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JP2014165569

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DESCRIPTION JP2014165569
Abstract: To provide an "on-vehicle audio system and a computer program" for outputting voice
so that the user can listen to voices of different sound sources with high quality and good for
each area. A front speaker set 7, a rear speaker set 8, a front seat shoulder speaker set 9
disposed near a front seat headrest, and a rear seat shoulder speaker set 10 disposed near a rear
seat headrest are provided. The audio output with the front source as the sound source when the
2-zone mode is set is the high / low range component output from the front speaker set 7 and
the mid range component output from the front seat shoulder speaker set 9, and the rear source
The output of the sound whose sound source is a sound source is a high / low frequency
component output from the rear speaker set 8 and a middle frequency component output from
the rear seat shoulder speaker set 10. [Selected figure] Figure 2
Car audio system and computer program
[0001]
The present invention is a technology for outputting voice of each sound source in a car-mounted
audio system mounted on a car so that a user in each area in the car can listen favorably to the
sound of a different sound source in each area. It is about
[0002]
In a car-mounted audio system mounted on a car, as a technology for outputting the sound of
each sound source, the user in each area in the car can listen favorably to the sound of the sound
source different for each area. A speaker and a rear speaker, an FH speaker provided in the
vicinity of a headrest of a front seat, and an RH speaker provided in the vicinity of a headrest of a
rear seat. When outputting the sound of the sound source for the rear seat to the user of the rear
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seat, output the sound in which the high band and the low band of the sound source for the front
seat are attenuated to the front speaker and the FH speaker, and the rear speaker and the RH
There is known a technology for outputting, as a speaker, a voice in which the high and low
frequencies of a sound source for the rear seat are attenuated (for example, Patent Document 1).
[0003]
JP 2002-264732 A
[0004]
The above-described front speaker and FH speaker output voices in which the high frequency
band and low frequency band of the sound source for the front seat are attenuated, and the rear
speaker and RH speaker output high frequency and low band of the sound source for rear seat
According to the technology that outputs voice with attenuated voice, only the voice with high
frequency and low frequency of the sound source attenuated is output to the users at each seat,
and the voice that the user listens to is mainly in the middle frequency band It has low quality
voice with only
That is, according to this technology, for example, when the sound of the sound source is music,
the music the user listens to must be poor including only mid-range sound.
[0005]
In addition, since the sound output from the rear speaker also reaches the front seat and the
sound output from the front speaker also reaches the rear seat, according to this technology,
deterioration in the recognition of auditory perception is degraded. In the midrange where the
influence is large, it is not possible to sufficiently exclude that the sound of the sound source for
the front seat and the sound of the sound source for the rear seat are mixed and the user of each
seat can hear it. The user of may not be able to listen well to the sound of the sound source for
the seat.
[0006]
Therefore, according to the present invention, in the on-vehicle audio system mounted in a car,
the respective sound sources can be used to allow each user in each area in the car to listen to
voices of sound sources different for each area with higher quality and better The task is to
output voices of
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[0007]
In order to achieve the above object, according to the present invention, an audio system
mounted on a car is disposed at a front speaker disposed in the front of the cabin, a rear speaker
disposed at the rear of the cabin, and a position near the front seat. Front seat speaker, a rear
seat speaker disposed at a position near the rear seat, a front voice processing unit that adjusts
the frequency characteristic of sound and outputs it to the front speaker, adjusts the frequency
characteristic of sound, and the rear Rear voice processing unit outputting to the speaker, front
seat voice processing unit adjusting the frequency characteristic of voice and outputting it to the
front seat speaker, and rear seat voice adjusting the frequency characteristic of voice and
outputting it to the rear seat speaker When the processing unit and the control unit are provided,
and different sound sources are set as the sound source for the front seat user and the sound
source for the rear seat user, the front audio processor in the control unit Adjusting the
frequency characteristic by the gain characteristic for attenuating a predetermined frequency
band of the sound output from the user's sound source, and outputting the adjusted sound to the
front speaker, and the front seat audio processing unit Adjustment of frequency characteristics
by gain characteristics for attenuating frequency bands other than the predetermined frequency
band of the voice output from the sound source for the front seat user by a gain characteristic,
and the adjusted voice Adjustment of frequency characteristics by gain characteristics for
causing output to the front seat speaker and causing the rear audio processing unit to attenuate
the predetermined frequency band of voice output from the sound source for the rear seat; The
voice after the adjustment is output to the rear speaker, and the predetermined frequency band
of the voice output from the sound source for the rear seat user to the rear seat voice processing
unit. And adjustment of the frequency characteristics by the gain characteristics to greatly
attenuate than the outer frequency bands the predetermined frequency band, in which so as to
perform output to the front-seat speaker for audio after the adjustment.
