null  null
US 20140376725A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2014/0376725 A1
Trammell
(54)
(43) Pub. Date:
SOUND ENHANCEMENT FOR POWERED
SPEAKERS
(52)
Dec. 25, 2014
US. Cl.
CPC .................................... .. G10L 19/26 (2013.01)
USPC
.......................................................... ..
381/17
(71) Applicant: Lloyd Trammell, Thousand Oaks, CA
(Us )
(72) Inventor:
_
(73)
Lloyd Trammell’ Thousand oaks, CA
(57)
ABSTRACT
A process and system for enhancing and customizing sound
includes receiving an input audio sound and enhancing the
(Us)
voice audio input in two or more harmonic and dynamic
_
_
ranges by re-synthesiZing the audio into a full range PCM
ASSlgnee' Max sound corporatlon’ La Jona’ CA
(Us)
_
section for adjusting a mid frequency tone, a third section for
(21) Appl' NO" 14/185’850
.
(22)
adjusting a high frequency tone and mixing the audio outputs
_
Flled'
processed by the ?rst, second and third sections to produce an
Feb' 20’ 2014
output audio sound. The enhancement includes the parallel
_
(60)
wave. A tone adjusting circuit is provided which includes a
?rst section for adjusting a low frequency tone, a second
_
processing the input audio via a low pass ?lter with dynamic
Related U'S'Apphcatlon Data
Provisional application No. 61/767,200, ?led on Feb.
20, 2013.
Publication Classi?cation
offset, an envelope controlled bandpass ?lter, a high pass
?lter, adding an amount of dynamic synthesized sub bass to
the audio and combining the four treated audio signals in a
summing mixer with the original audio. The low frequency
tone has a frequency of 100 HZ and a bandwidth of 0.5. The
mid frequency tone has a frequency of 2500 HZ and an adjust
(51)
Int. Cl.
G10L 19/26
able bandwidth and the high frequency tone has a frequency
of 10 KHZ and an adjustable bandwidth.
(2006.01)
Stereo Audio
Stereo
Input
Processor
100
110
WAT
120
Stereo Am plifier/
Speakers
Patent Application Publication
Dec. 25, 2014 Sheet 1 0f 3
US 2014/0376725 A1
Patent Application Publication
Dec. 25, 2014 Sheet 2 0f3
US 2014/0376725 A1
Figu re 2
200
f
Stereo Audio
50
In
I- — — —
I :
_
—
—
—
—
—
—
+
210 \I'
—I—>
EXPAND
.
I
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,
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SPACE
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,
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SPACE Ec
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231__-I_’
—
—
I
.
270
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I
>
I
a.
|
I
;
SPARKLE
.
HPFC
:
SPARKLE
TUBE
THRESHOLD
l :
I
SPARKLE TUBE
BOOST
I
I
5
g
;
=
>
_ _ _ _ _ _ _|
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SUB BASS
;
I
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—
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— — —|
K260
Stereguéudio
Patent Application Publication
Dec. 25, 2014 Sheet 3 0f 3
US 2014/0376725 A1
Figure 3
Stereo Audio In
\300
‘:\310
LOW
“\340
%20
MID
\350
"\370
Stereo Audio Out
i,\330
HIGH
"\360
US 2014/0376725 A1
SOUND ENHANCEMENT FOR POWERED
SPEAKERS
Dec. 25, 2014
mid- and high-frequency drivers share an ampli?er channel
the output of which is split by a passive 2-way crossover7.
7 See, n.1, above
CROSS-REFERENCE TO RELATED PATENT
APPLICATIONS
[0001]
Embodiments of the present invention relate to US.
Provisional Application Ser. No. 61/767,200, ?led Feb. 20,
2013, entitled “SPEAKERS”, the contents of which are
incorporated by reference herein and which is a basis for a
[0009] Speakers are often used in low cost systems with
low cost components. These components affect the quality of
sound produced by the system. There is a need for an appli
cation that addresses the above de?ciencies of existing sys
tems that can enhance the received audio.
SUMMARY OF THE INVENTION
claim of priority.
