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JP2007173984

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007173984
PROBLEM TO BE SOLVED: To make it possible to adjust optimum sound field characteristics
regardless of the listening posture, and adjust while visually confirming the sound field
processing effect. SOLUTION: A reference audio signal supply unit 21 for supplying a reference
audio signal for causing a plurality of speakers 11 to 15 to output a reference audio for sound
field adjustment to the plurality of speakers 11 to 15, and the above reference audio A reference
image signal supply unit 22 supplying a reference image signal for causing the display unit 16 to
output the reference image to the display unit 16, and an operation unit correcting the reference
image according to the reference sound heard at the listening position And a control unit 27 that
calculates a delay correction value and a gain correction value given to each of the speakers 11
to 15 based on the correction amount of the reference image corrected by the operation unit 23.
[Selected figure] Figure 1
Sound field correction device
[0001]
The present invention relates to a sound field correction device for correcting the sound field
characteristic of an audio system provided with a plurality of speakers to a desired sound field
characteristic.
[0002]
As an audio system providing a high quality sound field space provided with a plurality of
speakers, there is a surround type one using a plurality of front speakers and a plurality of rear
speakers.
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[0003]
In order to set such a surround type sound field to an optimal one, it is necessary to dispose a
plurality of speakers at appropriate positions based on the listening position where the user
listens and listens.
[0004]
However, in general, there are various factors in the indoor environment in which such surround
sound apparatus is disposed, and the arrangement of each speaker is limited.
Also, it has been difficult for the user to adjust the best placement of each speaker.
[0005]
Therefore, after disposing the speakers, it is necessary to adjust the sound pressure level setting
and the sound arrival time setting according to the relationship between the listening position
and the position of each speaker, that is, it is necessary to correct the sound field.
[0006]
In the conventional sound field correction apparatus for performing sound field correction,
reference signals reproduced from individual speakers are collected by a sound collection device
such as a dedicated microphone, and based on data obtained by the sound collection device. By
adjusting the frequency characteristics, phase characteristics, sound pressure level, delay and the
like of each speaker, an optimum sound field was provided.
[0007]
However, even if the optimum sound field is generated at the position of the sound collection
device installed assuming the listening position (listening position) where the user actually listens
and listens, the user can confirm that this sound field correction effect is optimum. If it is difficult
to confirm, and if the sound collection device is at a difficult listening position, it is also difficult
to make an optimal sound field correction, and furthermore, an optimum sound field correction
that matches the user's listening posture. It was also difficult to do.
[0008]
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Further, in the conventional sound field correction apparatus, a dedicated microphone for
measurement for measuring the sound field is required, a microphone connection terminal for
this dedicated microphone, a microphone amplifier, etc. are required, and further, electrical
connection with the main body of the device is required. It was necessary to match various
characteristics.
[0009]
Patent No. 2723001
[0010]
The object of the present invention is to make it possible to adjust optimum sound field
characteristics regardless of the user's listening position without providing a dedicated
microphone or the like for obtaining a desired sound field, and visualizing the sound field
processing effect The present invention is to provide a sound field correction device which makes
it possible to make adjustment while confirming it.
[0011]
In order to achieve this object, a sound field correction device according to the present invention
comprises a reference sound signal supply unit for supplying a reference sound signal for
causing a plurality of speakers to output a reference sound for sound field adjustment to the
plurality of speakers A reference image signal supply unit for supplying a reference image signal
for causing the display means to output a reference image corresponding to the reference sound
to the display means, and correcting the reference image according to the reference sound heard
at the listening position And a control unit that calculates a delay correction value and a gain
correction value given to each speaker based on the correction amount of the reference image
corrected by the operation unit.
[0012]
The present invention enables optimum sound field adjustment regardless of the user's listening
position without providing a dedicated microphone or the like for obtaining a desired sound field,
and visually confirming the sound field processing effect. Make it possible to adjust.
[0013]
Hereinafter, a sound field correction apparatus to which the present invention is applied will be
described with reference to the drawings.