[0008]
Here, in such an on-vehicle audio system, the predetermined frequency band may be a frequency
band constituting a mid-range of voice or a part of the band.
Alternatively, the predetermined frequency band may be a band having a frequency between Hz
and Hz as a center frequency on a logarithmic frequency axis.
Alternatively, the predetermined frequency band may be a band having Hz as a center frequency
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on a logarithmic frequency axis.
Alternatively, the predetermined frequency band may be a band between Hz and kHz.
[0009]
Further, in the above-described on-vehicle audio system, the front seat speaker may be disposed
at a position near the headrest of the front seat, and the rear seat speaker is near the headrest of
the rear seat. It may be disposed at a position.
Alternatively, the front seat speaker may be disposed at least one on each side of the headrest of
the front seat, and the rear seat speaker may be at least one on each side of the headrest of the
rear seat. It may be arranged.
[0010]
According to such an on-vehicle audio system, when different sound sources are set as the sound
source for the front seat user and the sound source for the rear seat user, predetermined sound
of the sound source for the front seat user from the front speaker is set. A voice whose frequency
band is attenuated is output, and a voice whose sound source other than the predetermined
frequency band of the voice of the sound source for the front seat user is attenuated more than
the predetermined frequency band is output from the front seat speaker At the same time, the
rear speaker outputs a voice in which the predetermined frequency band of the voice of the
sound source for the rear seat is attenuated, and the rear seat speaker outputs the voice other
than the predetermined frequency band of the voice for the sound source for the rear seat And a
voice whose frequency band is attenuated more than the predetermined frequency band.
[0011]
Here, the front seat speaker is a speaker dedicated to the user seated in the front seat, and the
output volume is set to be relatively small because it is arranged in the vicinity of the front seat
and hence in the vicinity of the user seated in the front seat. The seat speaker is a speaker
dedicated to the user seated in the rear seat, and the output volume is set to be relatively small
because it is disposed in the vicinity of the rear seat and in the vicinity of the user seated in the
rear seat.
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Therefore, with these settings, the sound output from the front seat speaker does not reach the
rear seat user, and the sound output from the rear seat speaker does not reach the front seat
user.
In addition, the front seat speaker does not have a problem even if it has strong directivity in the
front seat user direction, and the rear seat speaker has a problem even if it has strong directivity
in the rear seat user direction Absent. And, by providing directivity in this way, the sound output
from the front seat speaker does not reach the rear seat user more effectively, and the sound
output from the rear seat speaker reaches the front seat user It can be avoided.
[0012]
In addition, the predetermined frequency band can be set to a mid range of voice, whereby for
the front seat user, the voice heard by the front seat user is output from the front speaker for the
front seat user For high- and low-frequency components of the sound source of the sound source,
mid-range components of the sound of the sound source for the front seat user output from the
front seat speaker, and for the rear seat user who sounds small because it is output from the far
rear speaker High and low frequency components of the voice of the sound source. Here, the
front seat is added by adding high- and low-frequency components of the sound of the sound
source for the front seat user output from the front speaker and mid-range components of the
sound for the front seat user output from the front seat speaker The user of can hear the sound
of the sound source for the front seat user with the complete frequency band. Therefore, the
front seat user can listen to the sound of the sound source for the front seat user with high
quality. In addition, since the front seat user does not hear the sound source for the rear seat
user in the middle region where the influence on the deterioration of the auditory recognition
quality is large, the sound source for the front seat user is You will be able to listen to the sound
well.
[0013]
Similarly, for the user at the rear seat, the sound heard by the user at the rear seat is output from
the high and low frequency components of the sound of the sound source for the rear seat user
output from the rear speaker and the speaker for the rear seat It is the mid-range component of
the sound of the sound source for the rear seat user, and the high and low frequency component
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of the sound of the sound source for the front seat user that sounds small because it is output
from the far front speaker. Here, the rear seat is obtained by adding the high and low frequency
components of the sound of the sound source for the rear seat user output from the rear speaker
and the mid-range component of the sound for the rear seat user sound output from the rear seat
speaker The user of this system will hear the sound of the rear source whose entire frequency
band is complete. Therefore, the rear seat user can listen to the sound of the sound source for the
rear seat user with high quality. In addition, since the rear seat user does not hear the sound
source for the front seat user in the midrange where the influence on the deterioration of the
auditory recognition quality is large, the sound source for the rear seat user is You will be able to
listen to the sound well.