BACKGROUND OF THE INVENTION
[0002] Powered speakers, also known as self-powered
speakers and active speakers, are loudspeakers that have
built-in ampli?ers. They can be connected directly to a mix
ing console or other low-level audio signal source without the
need for an external ampli?er. Active speakers may have
greater ?delity, less intermediations distortion (IMD), higher
dynamic range and greater output sound pressure level (SPL)
with fewer blown drivers. Disadvantages include heavier
loudspeaker enclosures, reduced reliability due to active elec
tronic components within, and the need of a source of elec
trical power (other than the audio signal).1
1 http ://en.wikipedia.org/wiki/Poweredispeakers
[0003] Powered speakers are available with passive or
active crossovers built into them. Active speakers with inter
nal active crossovers are widely seen in sound reinforcement
applications and in studio monitors. Home theater and add-on
domestic/ automotive subwoofers have used active powered
speaker technology since the late 1980s.2
2 See, n.1, above
[0004]
The terms “powered” and “active” have been used
interchangeably in regard to loudspeaker designs, however, a
differentiation may be made between the terms3:
3 See, n.1, above
[0005] In a passive loudspeaker system the low-level
audio signal is ?rst ampli?ed by an external power
ampli?er before being sent to the loudspeaker where the
signal is split by a passive crossover into the appropriate
frequency ranges before being sent to the individual
drivers. This design is common in home audio as well as
professional concert audio4.
[0010] The inventive process and system for enhancing and
customiZing sound includes receiving an input audio sound
and enhancing the voice audio input in two or more harmonic
and dynamic ranges by re-synthesiZing the audio into a full
range PCM wave. A tone adjusting circuit is provided which
includes a ?rst section for adjusting a low frequency tone, a
second section for adjusting a mid frequency tone, a third
section for adjusting a high frequency tone and mixing the
audio outputs processed by the ?rst, second and third sections
to produce an enhanced output audio sound.
[0011] The inventive audio enhancement process includes
the parallel processing the input audio via a low pass ?lter
with dynamic offset, an envelope controlled bandpass ?lter, a
high pass ?lter, adding an amount of dynamic synthesized sub
bass to the audio and combining the four treated audio signals
in a summing mixer with the original audio. The low fre
quency tone has a frequency of 100 HZ and a bandwidth of
0.5. The mid frequency tone has a frequency of 2500 HZ and
an adjustable bandwidth and the high frequency tone has a
frequency of 10 KHZ and an adjustable bandwidth.
[0012] A particular and speci?c powered speaker would
need to be measured, or analyzed, for its response character
istics to get an accurate representation of that speaker before
the Max Sound process.After this analysis, the same or dupli
cate speaker analysis is performed on the output after the
complete Max Sound process in the same speaker. This
allows the manufacturer to adjust the settings for optimiZing
the response characteristics to a “target, or more desirable
sound. Both of these measurements are performed by the
manufacturer. As noted herein, the inventive WAT process is
a user setting that is adjustable to allow the user to ?ne tune
the sound to their preference.
4 See, n.1, above
[0006]
BRIEF DESCRIPTION OF THE DRAWINGS
A powered loudspeaker works the same way as a
passive speaker but the power ampli?er is built into the loud
speaker enclosure. This design is common in compact per
sonal speakers such as those used to amplify portable digital
music devices5 .
[0013] FIG. 1 is a block diagram of an embodiment of the
audio process of the present invention.
[0014] FIG. 2 shows a typical use/implementation of the
inventive Stereo Processor according to an embodiment of the
5 See, n.1, above
present invention.
[0007] In a fully active loudspeaker system each driver has
its own dedicated power ampli?er. The low-level audio signal
[0015] FIG. 3 shows a ?ow chart of the inventive Wave
Adjustment Tool according to an embodiment of the present
invention.
is ?rst sent through an active crossover to split the audio
signal into the appropriate frequency ranges before being sent
to the power ampli?ers and then on to the drivers. This design
is commonly seen in studio monitors and professional concert
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENT(S)
audio6.
6 See, n.1, above
[0016]
[0008]
includes two stages, a Stereo Processing module and a tone
Hybrid active designs exist such as having three
The inventive process of the present application
drivers powered by two internal ampli?ers. In this case, an
adjustment module (WAT). Implementing the inventive pro
active 2-way crossover splits the audio signal, usually into
low frequencies and mid-high frequencies. The low-fre
cess into any speakers, results in an increase in the harmonic
quency driver is driven by its own ampli?er channel while the
and dynamic range of these speakers. Since the process is
dynamic in its control method, it also eliminates many of the
US 2014/0376725 A1
Dec. 25, 2014
phase anomalies that occur in normal unprocessed speakers.
there is a change at the input, the same change will occur at the
This will make them more ef?cient and much clearer sound
ing with the same hardware.
frequency for this ?lter is, e. g., 20 to 20 k hertz, which
[0017] In one embodiment, the stereo speakers in which the
inventive process is implemented are powered and have a
processor for processing the inventive processes built into
them. In one embodiment, the audio input is provided by an
external device, such as a CD or MP3 player. When the audio
is input into this device there is typically an input level control
that controls the gain or volume of the entire unit. The audio
path is, e.g., as shown in FIG. 1 with the audio ending at the
transducers or speakers for user listening.
