System and method for automatically adjusting the sound and visual

System and method for automatically adjusting the sound and visual
US 20020136414A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2002/0136414 A1
(43) Pub. Date:
Jordan et al.
(54)
SYSTEM AND METHOD FOR
AUTOMATICALLY ADJUSTING THE SOUND
AND VISUAL PARAMETERS OF A HOME
THEATRE SYSTEM
(76) Inventors: Richard J. Jordan, Simi Valley, CA
(US); Omar M. Ahmad, Glendale, CA
(52)
Sep. 26, 2002
US. Cl. ................ .. 381/58; 381/59; 381/18; 381/77
(57)
ABSTRACT
(Us)
Correspondence Address:
The present invention is to provide a system and method for
setting various acoustic and visual parameters for optimal or
OPPENHEIMER WOLFF & DONNELLY LLP
Suite 3800
encoded audio and for optimal or intended reproduction of
2029 Century Park East
Los Angeles, CA 90067 (US)
intended reproduction of digital multi-channel surround
a visual image from a display device in a home theater
system. For example, one feature of the present invention is
to incorporate a hand-held remote control device Which
(21) Appl. No.:
09/813,722
(22) Filed:
Mar. 21, 2001
operates the main surround sound unit (e.g., home theater
receiver and/or digital decoder) and the display device via
electromagnetic link, for example. Of course, it is not
necessary to the invention that the device be incorporated in
the remote control device of the surround sound unit, or the
Publication Classi?cation
(51)
Int. Cl.7 ............................. .. H04R 5/00; H04B 3/00
display device.
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Sep. 26, 2002
US 2002/0136414 A1
SYSTEM AND METHOD FOR AUTOMATICALLY
ADJUSTING THE SOUND AND VISUAL
PARAMETERS OF A HOME THEATRE SYSTEM
optimal or intended reproduction of a visual image from a
display device. For example, one feature of the present
invention is to incorporate a hand-held remote control
device Which operates the main surround sound unit (e.g.,
BACKGROUND OF THE INVENTION
[0001]
1. Field of the Invention:
[0002] This invention relates generally to a system and
method for remotely adjusting acoustic and visual param
eters for home theatre systems including a surround sound
audio system and or a visual display device. Particularly, this
invention relates to a system and method of properly setting
up and aligning sound ?elds for accurate reproduction of
digital multi channel surround sound encoded audio and
properly setting up visual parameters in a display device.
[0003]
2. General Background and State of the Art:
[0004]
Some features of adjusting acoustic parameters are
home theatre receiver and/or digital decoder) and the display
device via electromagnetic link, for example. Of course, it is
not necessary to the invention that the device be incorpo
rated in the remote control device of the surround sound
unit, or the display device.
[0008]
In one embodiment of the present invention, a
device may include a sensor or a plurality of sensors capable
of detecting various types of signals emitted by a display
device and/or an individual speaker and/or a group of
speakers, a processor Which is able to process the signal, and
a communication device (electromagnetic) Which can com
municate information to and from the main surround sound
unit and/or the display device. After a user issues a com
mand on the hand-held device (27) to initiate the setup
taught in the Plunkett Patent (US. Pat. No. 5,386,478)
Which is hereby incorporated by reference into this appli
procedure, the device sends a command to the main sur
cation. HoWever, in recent years, ?lm sound, television
audio, and music playback formats have changed to incor
device (131) to generate the test signals (133, 21-26, 128,
porate the popularity of surround sound for improved tonal
ity and accurate spatial reconstruction of sound. In particu
lar, digital multi-channel surround sound technology has
fostered an approach to achieve unparalleled ?delity in
sound reproduction. One step in achieving that task, hoW
ever, is properly setting up a sound system for optimal
performance. An improperly set-up surround sound system
can result in noticeably inferior sound quality and/or inac
curate reproduction of the sound the original artist or direc
tor intended. A variety of parameters, including, speaker
location, listener location, phase delay, speaker level, equal
iZation, and bass management, all play an important part in
the surround sound set up and subsequent audio perfor
mance. Existing audio systems alloW the user to set these
parameters manually, either on a hand held remote control,
or on the main surround sound unit. Parameter adjustment
for multi-channel surround sound, hoWever, is becoming
increasingly complex and dif?cult, especially With digital
multi channel audio.
[0005] Televisions, projectors, and other display devices
used in home theatre systems have come a long Way in
recent years in regard to visual quality. HoWever, to achieve
this quality, or to achieve an intended visual reproduction, it
is usually necessary that various visual parameters in the
display be set, for a particular vieWing environment such as
a dark room. These parameters may include brightness, tint,
color, White level, and contrast. Existing display devices
alloW the user to manually adjust these parameters, hoWever,
this can be burdensome and many vieWers are not properly
trained for making these settings.
[0006]
Therefore, a need still exists for an apparatus and
method capable of easily and completely setting a complex
set of audio and visual parameters in a home theatre system,
including a multichannel surround sound audio system and/
or a display system.
INVENTION SUMMARY
[0007] A general feature of the present invention is to
provide a system and method for setting various acoustic
and visual parameters for optimal or intended reproduction
of digital multi-channel surround encoded audio and for
round sound unit (1) or the program source (2) or the display
129). The sensor or group of sensors on the remote device
(6) then detects the test signal(s) from an output device (135)
in a display device (131) and/or an individual speaker and/or
a group of speakers (15-20, 120-127). It then processes the
signal, determines the adjustment Which needs to be made,
and sends the appropriate adjustment command to the main
surround sound unit (1) and/or the display device (131).