[0014]
In the on-vehicle audio system as described above, when a common sound source is set for the
front seat user and the rear seat user in the control unit, the front sound processing unit uses the
common sound source. Adjustment of the frequency characteristic by a predetermined gain
characteristic prepared for the case where a common sound source is set for the front seat user
and the rear seat user of the sound to be output, and the above-mentioned sound after the
adjustment The output to the front speaker is performed, the output of the sound to the front
seat speaker of the front seat audio processing unit is suppressed, and the predetermined state of
the audio output from the common sound source to the rear audio processing unit Adjustment of
the frequency characteristic by the gain characteristic of the second embodiment and output of
the adjusted voice to the rear speaker, and the output of the voice to the rear seat speaker of the
rear seat audio processing unit is suppressed. May be
[0015]
Further, a subwoofer speaker is provided in the above-described in-vehicle audio system, and
when different sound sources are set as the sound source for the front seat user and the sound
source for the rear seat user in the control unit, the subwoofer speaker The output is suppressed,
and when a common sound source is set for the front seat user and the rear seat user, the sound
output from the common sound source is configured to be output from the subwoofer speaker It
is also good.
[0016]
As described above, according to the present invention, in the on-vehicle audio system mounted
in a car, each user in each area in the car can listen to the sound of the sound source different for
each area with higher quality and better Thus, the sound of each of the sound sources can be
output.
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[0017]
It is a block diagram showing composition of an audio system concerning an embodiment of the
present invention.
FIG. 1 shows an arrangement of an audio system according to an embodiment of the present
invention.
It is a figure which shows the audio output setting table which concerns on embodiment of this
invention.
It is a figure which shows the gain characteristic of the mid region attenuation ¦ damping pattern
which concerns on embodiment of this invention, and high-low region attenuation ¦ damping
pattern. It is a flow chart which shows audio output setting control processing concerning an
embodiment of the present invention.
[0018]
Hereinafter, embodiments of the present invention will be described. FIG. 1 shows the
configuration of an AV (audio visual) system according to the present embodiment. Here, the AV
system according to the present embodiment is an AV system mounted in a car, and as shown in
the figure, a plurality of video source devices 1 for outputting video such as a TV receiver and a
video disc player, a radio receiver A plurality of audio source devices 2 for outputting audio such
as audio disc players, an input device 3, a control unit 4, a front display 5, a rear display 6, a
front speaker set 7, a rear speaker set 8, each seat of a front seat (driver's seat And a front seat
shoulder speaker set 9 provided for each front passenger seat, a rear seat shoulder speaker set
10 provided for each rear seat, and a subwoofer speaker 11.
[0019]
Here, the front speaker set 7, the rear speaker set 8, the front seat shoulder speaker set 9, and
the rear seat shoulder speaker set 10 are each a pair of a speaker for the R (right) channel and a
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speaker for the L (left) channel. Composed of speakers. Here, as shown in FIGS. 2a and 2b, the
control unit 4, the video source device 1 and the audio source device 2 are installed in the
dashboard of the car, and the front display 5 displays the dashboard on the dashboard to the
front seat user. It is arranged exposed to face. In addition, the rear display 6 is installed on the
ceiling between the front and rear seats with the display surface facing the user of the rear seat.
Further, the input device 3 is, for example, a touch panel disposed on the display surface of the
front display 5 in an overlapping manner, a remote controller, or the like.
[0020]
Further, the speaker 71 for the R channel of the front speaker set 7 is disposed at the front right
door, and the speaker 72 for the L channel of the front speaker set 7 is disposed at the front left
door. In addition, the speaker 81 for the R channel of the rear speaker set 8 is disposed at a
position slightly behind the rear right door in the car, and the speaker 82 for the L channel of the
Lant's speaker set is a little behind the rear left door in the car It is placed in position. Further,
the subwoofer speaker 11 is disposed in the rear luggage compartment.
[0021]
Also, the front seat shoulder speaker set 9 is provided corresponding to each front seat, and as
shown in FIG. 2c, the R channel speaker 91 of the front seat shoulder speaker set 9 is on the
right side of the headrest of the corresponding seat The speaker 92 for the L channel of the front
seat shoulder speaker set 9 is disposed with the left front facing diagonally forward, and is
arranged with the right front facing diagonally to the left of the headrest.