[0018] Following the processing of the audio input by the
stereo processor module, the processed sound is fed to the
inventive Wave Adjustment Tool (WAT), which includes con
trols available for the user to adjust the tonality of the audio to
his/her liking. For e.g., the controls are LOW, MID, and
HIGH. These controls can be located on one side of the
speaker unit. The tone control is an improvement over the
conventional tone adjustments in part because it is based on a
dynamic approach that monitors the content of the received
audio and adjusts itself to compensate for any changes in both
a positive and negative direction. The end result is very pleas
ing and a more natural sound of the content being played. The
WAT is not limited only three bands. More dynamic bands
may be added as desired by programming them into the
process and assigning the frequency, band width, and amount
output regardless of either positive or negative amounts. The
corresponds to a full range. In one embodiment, the purpose
of EXPAND 310 is to “warm up” or provide a fuller sound as
waveform 100 passes through it. The original audio 200
passes through, and is added to the effected sound for its
output. As the input amount varies, so does the phase of this
section. This applies to all ?lters used in this software appli
cation. Preferably all ?lters are of the Butterwlo type.
[0023]
Next, we discuss SPACE 220. SPACE 220 refers to
the block of three modules identi?ed by reference numerals
221, 222 and 223. The ?rst module SPACE 221iwhich
follows EXPAND 210 envelope follower, sets the ?nal level
of this module. This is the effected signal only, without the
original. SPACE ENV FOLLOWER 222 tracks the input
amount and forces the output level of this section to match.
SPACE EC 223 sets the center frequency of the 4 pole digital
high pass ?lter used in this section. This ?lter also changes
phase as does EXPAND 210.
[0024] SPACE blocks 220 are followed by the SPARKLE
230 blocks. Like SPACE 220, there are several components to
SPARKLE. SPARKLE HPFC 231 is a 2 pole high pass ?lter
with a preboost which sets the lower frequency limit of this
?lter. Anything above this setting passes through the ?lter
while anything below is discarded or stopped from passing.
SPARKLE TUBE THRESH 232 sets the lower level at which
of dynamic change to be allowed per band. In this case it is a
the tube simulator begins working. As the input increases, so
digital process, but it may be hardware (analog) if desired in
does the amount of the tube sound. The tube sound adds
harmonics, compression and a slight bit of distortion to the
input audio 200. This amount increases slightly as the input
any output format (mono, stereo, 5.1, 7,1, etc.)
[0019]
The details of the present invention will now be
further explained by reference to the drawings.
[0020] Referring to FIG. 1, stereo audio input 100 is audio
form a powered speaker. The powered speaker is measured, or
level increases. SPARKLE TUBE BOOST 233 sets the ?nal
level of the output of this module. This is the effected signal
only, without the original.
analyzed, for its response characteristics to get an accurate
[0025]
representation of that speaker prior to subjecting its output to
the Max Sound process (not shown). The same speaker analy
module takes the input signal and uses a low pass ?lter to set
the upper frequency limit to about lOOHZ. An octave divider
sis is performed on the output after the complete Max Sound
process in the same speaker (not shown). This allows the
manufacturer to adjust the settings for optimiZing the
occurs in the software that changes the input signal to lower
by an octave (12 semi tones) and output to the only control in
response characteristics to a “target, or more desirable sound.
effected signal only, without the original.
Both of these measurements are performed by the manufac
[0026] Outputs from the above modules 210 to 240 are
directed into SUMMING MIXER 250 which combines the
audio. The levels going into the summing mixer 250 are
turer.
