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JP2008288713

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DESCRIPTION JP2008288713
An object of the present invention is to eliminate discomfort due to changes in the sound field
and frequency characteristics that one of the front and rear seats exerts on the other, thereby
making it possible to listen to different audio contents while maintaining a comfortable state. An
on-vehicle audio reproduction system sequentially monitors an audio signal in front and back
seats and sequentially reproduces and outputs the volume and frequency characteristics of the
other seat according to the volume and frequency characteristics of the front and rear seats. A
control unit 15 is provided to reproduce voice independently at front and rear seats in the
vehicle interior space. [Selected figure] Figure 2
Automotive audio reproduction system
[0001]
The present invention relates to an on-vehicle audio system capable of reproducing audio
independently at front and rear seats in a vehicle interior space.
[0002]
2. Description of the Related Art An on-vehicle audio reproduction system capable of reproducing
audio independently at front and rear seats in a vehicle interior space is conventionally known.
For example, in a vehicle-mounted audio system, when the passengers in the front and rear seats
enjoy different contents, the sound generated by the rear seat side speaker is muted so that the
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sound of the corresponding contents can be clearly heard, and the rear seat boarding Some
persons provide an audio signal of rear seat content via a rear seat monitor (see, for example,
Patent Document 1). In addition, in the on-vehicle acoustic system having a deep bass
reproduction speaker (subwoofer), the connection to the subwoofer is cut off when the
passengers in the front and rear seats enjoy different contents, and the change in the sound field
due to the subwoofer shutoff is corrected. In some cases, each passenger can obtain audio
information without having a sense of discomfort in the sense of hearing (see, for example,
Patent Document 2).
[0003]
JP, 2006-248253, A JP, 2003-158789, A
[0004]
However, according to the technology disclosed in Patent Document 1 described above, in order
to mute the sound output from the rear seat side speaker, the rear seat passenger has the
frequency characteristics and the sound field feeling of the sound that should be originally
obtained. It can not be obtained, which may cause discomfort.
Also, when the rear seat passenger listens to a voice different from that of the front seat using,
for example, headphones, the front seat passenger who is the listener by the speaker is not
unable to hear due to the sound leakage of the high sound range due to the voice of the
headphones. There was a problem that I sometimes felt pleasure.
[0005]
On the other hand, according to the technique disclosed in Patent Document 2, since the audio
signal to be normally listened changes every moment, for example, the listener with the
headphone can be heard at the moment when the volume level of the bass emitted by the
speaker suddenly increases. However, there is a problem that the listener by the speaker feels
discomfort due to the sound leakage of the high-pitched range emitted by the headphones or the
headphones emit.
[0006]
The present invention has been made to solve the above-mentioned problems, and eliminates
discomfort caused by changes in the sound field and frequency characteristics caused by one
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voice in the front and rear seats affecting the other, and makes different voice contents
comfortable. It is an object of the present invention to provide an on-vehicle audio reproduction
system that can be listened to while maintaining a steady state.
[0007]
In order to solve the problems described above, the on-vehicle audio reproduction system
according to the present invention sequentially monitors audio signals in front and rear seats,
and sequentially controls the volume and frequency characteristics of the other seat according to
the volume and frequency characteristics of one seat. And a control unit that reproduces and
outputs the sound, and reproduces independent voices in front and rear seats in the vehicle
interior space.
[0008]
Further, the on-vehicle audio reproduction system of the present invention is capable of
independently reproducing audio in front and rear seats in the vehicle interior space, and the
audio signal generated and output by the audio input source in one seat and the other seat An
input unit takes in an audio signal to be reproduced and output as an external input, and an
audio signal taken in via the input unit is sequentially monitored in front and back seats, and
according to the volume and frequency characteristics in one seat, the volume in the other seat A
control unit that sequentially controls and reproduces and outputs frequency characteristics, and
an output unit that switches and outputs an audio signal output by the control unit based on an
instruction of a passenger.
[0009]
According to the present invention, it is possible to eliminate an unpleasant feeling based on a
change in a sound field or frequency characteristics caused by one voice in the front and rear
seats affecting the other, and to be able to listen to different voice contents while maintaining a
comfortable state An audio reproduction system can be provided.