[0022]
The rear seat shoulder speaker set 10 is provided corresponding to each seat of the rear seat,
and similarly to the front seat shoulder speaker set 9, the R-channel speakers 101 of the rear
seat shoulder speaker set 10 are headrests of corresponding seats The speaker 102 for the L
channel of the rear seat shoulder speaker set 10 is disposed on the left side of the headrest so as
to face the right front.
[0023]
Referring back to FIG. 1, the control unit 4 decodes the video data and audio data from the
encoded video data input from the video source device 1 by two video decoders 401 and the
encoded audio data input from the bi-audio source device. Two audio decoders 402 that decode
audio data from the control unit 403, a front video processing unit 410 that performs adjustment
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processing etc. on the video represented by the video data input from the video decoder 401, and
outputs it to the front display 5; It corresponds to the rear image processing unit 411 which
performs adjustment processing etc. on the image represented by the image data to be input and
outputs it to the rear display 6, the front sound processing unit 412 provided corresponding to
the front speaker set 7, and the rear speaker set 8 Rear voice processing unit 13, front seat
shoulder voice processing unit 414 provided corresponding to the front seat shoulder speaker
set 9, rear seat shoulder voice processing unit 415 provided corresponding to the rear seat
shoulder speaker set 10, and subwoofer voice processing unit 416 Have.
[0024]
The front audio processing unit 412 includes two sets of an equalizer (EQ) 421, a DA converter
(DAC) 422, and an amplifier 423 for R channel and L channel.
Then, the set for R channel of the front audio processing unit 412 is the equalizer 421, and the
frequency characteristic of the R channel audio data output from the video decoder 401 or the
audio decoder 402 to the front audio processing unit 412 from the control unit 403 After
changing with the specified gain characteristics, it is converted to an analog audio signal by the
DA converter 422, and the converted analog audio signal is amplified by the amplifier 423 at the
amplification factor specified by the control unit 403 and used for the R speaker of the front
speaker Output to the speaker 71 of FIG.
Also, the L channel set of the front audio processing unit 412 is the equalizer 421 which controls
the frequency characteristics of the L channel audio data output from the video decoder 401 or
the audio decoder 402 to the front audio processing unit 412 from the controller 403. After
changing with the specified gain characteristics, it is converted to an analog audio signal by the
DA converter 422, and the converted analog audio signal is amplified by the amplifier 423 at the
amplification factor specified by the control unit 403 and used for the L channel of the front
speaker Output to the speaker 72 of FIG.
[0025]
Next, the rear voice processing unit 413, the front seat shoulder voice processing unit 414, and
the rear seat shoulder voice processing unit 415, as well as the front voice processing unit 412,
are a set of the equalizer 421, the DA converter (EQ) 422 and the amplifier 423. , And two sets
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for R channel and for L channel.
The rear voice processing unit 413, the front seat shoulder voice processing unit 414, and the
rear seat shoulder voice processing unit 415 respectively have frequency characteristics of audio
data of R / L channels output to the video decoder 401 or the audio decoder 402. Are changed
by the gain characteristic designated by the control unit 403, converted to an analog voice signal,
amplified by the amplification factor designated by the control unit 403, and R / L of the
corresponding speaker set. Output to the channel speaker.
[0026]
However, since the front seat shoulder speaker set 9 and the rear seat shoulder speaker set 10
are arranged near the user's ear, the loudness of the sound output from the front seat shoulder
speaker set 9 or the rear seat shoulder speaker set 10 It is necessary to make the size smaller
than the size of the sound outputted from the front speaker set 7 and the rear speaker set 8.
Therefore, the control unit 403, for example, outputs the amplification factors of the amplifier
423 of the front seat shoulder voice processing unit 414 and the rear seat shoulder voice
processing unit 415 as voices output from the front seat shoulder speaker set 9 and the rear seat
shoulder speaker set 10. Are set so as to be smaller than the size of the sound output from the
front speaker set 7 and the rear speaker set 8 at a constant ratio.
[0027]
Further, the subwoofer audio processing unit 416 includes a DA converter and an amplifier 422,
amplifies the audio represented by the audio data output from the audio decoder 402 at an
amplification factor specified by the control unit 403, and outputs it to the subwoofer speaker
11. Do. The audio band outputted by the subwoofer speaker 11 is only the low band. However, in
terms of hardware, the above control unit 4 may be configured using a computer having a
general configuration including a microprocessor, a memory, and other peripheral devices. In
this case, the video decoder 401 The audio decoder 402, the control unit 403, and the equalizer
421 of each sound processing unit may be realized by the microprocessor executing a prepared
program.