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is an exemplary system diagram in accor
dance With one embodiment of the present invention, in
Which a remote control receives test signals generated by six
speakers and sends an adjustment command to the main
surround sound unit.
[0010] FIG. 2 is an exemplary method diagram in accor
dance With one embodiment of the present invention, in
Which the cascaded process of generating a test signal,
adjusting a level parameter, a time parameter, and a fre
quency parameter, is described.
[0011] FIG. 3 is an exemplary method diagram in accor
dance With one embodiment of the present invention, in
Which the process of generating a test signal, adjusting a
level parameter, a time parameter, and a frequency param
eter, is described.
[0012] FIG. 4 is an exemplary method diagram in accor
dance With one embodiment of the present invention, in
Which the process of generating a test signal, adjusting a
level parameter, a time parameter, a frequency level param
eter, a frequency center parameter, and a frequency band
Width parameter is described.
[0013] FIG. 5 is an exemplary method diagram in accor
dance With one embodiment of the present invention, in
Which the process of generating a test signal, adjusting a
level parameter, a time parameter, a frequency level param
eter, a frequency center parameter, and a frequency band
Width parameter, a tint parameter, a color parameter, a
brightness parameter, a White level parameter, and a contrast
parameter is described.
[0014] FIG. 6 is an exemplary system diagram in accor
dance With one embodiment of the present invention, in
Sep. 26, 2002
US 2002/0136414 A1
Which a remote control receives test signals generated by
seven speakers and sends an adjustment command to the
main surround sound unit.
each surround sound speaker, in regard to level, various
frequency parameters, and time. For eXample, the test sig
nals for all of the channels may specify that the listener, at
some predetermined position, should hear, from all of the
speakers (15-20), sound that has a ?at frequency response,
[0015] FIG. 7 is an exemplary system diagram in accor
dance With one embodiment of the present invention, in
Which a remote control receives test signals generated by
seven speakers and receives test signals generated by a
display device and sends adjustment commands to the main
surround sound unit and to the display device.
arrives at the same time to the listener’s ears (i.e., no delay
betWeen any of the speakers), and is at the same relative
sound pressure level (i.e., if the volume is set to 75 dB, the
DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENTS
(19) and rear right (18) speakers sound that is equalized to
[0016] This description is not to be taken in a limiting
sense, but is made merely for the purpose of illustrating the
general principles of the invention. The section titles and
overall organiZation of the present detailed description are
listener Will, in fact, hear 75 dB from each speaker). Alter
natively, the test signals may specify that the listener, at
some predetermined position should hear from the rear left
enhance higher frequencies, and at the same relative decibel
level (sound pressure level) as every other speaker. More
over, the sound produced by the speakers (19) and (18) may
arrive slightly later than the front left (15) and front right
(17) speakers. The test signal(s) (133) from the output
for the purpose of convenience only and are not intended to
device (135) in the display device (131) are initiated in a
limit the present invention. Accordingly, the invention Will
be described With respect to making automatic adjustments
in a digital 6-speaker (Where one speaker is a subWoofer)
similar fashion and correspond to What the home theatre user
surround sound system. It is to be understood that the
routine may be done automatically and/or able to make any
particular digital surround sound format described herein is
for illustration only; the invention also applies to other
type of setting, speci?ed by the test signals.
should see from the output device, in regard to color,
contrast, tint, brightness and White level. The calibration
Parameters
[0020] FIG. 2 illustrates by Way of eXample a How chart
that represents a cascaded functional algorithm for the
automatic calibration routine for setting up a digital multi
channel surround sound audio system in a home theatre
[0018] FIG. 1 illustrates by Way of eXample a simpli?ed
system diagram representing one embodiment of the present
invention, Wherein a remote control (27) receives test sig
What the listener should hear from each speaker is repre
sented by 30. The information 30 can be stored in either 1
or 2 or 27 in FIG. 1. Alternatively, the test signal informa
surround sound formats.
[0017] I. Automatic Adjustment of Surround Sound
nals (21-26) generated by siX speakers (15-20), then pro
cesses the test signals With its onboard processor (29) and
then sends an adjustment command(s) information (14) to
the main surround sound unit (1) via an electromagnetic
communications link (28, 12). For this eXample, there are siX
speakers in the surround sound system (15-20) and one of
the speakers a sub Woofer (20). Of course, it is to be
understood that siX speakers is described herein for illustra
tion only; that is, the invention also applies to any number
of speakers for achieving surround sound With or Without a
sub Woofer (see FIG. 6 for seven speakers embodiment With
sub Woofer). To optimiZe the surround sound effect, the
listener simply initiates the adjustment process on the
remote device (27), and the system automatically adjusts
system. The original test signals and/or information about
tion can be stored remotely on a database, and either the
program source (2) or the remote control (27) or the main
unit (1) can doWnload this information via a telephone
modem connection, or other netWork connection
That is,
the information 30 may be stored in a variety of methods
knoWn to one skilled in the art or methods developed in the
future.
[0021] After the initiation command (44) is given, the test
signals are generated (32) by the speakers (15-20, FIG. 1).
For this eXample, the system may assume that the original
test signals (30) specify that the listener should hear sound
at the same relative sound pressure level from each speakers,
With no delay betWeen each speaker, and at a ?at frequency
response. The original test signal information (30) (Which
itself to a predetermined optimal setting. Of course, the
predetermined setting may be adjusted by the user or
adjusted by the manufacturer through a communication
predetermined information, along With the actual audible
medium, such as the Internet.
test signal (this can be ping noise, pink noise, a tone at a
[0019]
To make the audio adjustment, a home theatre user
can be stored in either 1 or 2 or remotely) includes this
speci?c frequency, pulses, etc).
