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JP2010056846

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DESCRIPTION JP2010056846
In an audio system including a playback device, a display device disposed apart from the
playback device, and a plurality of speakers commonly used in the playback device and the
display device, the sound source of the speaker is the playback device Provided is a technology
for reducing the difference between an image displayed on a display device and an audio output
from a speaker when switched between the display device and the display device. An operation
information acquisition unit acquires operation information related to an operation state of a
display device, and activation of the display device is detected based on the operation
information, and the display device is displayed when the display device is activated. An acoustic
processing unit for adjusting audio signals supplied to the plurality of speakers such that the
image and the audio corresponding to the image are integrally supplied to a viewer who views
the image . [Selected figure] Figure 3
Audio signal processing apparatus, audio signal processing method, and audio system
[0001]
The present invention relates to an audio signal processing device, an audio signal processing
method, and an audio system.
[0002]
In a closed space such as a vehicle space, technology development has been advanced to provide
a listener with a more optimal sound field.
09-05-2019
1
For example, Patent Document 1 discloses a technology relating to an on-vehicle AV device, and
the on-vehicle AV device includes a plurality of speakers disposed in the vehicle, a plurality of
displays disposed in the vehicle, and a plurality And a control circuit that corrects an audio signal
supplied to the speaker of FIG. Then, in the in-vehicle AV device, the control circuit detects the on
/ off of the power of each of the plurality of displays, and the reproduction sound of the plurality
of speakers is turned on among the plurality of displays according to the detection result. The
correction circuit is controlled to be appropriate at the position where the display is used. Thus,
according to the on-vehicle AV device described in Patent Document 1, an appropriate
reproduction sound field is provided regardless of the seating position of the passenger. Patent
Document 1: International Publication No. 2005-88664 International Publication No.
2001/072554 pamphlet
[0003]
Various technologies have been developed as audio systems for vehicles. Here, FIG. 1 shows a
schematic configuration of an example of a conventional on-vehicle audio system. FIG. 2 is a
system block diagram of the conventional on-vehicle audio system shown in FIG. The
conventional on-vehicle audio system 1x includes a head unit (H / U) 2x, a front door speaker 3x,
a rear quarter speaker 4x, a ceiling speaker 5x, and a rear seat monitor 6x.
[0004]
The head unit 2x is a reproduction apparatus provided with a CD, a DVD, an MD, a tuner, a TV, a
navigation apparatus, and the like, and incorporates a 4-ch amplifier. The rear seat monitor 6x
provides an image to a listener seated in the rear seat. The front door speaker 3x, the rear
quarter speaker 4x, and the ceiling speaker 5x output the sound reproduced by the head unit 2x
or the sound corresponding to the image displayed on the rear seat monitor 6x.
[0005]
Here, in the above-described conventional in-vehicle audio system 1x, when the rear seat monitor
6x is used, the sound pressure from the ceiling speaker 5x is lower than the sound pressure from
the rear quarter speaker 4x due to the lack of sound pressure It may fall below the degree of
contribution. In this case, although the ceiling speaker 5x is disposed in the vicinity of the rear
09-05-2019
2
seat monitor 6x, there is a concern that the sound from the rear quarter speaker 4x is mainly
delivered to the viewer seated in the rear seat. Ru. In other words, the viewer of the rear seat is
watching the image displayed on the rear seat monitor 6x disposed in front, and there is a
concern that a gap may be felt between the image and the sound corresponding to the image
entering the hearing. Ru.
[0006]
The above-described on-vehicle audio system is merely an example, and includes a reproduction
device, a display device disposed apart from the reproduction device, and a plurality of speakers
commonly used in the reproduction device and the display device. Many audio systems are
known. In such an audio system, when the sound source of the speaker is switched between the
reproduction device and the display device, a shift occurs between the image displayed on the
display device and the sound output from the speaker. There is a concern that
[0007]
In the present invention, in view of the problems described above, in an audio system including a
playback device, a display device disposed apart from the playback device, and a plurality of
speakers commonly used in the playback device and the display device, An object of the present
invention is to provide a technique for reducing the difference between an image displayed on a
display device and an audio output from the speaker when the sound source of the speaker is
switched between the playback device and the display device. .