[0028]
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Now, in such a configuration, the audio system is provided with a 1 zone mode and a 2 zone
mode as operation modes. Then, the control unit 403 performs processing of switching the
operation mode between the 1 zone mode and the 2 zone mode in accordance with the user
operation accepted by the input device 3. Further, the control unit 403 performs processing of
switching the source device (the video source device 1 or the audio source device 2) to be set as
the source according to the user operation received by the input device 3. Here, when the 1 zone
mode is set as the operation mode, only the common source can be set as the source, and the
control unit 403 responds to the user operation accepted by the input device 3 One of the video
source devices 1 or the audio source device 2 is set as a common source. Also, when the 2 zone
mode is set as the operation mode, there are two sources that can be set as the source: front
source and rear source, and the control unit 403 receives the user operation accepted by the
input device 3. Accordingly, either video source device 1 or audio source device 2 is set as a front
source, and either video source device 1 or audio source device 2 is selected according to the
user operation accepted by input device 3. Set as rear source. However, setting the same device
(video source device 1 or audio source device 2) as the front source and the rear source is
prohibited.
[0029]
Hereinafter, the control operation of the audio output setting performed by the control unit 403
according to the setting of the operation mode and the source will be described. First, an audio
output setting table set in advance in the control unit 403 for control of audio output setting will
be described. FIG. 3 shows the contents of the audio output setting table. As illustrated, in the
audio output setting table, the presence / absence of output of each audio processing unit, the
source, and the setting of the equalizer 421 are registered for each of the 1 zone mode and the 2
zone mode. Here, the presence or absence of the output indicates the setting as to whether or not
the audio processing unit is to output the audio, and the source is audio data to be input to the
audio processing unit, that is, a speaker / speaker set corresponding to the audio processing unit
It represents the setting of the source of the sound to be output, and the equalizer setting
represents the setting of the gain characteristic of the equalizer 421 of the sound processing
unit.
[0030]
That is, as shown in the figure, in the audio output setting table, in the 1 zone mode, the front
audio processing unit 412, the rear audio processing unit 413, and the subwoofer audio
processing unit 416 output audio of audio data whose sound source is a common source. It is
registered that the front seat shoulder voice processing unit 414 and the rear seat shoulder voice
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processing unit 415 do not perform voice output.
[0031]
Further, in the audio output setting table, it is registered that the gain characteristics of the
equalizer 421 of the front sound processing unit 412 and the rear sound processing unit 413 are
set to the standard gain characteristics in the one-zone mode.
Here, the standard gain characteristic is a gain characteristic in which the gain is uniform (flat)
over the entire frequency band, or a gain characteristic separately set by the user for the one
zone mode.
[0032]
Also, in the audio output setting table, in the two-zone mode, the front audio processing unit 412
and the front seat shoulder audio processing unit 414 perform audio output of audio data using
the front source as a sound source. It is registered that the rear seat shoulder audio processing
unit 415 outputs audio of audio data using a rear source as a sound source, and the subwoofer
audio processing unit 416 does not output audio.
[0033]
Also, in the audio output setting table, the gain characteristics of the equalizer 421 of the front
audio processing unit 412 and the rear audio processing unit 413 are set to the gain
characteristics of the mid-range attenuation pattern and the front seat shoulder audio processing
It is registered that the gain characteristics of the equalizer 421 of the section 414 and the rear
seat shoulder voice processing unit 415 are set as the gain characteristics of the high and low
frequency attenuation patterns.
[0034]
Here, the gain characteristic of the midrange attenuation pattern is a gain characteristic for
attenuating the midrange frequency band, and for example, as shown at 301 in FIG. 4a, Hz-3 kHz
with the center frequency on the logarithmic frequency axis as Hz. It is a gain characteristic that
attenuates the middle frequency band.
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Further, the gain characteristic of the high / low frequency attenuation pattern is a gain
characteristic for attenuating the high / low frequency band other than the middle frequency, for
example, as shown by 302 in FIG. It is a gain characteristic that attenuates the band.
That is, for the gain characteristic 301 of the mid-range attenuation pattern for attenuating the
mid-range frequency band of Hz-3 kHz, the high- and mid-range other than the mid-range
frequency band of Hz-3 kHz is used as the gain characteristic of the high-low band attenuation
pattern. Use a gain characteristic that attenuates the frequency band of
[0035]
More specifically, the gain characteristics of the high-low range attenuation pattern may be
determined and set in advance as follows experimentally. That is, for example, the test voice is
output only from the front speaker set 7 with the gain characteristic of the equalizer 421 of the
front audio processing unit 412 as the flat gain characteristic, and the sound at the position
where the user's ear sitting in the front seat is arranged The frequency spectrum of pressure is
measured to provide a reference frequency spectrum (e.g., 310 of FIG. 4b).