?rst initiates the adjustment process by issuing a command
on the remote control unit (27). Thereafter, the communi
[0022]
cation link device (28) on the remote control device can then
communicate With the main surround unit (1) via the com
After a test signal is generated, the system may run
a series of conditional checks to determine if the acoustic
munication link on the main surround sound unit (12) by
parameters are correct, and make the appropriate adjust
ments. For eXample, With the level condition 33, if the
original test signal information indicates that the listener
transmitting and receiving electromagnetic signals, for
should hear sound at an equal sound pressure level from
eXample. The main surround sound unit (1) then initiates the
each of the individual speakers, then the sensor (6) in the
remote control (27) should detect equal decibel levels from
each of the individual speakers. In other Words, if the
volume setting of the poWer ampli?er (10, FIG. 1) is set to
test signals Which are originally stored in either the main unit
(1) or provided on the digital multi-channel surround sound
program source (2) or provided on the remote control unit
(27), or the main unit or the program source can doWnload
the test signals from the internet via the netWork commu
nication link
The test signals from the speakers (15-20,
120-127) correspond to What the listener should hear from
75 decibels, the sensor in the remote control unit should
detect the actual sound at or near 75 decibels from each of
the speakers. A myriad of factors, hoWever, can affect the
quality of sound, such as positioning of the speaker, room
Sep. 26, 2002
US 2002/0136414 A1
acoustics, etc. For example, depending on the con?guration
of the room and the positioning of the speakers, if the sound
is set to X decibels, the listener may actually hear the sound
at Y decibels, Which is equal to (X+N) decibels, Where N is
some arbitrary offset factor, Which can be positive or nega
tive.
[0023] With the present invention, hoWever, once the
sensor (6) in the remote device (27) measures the actual
sound level, the remote control unit may determine the level
correction that is needed, and send this information (14) via
the communications link (12, 28) back to the main unit (1)
Which adjusts the level. Put differently, the present invention
corrects for the offset factor N. Alternatively, the remote
device may measure the actual sound level, and send this
measured level information back to the main unit (1) Which
may then determine What level of correction is needed, and
make that adjustment. For eXample, if the sensor on the
remote actually detects 73 decibels, yet it is set at 75 decibels
on the main unit, the remote control unit (27) may send the
command to the main unit (1) to adjust the measured speaker
volume by +2 decibels. Still further, the remote control unit
may send the measured level to the main unit (1), and the
main unit may calculate and make the appropriate adjust
ment. After the adjustment is made, the test signal may be
generated With the change (+2 decibels in this example), and
the sensor in the remote control again reports the detected
level. If more adjustment is needed, the process discussed
above continues. If no adjustment is needed, hoWever, the
adjustment value is stored and the process moves on.
ther, the test signal generated in 32 may be one test signal
from a single speaker. The sensor on the remote control
determines the time delay and calculates the appropriate
adjustment that needs to be made in order to properly
synchroniZe the time so that the listener can hear synchro
niZed sound (for eXample, to synchroniZe the sound for a
particular frame of a movie).
[0026] After the adjustment is made (in 8, FIG. 1), a test
signal may be generated With the change, and the sensor in
the remote control again determines and reports the time
delay information. If more adjustment is needed, the loop
continues. If no adjustment is needed, hoWever, the adjust
ment value is stored and the process moves on.
[0027] In FIG. 2, the condition 35 represents the adjust
ment stage for the frequency condition. The test signal
information in (32) may include information regarding the
frequency settings for single or multiple speakers. For
eXample, the information may indicate that the frequency
equaliZation for all of the speakers in a speci?ed frequency
spectrum should be ?at. Put differently, the sensor in the
remote control may determine, for all the frequencies in that
spectrum, What the relative levels are and then make the
appropriate adjustment calculations and send them to the
main unit (1) for correction. Alternatively, the sensor in the
remote control may determine, for all the frequencies in that
spectrum, What the relative levels are and send this infor
mation to the main unit to make the proper calculations and
corrections. After the adjustment is made, the test signal is
generated With the change and the sensor (6) in the remote
[0024] The information in the original test signals (30)
control (27) again determines and reports the frequency
may also specify the time condition for the system. For
information. If more adjustment is needed, the loop contin
ues. If no adjustment is needed, the adjustment value is
eXample, the information in the original test signals (30)
may specify that the listener should hear the sound from
each of the speakers 15-20 at precisely the same time.
Because the listener may not be equidistant from each
speaker, the time it takes for a sound signal originating from
a particular speaker to travel to the listener may be different.
For instance, it may take T milliseconds for a sound signal
originating from speaker 16 to travel to the listener, and it
may take T+N milliseconds for a sound signal originating
from the speaker 17 to travel to the listener. In order for the
sound to arrive at the listener from both speakers at the same
time, the sound from speaker 17 must be played in advance,
or, alternatively, the sound from speaker 16 must be delayed.
The information stored in the original test signal may
specify Which speaker to calibrate the time adjustment to, or
specify some synchroniZation standard to Which each
speaker may be adjusted.
[0025] In FIG. 2, the condition 34 represents the adjust
ment stage for the time condition in Which the test signal is
generated in 32, Which may be N, Where N is some Whole
integer number, pulses generated by N different speakers.