[0008]
In the present invention, in order to solve the problems described above, a reproduction
apparatus for reproducing predetermined content data, and a display apparatus provided at a
predetermined distance from the reproduction apparatus and displaying an image reproduced by
the reproduction apparatus And detecting the activation of the display device in an audio system
including: and a plurality of speakers for outputting as a voice an audio signal supplied from the
reproduction device including an audio signal of an audio corresponding to an image displayed
by the display device. The sound processing is performed on the audio signals supplied to the
plurality of speakers so that the image displayed on the display device and the audio
corresponding to the image are integrated.
[0009]
More specifically, the present invention relates to a reproduction apparatus for reproducing
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predetermined content data, a display apparatus provided at a predetermined distance from the
reproduction apparatus and displaying an image reproduced by the reproduction apparatus, and
the display An audio signal for performing audio processing on the audio signal in an audio
system including: a plurality of speakers for outputting an audio signal supplied from the
reproduction device including an audio signal of an audio corresponding to an image displayed
by the device as the audio; A processing apparatus, comprising: an operation information
acquisition unit acquiring operation information on an operation state of the display device; and
detecting activation of the display device based on the operation information, and displaying the
display device. Audio signals supplied to the plurality of speakers such that an image displayed
on a device and an audio corresponding to the image are integrally supplied to a viewer who
views the image It comprises an acoustic processing unit for performing acoustic processing,
against.
[0010]
According to the present invention, when the activation of the display device is detected, the
image displayed on the display screen and the sound corresponding to the image are integrally
supplied to the viewer who views the image. Audio processing is performed on the audio signal.
As a result, it is possible to reduce the deviation between the image displayed on the display
device and the sound output from the speaker that may occur when the sound source of the
speaker is switched between the playback device and the display device.
[0011]
An audio signal processing apparatus according to the present invention performs audio
processing on an audio signal in an audio system.
The audio system can be configured to include a playback device, a display device, and a plurality
of speakers.
The playback device plays predetermined content data. As content data, music data, image data
and the like stored in a CD, a DVD and the like are exemplified. The display device displays an
image included in the content data reproduced by the reproduction device. Therefore, the display
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device is preferably electrically connected to the playback device. Although the display device
according to the present invention is provided at a predetermined distance from the reproduction
device, the display device may be provided separately from the reproduction device, and the
predetermined distance is not particularly limited. . For example, the distance between the
navigation device provided in front of the driver's seat and the monitor for the rear seat is
exemplified as the predetermined distance. The plurality of speakers output audio signals
supplied from the reproduction device as audio. The number and arrangement of the speakers
are not limited.
[0012]
The operation information acquisition unit acquires operation information related to the
operation state of the display device, for example, information related to start and stop of the
display device. The operation information acquisition unit may acquire the operation information
from a separately provided sensor or the like, or may be electrically connected to the display
device to directly acquire the operation information from the display device.
[0013]
The sound processing unit performs sound processing on the audio signals supplied to the
plurality of speakers. More specifically, when the display device is activated, the sound
processing unit integrally supplies an image displayed on the display device and a sound
corresponding to the image to a viewer who views the image. Perform sound processing as you
like. Supplying integrally means that the difference between the image provided to the viewer
and the sound is small. In the audio signal processing device according to the present invention,
the reproduction device and the display device are provided at a predetermined interval. This
means that it is assumed that the listener of the music reproduced by the reproduction device
and the viewer who views the image displayed by the display device are different. Therefore, for
example, when the audio output state of the speaker in the case where music is being reproduced
by the reproduction device is the output state when the display device is activated as it is, the
output balance of the audio of the speaker may be bad. Therefore, in addition to the above, the
sound processing unit changes the output state of the sound of the plurality of speakers such
that the plurality of speakers output the sound corresponding to the image displayed by the
display device when the display device is activated. You may do it.
[0014]
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The sound processing unit may perform sound processing to increase the gain of an audio signal
supplied to a nearby speaker in the vicinity of the activated display device among the plurality of
speakers. Further, the sound processing unit increases the gain of an audio signal supplied to a
nearby speaker in the vicinity of the activated display device among the plurality of speakers, and
the distance from the activated display device is greater Acoustic processing may be performed
to reduce the gain of the audio signal supplied to a speaker farther than the distance to the
nearby speaker. Thereby, a sense of unity between the image supplied to the viewer who views
the image displayed on the display device and the sound corresponding to the image can be
obtained.
