mechanics Wireless relay may be usable as it
is or, if desired, it can be modi?ed to more favorably transmit
only the desired data from the OED ll connector 22b and
provide the OED ll transmitter 106.
The advantage of the OED ll transmitter 106 is that a
simple plugging in of the OED ll transmitter 106 into the
OED ll connector 22b provides the desired data from the
engine of the personal vehicle 12 Without the need for any
Wiring. This saves time and simpli?es the installation process.
The second device includes a commercially available plat
capability is useful and is expected to appeal to professional
and home mechanics, alike.
Referring noW to FIG. 5 is shoWn a block diagram of the
engine sound replication device 10 connected to the OED 11
under dash connector 22b. This draWing shoWs the basic Ways
of con?guring the engine sound replication device 10 not
form 110. The platform 110 is a device that includes a micro
processor and su?icient ram and non-volatile memory to
anticipated by the prior art. The output signal 16 (of FIG. 1) as
device 10. Ideally, softWare can be loaded into the platform
110 so that it is able to function as the engine sound replica
tion device 10.
This can potentially loWer the cost of the engine sound
replication device 10 by a signi?cant degree for those con
shoWn includes a Wired 100 output that is Wired to either the
stereo system in the personal vehicle 12 or to the auxiliary
implement the functionality of the engine sound replication
20
audio ampli?er 40. The stereo system outputs a signal to drive
the speakers of the personal vehicle 12 that the stereo is
connected to for real time playback of the replicated engine
sound. The auxiliary audio ampli?er 40 similarly drives aux
iliary speakers 42 that are located either in the personal
sumers Who already oWn the platform 110. For a modest
investment they can obtain the OED ll transmitter 106 and
25
doWnload the softWare for the platform 110. Using the stereo
vehicle 12 or external to it. If the auxiliary speakers 42 are
in the personal vehicle 12 a very loW cost Way to enjoy the
external, preferably they are mounted proximate the exhaust
tailpipe(s), as previously described.
engine sound replication device 10 is provided. Additionally,
Altemately, the output signal 16 includes an FM Wireless
output 102. The PM Wireless output 102 transmits the output
signal 16 as an FM radio frequency that the stereo system in
the personal vehicle 12 is tuned to and able to receive.
most consumers can install and use this con?guration of the
30
A third basic con?guration includes a BLUETOOTHTM
output 104 that transmits the output signal 16 using BLUE
TOOTHTM technology and protocol. Certain of the neWer
A preferred consumer device for use as the platform 110
includes either the IPHONETM or the IPOD TOUCHTM that
35
are manufactured by APPLETM computers. Assuming that the
40
IPHONETM is used as the platform 110, a cradle 112 is also
purchased by the user. The cradle 112 is a commercially
available product that plugs into the 12 VDC poWer outlet of
the personal vehicle 12 for electrical poWer. The cradle 112
connects electrically With the IPHONETM and maintains its
electrical charge during use. The cradle 112 also includes the
ability to output an audio output signal from the IPHONETM
by Wireless FM broadcast.
The user Who oWns the IPHONETM is likely to already have
versions of the stereo system in the personal vehicle 12 are
able to receive this signal and, as described above, drive the
personal vehicle’s 12 stereo speakers to produce the repli
cated engine sound. It is also possible for auxiliary audio
ampli?er 40 to receive the BLUETOOTHTM signal and drive
the auxiliary speakers 42.
If desired, a different Wireless protocol such as that of
802.11 and often referred to as “WiFi” can be used instead of
or in addition to the BLUETOOTHTM protocol. The 802.11
communication standard re?ects an industry communication
standard and is commonly used for Wireless communication
45
the cradle 112 because the IPHONETM can be used to store
50
music ?les (i.e., songs) forplayback. The cradle 112 is used to
output the songs being played by the IPHONE TM via the FM
Wireless output 102 (i.e., by Way of FM broadcast) for recep
tion by the stereo system of the personal vehicle 12 and for
playback through the personal vehicle’ s speakers. This alloWs
With laptop computers, for example. To simplify remaining
discussion, it is to be understood that Whenever BLUE
TOOTHTM is mentioned herein, that 802.11 (WiFi) or any
other desired, similar or different Wireless protocol can be
used, either alone or in combination With any other Wireless
the user to listen to songs from the IPHONETM While driving.