The sensor (6) on the remote control (27) may determine
Which pulse originated from Which speaker. This enables the
sensor to measure the difference in time betWeen the arrival
of the N pulses. If there is a difference, the processor in the
remote control (27) may determine the necessary adjustment
that needs to be made (Where a delay needs to be applied)
and sends the adjustment information to the main unit Which
makes the correction. The remote control unit may alterna
tively send the information regarding the arrival times
and/or relative delay to the main unit, Which then makes the
appropriate adjustment calculation and applies it. Still fur
stored and the process moves on.
[0028] In FIG. 2, The frequency and level conditions may
be interdependent, so that the conditional checks (33 and 35)
may take both factors into account When determining What
the adjustments should be made.
[0029] FIG. 3 illustrates by Way of eXample a How chart
that represents a parallel functional algorithm for the auto
matic calibration routine. The original test signals and/or
information about What the listener should hear from each
speaker is represented by 50 (This information can be stored
in either 1 or 2 or 27 in FIG. 1). Alternatively, 50 may be
stored remotely and may be doWnloaded from the Internet,
via the netWork communication link (3) for eXample. In this
Way, the algorithm may be modi?ed for updates so that it
may be doWnloaded. After the initiation command (51) is
given, the system initially processes the test signal informa
tion (53) to determine What the desired multi-channel sound
settings are, i.e., the sound pressure level, the frequency
level, the time delay, and to specify a testing algorithm (54).
That is, the algorithm may be speci?ed to test the different
elements (time, frequency, and level) and/or hoW to test the
different elements (parallel or serially) and/or Which ele
ments to test. All of the system processing (52) may be
performed in a variety of Ways, for eXample, it may be
performed through the remote control (27) or the main
surround sound unit (1) or the program source unit
[0030] The testing algorithm (54) may instruct the soft
Ware condition sWitch (61) so that the system can properly
set Which conditions should be checked according to the
testing algorithm (54). For eXample, if the original test
Sep. 26, 2002
US 2002/0136414 A1
signal information speci?es that the sound the listener
needed, the adjustment and processing continues. If no
should hear should be at an equal sound pressure level, ?at
adjustment is needed, hoWever, the processing softWare may
equalization, and at an equal time (no delay betWeen the
arrival of sound at the listeners ears), the initial processing
(53) may specify an adjustment algorithm (54) so that the
sound pressure level and frequency conditions may be
determine if there are any other adjustments that need to be
made (55). If there are other adjustments that need to be
checked ?rst, simultaneously, and once these levels are set,
the time condition may be checked and set. In this eXample,
Which detection element(s) should be turned on and Which
the algorithm may include the appropriate information for
the softWare sWitch (61) to turn off the time condition sWitch
(60), and turn on the level and frequency condition sWitches
(58, 59) so that the sound pressure level and frequency
conditions may be checked ?rst. The algorithm then for
Wards the initial level and frequency settings to generate the
test signals (80) Which are generated by the speakers (15-20,
120-127). Once the softWare sWitch (61) is properly set, the
frequency and level detection may be done in parallel at 65
and 66, respectively.
[0031]
Thereafter, a sensor (6) in the remote control unit
(27) reports the detected sound pressure level and frequency
characteristics of the test signal (represented by steps 65 and
66 on the method ?oWchart FIG. 3). The sensor (6) may be
a single condenser microphone and/or multiple condenser
made (in this eXample, the time delay still needs to be set),
the testing algorithm (54) Will specify to the sWitch (61)
detection element(s) should be turned off. For this eXample,
the processing (52) instructs the sWitch (61) to turn off the
level and frequency detection (59, 60) and turn on the time
detection (58). The routine for the time delay adjustment
then begins.
[0034] For the time delay, the test signals generated in 80
may be N, Where N is some Whole integer number, pulses
generated by N different speakers. The sensor (6) in the
remote control unit (27) detects Which pulse originated from
Which speaker. The remote control (27) may process the
information obtained by the sensor (6) With its internal
processor (29) and send the adjustment settings back to the
main unit (1) via the communications link (12, 28). Alter
natively, the remote control unit (27) may send the infor
mation obtained by the sensor (6) to the main unit (1) via the
different frequency spectrums. Of course, other sensors
communications link (12, 28), and the processor (11) in the
main unit (1) may determine the necessary adjustments.
With regard to the method ?oWchart FIG. 3, the time delay
knoWn to one skilled in the art may be used as Well. The
information obtained by the sensor (6) occurs in (64) and is
remote control (27) may process the information obtained by
the sensor (6) With its internal processor (29) and send the
adjustment settings back to the main unit (1) via the com
then processed (52).
microphones and/or multiple microphones optimiZed for
munications link (12, 28). Alternatively, the remote control
unit (27) may send the information obtained by the sensor
(6) to the main unit (1) via the communications link (12, 28),
and the processor (11) in the main unit (1) may determine the
necessary adjustments.