[0036]
Then, using the gain characteristic of the equalizer 421 of the front sound processing unit 412 as
the gain characteristic of the mid-range attenuation pattern, change the gain characteristic of the
front seat shoulder sound processing unit 414 while outputting the test music from the front
speaker set 7 While the front seat shoulder speaker set 9 also outputs the test music, the
frequency spectrum of the sound pressure (for example, 311 in FIG. 4 b) at the position where
the user's ear sitting in the front seat is arranged is the most reference frequency spectrum The
gain characteristic of the front seat shoulder voice processor 414 when it is approximated is set
as the gain characteristic of the high-low range attenuation pattern used for the equalizer 421 of
the front seat shoulder voice processor 414.
[0037]
Similarly, with the gain characteristic of the equalizer 421 of the rear sound processing unit 413
as the flat gain characteristic, the test music is output only from the eight rear speaker sets, and
the user's ear sitting at the rear seat is arranged The sound pressure frequency spectrum is
measured and used as a reference frequency spectrum.
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[0038]
Then, with the gain characteristic of the equalizer 421 of the rear sound processing unit 413 as
the gain characteristic of the mid-range attenuation pattern, the gain characteristic of the rear
seat shoulder sound processing unit 415 is changed while outputting the test music from the
rear speaker set 8 While the rear seat shoulder speaker set 10 also outputs the test music, the
rear seat shoulder when the frequency spectrum of the sound pressure at the position where the
user's ear sitting in the rear seat is located is closest to the reference frequency spectrum The
gain characteristic of the audio processing unit 415 is set as the gain characteristic of the highlow range attenuation pattern used for the equalizer 421 of the rear seat shoulder audio
processing unit 415.
[0039]
Hereinafter, the audio output setting control process performed by the control unit 403 will be
described using such an audio output setting table.
FIG. 5 shows the procedure of the audio output setting control process.
As shown, in this process, occurrence of a change in either the operation mode or the setting of
the source is monitored (step 502), and when the change occurs, a decoder is assigned to each
source (step 502).
That is, in step 504, if the operation mode is one zone mode and the common source is the video
source device 1, one video decoder 401 is assigned to the common source and the video output
from the common source to the assigned video decoder 401 If video data and audio data are
decoded from data, and the operation mode is 1 zone mode and the common source is the audio
source device 2, one audio decoder 402 is assigned to the common source and the common
source is assigned to the assigned audio decoder 402 Audio data from the encoded audio data
output from
[0040]
Also, in step 504, if the operation mode is the two zone mode and the front source is the video
source device 1, one video decoder 401 is assigned to the front source and the video output from
the front source to the assigned video decoder 401 If video data and audio data are decoded
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from data, and the operation mode is 2 zone mode and the front source is the audio source
device 2, one audio decoder 402 is assigned to the front source, and the assigned front to the
audio decoder 402 Audio data from the encoded audio data output from
[0041]
In step 504, if the operation mode is the two zone mode and the rear source is the video source
device 1, one video decoder 401 not assigned to the front source is assigned to the rear source
and output from the rear source to the assigned video decoder 401 Video and audio data from
the video data to be recorded, and if the operation mode is the two zone mode and the rear
source is the audio source device 2, one audio decoder 402 not assigned to the front source is
assigned to the rear source and assigned The audio decoder 402 decodes the audio data from the
encoded audio data output from the rear source.
[0042]
Then, according to the operation mode, the source setting, and the audio output setting table, the
input to each video processing unit and each audio processing unit is set (step 506).
That is, in step 506, when the operation mode is 1 zone mode and the common source is the
video source device 1, the front video processing unit 410 and the rear video of the video data
decoded by the video decoder 401 allocated to the common source It controls the start of output
to the processing unit 411 and controls the start of output of audio data decoded by the video
decoder 401 assigned to the common source to the front audio processing unit 412, rear audio
processing unit 413, and subwoofer audio processing unit 416. .
When the operation mode is one zone mode and the common source is the audio source device
2, the front sound processing unit 412 and rear sound processing unit 413 of the audio data
decoded by the audio decoder 402 allocated to the common source are The start of output to the
subwoofer audio processing unit 416 is controlled.