When the IPHONETM has been doWnloaded With the nec
protocol standard.
essary softWare to replicate the functionality of the engine
sound replication device 10 it is placed in the cradle 112. The
Referring noW to FIG. 6 is shoWn a block diagram of the
engine sound replication device 10 con?gured to obtain the
engine data of the personal vehicle 12 from the under the dash
55
OBD ll connector 22b using a commercially available ?rst
device to extract the desired engine data from the OED ll
connector and another commercially available second device
to act as a “platform” to implement the functionality of the
controller 14, memory library 32, and other component parts
of the engine sound replication device 10.
IPHONETM is enabled to run the softWare and replicate the
engine sound replication device 10. The stereo is tuned to
receive an FM signal on the same FM frequency that the
cradle 112 transmits the output signal 16 (of the IPHONETM)
on.
60
The OBD ll transmitter 106 is installed into the OED ll
connector 22b. When the engine 20 of the personal vehicle 12
The ?rst device includes an OBD ll transmitter 106 that
obtains the OED II data and transmits it using BLUE
TOOTHTM technology and protocol as a Wireless BLUE
TOOTHTM OBD II data transmission signal 108. The OBD ll
transmitter 106 is a commercially available product that is
commonly referred to as a “mechanics Wireless relay”. The
engine sound replication device 10 Without the need for out
side technical assistance, thereby saving even more. If outside
help is required, the time and therefore the cost should be
minimal.
65
is started, the engine data is broadcast using BLUETOOTHTM
technology and protocol and received by the IPHONETM. The
IPHONETM, functioning as the engine sound replication
device 10, combines the engine sounds of the predetermined
vehicle (i.e., Whatever type of engine sound is to be repli
cated) from memory library 30, processes the engine sounds
US 7,979,147 B1
25
26
of the predetermined vehicle to match the RPM and the actual
acceleration or deceleration of the engine 20 of the personal
The invention has been shoWn, described, and illustrated in
substantial detail With reference to the presently preferred
embodiment. It Will be understood by those skilled in this art
that other and further changes and modi?cations may be
made Without departing from the spirit and scope of the
invention Which is de?ned by the claims appended hereto.
vehicle 12 (using the OED II data) and outputs the output
signal 16 to the cradle 112. The cradle 112 broadcasts the
output signal 16 via PM and the stereo captures it and plays
the replicated engine sound over the stereo. The user adjusts
the volume on the stereo to suit.
When the engine 20 is turned off the OED ll transmitter
106 stops transmitting data and the stereo becomes silent
(assuming the stereo still has poWer).
The platform 110 (IPHONETM) can be doWnloaded With
the softWare by a USB computer connection. APPLETM
could, if desired, provide this service for a fee. Similarly, the
various engine sounds in the memory library 30 can be
updated or exotic sounds added, again preferably for a fee.
What is claimed is:
1. An engine sound replication device, comprising:
(a) a ?le containing a sound from an engine of a predeter
mined vehicle that is readable by a computer, and
Wherein said ?le containing a sound from an engine of a
predetermined vehicle is stored in a memory library;
(b) means for determining information regarding at least
some aspect of a present state of an engine of a personal
vehicle Wherein said means for determining includes an
electrical connection to an OBD H type of connector and
Altemately, a detachable memory card can be inserted in or
removed from the platform 110 for softWare or memory
library 30 storage and updates.
Information and speci?cations regarding the OED ll con
nector can be found on the lntemet and is provided by the
20
“Society of Automotive Engineers”.
connector Wherein said present state includes data
regarding the number of revolutions per minute that said
engine of said personal vehicle is operating at or data as
It is also noted that the IPHONETM includes an accelerom
eter 110a therein. As desired, the softWare of platform 110
to Which gear a transmission of said personal vehicle is
can be modi?ed to also use an output of the accelerometer
11011 or any remote accelerometer (not shoWn) that the plat
form 110 or any other embodiment of the engine sound rep
25
30
In addition to acceleration or deceleration data, the con
said personal vehicle to correspond With said data
regarding the number of revolutions per minute that said
engine of said personal vehicle is operating at or to
35
40
additional operating parameters or states regarding the engine
45
said content of said memory is selected depending on
said load of said engine of said personal vehicle, and
If desired, other transducers useful in monitoring (i.e.,
Wherein said controller is able to adjust said content of
50
55
said ?le containing a sound from an engine of said predeter
60
The use of any and all desired parameter or state data that
is timely supplied to the controller 14 is used by the controller
14 to modify, vary, and adjust the output signal 16 so that it
better correlates With the actual state or operating condition of
rience.
2. The engine sound replication device of claim 1 Wherein
said ?le containing a sound from an engine of said predeter
mined vehicle includes a plurality of ?les containing a plu
rality of sounds of said engine of said predetermined vehicle.