[0032] With regard to the ?oWchart FIG. 3, the informa
tion obtained by the sensor (6) may occur in (65) and (66)
and is then processed in the processor (52). The measured
levels are processed (52) to determine if further adjustment
is needed (56). If the detected levels (sound pressure and
frequency) are equal or Within an acceptable range to the
levels speci?ed in the test signal information (50), the
adjustment for those levels may be stored, and the system
continues. If, hoWever, more adjustment is needed, the
processing (52) may make a further adjustment (62). Fur
ther, there may be multiple sub-levels of the frequency level
detection and setting (i.e., the frequency level test may
include X sub tests of various frequencies). The frequency
and level conditions may be interdependent, so that process
ing (52) may take both factors into account When determin
ing What the adjustments (62) should be. For eXample, even
though the level condition may already be optimal (i.e., the
detected level is equal to the desired level speci?ed in the
test signal information), if the frequency settings are
[0035]
The sensor (6) on the remote control (27) may
determine Which pulse originated from Which speaker. This
enables the sensor to measure the difference in time betWeen
the arrival of the N pulses (64). If there is a difference, the
processor (29) in the remote control (27) may determine the
necessary adjustment that needs to be made (Where a delay
needs to be applied) and sends the adjustment information to
the main unit (1) Which makes the correction. This may be
accomplished in the processing stage in the method ?oW
chart (52). The remote control unit may alternatively send
the information regarding the arrival times and/or relative
delay to the main unit, Which then makes the appropriate
adjustment calculation and applies it. Alternatively, the test
signal generated in 80 may be one test signal from a single
speaker. The sensor (6) on the remote control (27) deter
mines the time delay and calculates the appropriate adjust
ment that needs to be made in order to properly synchroniZe
the time so that the listener hears a sound to some prede
termined timing, for eXample to synchroniZe the sound for
a particular frame of a movie. Again, this is accomplished in
the processing stage in the method ?oWchart (52). After the
adjustment is made, the test signal may be generated With
the change and the sensor (6) in the remote control (27)
again determines and reports the time delay information
(64). If the processing (52) determines more adjustment is
needed, the loop continues. If no adjustment is needed, the
changed, the overall level may be affected and may have to
adjustment value is stored and the process moves on. When
be adjusted again to achieve an optimal setting for both
sound pressure level and individual frequency levels. The
processing softWare may determine What adjustments need
all of the information is correct as speci?ed in the original
to be made in order to achieve the desired results for both the
frequency and level settings.
[0033] After the adjustment is made (62), the test signal
may be generated (80) With the changes (for both the
frequency and level), and the sensor (6) in the remote control
(27) again reports the detected levels. If more adjustment is
test signal (50) information, the processing (52) saves the
settings (57) and the setup is complete (81).
[0036] FIG. 4 illustrates by Way of eXample a How chart
that represents a functional algorithm for the automatic
calibration routine, similar to the embodiment described
above for FIG. 3, With tWo additional criteria for detection;
namely, a frequency center (90) detection and a frequency
bandWidth detection (91). The original test signals and/or
Sep. 26, 2002
US 2002/0136414 A1
information about What the listener should hear from each
speaker is represented by 50 (This information may be
for those center frequencies may be stored, and the system
may continue. If, hoWever, more adjustment is needed, the
stored in either 1 or 2 or 27 in FIG. 1). Alternatively, 50 may
processing (52) may make further adjustments (62). The
be stored remotely on a computer and can be downloaded
via a global and/or local and/or Wide area netWork connec
frequency center may be interdependent With the other
settings, so that processing (52) may take multiple factors
into account When determining What the adjustments (62)
tion
After the initiation command is given (51), the
system initially processes the test signal information (53) to
determine What the desired multi channel sound settings are,
such as sound pressure level, frequency level, frequency
center, frequency bandWidth, and time delay, and to specify
a softWare testing algorithm (54). The softWare testing
algorithm may specify Which order to test the different
elements (time, frequency level, frequency center, frequency
bandWidth, and sound pressure level) and/or hoW to test the
different elements (parallel or serially) and/or Which ele
ments to test.
[0037]
Each detection Which is to be set: sound pressure
level, frequency level, frequency center, frequency band
Width, and time delay, may be represented in the algorithm
as variables Dspl, D?, Dfc, Db and Dt, respectively. If tWo
should be. For example, even though the frequency center
may already be optimal (i.e., the detected center is equal to
the desired center speci?ed in the test signal information),
the algorithm may calculate that if the frequency levels are
changed, the center may be affected and may have to be
changed slightly to achieve an optimal setting for both level
and frequency center. The processing softWare may deter
mine What adjustments need to be made to achieve the
desired results for the frequency center and any other
detection criteria Which may be affected. After the adjust
ment is made (62), the test signal may be generated (80) With
the change (for both the frequency center and frequency
level), and the sensor (6) in the remote control (27) again
criteria are to be detected and set simultaneously, the algo
rithm may represent them With an ‘&’ symbol. Further, a
reports the detected levels. If more adjustment is needed, the
adjustment and processing continues. That is, one feature of
the present invention is that When setting one particular
coef?cient may be attached to an individual variable, or
group of variables connected With an ‘&’ symbol to indicate
take another criteria into account to determine What overall
the order of testing. So, for example, if the algorithm
speci?es checking and setting the Sound Pressure Level,
(64-66, 90, 91) may be interdependent.
frequency level, frequency center, and frequency bandWidth
simultaneously ?rst, and then check and set the time delay,
it may specify the algorithm: 1(DSP1 & D? & Dfc & Db),
2(Dt). Each detection and setting (Dspl, D?, Dfc, Db and D)
may contain subsets of detections and setting. For eXample,
the frequency level may contain J independent tests for J
different frequencies. The softWare algorithm may specify
testing all J independent frequencies simultaneously, or
sequentially. The softWare algorithm may also determine an
appropriate test signal. The algorithms can be predetermined
in the system and/or can be determined at the time of testing
and/or can be catered to the information in the program
source. There may be many possible combinations of the
order of testing of the different elements. All of the system
processing (52) can be performed in either the remote
control (27) or in the main surround sound unit (1) or the
program source unit (2) or in the actual speakers (15-20,
120-126). The system processing (52) may include a Digital
Signal Processor and/or With analog processing means. Both
methods of analyZing and manipulating acoustic data are
Well appreciated in the art. The testing algorithm (54) may
instruct the softWare condition sWitch (61) so that the system
can properly set Which conditions should be checked accord
ing to the testing algorithm (54). The softWare sWitch (61),
properly set alloWs the appropriate detection’s to be done in
parallel or serially.