[0015]
Here, in the audio signal processing device according to the present invention, the audio system
can be an audio system mounted on a vehicle. In this case, the reproduction device is disposed in
front of the driver's seat of the vehicle, and the display device is disposed at a position behind the
driver's seat of the vehicle and viewable from the rear seat of the vehicle. it can. Further, the
plurality of speakers may be a driver's seat speaker in the vicinity of the driver's seat, a ceiling
speaker in the vicinity of the display device, a rear seat speaker in the vicinity of the rear seat,
Can be configured.
[0016]
Examples of the audio system to which the audio signal processing device according to the
present invention can be applied include vehicles and homes. The above-mentioned invention
shows one mode among the cases where it applies to vehicles. According to the present
invention, between an image displayed on the display device and an audio corresponding to the
image displayed on the display device, the audio output from the ceiling speaker disposed in the
vicinity of the display device Deviation can be reduced. That is, when the activation of the display
device is detected in the vehicle, the image displayed on the display device and the sound
corresponding to the image are integrally supplied to the viewer who views the image.
[0017]
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Further, the processing by the sound processing unit in the case where the audio signal
processing device according to the present invention is applied to an audio system mounted on a
vehicle can be, for example, as follows. That is, when the display device is activated, the sound
processing unit outputs the sound corresponding to the image displayed by the display device, so
that the ceiling speaker and the rear seat proximity speaker output the sound of the plurality of
speakers. The ceiling speaker and the rear seat change the audio output state and make the
image displayed on the display device and the audio corresponding to the image integrated with
the viewer viewing the image. An audio signal supplied to a nearby speaker is divided into two
audio signals, and one of the audio signals divided is one audio signal for one audio signal
supplied to the ceiling speaker. The other audio signal which is filtered so as to be in the middle
band or the high band and has a large gain, and which is the other divided audio signal, is
supplied to the rear seat proximity speaker. In contrast, audio signals of said other is to reduce
the gain as well as filtered to a low-frequency band. As a result, in the vehicle, the image
displayed on the display device and the sound corresponding to the image can be integrally
supplied to the viewer who views the image.
[0018]
The present invention may be a program for realizing any of the functions described above, or a
recording medium storing the program. For example, according to the present invention, a
reproduction apparatus for reproducing predetermined content data, a display apparatus
provided at a predetermined distance from the reproduction apparatus and displaying an image
reproduced by the reproduction apparatus, and a display Audio signal processing method for
performing audio processing on the audio signal in an audio system comprising: a plurality of
speakers for outputting as an audio signal an audio signal supplied from the reproduction
apparatus including an audio signal of an audio corresponding to a selected image; An operation
information acquiring step of acquiring operation information related to an operation state of the
display device; detecting activation of the display device based on the operation information; and
displaying on the display device when the display device is activated. Audio signals supplied to
the plurality of speakers such that the image to be reproduced and the audio corresponding to
the image are integrally supplied to the viewer who views the image An audio signal processing
method and audio processing step of performing sound processing, the computer to perform on.
[0019]
Furthermore, the present invention can be an audio system or a car navigation system
incorporating the above-described audio signal processing device. For example, according to the
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7
present invention, there is provided a reproduction apparatus for reproducing predetermined
content data, a display apparatus provided at a predetermined distance from the reproduction
apparatus and displaying an image reproduced by the reproduction apparatus, and the display
apparatus displays , A plurality of speakers for outputting as sound the audio signal supplied
from the reproduction device including the audio signal of the audio corresponding to the
selected image, the operation information acquisition unit for acquiring the operation
information related to the operation state of the display device, The activation of the display
device is detected based on the information, and when the display device is activated, the image
displayed on the display device and the sound corresponding to the image are sent to the viewer
who views the image. And an audio processing unit that performs audio processing on audio
signals supplied to the plurality of speakers so as to be integrally supplied.
[0020]
According to the present invention, in an audio system including a playback device, a display
device disposed apart from the playback device, and a plurality of speakers commonly used in
the playback device and the display device, the sound source of the speaker is When switched
between the playback device and the display device, it is possible to reduce the deviation
between the image displayed on the display device and the sound output from the speaker.
[0021]
Next, an embodiment of an audio signal processing device according to the present invention will
be described based on the drawings.