3. The engine sound replication device of claim 1 Wherein
and vacuum are all potentially desirable parameters or states
the engine 20 of the personal vehicle 12 at any given time,
thereby improving both realism and enjoyment of the expe
said memory library to provide an adjusted output signal
that optimally correlates With said load of said engine of
said personal vehicle, and Wherein said output signal
includes said adjusted output signal.
decreasing in overall gear ratio, acceleration, deceleration,
of the engine of the personal vehicle 12 to monitor and to
communicate in real time (i.e., as close as possible to real
time) to the controller 14.
aspect of a present state of an engine includes a current
load of said engine of said personal vehicle, and Wherein
OED ll connector.
manual or automatic transmissions and Whether increasing or
Wherein said engine sound replication device includes a
controller, and Wherein said controller includes a micro
computer, and Wherein a content of said memory library
is accessible to said controller, and Wherein said means
for determining information regarding at least some
by extrapolation and comparison of data available from the
detecting) any desired parameter or state of the engine of the
personal vehicle 12 can be optionally included and connected
to the engine sound replication device 10 for use by the
controller 14. For example, information about the RPM, load,
transmission gear ratio, When changing from one transmis
sion gear ratio to another transmission gear ratio for either
correspond With said data as to Which gear said trans
mission of said personal vehicle is disposed in; and
(d) an output signal, said output signal including a replica
tion of said engine sound of said predetermined vehicle,
Wherein said output signal includes an ampli?er, and
troller 14 (for all embodiments) is preferably supplied With
of the personal vehicle. Some of the desired parameters or
states can be obtained directly off the pins of the OED li
connector, While others can be determined or approximated
device is operating;
(c) modifying said ?le of an engine sound to correspond in
a desired Way With said present state of said engine of
present state of operation of the engine of the personal vehicle
12. The resultant output signal 1 6 Will better correlate With the
state of the engine of the personal vehicle 12. Therefore, the
replicated engine sound that is being produced Will seem
much more realistic because it Will better correlate (i.e., by
altering the output signal 16) With the actual state of the
engine of the personal vehicle 12.
disposed in, and Wherein said extraction of data regard
ing said present state of said engine of said personal
vehicle occurs continuously through said OBD H type of
connector Whenever said engine sound replication
lication device 10 may be connected to also obtain data
regarding acceleration and deceleration of the personal
vehicle 12 in Which the platform 110 is disposed.
The acceleration or deceleration data supplied to the plat
form 110 is used by the controller 14 to vary or alter the output
signal 16 so that the output signal 16 better correlates to the
the extraction of data regarding said present state of said
engine of said personal vehicle from said OBD H type of
65
mined vehicle includes an exhaust sound.
4. The engine sound replication device of claim 1 Wherein
said ?le containing a sound from an engine of said predeter
mined vehicle includes an engine compartment sound.
5. The engine sound replication device of claim 1 Wherein
said ?le containing a sound from an engine of said predeter
mined vehicle includes a gear change by a transmission of
said predetermined vehicle.
US 7,979,l47 B1
27
28
6. The engine sound replication device of claim 1 Wherein
said ?le containing a sound from an engine of said predeter
mined vehicle includes drive train sound of said predeter
22. The engine sound replication device of claim 1 Wherein
said ?le containing said sound from said engine of said pre
determined vehicle includes a synthesiZed representation of
mined vehicle.
said sound.
23. The engine sound replication device of claim 1 Wherein
said means for determining information regarding at least
some aspect of a present state of said engine of said personal
vehicle includes generating a diagnosis of saidpresent state of
said engine of said personal vehicle, and includes an indica
tion of said diagnosis of said present state of said engine of
7. The engine sound replication device of claim 1 Wherein
said output signal is continuously provided Whenever said
engine of said personal vehicle is operating.
8. The engine sound replication device of claim 1 including
means for providing said output signal as an input signal to
said ampli?er, stereo system, or speaker for playback as an
said personal vehicle.
24. The engine sound replication device of claim 1 Wherein
audio replication of said engine sound of said predetermined
vehicle.
said means for determining information regarding at least
some aspect of a present state of said engine of said personal
9. The engine sound replication device of claim 8 Wherein
said output signal includes electrical connection through a
vehicle includes an OBD 11 Wireless transmitter that is con
Wire.
nected to said OBD ll connector, and Wherein said OBD 11
Wireless transmitter provides a Wireless OBD II data trans
10. The engine sound replication device of claim 8 Wherein
said output signal includes means for transmitting said output
signal to a receiver.