[0038] The detection and setting for sound pressure level,
frequency level, and time condition is substantially similar
to the discussion above related to FIGS. 3 and 4. For the
frequency center, the sensor (6) in the remote control unit
(27) reports the detected center frequency or frequencies of
the test signal(s) (represented by step 92 on the method
?oWchart FIG. 4). The measured center levels are processed
(52) to determine if adjustment is needed (i.e., the detected
frequency center is different from the speci?ed frequency
center in the test signal). If the detected centers (frequency
center) is equal or Within an acceptable range to the centers
speci?ed in the test signal information (50), the adjustment
criteria (64, 65, 66, 90, 91), the system processing (52) may
adjustments need to be made (56). Note that all of the criteria
[0039] The adjustment for the frequency bandWidth is
substantially similar to the adjustment for the frequency
center described above.
[0040]
II. Automatic Adjustment of Visual Parameters
[0041] FIG. 5 illustrates by Way of eXample a How chart
that represents a functional algorithm for the automatic
calibration routine, similar to the embodiment described
above for FIG. 4, With additional criteria for detection;
namely, visual detection for the display used in the home
theatre environment (i.e., Television, Projector, LCD,
plasma display) Which may include Contrast detection,
Color detection, White level detection, Sharpness detection,
tint detection, and/or brightness detection. The correspond
ing system diagram is represented by FIG. 7. The detection
and setting for acoustic criteria (in FIG. 5) is substantially
the same as described in the embodiment representing FIG.
4. The sWitch settings (61) in FIG. 5 include a higher level
sWitch Which can select betWeen audio (114) and/or video
(113) detection. The original test signals and/or information
so that the vieWer should vieW from the display is repre
sented by 50 may be stored in either 1 and/or 2 and/or 27
and/or 131.
[0042] Alternatively, the original test signals 50 may be
stored remotely on a computer and can be doWnloaded by
the display device (131), the program source (2), the sur
round sound main unit (1), and the remote control unit (27)
internet. Of course, the original test signals 50 may be
doWnloaded through a local and Wide area netWork connec
tion as Well. For eXample, a speci?c movie director may
desire certain visual settings for a particular movie, and may
offer this information on an internet Web site, or alternatively
include this information on the storage medium (i.e., DVD)
for the movie
After the initiation command is given (51),
the system initially processes the test signal information (53)
to determine What the desired optical vieWing settings are, in
regard to contrast, White level, tint, color, and brightness, to
Sep. 26, 2002
US 2002/0136414 A1
specify a software testing algorithm (54). The software
[0045] Each visual element for detecting (103-107) may
testing algorithm then speci?es the order in Which to test the
be interdependent to other visual elements (104-107), so that
different visual detection elements and/or hoW to test the
processing (52) may take multiple factors into account When
determining the adjustment(s) (62) that needs to be made.
different elements (parallel or serially) and/or Which ele
ments are to be tested. Each of the detection’s Which are to
The visual elements can be detected and processed in
be set, contrast, White level, tint, color, and brightness, may
be represented in the algorithm as variables Vcontmst, VCOIOI,
Vwhite, Vbright, and Vtint respectively. If tWo criteria are to be
parallel or serially. After the adjustments (if needed) are
made (62), the test signal may be generated (80) With the
change, and the sensor(s) (6) in the remote control (27) again
reports the detected level(s). If more adjustment is needed,
detected and set simultaneously, the algorithm may repre
sent them With an ‘&’ symbol. Further, a coef?cient may be
attached to an individual variable, or group of variables
connected With an ‘&’ symbol to indicate the order of
the adjustment and processing continues. If there are still
other visual adjustments that need to be made according to
testing. For example, if the algorithm speci?es that checking
and setting the contrast, White level, and brightness ?rst, and
sWitch (61) Which detection element(s) should be turned on
then checking and setting the tint and color, it may specify
the algorithm: 1(Vb right & Vcontrast & Vwhite), 2(Vcolor &
speci?ed in the original test signal (50) information, the
Vtint)‘
[0043]
the testing algorithm, the processing may specify to the
and off. When all of the visual information is correct as
testing setting and processing stops and the setup is com
plete.
Each detection and setting criteria may contain
[0046] Another application of the present invention is a
subsets. For example, the color detection may contain J
independent tests for J different color frequencies. The
home theatre system in Which a user may be able to vieW all
softWare algorithm may specify testing all J independent
color frequencies simultaneously, or sequentially. The soft
Ware algorithm may also determine an appropriate visual
test signal. The algorithms can be predetermined in the
system and/or can be determined at the time of testing and/or
can be catered to the information in the program source.
There may be many possible combinations of the order for
testing the different elements. All of the system processing
(52) can be performed in either the remote control (27), the
main surround sound unit (1), the program source unit (2),
or in the display device (131). The system processing (52)
may include a Digital Signal Processor and/or an analog
processing means. The testing algorithm (54) may instruct
the softWare condition sWitch (61) so that the system can
properly set Which conditions should be checked according
to the testing algorithm (54). Once the softWare sWitch (61)
is properly set, the appropriate detection’s may be done in
parallel or serially.