[0010]
Embodiment 1
FIG. 1 is a view schematically showing an example of a vehicle equipped with an on-vehicle audio
reproduction system according to a first embodiment of the present invention.
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[0011]
As shown in FIG. 1, the vehicle 1 is provided with speakers indicated by FL / FR on the left and
right of the front seat and RL / RR on the left and right of the rear seat.
Furthermore, although a subwoofer indicated by SW, although not shown, a large number of
speakers may be mounted, such as installing a center speaker in front of the front seat.
Further, the vehicle 1 has a front control unit 10 (hereinafter referred to as a user interface such
as an operation unit or display for allowing the passenger to input various selection instructions
and operation instructions at a position where the front seat passenger can easily operate) , Head
unit 10) is provided.
[0012]
Furthermore, the vehicle 1 uses HP indicated headphones, which are used when different content
is enjoyed in the front and rear seats, in a position where it is considered that the rear seat
passenger can enjoy the content including the image. There is provided a rear control unit 20
having a function to do this.
In addition, the rear control unit 20 may be provided with an independent speaker, and further
may be provided with a user interface such as an operation unit and a display for the rear seat
passenger to input various selection instructions and operation instructions. It is also good.
[0013]
FIG. 2 is a block diagram showing an internal configuration of the head unit 10 in the in-vehicle
audio reproduction system according to the first embodiment of the present invention.
Here, the blocks of the video control system are omitted, and only the blocks of the audio control
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system are extracted and shown.
[0014]
As shown in FIG. 2, the head unit 10 includes a tuner unit 11 including a television tuner and a
radio tuner, and a CD (Compact Disc), an MD (Mini Disc), a DVD (Digital Versatile Disc) or the like
to be loaded. A disk unit 12 for reproducing audio data recorded in a medium and a plurality of
input sources such as an external audio input 13 (external input terminal) are connected, and
audio input by these input sources is taken in by an input unit 14.
[0015]
The input unit 14 selects an analog audio signal to be reproduced and output from each of the
above-described audio input sources based on the instruction of the passenger and takes in the
input source selection unit 141 and the analog signal output via the input source selection unit
141 Are converted into digital signals and output to the control unit 15 as an analog digital
conversion unit (ADC 142).
Further, an audio signal output by the rear control unit 20 is taken into the input unit 14 and
supplied as an external input (AUX).
[0016]
The control unit 15 sequentially monitors the voice signals acquired by the input unit 14 in front
and back seats, sequentially controls the volume and frequency characteristics of the other seat
according to the volume and frequency characteristics of one seat, and outputs the output unit
16 Supply. Details of the internal configuration and the like will be described later with reference
to FIG. The output unit 16 converts the digital signal output from the control unit 15 into an
analog signal, an output selection unit 161 that switches and outputs an output destination based
on an instruction from the passenger, and an output signal from the output selection unit 161.
And a digital analog converter (DAC 162) for outputting to the connected speaker FL, FR, RL, RR,
SW or headphone HP.
[0017]
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Although the above-described configuration has been described as being included in the head
unit 10, the rear control unit 20 also has a similar configuration. In this case, the audio signal
output by the head unit 10 is acquired as an external input (AUX).
[0018]
FIG. 3 is a block diagram showing an example of the internal configuration of the control unit 15
shown in FIG. The control unit 15 is constituted by, for example, a microprocessor, and is
constituted by a frequency characteristic measurement unit 151, a comparison operation unit
152, and an audio adjustment unit 153, as its internal configuration is expanded and shown in
FIG. .
[0019]
The frequency characteristic measurement unit 151 obtains the front seat audio signal and the
rear seat audio signal captured by the input unit 14 (ADC 142) as an input, and sequentially
measures (monitors) the volume levels in several frequency bands of audio. The signal is supplied
to one input terminal of the comparison operation unit 152. The comparison operation unit 152
has a function of sequentially comparing the frequency characteristic monitored by the
frequency characteristic measurement unit 151 with a predetermined frequency characteristic
set in advance, and supplying the result to the voice adjustment unit 153.