11. The engine sound replication device of claim 10
20
Wherein said receiver includes a stereo receiver.
BLUETOOTHTM protocol.
12. The engine sound replication device of claim 10
Wherein said receiver is electrically connected to an auxiliary
25. The engine sound replication device of claim 24 includ
ing a commercially available device as an operating platform,
ampli?er.
13. The engine sound replication device of claim 8 Wherein
said speaker is disposed in an interior of said personal vehicle.
14. The engine sound replication device of claim 8 Wherein
said speaker is disposed at an exterior of said personal
vehicle.
15. The engine sound replication device of claim 14
Wherein said speaker is disposed under a rear of said personal
vehicle.
16. The engine sound replication device of claim 15
Wherein said speaker includes a generally cylindrical or coni
cal shape that resembles at least a portion of a tailpipe in
25
suf?cient to emulate or otherWise replicate the functionality
platform is able to receive said Wireless OBD II data trans
30
signal to produce said output signal.
26. The engine sound replication device of claim 25
Wherein said platform includes an IPHONETM or an IPOD
TOUCHTM.
mined vehicle includes a sound from an engine selected from
40
boat, airplane, racecar, and go-kart.
output signal that optimally correlates With said RPM of said
engine of said personal vehicle, and Wherein said output
mission signal and Wherein said modifying said ?le of said
engine sound to correspond in a desired Way With said present
state of said engine of said personal vehicle includes said
platform altering a state of said engine sound to correspond
With said present state of said engine of said personal vehicle
that is obtained from said Wireless OBD II data transmission
35
17. The engine sound replication device of claim 1 Wherein
said ?le containing a sound from an engine of said predeter
18. The engine sound replication device of claim 1 Wherein
said means for determining information regarding at least
some aspect of a present state of said engine of said personal
vehicle includes a current RPM of said engine of said per
sonal vehicle, and Wherein said content of said memory is
selected depending on said RPM of said engine of said per
sonal vehicle, and Wherein said controller is able to adjust
said content of said memory library to provide said adjusted
and Wherein said platform includes softWare and circuitry
of said engine sound replication device, and Wherein said
appearance.
the group consisting of an automobile, motorcycle, truck,
mission signal of said present state of said engine of said
personal vehicle When said engine of said personal vehicle is
running, and Wherein said Wireless OBD II data transmission
signal includes a Wireless signal that is compatible With
27. The engine sound replication device of claim 25 includ
ing a cradle, and Wherein said platform is adapted to connect
to said cradle and Wherein said cradle is adapted to receive
said output signal from said platform, and Wherein said cradle
includes a transmitter for transmitting said output signal via
an FM broadcast.
45
28. The engine sound replication device of claim 1 Wherein
said means for determining information regarding at least
some aspect of a present state of said engine of said personal
vehicle includes selection of at least one operating parameter
or state of said engine of said personal vehicle from the group
50
consisting of RPM, load, transmission gear ratio, changing
from one transmission gear ratio to another transmission gear
signal includes said adjusted output signal.
ratio, acceleration, deceleration, and vacuum, and Wherein
19. The engine sound replication device of claim 18
Wherein said memory library includes a plurality of ?les, each
of said plurality of ?les containing said sound from said
engine of saidpredetermined vehicle, and Wherein any of said
plurality of ?les is selected from the group consisting of an
engine compartment sound, a transmission sound, a gear
change sound, an exhaust sound, and a cockpit sound of said
said content of said memory is selected depending on said at
least one operating parameter or state of said engine of said
predetermined vehicle.
20. The engine sound replication device of claim 19
Wherein said controller is able to simultaneously select and
combine any of said plurality of ?les to produce a composite
sound Waveform as said output signal.
21. The engine sound replication device of claim 1 Wherein
said ?le containing said sound from said engine of said pre
determined vehicle includes a recording of said sound.
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personal vehicle, and Wherein said controller is able to adjust
said content of said memory library to provide said adjusted
output signal that optimally correlates With said at least one
operating parameter or state of said engine of said personal
vehicle, and Wherein said output signal includes said adjusted
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output signal.
29. The engine sound replication device of claim 1 Wherein
said ?le containing said sound from said engine of said pre
determined vehicle is selected from said memory library by
said controller, and Wherein said means for determining infor
65
mation regarding at least some aspect of a present state of said
engine of said personal vehicle includes selection of at least
one operating parameter or state of said engine of said per
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