[0044] For visual detection (103-107) and processing (52),
the test signal(s) may include a myriad of patterns and/or
signals. For brightness, contrast, tint, and White level, the
test signals may include grayscale patterns, intensity maps,
brightness maps, and individual frequency signals (i.e.,
White screen). For color, the test signals may include color
maps, color patterns, grayscale patterns, and individual color
frequency signals (i.e., blue screen, red screen, green
screen). The sensor (6) or plurality of sensors (6) in the
remote control unit (27) reports the detected visual charac
teristic of the test signal (103-107) on the method ?oWchart
FIG. 5. The sensor (6) in the remote control (27) may
include, an optoelectric sensor, a luminance detector, an
optical comparator, a color analyZer, a light sensitive sensor,
and a digital camera for detecting visual elements (103-107,
FIG. 5). Devices to detect and measure color, White level,
brightness, contrast and tint are Well appreciated in the art.
The measured visual criteria may be processed (52) to
determine if adjustment is needed (i.e., the detected visual
level is different from the speci?ed level in the test signal).
If the visual element is equal to or Within an acceptable
range to the visual element speci?ed in the test signal
information (50), the adjustment for the visual element may
be stored, and the system may continue. If, hoWever, more
of the adjustment settings, vieW frequency graphs, select
adjustment settings, vieW test signal information, and gen
erally folloW the adjustment process by vieWing, and inter
acting With a display device (76) attached to the remote
control unit (27). The display device may be a color or black
and White LCD (liquid crystal display) screen, Which may be
touch screen enabled (so the user may input commands).
The processing (52) in the system may include a connection
to the display device so that any stage of the adjustment
process can be outputted. For example, the user may be able
to vieW on the display screen (76) frequency response curves
from a given speaker. As a further example, the user may be
able to vieW and select multiple con?gurations for automatic
calibration. As yet another example, the listener may be able
to choose and select betWeen different visual settings, such
as black and White, melloW, faded, high contrast, etc.
[0047] Yet another feature of the present invention is that
all of the system processing (52) may be performed on the
on-board processor (29) in remote control unit (27), With the
settings then sent to the main unit (1), program source (2),
and display device (131) for storage. The on-board processor
(29) may include a DSP (Digital Signal Processor), an
analog signal processor, and a microcomputer. The proces
sor (29) may also be coupled to the output display device
(76) to vieW information relating to the adjustment settings.
The processor may also send information via electromag
netic link (12, 130) to the display device (131) to vieW
information relating to the adjustment settings on the output
device (135) of the display device (131). Alternatively, all of
the system processing (52) may be performed on the pro
cessor in the main unit (1), the program source (2), the
display device (131); the appropriate information is then
sent via the communications link (12) to the remote control
unit’s (27) display device (76) for output.
[0048] Another application of the present invention is for
a modern digital surround sound system that includes an
optional band-limited loW frequency effects (LFE) channel,
in addition to the discrete and main channels. In contrast to
the main channels, the LFE delivers bass-only information
adjustment is needed, the processing (52) may make a
and has no direct effect on the perceived directionality of the
reproduced soundtrack. The LFE channel carries additional
bass information to supplement the bass information in the
main channels. The LFE channel may be realiZed by sending
further adjustment (62).
additional bass information through any one or combination
Sep. 26, 2002
US 2002/0136414 A1
of the main speakers (15-20). The proper settings for the
LFE channel can be obtained through the process outlined in
FIGS. 2, 3, 4, and 5. For example, the signal in the LFE
channel may be calibrated during soundtrack production to
be able to contribute 10-Decibel higher Sound Pressure
Level than the same bass signal from any one of the front
6. A system according to claim 1, Wherein said predeter
mined setting is a frequency bandWidth setting.
7. A system according to claim 1, Wherein said predeter
mined setting is a time delay setting
8. A system according to claim 1, Wherein said sensor in
said remote control is a microphone.
5 proceed With a set of test signals and test signal informa
tion, for the channels Which make up the LFE channel.
9. A system according to claim 8, Wherein said micro
phone is a condenser microphone
10. A system according to claim 1, Wherein said multi
We claim:
channel surround sound decoder of said main surround
sound unit of said surround sound audio system is a DolbyTM
channels. In other Words, the process in FIGS. 2, 3, 4, and
1. A system for automatically adjusting a home theatre
system comprising:
Digital decoder.
11. Asystem according to claim 1, Wherein said processor
a processor communicatively coupled to said sensor;
and
of said remote control is a digital signal processor.
12. A system according to claim 1, Wherein said processor
of said remote control is an analog signal processor.
13. A system according to claim 1, Wherein said remote
control further includes an output display device.
a ?rst communication device communicatively coupled
display device of said remote control is at least one light
a remote control, including:
a sensor;
to said processor in said remote control;
a surround sound audio system, including:
a main surround sound unit, having:
a multi-channel surround sound decoder adapted to
decode an encoded multichannel program audio
from a program source;
an ampli?er coupled to said multi-channel surround
sound decoder to amplify the decoded program;
a second communication device adapted to commu
nicate With said ?rst communication device;
a plurality of speakers, Wherein said speakers are
communicatively coupled to said main surround
sound unit;
Wherein said main surround sound unit generates a test
signal based on a ?rst predetermined setting and
sends the test signal to at least one of said plurality
of speakers Wherein said at least one of said plurality
of speakers that received said test signal generates an
acoustic test signal based on said test signal; and
Wherein said sensor in said remote control receives the
acoustic test signal as an input generated by said one
of said plurality of speakers that received the test
signal, said sensor in said remote control outputs the
input to said processor in said remote control, said
14. A system according to claim 13, Wherein said output
emitting diode coupled to the processor.