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[0014]
The sound field correction apparatus 1 to which the present invention is applied is, as shown in
FIG. 1, for outputting reference sound for sound field adjustment to a plurality of speakers 11 to
15 arranged at arbitrary positions in the indoor environment 9. The reference audio signal is
supplied to the plurality of speakers, and the reference image signal for outputting the reference
image corresponding to the reference audio to the image display means 16 is supplied to the
image display means 16 and output by the plurality of speakers Sound field characteristics are
corrected by the user 8 listening to the reference voice at a predetermined position, ie, at an
arbitrary listening position, and receiving correction information when the reference image is
corrected by the operation unit 23 according to the reference voice It is.
[0015]
The plurality of speakers 11 to 15 are arbitrarily arranged at predetermined positions in the
room.
The plurality of speakers 11 to 15 are speakers for ordinary audio reproduction, and are
connected to an audio signal processing unit 10 having a multi-channel speaker output generally
used in home theaters and the like.
[0016]
The audio signal processing unit 10 performs signal processing such as delay processing and
gain processing for each channel of Lch (left), Rch (right), Cch (center), SLch (rear left), and SRch
(rear right). A signal is output to each speaker 11-15.
[0017]
As shown in FIG. 1, the sound field correction device 1 and a reference sound signal supply unit
21 that supplies reference sound signals for causing the plurality of speakers 11 to 15 to output
reference sound for sound field correction to the plurality of speakers. The reference image
signal supply unit 22 supplies to the image display unit 16 a reference image signal for causing
the image display unit 16 to output a reference image interlocked with the reference sound, and
the plurality of speakers 11 to 15 output the reference image signal. The operation unit 23
corrects the reference image displayed by the image display unit 16 according to the reference
voice actually listened to by the user 8 at the listening position, and receives the correction
information of the reference image input by the operation unit 23 And a receiver 24.
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[0018]
The reference audio signal supply unit 21 supplies reference audio signals to the plurality of
speakers via the audio signal processing unit 10, and thereby causes the speakers 11 to 15 to
output reference audio as a reference for sound field adjustment.
[0019]
The reference image signal supply unit 22 supplies the reference image signal to display the
reference image corresponding to the reference sound on the image display unit 16, and when
the correction information is input from the operation unit 23, the reception unit This
information is received via 24 and the reference image and the input corrected image are
displayed on the image display means 16.
[0020]
The operation unit 23 is a portable device which can be carried by the user 8 in the indoor
environment 9 and can input information for correcting a reference image at an arbitrary
position. For example, an input such as a remote controller capable of transferring information
by wireless communication It is an apparatus.
In order to optimize the sound field at the listening position (listening point), the user 8 manually
controls the sound image to be optimized using this operation unit 23.
Although the operation unit 23 is a button-type remote controller provided with a direction key
so that the image displayed on the image display means 16 can be easily corrected, the present
invention is not limited to this, and a stick-type controller or It may be a pen tablet type.
In addition, although the present embodiment is configured to transfer the user's input
information to the receiving unit 24 by wireless communication, the present invention is not
limited to this. For example, the input information is received by wired communication via a USB
cable, audio cable, etc. You may comprise so that it may transfer to the part 24. FIG.
[0021]
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For example, as shown in FIG. 2, the image display means 16 displays a moving object moving in
a manner to draw a locus K 1 by the reference image signal supplied by the reference image
signal supply unit 22.
The operation unit 23 compares the locus K1 with the first to third trajectories of the image
display means 16 in comparison with the movement K2 of the sound image by listening to the
reference sound supplied from the reference sound signal supply unit 21 at the listening
position. The correction information is input by being corrected for each of the sections BA, BB,
and BC, and is transferred to the receiving unit 24.
[0022]
The receiving unit 24 receives the correction information of the reference image input by the
operation unit 23 and transfers the information to the reference image supplying unit 22 to
display the corrected image of the reference image, which will be described later. The
information on the amount of adjustment of the corrected image is transferred to the delay
correction value calculation unit 25 and the gain correction value calculation unit 26.
[0023]
Further, the sound field correction device 1 corrects the delay correction value calculation unit
25 that calculates the delay correction value given to each of the speakers 11 to 15 based on the
adjustment amount of the image corrected by the operation unit 23, and the operation unit 23.
Various adjustment amounts of the image corrected by the operation unit 23 and the control unit
27 including the gain correction value calculation unit 26 that calculates the gain correction
value to be given to each of the speakers 11 to 15 based on the adjustment amount of the image
And a memory 28 for storing a delay correction value and a gain correction value to be given to
each of the speakers 11 to 15 corresponding to.