[0021] Audio input 100 is fed to the inventive Stereo Pro
cessor 110 for processing. The processing results in an
increase in the harmonic and dynamic range of these speak
ers. Since the process is dynamic in its control method, it also
eliminates many of the phase anomalies that occur in normal
unprocessed speakers. This will make them more ef?cient
and much clearer sounding with the same hardware. Sound
processed by the inventive Stereo Processor 110 is fed to the
inventive WAT (Wave Adjustment Tool) 120, which includes
controls available for the user to adjust the tonality of the
audio to user’s liking, and is then outputted to the speakers
130.
[0022] Further details of the inventive Stereo Processor will
now be described with reference to FIG. 2. Stereo Audio input
200 is processed, in parallel, by several module as follows.
EXPAND 210 is preferably a 4 pole digital low pass ?lter with
an envelope follower for dynamic offset (?xed envelope fol
lower). This allows the output of the ?lter to be dynamically
controlled so that the output level is equal to whatever the
input is to this ?lter section. For e. g., if the level at the input is
—6 dB, then the output will match that. Moreover, whenever
Next, the SUB BASS 240 module is discussed. This
the interface, which is the level or the ?nal amount. This is the
controlled by the various outputs of the modules listed above.
As they all combine with the original signal 200 fed through
the DRY 260 module there is interaction in phase, time and
frequencies that occur dynamically. These changes all com
bine to create a very pleasing audio experience for the listener
in the form of “enhanced” audio content. For example, a
change in a single module can have a great affect on what
happens in relation to the other modules ?nal sound or the
?nal harmonic output of the entire software application.
[0027] Continuing with reference to FIG. 3, output from the
Stereo Processor of FIG. 2 is received for further processing
by the Wave Adjustment Tool of the present invention for tone
adjustment. Input audio 300 is processed in parallel by the
three sections of the WAT tone adjusting circuit, which
include the LOW 310, MID 320 and HIGH 330 sections. The
audio processed by the three sections (shown by reference
numerals 340, 350 and 360 in FIG. 2) are then mixed to form
output audio 370.
[0028] According to one embodiment of the present inven
tion the LOW section has a frequency of 100 HZ and a 0.5
US 2014/0376725 A1
bandwidth; MID has a frequency of 2500 HZ with an adjust
able bandwidth; and HIGH has a 10 kHZ frequency and an
adjustable bandwidth.
[0029] For MID, the center frequency is dynamically
moved in both positive and negative amounts according to the
input level of this bandpass ?lter. Preferably, the range is from
1.7 kHZ on the low end to 4.5 kHZ on the upper end with 2.5
kHZ as the center or nominal setting. As the input level goes
positive or negative, so the bandwidth will change. For a
negative change the bandwidth will increase, for e. g., to a 0.5,
while a positive change will decrease, for e.g., to a 0.1. This
Dec. 25, 2014
A tone adjusting circuit, comprising;
A ?rst section for adjusting a low frequency tone;
A second section for adjusting a mid frequency tone;
A third section for adjusting a high frequency tone;
Mixing the audio outputs processed by the ?rst, second and
third sections to produce an output audio sound.
2. The process of claim 1, wherein the enhancement
includes the parallel processing the input audio as follows:
A module that is a low pass ?lter with dynamic offset;
provides a larger frequency change for negative and a smaller,
An envelope controlled bandpass ?lter;
A high pass ?lter;
more precise change for positive level amounts in the ?ltered
Adding an amount of dynamic synthesized sub bass to the
audio content.
[0030] In reference to the HIGH tone control section the
center frequency is ?xed, e. g., at 10 kHZ, but the bandwidth
changes dynamically in positive amounts as the input level
changes. For negative amounts the bandwidth stays at, e.g.,
0.5, when the level decreases the bandwidth goes only to a
max bandwidth of e.g., 0.3.
What is claimed is:
1. A process and system for enhancing and customiZing
sound comprising:
Receiving an input audio sound;
Enhancing the voice audio input in two or more harmonic
and dynamic ranges by re-synthesiZing the audio into a
full range PCM wave;
audio;
Combining the four treated audio signals in a summing
mixer with the original audio.
3. The process of claim 2, wherein the low frequency tone
has a frequency of 100 HZ and a bandwidth of 0.5.
4. The process of claim 2, wherein the mid frequency tone
has a frequency of 2500 HZ and an adjustable bandwidth.
5. The process of claim 2, wherein the i high frequency tone
has a frequency of 10 KHZ and an adjustable bandwidth.
6. The process of claim 2, wherein the input audio sound is
processed for a determination of its response characteristics
prior to being processed by the enhancing step.
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