15. A system according to claim 13, Wherein said output
display device of said remote control is at least one LCD
screen coupled to the processor.
16. A system according to claim 1, further comprising:
a display device including:
an output device;
a third communication device adapted to communicate
With said ?rst communication device of said remote
control;
Wherein said display device generates a test signal based
on a second predetermined setting and sends the test
signal to the output device Wherein said output device
that received said test signal generates a visual test
signal based on said test signal; and
Wherein said sensor in said remote control receives the
visual test signal as an input generated by said output
device that received the test signal, said sensor in said
remote control outputs the input to said processor in
said remote control, said processor determines an
adjustment Which needs to be made so that the test
signal detected by said sensor in said remote control is
substantially similar to said second predetermined set
ting, said processor transmits the adjustment informa
tion via said ?rst communication link to said display
device.
17. A system according to claim 16, Wherein the display
processor determines an adjustment Which needs to
be made so that the acoustic test signals detected by
said sensor in said remote control is substantially
device is a television.
similar to said ?rst predetermined setting, said pro
predetermined setting is a brightness setting.
cessor transmits the adjustment information via said
?rst communication link to said main surround
sound unit.
2. A system according to claim 1 Wherein said main
surround sound unit of said surround sound audio system is
18. A system according to claim 16, Wherein said second
3. A system according to claim 1, Wherein said predeter
mined setting is a sound pressure level setting.
4. A system according to claim 1, Wherein said predeter
19. A system according to claim 16, Wherein said second
predetermined setting is a color level setting.
20. A system according to claim 16, Wherein said second
predetermined setting is a contrast setting.
21. A system according to claim 16, Wherein said second
predetermined setting is a tint setting.
22. A system according to claim 16, Wherein said second
predetermined setting is a White level setting.
23. A system according to claim 1, Wherein said main
mined setting is a frequency level setting.
5. A system according to claim 1, Wherein said predeter
mined setting is a frequency center setting.
surround sound unit of said surround sound audio system
including a netWork connection device communicatively
coupling the main surround sound unit to the internet.
a THXTM certi?ed unit.
Sep. 26, 2002
US 2002/0136414 A1
24. A system according to claim 23, wherein said ?rst and
second predetermined settings are downloaded from the
internet via said netWork communication device.
25. A method for automatically adjusting at least one of a
predetermined plurality of parameters in a home theatre
system, the method including the steps of:
sending a test signal based upon a predetermined setting
to a receiver, Wherein the test signal is designed to set
a home theatre system;
detecting the test signal by the receiver;
processing the test signal by the receiver to determine an
adjustment information based upon the predetermined
setting so that the test signal When adjusted to the
adjustment information is substantially similar to the
predetermined setting; and
producing an adjusted test signal that modi?es the test
signal based upon the adjustment information to sub
stantially match the predetermined setting.
34. The method of claim 25 Wherein the processor is an
analog signal processor to process the test signal.
35. The method of claim 25, further including the steps of:
providing an output device to display information relating
to the adjustment processing.
36. The method of claim 25 Wherein the test signal is a
visual test signal.
37. The method of claim 36 Wherein the predetermined
setting is a contrast level.
38. The method of claim 36 Wherein the predetermined
setting is a brightness level.
39. The method of claim 36 Wherein the predetermined
setting is a color level.
39. The method of claim 36 Wherein the predetermined
setting is a tint level.
39. The method of claim 36 Wherein the predetermined
setting is a White level.
40. The method of claim 25 Wherein the test signal is
detected through an optical sensor.
26. The method of claim 25 further including the steps of:
41. The method of claim 25 further including the step of:
sending the adjusted test signal to the receiver;
doWnloading the test signal from the internet.
42. The method of claim 25 further including the step of:
detecting the adjusted test signal by the receiver;
Wherein if the adjusted test signal is not substantially
similar to the predetermined setting then:
processing the adjusted test signal by the receiver to
determine a second adjustment information based
upon the predetermined setting so that the adjusted
test signal When adjusted to the second adjustment
information is substantially similar to the predeter
mined setting; and
producing a second adjusted test signal that modi?es
the adjusted test signal based upon the second adjust
ment information to substantially match the prede
termined setting.
27. The method of claim 25 Wherein the test signal is an
obtaining the test signal from a program source.
43. The method of claim 42 Wherein the program source
is a digital video disc.
44. A remote control device, comprising:
a sensor adapted to receive a test signal from a multi
channel surround sound system;
a processor, Wherein the processor determines an adjust
ment information based upon the test signal and a
predetermined setting so that the test signal When
adjusted to the adjustment information is substantially
similar to the predetermined setting; and
a communication device adapted to send the adjustment
information to the multi-channel surround sound sys
tem, Wherein the multi-channel surround system cor
rects the test signal based upon the adjustment infor
acoustic test signal.
28. The method of claim 27 Wherein the predetermined
setting is a predetermined sound pressure level.
29. The method of claim 27 Wherein the predetermined
setting is a predetermined frequency bandWidth.
30. The method of claim 27 Wherein the predetermined
45. A remote control device, comprising:
setting is a predetermined frequency equalization.
a sensor adapted to receive a test signal from a multi
31. The method of claim 27 Wherein the predetermined
setting is a predetermined arrival time delay.
32. The method of claim 27 Wherein the test signal
receiver is a microphone.
33. The method of claim 25 Wherein the processor is a
digital signal processor to process the test signal.
mation to substantially match the predetermined
setting.
channel surround sound system; and
a communication device adapted to send the test signal to
the multi-channel surround sound system.
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