[0024]
The delay correction value calculation unit 25 of the control unit 27 receives correction
information including the adjustment amount of the image corrected by the operation unit 23
from the reception unit 24, and is initially supplied from the reference image signal supply unit
22 to the image display means 16. Based on the reference image signal, a delay correction value
to be given to each speaker is calculated.
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[0025]
The gain correction value calculation unit 26 of the control unit 27 receives correction
information including the adjustment amount of the image corrected by the operation unit 23
from the reception unit 24, and is initially supplied from the reference image signal supply unit
22 to the image display means 16. Based on the reference image signal, a gain correction value
to be given to each speaker is calculated.
[0026]
That is, the delay correction value calculation unit 25 and the gain correction value calculation
unit 26 of the control unit 27 receive the signal from the operation unit 23 through the reception
unit 24 and correspond to the sound field information actually output from each speaker By
comparing the reference image signal supplied to the image display means 16 with the
correction information of the reference image corresponding to the current sound field
information actually heard at the listening position, the optimal delay correction value and gain
correction value are obtained. It is calculated.
[0027]
The delay correction value calculation unit 25 and the gain correction value calculation unit 26
of the control unit 27 transfer the calculated delay correction value and gain correction value to
the audio signal processing unit 10.
As shown in FIG. 3, the audio signal processing unit 10 having received the delay correction
value and the gain correction value performs delay processing and gain processing for each
speaker of each channel, and outputs a reference signal or a reproduction signal to each speaker.
.
[0028]
As shown in FIG. 4, the memory 28 includes tables 28a, 28b, 28c, 28d,... Corresponding to
adjustment amounts in the longitudinal direction and in the lateral direction for each of the first
to third sections BA, BB, BC described later. A plurality of delay values and gain values to be
provided to the speakers of the respective channels corresponding to the respective adjustment
amounts in the respective sections and the respective directions are stored.
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The delay correction value calculation unit 25 and the gain correction value calculation unit 26
of the control unit 27 calculate the delay value and the gain value in the memory 28 based on
the correction information of the image received by the reception unit 24 and the reference
image signal. By reading out, it is possible to calculate the delay value and the gain value
according to the correction information.
Although the delay value and the gain value are stored in a plurality of tables in the memory 28
and the control unit 27 reads out the delay value and the gain value from here, the delay value
and the gain value may be calculated independently. Good.
[0029]
In the sound field correction apparatus 1 configured as described above, first, the reference
image and the reference sound before the sound field correction are reproduced from the image
display means 16 and the speakers 11 to 15, and the image display means 16 outputs the
reference image signal. The locus K1 corresponding to is drawn.
Here, the user 8 operates the operation unit 23 while watching the movement K1 of the
reference image in order to realize the movement K1 of the ideal sound image by feeling the
movement K2 of the sound image, and the locus K1 changes to the movement K2 of the sound
image. Operate to match.
Then, the signal of the correction information input by the operation unit 23 is received by the
reception unit 24, and the delay calculated by the delay correction value calculation unit 25 and
the gain correction value calculation unit 26 of the control unit 27 based on this signal. The
correction value and the gain correction value are sent to the audio signal processing unit 10 as
a signal.
The reference voice processed by the audio signal processing unit 10 realizes the movement K1
of the sound image which the user 8 makes ideal using the delay correction value and the gain
correction value obtained in this way.
Here, although it has been described that the output of the reference image, the output of the
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reference sound, and the input by the operation unit 23 are completed at one time, the reference
using the obtained delay correction value and gain correction value is further described. The
configuration may be such that the output of the image, the output of the reference sound, and
the input by the operation unit 23 are performed, and the measurement is repeated plural times.
By repeating the measurement and adjustment a plurality of times, it is possible to perform more
optimal sound field correction.
[0030]
Here, the procedure of the image correction by the operation unit 23 for performing specific
sound field correction by the sound field correction device 1 will be described using FIGS. 5A to
5E.
[0031]
First, when the sound field adjustment is started, first, in the output mode, the image display
means 16 moves the moving object 16a so as to draw a locus K1 as a reference image, for
example, as shown in FIG. The reference sound is output from each of the speakers 11 to 15
simultaneously.