[0020]
The voice adjustment unit 153 extracts a change in the volume level of a specific frequency band
in which the sound in one seat affects the listening of the sound in the other seat according to
the output of the comparison operation unit 152, and the extracted one The volume level of the
specific frequency band of the voice is adjusted (Vol: volume adjustment and EQ: equalizing
processing) and supplied to the output unit 16 (output selection unit 161). In FIG. 3, solid arrows
indicate voice signals, and dotted arrows indicate control signals.
[0021]
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FIG. 4 is a flowchart showing the operation of the in-vehicle audio reproduction system according
to the first embodiment of the present invention. Here, the operation of the control unit 15 in the
head unit 10 is mainly extracted and shown. Hereinafter, the operation of the in-vehicle sound
reproduction system according to the first embodiment of the present invention shown in FIGS. 1
to 3 will be described in detail with reference to the flowchart of FIG.
[0022]
The control unit 15 first determines whether the audio content being reproduced in the front
seat and the rear seat is different (step ST401). The determination as to whether the content of
the audio content to be heard differs between the front seat and the rear seat can be made by
referring to the content of the external input 14 fetched by the input unit 14. Here, when it is
determined that they are different (step ST401 YES ), the comparison operation unit 152
indicates frequency characteristics that the frequency characteristic measurement unit 151 is
sequentially monitoring, and data indicating predetermined frequency characteristics set in
advance. (Hereinafter referred to as threshold data) is compared (step ST402). When it is
determined that the audio contents to be heard in the front seat and the rear seat are the same
(step ST401 NO ), the processing is ended without comparing the frequency characteristics
(step ST406).
[0023]
The frequency characteristic measurement unit 151 sequentially measures the volume level of
each band of several frequency bands and supplies it to one input end of the comparison
operation unit 152. The frequency band measured here may be fixed in advance to a frequency
band in which the audio output at one seat in the front and rear seats affects the audio listening
at the other seat, such as high and low tones, for example. Or, it may be dynamically changed by
the designation of the passenger. Also, as a threshold, a volume level at which the speaker output
affects the listening of sound by the headphone HP, or a volume level at which the headphone
output influences the listening of sound by the speaker is measured in advance, and the other
input of the comparison operation unit 152 It shall be supplied at the end.
[0024]
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The comparison calculation result by the comparison calculation unit 152 is supplied to the voice
adjustment unit 153. When it is determined by the comparison operation unit 152 that the
volume level measured by the frequency characteristic measurement unit 151 is larger than the
threshold (step ST403 YES ), the voice adjustment unit 153 receives an input acquired via the
input unit 14 The volume level of the voice is adjusted and supplied to the output unit 16 (step
ST404), and the comparison operation unit 152 determines that the volume level measured by
the frequency characteristic measurement unit 151 is smaller than the threshold (step ST403
NO ), the process ends without performing adjustment according to the comparison result
(step ST405).
[0025]
The digital signal subjected to the volume level adjustment output by the control unit 15 (volume
adjustment unit 153) is supplied to the output unit 16, where it is converted into an analog
signal and is connected to a speaker or headphones connected based on a passenger's
instruction. It is output.
[0026]
Here, the above-mentioned adjustment processing of the volume level (step ST404) will be
specifically described.
Here, the front seat passenger listens to the audio content A by the speakers FL / FR and RL / RR
(may include the subwoofer SW and the like), and the rear seat passenger listens to the audio
content B different from A by the headphone HP. The case of listening is assumed.
[0027]
Under the listening environment of the audio content described above, for example, when the
deep bass range of the audio content A is rapidly enhanced and reproduced at a certain moment,
conventionally, the rear seat passenger is an audio content different from the desired audio
content B Under the influence of A, the user would hear an audio signal in which the deep bass
range was artificially enhanced, and felt discomfort or discomfort. On the other hand, according
to the first embodiment of the present invention, the audio adjusting unit 153 can reduce the
weight of the audio content A by appropriately giving the threshold set in advance to the control
unit 15 (comparison operation unit 152). Equalization (attenuation processing of the volume
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level in the deep bass range of the frequency characteristic) is performed so as to suppress the
volume level of the heavy bass range of the audio content A at the moment when the bass range
is sharply enhanced. For this reason, the rear seat passenger can listen to the audio content B
with the same frequency characteristics as before, and therefore, it is possible to reduce
discomfort and discomfort.