In the embodiment, the case where the audio signal processing device according to the present
invention is incorporated in a 2ch amplifier unit will be described as an example. As a result, the
head unit, the speaker, the monitor for the rear seat, etc. can use existing equipment. That is,
when the sound source of the speaker is switched between the head unit and the rear seat
monitor, it is displayed on the rear seat monitor by attaching a 2ch amplifier unit with a built-in
audio signal processing device as a retrofit. Deviation between the image and the sound output
from the speaker can be reduced. The details will be described below.
[0022]
<Configuration> FIG. 3 shows a schematic configuration of an audio system 1 including an audio
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signal processing device 70 according to the embodiment. 4 shows a block diagram of the audio
system 1 including the audio signal processing device 70 according to the embodiment. In the
vehicle 100 according to the embodiment, a passenger including a driver can stay. FIG. 1 shows a
system block diagram of an on-vehicle audio system 1 including an audio signal processing
device 70 according to an embodiment. The vehicle 100 is equipped with the in-vehicle audio
system 1. The in-vehicle audio system 1 includes a head unit (H / U) 2, a front door speaker 30, a
rear quarter speaker 40, and a ceiling speaker 50. , A rear seat monitor 60, and an audio signal
processing device 70.
[0023]
(Head Unit) The head unit (H / U) 2 corresponds to the reproduction device of the present
invention, and internally has a central processing unit (hereinafter referred to as a CPU). ) Has
four. The CPU 4 has a control unit 5 therein, and the control unit 5 is a hard disk drive
(hereinafter referred to as an HDD). 10) access various content data stored in 10) and perform
processing such as reproduction of the content data. The CPU 4 is also electrically connected to
the RAM 8 and the ROM 9 as nonvolatile memories, and can access information stored in these
memories as needed.
[0024]
The control unit 5 mainly controls the head unit 2 to function as an apparatus for processing
content data in order to provide music to the user. For example, the head unit 2 has a function of
reproducing content data in the vehicle 100. The head unit 2 will be described as a CD / DVD
deck (hereinafter simply referred to as a CD deck). 11), HDD 10, an interface (I / F) 12
connectable to, for example, a portable music terminal, a navigation device 13, and a user of the
vehicle 100 The person who can operate is the same in the following. And an operation unit 31
for receiving an instruction related to processing of content data from.), Each of which is
electrically connected to the system control unit 5. Further, a DSP (Digital Signal Processor) 19 is
electrically connected to the control unit 5, and the DSP 19 performs arithmetic processing such
as encoding and decoding on the content data sent from the control unit 5, and a 4-ch amplifier
(AMP) Send an electrical signal for music playing to 20. In addition, although the navigation
apparatus 13 is provided in the head unit 4 which concerns on this embodiment, the navigation
apparatus 13 may not be.
[0025]
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9
The operation unit 31 receives a user operation as an instruction regarding reproduction
processing of content data. The received command from the user is sent to the control unit 5 as
an electrical signal. The operation unit 31 is, for example, a volume adjustment button for
adjusting the volume output from a plurality of speakers, a map position movement button for
drawing a position in the north, south, east, and west directions from the current drawing, for
example, when the navigation device 13 is activated. A track up / down button for transferring
content data to be reproduced, a power switch for switching the power supply of the head unit 2
or the like can be used.
[0026]
The display unit 32 can display a map drawing when the navigation device 13 is activated, in
addition to the information of the content data. In addition, the display unit 32 can display
attribute information of content data. The attribute information of the content data includes, for
example, music information and artist information of the content data.
[0027]
(Rear Seat Monitor) The rear seat monitor 60 is provided on a ceiling behind the driver's seat of
the vehicle 100, and is also referred to as a rear seat (also referred to as a rear seat). Provide an
image to the listener seated at The rear seat monitor 60 according to the present embodiment
can be accommodated in the ceiling by folding it when not in use. The rear seat monitor 60 may
display content data (image) from the head unit 2. Further, the rear seat monitor 60 may display
content data (image) supplied from a DVD deck or the like dedicated to the rear seat monitor 60
separately provided in the vehicle 100. The rear seat monitor 60 according to the present
embodiment is configured of a display unit 61 that displays content data, an operation unit 62
that receives an operation on the rear seat monitor 60, and the like. The operation unit 62 also
includes a power switch for turning on / off the rear seat monitor 60.