Here, the user 8 senses the sound image indicated by the locus K2 by listening to the reference
voice at the listening position.
That is, the user 8 confirms the locus K1 of the moving object 16a and the locus K2 of the
movement of the sound image of the reference voice.
[0032]
Next, in the setting mode, a locus K1 is displayed on the image display unit 16 as a still image as
shown in FIG. 5 (b).
[0033]
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Here, as shown in FIG. 5C, the user operates the operation unit 23 so that the trajectory K1
matches the trajectory K2 of the sound image actually felt.
Specifically, the display image is divided into several blocks (here, three blocks) and can be set in
each section (each block).
For example, first, the screen right block (third section BC) for Lch is selected, and the right front
end of the image is lowered downward by the adjustment amount CC1 by the key operation of
the operation unit 23.
That is, the operation unit 23 is operated to lower the adjustment amount CC1 so that the
selected reference point C1 of the third section BC comes to the position C2.
Although the display image is divided into three blocks and adjusted by the first to third sections
BA, BB and BC, the number of blocks or the number of sections is limited to this. Absent.
[0034]
Next, a block (second block BB) at the center of the screen for Cch is selected, and as shown in
FIG. 5 (d), the central portion of the image is up by the adjustment amount CB1 by the key
operation of the operation unit 23. increase.
That is, the operation unit 23 is operated to increase the adjustment amount CB1 so that the
selected reference point B1 of the second section BB comes to the position B2.
[0035]
Here, when the locus K1 'obtained by correcting the locus K1 matches the locus K2 of the sensed
sound image, the setting end button is operated to end the setting mode.
If the corrected trajectory K1 'of the trajectory K1 does not yet conform to the trajectory K2 of
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the sound image, each block (each section BA, BB, BC) can be further adjusted.
[0036]
Here, only the second section BB and the third section BC can adjust the locus K1 of the image to
the locus K2 of the sound image only by adjustment in the vertical direction, but the second and
third sections BB, BC In some cases, the trajectories may be aligned by performing the
adjustment in the horizontal direction and the adjustment in the vertical direction and the
horizontal direction of the first section BA, but the detailed description will be omitted here.
[0037]
The adjustment amount CC1 and the adjustment amount CB1 shown in FIG. 5E operated by the
operation unit 23 are transferred to the reception unit 24 simultaneously with the abovedescribed operation, and the image display as described above is performed via the reference
image signal supply unit 22. When the setting end button is operated while being reflected in the
means 16, the adjustment amount CC1 and the adjustment amount CB1, which are the correction
information, are corrected by the delay correction value calculation unit 25 of the control unit 27
and the gain correction via the reception unit 24. The value is transferred to the value calculator
26.
The delay correction value calculation unit 25 and the gain correction value calculation unit 26
give delay to each speaker based on the correction information and the reference image signal
supplied from the reference image signal supply unit 22 to the image display unit 16 at first. The
correction value and the gain correction value are calculated and transferred to the audio signal
processing unit 10.
[0038]
Here, the procedure of performing delay processing and gain adjustment from the adjustment
amount CC1 and the adjustment amount CB1 shown in FIG. 5E will be described in more detail
with reference to FIGS. 2 to 4.
[0039]
As shown in FIG. 2, the delay value and the gain value corresponding to the amount of movement
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are read from the table recorded in advance in the memory 28 from the amount of movement of
the reference point vertically from C1 to C2 in the third section BC.
As shown in FIG. 4 described above, the memory 28 has a table of delay values and gain values
corresponding to the movement amounts, and those corresponding to the movement amounts
are stored in advance.
[0040]
Similarly, the delay value and the gain value are read out from the amount of movement of the
reference point in the first section BA and the second section BB.
[0041]
The respective delay values and gain values obtained in the first to third sections BA, BB, BC are
combined to obtain an overall delay value and gain value corresponding to the vertical movement
of the first to third sections. A table is found.
[0042]
The delay value and the gain value as well as the overall delay value and the gain value are
calculated for the lateral movement of the first to third sections as well as the longitudinal
movement described above.
A table for the horizontal direction is also prepared in the memory 28 as in the table for the
vertical direction described above.
[0043]
It is possible to calculate the true delay correction value and gain correction value by combining
the vertical direction table and the horizontal direction table.