[0028]
Further, at the moment when the bass of the audio content B is sharply enhanced and
reproduced, the audio adjustment unit 153 receiving the comparison operation result by the
comparison operation unit 152 performs equalization (determination such that the volume level
of the bass of the audio content B is suppressed. Equalizing to increase the overall volume level
of the audio content B so as to reduce the volume level in the frequency band or to relatively
reduce the influence of the audio content A (volume level in a specific frequency band In the
amplification process of (1), both front and rear seats can listen to the audio contents A and B
with the same frequency characteristics as before. Therefore, it is possible for both front and rear
seat passengers to listen to the audio content without discomfort or discomfort.
[0029]
As described above, according to the vehicle-mounted audio reproduction system in accordance
with the first embodiment of the present invention, when the front seat and the rear seat listen to
different contents in the vehicle interior space, the audio signals of both contents are monitored
(frequency Measurement of characteristics) and control of the other volume level and frequency
characteristics according to one volume level and frequency characteristics reduce discomfort
caused by changes in the sound field and frequency characteristics in which one affects the
other. As a result, it is possible to simultaneously listen to different audio contents while
maintaining a comfortable state. Although the above-mentioned equalizing processing has been
described as being automatically performed by the voice adjustment unit 153, it is also possible
to perform it manually by adjusting the volume by the passenger. As a result, fine adjustment can
be performed in accordance with the operation situation of the vehicle, and adaptive control can
be performed that can form an optimal sound field or can be set to the frequency characteristic.
[0030]
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Further, according to the above-described first embodiment of the present invention, only the
head unit 10 is illustrated to adjust the sound to be heard in one of the front and rear seats, but
the same control is performed in the rear control unit 20 as well. By performing the same control
in both or both of them, it is possible for the passengers in the front and rear seats to listen to
the audio content without much discomfort or discomfort in the vehicle interior space. In
addition, the functions possessed by the input unit 14 and the control unit 15 are combined into
one control device and connected between the head unit 10 having the output unit 16 and the
rear control unit 20, and the control device comprises the head unit 10 and the rear unit. The
above-described on-vehicle audio reproduction system may be constructed by controlling both of
the control units 20.
[0031]
Further, according to the first embodiment of the present invention, the front seat passenger
listens to the audio content A by the speakers FL / FR and RL / RR, and the rear seat passenger
listens to the audio content different from the audio content A by the headphone HP. Although
the case of listening to B is described, the rear seat passenger is not limited to the listening by
the headphone HP, for example, the same effect can be obtained when listening by a speaker
mounted exclusively for the rear seat. It is a thing. In the first embodiment of the present
invention described above, data processing in control unit 15 (frequency characteristic
measurement unit 151, comparison operation unit 152, and voice adjustment unit 153)
constituting head unit 10 is one or more than one. The program may be implemented on a
computer, and at least a portion thereof may be implemented in hardware.
[0032]
BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed typically an example of
the vehicle by which the vehicle-mounted audio reproduction system which concerns on
Embodiment 1 of this invention was mounted. FIG. 2 is a block diagram showing an internal
configuration of a head unit in the in-vehicle audio reproduction system according to
Embodiment 1 of the present invention. It is a block diagram which shows an example of an
internal structure of the control part shown in FIG. It is a flowchart which shows operation ¦
movement of the vehicle-mounted audio reproduction system which concerns on Embodiment 1
of this invention.
Explanation of sign
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[0033]
Reference Signs List 1 vehicle 10 front control unit (head unit) 11 tuner unit (voice input source)
12 disk unit (voice input source) 13 external input (AUX) 14 input unit 15 control unit 16 output
unit 20 Rear control unit, 141 input selection unit, 142 analog digital conversion unit (ADC), 151
frequency characteristic measurement unit, 152 comparison operation unit, 153 audio
adjustment unit, 161 output selection unit, 162 digital analog conversion unit (DAC).
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