[0028]
(Speaker) The vehicle 100 is provided with a plurality of speakers such as a front door speaker
(SP) 30, a rear quarter speaker (SP) 40, and a ceiling speaker (SP) 50. The plurality of speakers
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10
output the sound reproduced by the head unit 2 or the sound corresponding to the image
displayed on the rear seat monitor 60.
[0029]
A total of two front door speakers 30 (a front door speaker (L) and a front door speaker (R)) are
provided on left and right front doors, that is, a door for a driver's seat and a door for a
passenger seat. A total of two rear quarter speakers 40 (rear quarter speakers (L) and rear
quarter speakers (R)) are provided on both side surfaces of the vehicle 100 near the rear seat.
The front door speaker 30 and the rear quarter speaker 40 are all configured by so-called fullrange speakers that output low to high frequencies with one speaker. In the embodiment, the
rear quarter speaker 40 is responsible for the low band. A total of two ceiling speakers 50
(ceiling speakers (L) and ceiling speakers (R)) are provided in the vicinity of the rear seat monitor
60 on the ceiling of the vehicle 100. The ceiling speaker 50 is disposed at the closest position to
the rear seat monitor 60 among the plurality of speakers provided in the vehicle 100. In the
present embodiment, the ceiling speaker 50 receives the mid band to the high band. The front
door speaker 30 is electrically connected to the 4ch amplifier 20 provided in the head unit 2 and
outputs the sound signal amplified by the 4ch amplifier 20 as a sound. On the other hand, the
rear quarter speaker 40 and the ceiling speaker 50 are electrically connected to the audio signal
processing device 70, and output the audio signal amplified by the 2ch amplifier 21 in the 2ch
amplifier unit 700 as an audio.
[0030]
Here, in the conventional in-vehicle audio system, the sound contribution from the ceiling
speaker 50 may be less than the sound contribution from the rear quarter speaker 40 due to the
insufficient sound pressure of the ceiling speaker 50, and as a result, Although the ceiling
speaker 50 is disposed in the vicinity of the rear seat monitor 60, there is concern that the
viewer seated in the rear seat will be mainly delivered the sound from the rear quarter speaker
40. That is, the viewer of the rear seat is an image or a video (hereinafter, simply referred to as
an image) displayed on the rear seat monitor 60 disposed in front. ) I was concerned that I could
see a gap between the image and the audio according to the image that enters the hearing. In
order to solve such a problem, in the present embodiment, the audio signal processing device 70
is configured to reduce the difference between the image displayed on the rear seat monitor 60
and the sound output from the plurality of speakers. The sound processing is performed on the
audio signal supplied to the rear quarter speaker 40 and the ceiling speaker 50. The audio signal
processing device 70 will be described below.
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[0031]
(Audio Signal Processing Device) The audio signal processing device 70 is incorporated in the
2ch amplifier unit 700, and performs acoustic processing on the audio signal supplied to the rear
quarter speaker 40 and the ceiling speaker 50. In the present embodiment, the 2ch amplifier unit
700 is installed on the lower side of the driver's seat, but the installation position is not
particularly limited. Here, FIG. 5 shows a block diagram of the audio signal processing device 70
according to the embodiment. As shown in FIG. 5, the audio signal processing apparatus 70
includes an attenuation unit 71, a branching unit 79, an equalizing unit (EQ unit) 72, a high pass
filter unit (HPF unit) 73, a low pass filter unit (LPF unit) 74, and gain adjustment. A section 75,
an adding section 76, an output adjusting section 77, and an amplifier control section 78 are
provided. The attenuation unit 71, the branching unit 79, the high pass filter unit (HPF unit) 73,
the low pass filter unit 74, and the output adjustment unit 77 are classified into Lch
correspondence and Rch correspondence (L added after the code corresponds to Lch , R
represents Rch correspondence), the equalizing unit (EQ unit) 72, and the gain adjustment unit
75 are distinguished between Lch correspondence and Rch correspondence and are also
distinguished corresponding to each route after branching (symbols of symbols L attached after
L represents Lch correspondence, R represents Rch correspondence, and numbers appended
after L and R represent the post-branching route). In addition, even if the above-mentioned
respective function units such as the attenuation unit 71 etc. basically have the same function
even if the corresponding channel and route are different, only the reference numerals are
shown unless it is necessary to distinguish Do.