[0043]
In step 506, when the operation mode is the two zone mode and the front source is the video
source device 1, the output of the video data decoded by the video decoder 401 assigned to the
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front source to the front video processing unit 410 It controls the start, and also controls the
start of output of audio data decoded by the video decoder 401 assigned to the front source to
the front sound processing unit 412 and the front seat shoulder sound processing unit 414.
When the operation mode is the two-zone mode and the front source is the audio source device
2, the front audio processor 412 for the audio data decoded by the audio decoder 402 assigned
to the front source, and the front seat shoulder audio processor Control the start of output to
414.
[0044]
In step 506, when the operation mode is the two zone mode and the rear source is the video
source device 1, the output of the video data decoded by the video decoder 401 assigned to the
rear source to the rear video processing unit 411 is started. While controlling, it also controls the
start of outputting the audio data decoded by the video decoder 401 assigned to the rear source
to the rear audio processing unit 413 and the rear seat shoulder audio processing unit 415.
When the operation mode is 2 zone mode and the rear source is the audio source device 2, to the
rear audio processing unit 413 and rear seat shoulder audio processing unit 415 of the audio
data decoded by the audio decoder 402 assigned to the rear source Control the output start of
[0045]
Then, next, according to the operation mode and the audio output setting table, the output
presence / absence of each audio processing unit and the gain characteristic of the equalizer 421
are set (step 508), and the process returns to step 502. That is, in step 508, if the operation
mode is the 1 zone mode, the front seat shoulder voice processor 414 and the rear seat shoulder
voice processor 415 are set to no output, and the other voice processors are set to be output.
Standard gain characteristics are set as the gain characteristics of the equalizer 421 of the front
sound processing unit 412 and the rear sound processing unit 413. Here, the audio processing
unit whose output non-existence is set suppresses audio output, and the audio processing unit
whose output presence is set does not suppress audio output. Note that the suppression of the
audio output can be realized, for example, by setting the output of the amplifier 423 or the like.
[0046]
In step 508, if the operation mode is the two zone mode, the subwoofer audio processing unit
416 is set to no output, and the other audio processing units are set to output, and the front
audio processing unit 412 and rear audio processing are set. The gain characteristic of the mid-
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range attenuation pattern is set as the gain characteristic of the equalizer 421 of the unit 413,
and the gain characteristic of the high / low-pass attenuation pattern is set as the gain
characteristic of the front seat shoulder audio processor 414 and the rear seat shoulder audio
processor 415. .
[0047]
The audio output setting control process performed by the control unit 403 has been described
above.
According to the audio output setting control process as described above, when the 1 zone mode
is set as the operation mode, the video source device 1 or the audio source set as the common
source from the front speaker set 7 and the rear speaker set 8 A sound whose source is the
device 2 is output after the frequency characteristic is adjusted with a standard gain
characteristic, and a low frequency component of the sound whose source is a common source is
output from the subwoofer speaker 11. At this time, no sound is output from the front seat
shoulder speaker set 9 and the rear seat shoulder speaker set 11.
[0048]
On the other hand, when the 2 zone mode is set as the operation mode, from the front speaker
set 7 and the front seat shoulder speaker set 9, the sound sourced from the video source device 1
or the audio source device 2 set as the front source The sound is output from the rear speaker
set 8 and the rear seat shoulder speaker set 10 as sound sources with the video source device 1
or the audio source device 2 set as the rear source as a sound source. At this time, no sound is
output from the subwoofer speaker 11.
[0049]
Also, the output of the sound with the front source as the sound source when the 2-zone mode is
set in this way is the high and low frequency components output from the front speaker set 7
and the middle seat output from the front seat shoulder speaker set 9 It becomes a regional
component. Also, the audio output with the rear source as the sound source when the 2-zone
mode is set is the high / low range component output from the rear speaker set 8 and the mid
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range component output from the rear seat shoulder speaker set 10 .