Then, the delay correction and gain correction values are transferred to the audio signal
processing unit 10, and the correction values are reflected.
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[0044]
For example, as shown in FIG. 3, the audio signal processing unit 10 that has received the delay
correction value and the gain correction value outputs a little faster from the Cch speaker than it
outputs from the Rch speaker, and The delay image is corrected so that the Lch speaker outputs
a little later than the Cch speaker, so that the sound image at the listening position can be
undulated by adding a wave to the linear sound image movement. Can be optimized.
Although the delay processing and gain processing of the Rch, Cch, and Lch speakers have been
described here, the same delay processing and gain processing can be performed for the SRch
and SLch speakers.
Further, although the sound pressure level and the delay are corrected here, the present
invention is not limited to this, and the frequency characteristic, the phase characteristic and the
like may be similarly adjusted.
[0045]
As described above, the sound field correction apparatus 1 reproduces the reference video and
audio content at each desired listening position by the user, and aligns the three-dimensional
phase of the video and the sound image according to the guide of the content. Thus, an optimal
sound field is generated at the listening position.
[0046]
Further, in the sound field correction device 1, by making it possible to control the threedimensional phase rotation of sound for each dimension, it is possible to perform optimum
adjustment regardless of the user's listening posture.
Further, in order to interlock with the reference video and the audio, the user can adjust while
visually confirming the sound field processing effect.
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[0047]
Further, the sound field correction device 1 changes the sound image localization according to
the position and posture of the user by matching the change of the image and the localization
(locus) of the sound image, and realizes the optimum sound field correction.
[0048]
In addition, the sound field correction device 1 enables adjustment of sound field characteristics
without providing a dedicated measurement microphone for measuring a sound field, a
microphone connection terminal for the dedicated microphone, a microphone amplifier, and the
like.
[0049]
Next, the procedure of sound field characteristic correction by the above-described sound field
correction apparatus 1 will be described using FIG.
[0050]
First, the user 8 carrying the operation unit 23 stands by at a listening position (listening point)
where the user 8 actually listens to the audio information reproduced from the speakers 11 to
15.
Here, the sound field correction device 1 is operated to start sound field correction (S1).
[0051]
When the start button provided in the sound field correction device 1 is pressed, the reference
sound signal supply unit 21 of the sound field correction device 1 causes the speakers 11 to 15
to output the reference sound, and at the same time, the reference image signal supply unit 22.
Causes the image display means 16 to output a reference image corresponding to the reference
voice as shown in FIG. 5A (S2).
[0052]
Next, on the image display means 16, the locus of the reference image described above is
displayed as a still image as shown in FIG. 5 (b) (S3).
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[0053]
Here, the user operates the display image with the operation unit 23 so as to fit the actual sound,
that is, the sound image (S4).
Specifically, as shown in FIGS. 5C and 5D, the operation unit 23 is operated to adjust the locus
K1 of the display image so as to be the locus K2 of the sound image that is actually heard and
listened. .
[0054]
Next, the control unit 27 adjusts the delay correction value and the gain correction value given to
the speakers 11 to 15 of each channel in accordance with the correction amount of the image
described above (S5).
[0055]
Here, the procedure of adjusting the delay correction value and the gain correction value of the
speakers 11 to 15 of each channel will be described in more detail with reference to FIG.
[0056]
First, when the set section is the first section BA, the amount of movement of the reference point
in the vertical direction, that is, the amount of adjustment is transferred to the memory 28 via
the receiver 24 and the controller 27 (S5-1).
Next, the control unit 27 reads out a table of delay values and gain values corresponding to the
movement amount (S5-2).
Then, the setting section is changed from the first section BA to the second section BB, and the
process returns to S5-1 (S5-3).
By repeating S5-1 to S5-3, the delay values and gain values of the sections BA, BB, and BC are
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determined.
[0057]
Then, tables of delay values and gain values read out in the sections BA, BB, BC are synthesized
(S5-4).
[0058]
Next, the amount of lateral movement of the reference point when the set section is the first
section BA, that is, the adjustment amount is transferred to the memory 28 via the receiving unit
24 and the control unit 27 (S5-5).
Next, the control unit 27 reads a table of delay values and gain values corresponding to the
movement amount (S5-6).
Then, the setting section is changed from the first section BA to the second section BB, and the
process returns to S5-5 (S5-7).