[0032]
The attenuation unit 71 attenuates the audio signal output from the head unit 2 to an
appropriate signal level. In the present embodiment, among the audio signals output from the
head unit 2 as the attenuator 71, the attenuator 71L to which the audio signal to the ceiling
speaker 50L and the rear quarter speaker 40L is input, and the head unit 2 Among the audio
signals, there are attenuators 71R to which audio signals to the ceiling speaker 50R and the rear
quarter speaker 40R are input. The attenuation unit 71 can be configured by an attenuator. The
audio signal attenuated by the attenuation unit 71 is output to the branch unit 79.
[0033]
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The branching unit 79 divides the audio signal attenuated by the attenuation unit 71 into two
signals. In the present embodiment, the branch unit 79 includes a branch unit 79L that branches
the audio signal from the attenuator 71L and a branch unit 79R that branches the audio signal
from the attenuator 71R. The branch unit 79 can be configured by a branch circuit. The audio
signal branched by the branching unit 79 is output to the equalizing unit 72.
[0034]
The equalizing unit 72 changes the frequency characteristic of the audio signal branched by the
branching unit 79 (also referred to as equalizing). )する。 In this embodiment, as the equalizing
unit 72, an equalizing unit 72L1 provided in the first Lch route, an equalizing unit 72L2 provided
in the second Lch route, an equalizing unit 72R1 provided in the first Rch route, and Rch And the
equalizing unit 72R2 provided in the second route of The equalizing unit 72 can be configured
by an equalizer circuit. The first route means a signal path provided with the high pass filter unit
73, and the second route means a signal path provided with the low pass filter unit 74. The audio
signal equalized by the equalizing unit is output to the high pass filter unit 73 or the low pass
filter unit 74.
[0035]
The high pass filter unit 73 attenuates the low frequency band audio signal and passes the high
frequency band audio signal. On the other hand, the low pass filter unit 74 attenuates the audio
signal in the high frequency band and passes the audio signal in the low frequency band. In the
present embodiment, the high pass filter unit 73 includes a high pass filter unit 73L provided for
Lch and a high pass filter unit 73R provided for Rch. Further, as the low pass filter unit 74, there
are a high pass filter unit 73L provided in Lch and a low pass filter unit 74R provided in Rch. The
high pass filter unit 73 and the low pass filter unit 74 can each be configured by a filter circuit.
The audio signal that has passed through the high pass filter unit 73 or the low pass filter unit
74 is output from each filter to the gain adjustment unit 75.
[0036]
The gain adjustment unit 75 adjusts the gain (sound pressure) of the audio signal from the high
pass filter unit 73 or the low pass filter unit 74. In this embodiment, as the gain adjusting unit
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75, a gain adjusting unit 75L1 provided on the first Lch route, a gain adjusting unit 75L2
provided on the second Lch route, and a gain adjusting unit provided on the first Rch route There
are 75R1 and a gain adjustment unit 75R2 provided in the second route of Rch. The gain
adjustment unit 75 can be configured by a variable circuit. Note that the audio signal processing
device 70 according to the present embodiment adjusts the gain according to the activation state
of the rear seat monitor 60 to output the image displayed on the rear seat monitor 60 and the
plurality of speakers. It is characterized in that the deviation between the voice and the voice is
reduced. The specific adjustment of the gain will be described later. The audio signal whose gain
has been adjusted is output from gain adjustment unit 75 to addition unit 76.
[0037]
The addition unit 76 adds the audio signal from the first route and the audio signal from the
second route. In the present embodiment, the addition unit 76 includes an addition unit 76L
provided in Lch and an addition unit 76R provided in Rch. The addition unit 76 can be
configured by an addition circuit. The audio signal added by the adding unit 76 is output from
the adding unit 76 to the output adjusting unit 77.
[0038]
The output adjustment unit 76 adjusts the output of the audio signal. In the present embodiment,
the output adjusting unit 76 includes an output adjusting unit 76L provided in Lch and an output
adjusting unit 76R provided in Rch. The output adjustment unit 76 can be configured by an
audio power IC. The audio signal whose output has been adjusted by the output adjustment unit
76 is output from the output adjustment unit 76 to a plurality of speakers, and is finally output
as sound from each speaker into the vehicle 100.