[0050]
Further, the front seat shoulder speaker set 9 is a speaker dedicated to the user seated in the
front seat, and the output volume is set to be relatively small because it is arranged in the vicinity
of the ear of the user seated in the front seat. Further, the rear seat shoulder speaker set 10 is a
speaker dedicated to the user seated in the rear seat, and the output volume is set to be relatively
small because it is disposed in the vicinity of the ear of the user seated in the rear seat. And for
this reason, the audio ¦ voice output from the front seat shoulder speaker set 9 hardly reaches
the user of a backseat, and the audio ¦ voice output from the rear seat shoulder speaker set 10
hardly reaches the user of a front seat. Also, even if the front seat shoulder speaker set 9 has
strong directivity in the direction of the front seat user, no inconvenience occurs, and even if the
rear seat shoulder speaker set 10 has strong directivity in the rear seat user direction There is no
inconvenience. And by giving directivity in this way, the voice output from the front seat
shoulder speaker set 9 does not reach the user of the rear seat more effectively, and the voice
output from the rear seat shoulder speaker set 10 is more effective. It can be prevented from
reaching the front seat user. Therefore, as described above, the front seat user hardly hears the
mid-range component of the rear source voice output from the rear seat shoulder speaker set 10,
and the voice heard by the front seat user is output from the front speaker set 7 High- and lowfrequency components of the front-source voice, mid-range components of the front-source voice
output from the front seat shoulder speaker set 9, and high-and-low voice of the rear source
sound that is small because it is output from the far rear speaker set 8 It becomes a regional
component. Here, the user of the front seat is all added to the front seat user by adding the high
and low frequency components of the front source sound output from the front speaker set 7
and the mid range components of the front source sound output from the front seat shoulder
speaker set 9. The sound of the front source whose frequency band is aligned will be heard.
Therefore, the front seat user can listen to the sound of the front source with high quality. In
addition, the front-seat user can hear the front-source voice well, because the rear-source voice
can not be heard in the midrange that has a large influence on the deterioration of the goodness
of auditory recognition. .
[0051]
Similarly, the rear seat user hardly hears the mid-range component of the front source voice
output from the front seat shoulder speaker set 9, and the voice heard by the rear seat user is
output from the rear speaker set 8. High and low frequency components of the rear source
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sound, mid frequency components of the rear source sound output from the rear seat shoulder
speaker set 10, and high and low frequency components of the front source sound that sounds
small because it is output from the far front speaker set 7 It becomes. Here, by adding the highand low-frequency components of the rear source voice output from the rear speaker set 8 and
the mid-range components of the rear source voice output from the rear seat shoulder speaker
set 10 to the rear seat user You will hear the sound of the rear source with Therefore, the rear
seat user can listen to the sound of the rear source with high quality. In addition, since the rear
seat user can not hear the sound of the front source about the midrange that has a large
influence on the deterioration of the goodness of auditory recognition, he can hear the sound of
the rear source well. .
[0052]
Note that when the 2-zone mode is set, the high- and low-frequency component audio output
from the front and rear speakers is Hz- centered on the Hz of the sound of the sound source
using the gain characteristics of the mid-range attenuation pattern. The voice with the 3 kHz
frequency band component attenuated means that this frequency band contains many voice
components that are the most meaningful or main targets of listening to listeners such as musical
vocals and melody parts of musical instruments. When voices in different frequency bands of
different sound sources are mixed, the goodness of listening to the voices of the respective sound
sources is greatly deteriorated. That is, by excluding the sound component in the frequency band
of Hz-3 kHz centered on Hz from the sound of high and low frequency components output from
the front speaker and the rear speaker, the main object of the meaning or listening main for the
user For the frequency band where the sound heard by the user is a mixture of sounds from
different sound sources, and for the frequency band, the sound from the sound source for which
the user is listening for the sound heard by the user Can only be.
[0053]
However, the center frequency (on the logarithmic frequency axis) of the attenuation of such a
midrange attenuation pattern does not necessarily have to be exactly Hz, and the center
frequency of the attenuation characteristic of the midrange attenuation pattern is approximately
Hz to 800 Hz. It may be any frequency between. The embodiments of the present invention have
been described above. The above embodiment uses a speaker set disposed at an arbitrary
position near the front seat instead of the front seat shoulder speaker set 9, or is disposed at an
arbitrary position near the rear seat instead of the rear seat shoulder speaker set 10. A speaker
set may be used.
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[0054]
Reference Signs List 1 video source device 2 audio source device 3 input device 4 control unit 5
front display 6 rear display 7 front speaker set 8 rear speaker set 9 front shoulder speaker Set
10 10 Rear seat shoulder speaker set 11 Subwoofer speaker 401 Video decoder 402 Audio
decoder 403 Control unit 410 Front video processing unit 411 Rear video processing unit 412
Front audio processing unit , 413: rear voice processing unit, 414: front seat shoulder voice
processing unit, 415: rear seat shoulder voice processing unit, 416: subwoofer voice processing
unit, 421: equalizer, 422: DA converter, 423: amplifier.
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