By repeating S5-5 to S5-7, the delay value and the gain value of each section BA, BB, BC are
determined.
[0059]
Then, tables of delay values and gain values read out in the setting sections BA, BB, BC are
synthesized (S5-8).
[0060]
Next, a table of delay values and gain values in the vertical direction and the horizontal direction
is synthesized from S5-4 and S5-8 (S5-9).
[0061]
The overall delay correction value and gain correction value obtained by combining are
transferred to the audio signal processing unit 10, and the delay correction value and gain
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correction value are reflected on the audio signal processing unit 10 (S5-10).
[0062]
As shown in the above S5-1 to S5-10, the delay correction value and the gain correction value of
each channel can be adjusted by adjusting the correction amount of the image.
[0063]
Then, the reference image and the reference sound reflecting the delay and the correction of the
gain amount are output (S6).
[0064]
Here, the user determines whether to perform measurement / adjustment again to perform
correction or to end the measurement mode from the actual sound image and the display image
after correction (S7).
[0065]
As described above, the sound field correction device 1 can perform sound field correction, that
is, can supply reproduction signals to the respective speakers using the delay correction value
and the gain correction value, and output the sound information from the respective speakers. I
assume.
[0066]
The sound field correction apparatus 1 to which the present invention is applied can be set while
the user visually confirms the sound field processing effect by the image display means 16, and a
dedicated microphone and other sound collectors become unnecessary, and the set design is
dedicated It becomes unnecessary to match the electrical characteristics of the sound collector
and set.
[0067]
Further, the sound field correction device 1 to which the present invention is applied can be
easily adjusted while looking at the image displayed on the image display means 16.
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Further, the sound field correction device 1 to which the present invention is applied can
perform the sound field correction in a game sense with the controller by listening to the sound
while watching the image.
Further, the sound field correction device 1 to which the present invention is applied can
perform the best adjustment at that location regardless of the user's listening posture, and make
it possible to perform listening in an environment where it is impossible to face the image.
[0068]
Therefore, the sound field correction device 1 to which the present invention is applied enables
optimum sound field adjustment regardless of the listening posture of the user without providing
a dedicated microphone for measurement for obtaining a desired sound field, etc. It is possible to
adjust while visually confirming the field treatment effect.
[0069]
In addition, the sound field correction device 1 to which the present invention is applied is
arbitrarily and freely given that the constant sound field correction has been performed
according to the position of the user automatically, without being restricted by the position and
posture of the user. It becomes possible to perform sound field correction.
[0070]
It is a block circuit diagram showing composition of a sound field amendment device to which
the present invention is applied.
It is a figure which shows the locus | trajectory of the reference image displayed on the image
display apparatus of the sound field correction apparatus to which this invention is applied, and
the locus | trajectory of the sound image of a reference audio | voice.
It is a figure which shows an example of the delay process and gain process by the audio signal
processing part of the sound field correction | amendment apparatus to which this invention is
applied.
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It is a figure which shows the table of the delay value and gain value which are memorize | stored
in the memory of the sound field correction apparatus to which this invention is applied.
It is a figure which shows the procedure of image correction by the operation part of the sound
field correction apparatus to which this invention is applied, (a) is a figure which shows a
reference image, (b) is a figure which shows the locus | trajectory of a reference image. (C) does
not show the state in which the trajectory of the reference image is corrected according to the
sound image, (d) is a diagram further showing the state in which the trajectory of the reference
image is corrected, (e) It is a figure which shows the locus | trajectory of a reference image, the
locus | trajectory of a sound image, and the amount of image correction.
It is a flowchart for demonstrating the procedure of the sound field correction | amendment by
the sound field correction | amendment apparatus to which this invention is applied.
FIG. 7 is a flowchart for describing in further detail the procedure of calculating the delay
correction value and the gain correction value among the procedures shown in FIG. 6.
Explanation of sign
[0071]
Reference Signs List 1 sound field correction device, 9 indoor environment, 10 audio signal
processing unit, 11 to 15 speakers, 16 image display means, 21 reference audio signal supply
unit, 22 reference image signal supply unit, 23 operation unit, 24 reception unit, 25 delay
Correction value calculation unit, 26 Gain correction value calculation unit, 27 control unit, 28
memory
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