[0039]
The amplifier control unit 78 controls sound processing performed by the 2ch amplifier 21. The
amplifier control unit 78 includes an operation information acquisition unit 781, an acoustic
processing unit 782, and a storage unit 783. The internal configuration of the amplifier control
unit 78 can be realized by a program executed by the CPU 780. Further, in place of such a
configuration, the amplifier control unit 78 may realize any one or more of its internal
configurations by a processor different from the CPU 780, a hardware circuit, or the like.
09-05-2019
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[0040]
The operation information acquisition unit 781 acquires, as operation information related to the
state of the operation of the rear seat monitor 60, information related to activation or stop of the
rear seat monitor 60. In the present embodiment, the operation information acquisition unit 781
acquires information regarding activation or stop of the rear seat monitor 60 directly from the
power switch of the rear seat monitor 60. A sensor may be separately disposed, and operation
information of the rear seat monitor 60 may be acquired from the disposed sensor. Further, in
the present embodiment, since the rear seat monitor 60 is foldable, a signal from a motor for
folding the rear seat monitor 60 may be acquired as operation information of the rear seat
monitor 60.
[0041]
When the rear seat monitor 60 is activated, the sound processing unit 782 integrally supplies the
image displayed on the rear seat monitor 60 and the sound corresponding to the image to the
viewer who views the image. Perform sound processing as you do. More specifically, when the
rear seat monitor 60 is activated, the sound processing unit 782 lowers the low band gain
handled by the rear quarter speaker 40 and the mid band to high band gains handled by the
ceiling speaker 50. The gain adjustment unit 75 is controlled to raise the The details of the sound
processing by the sound processing unit 782 will be described later. In the present embodiment,
the sound processing unit 782 accesses the gain adjustment table stored in the storage unit 783
and executes sound processing.
[0042]
The storage unit 783 stores a gain adjustment table used when performing gain adjustment.
Here, FIG. 6 shows a gain adjustment table. As shown in the figure, the gain adjustment table is
divided for each gain adjustment unit 75, and for each gain adjustment unit 75, the gain increase
or decrease at the time of rear seat monitor activation or stop is recorded. For example, when the
rear seat monitor 60 is activated, the gains of the gain adjustment unit 75L1 and the gain
adjustment unit 75R1 are increased. The storage unit 783 also stores a predetermined program
executed by the CPU 780 of the amplifier control unit 78. The storage unit 783 includes volatile
RAM (Random Access Memory) and nonvolatile ROM (Read Only Memory). The ROM includes a
09-05-2019
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rewritable semiconductor memory such as a flash memory, an EPROM (Erasable Programmable
Read-Only Memory), and an EEPROM (Electrically Erasable Programmable Read-Only Memory).
[0043]
<Processing Flow> Next, acoustic processing performed by the amplifier control unit 78 of the
audio signal processing device 70 according to the present embodiment will be described. FIG. 7
shows the sound processing flow. As shown in the figure, in step S01, the operation information
acquisition unit 781 acquires operation information of the rear seat monitor 60. When the
acquisition of the operation information is completed, the process proceeds to step S02.
[0044]
In step S 02, the sound processing unit 782 determines whether the rear seat monitor 60 is
activated (ON) or stopped (OFF) based on the acquired operation information. Whether the rear
seat monitor 60 is ON or OFF depends on whether the voltage (for example, DC 例 え ば V) of the
electric signal from the rear seat monitor 60 acquired as operation information exceeds a
predetermined value. It can be judged. If the rear seat monitor 60 is activated (ON), the process
proceeds to step S03. On the other hand, when the rear seat monitor 60 is stopped, the process
proceeds to step S02 again.
[0045]
In step S03, the gain is adjusted. Specifically, the gain of the gain adjustment unit 75L1 and the
gain adjustment unit 75R1 is increased by the sound processing unit 782, and the gains of the
gain adjustment unit 75L2 and the gain adjustment unit 75R2 are decreased. Thereby, the gain
of the voice signal of the middle band to the high band passing through the high pass filter unit
73 is increased, the gain of the voice signal of the low band passing through the low pass filter
unit 74 is decreased, and the adding unit 76 adds An audio signal is output to the ceiling speaker
50 or the rear quarter speaker 40. Here, in the present embodiment, the ceiling speaker 50
receives the middle band and the rear quarter speaker 40 receives the low band. Therefore, the
contribution to the rear seat of the sound outputted from the ceiling speaker 50 located in the
vicinity of the rear seat monitor 60 becomes large, and the distance to the rear seat monitor 60 is
longer than that of the ceiling speaker 50. The degree of contribution to the rear seat of the
sound output from the speaker 40 is reduced. As a result, when the sound sources of the
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plurality of speakers are switched between the head unit 2 and the rear seat monitor 60,
between the image displayed on the rear seat monitor 60 and the sound output from the
plurality of speakers Misalignment can be reduced. The process in step S03 is a process when
the rear seat monitor 60 is switched from off to on, and in the case of from on to on, gain
adjustment is not particularly performed.
[0046]
If, for example, the output state of the voices of the plurality of speakers when the music is
reproduced by the head unit 2 is the output state when the rear seat monitor 60 is activated as it
is, the output balance of the voices of the plurality of speakers is bad There is. Therefore, when
the rear seat monitor 60 is activated, the sound processing unit 782 first causes the rear quarter
speaker 40 and the ceiling speaker 50 to output a sound corresponding to the image displayed
by the rear seat monitor 60. The audio output state of the speaker may be changed, and the gain
adjustment may be performed on that.
[0047]
In step S04, the acoustic processing unit 782 reduces the gains of the gain adjusting unit 75L1
and the gain adjusting unit 75R1, and increases the gains of the gain adjusting unit 75L2 and the
gain adjusting unit 75R2. Note that the process in step S04 is a process when the rear seat
monitor 60 is switched from on to off, and gain adjustment is not particularly performed in the
case of from off to off.
[0048]
<Effects> According to the audio signal processing device according to the embodiment
described above, when the rear seat monitor 60 is activated, the rear of the sound output from
the ceiling speaker 50 located in the vicinity of the rear seat monitor 60 The degree of
contribution to the seat is increased, and the degree of contribution to the rear seat of the sound
output from the rear quarter speaker 40, which is further from the ceiling speaker 50 to the rear
seat monitor 60, is reduced. As a result, when the sound sources of the plurality of speakers are
switched between the head unit 2 and the rear seat monitor 60, between the image displayed on
the rear seat monitor 60 and the sound output from the plurality of speakers Misalignment can
be reduced.
09-05-2019
17
[0049]
In the embodiment described above, by installing the audio signal processing device 70
separately from the head unit 2, existing equipment can be used. However, it is not limited to
such an aspect. The audio signal processing device 70 may be incorporated into the head unit 2.
In addition to the adjustment of the gain in the above-described embodiment, a delay process or
the like may be performed. Thereby, the deviation between the image displayed on the rear seat
monitor 60 and the sound output from the plurality of speakers can be further reduced.
[0050]
The schematic structure of an example of the conventional vehicle-mounted audio system is
shown. FIG. 2 shows a system block diagram of the conventional car audio system shown in FIG.
1 shows a schematic configuration of an audio system including an audio signal processing
device according to an embodiment. 1 shows a block diagram of an audio system including an
audio signal processing device according to an embodiment. FIG. 1 shows a block diagram of an
audio signal processing device according to an embodiment. 7 shows a gain adjustment table.
The sound processing flow is shown.
Explanation of sign
[0051]
DESCRIPTION OF SYMBOLS 1 ... Audio system 2 ... Head unit 4 ... CPU 5 ... Control part 8 ... RAM
9 ... ROM 10 ... HDD 10a ... Music DB 11 ... CD / DVD deck 12 · · · I / F USB 13 · · · navigation
device 19 · · · DSP 20 · · · 4ch amplifier 21 · · · 2ch amplifier 30 · · · front door speaker 40 · · · rear
quarter speaker 50 · · · Ceiling speaker 60 ... Rear seat monitor 70 ... Audio signal processing
device 71 ... Attenuation section 72 ... Equalizing section 73 ... High pass filter section 74 ... Low
pass filter section 75 ... Gain adjustment Unit 76: Adder unit 77: Output adjustment unit 78:
Amplifier control unit 79: Branch unit 780: CPU (2 ch amplifier) 781: Operation information
Acquisition unit 782 Sound processing unit 783 Storage unit (prior art) 1x Audio system 2x Head
unit 3x Front door speaker 4x Rear quarter speaker 5x ... Ceiling speaker
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