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JP2002191100

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002191100
[0001]
The present invention relates to an audio apparatus having a front speaker disposed on the front
side and a rear speaker disposed on the rear side of a room, wherein audio signals output from
the front speaker and the rear speaker are provided. The present invention relates to an audio
device capable of adjusting the balance of the volume levels of
[0002]
2. Description of the Related Art An on-vehicle acoustic device mounted in a vehicle
compartment is known as a conventional acoustic device provided with a front speaker disposed
on the front side and a rear speaker disposed on the rear side. The on-vehicle acoustic device has
a main volume function that adjusts the volume level of the audio signal, and a fader function
that adjusts the balance of the volume levels of the audio signals output from the front speaker
and the rear speaker. The main volume function and the fader function make it possible to create
a realistic sound field in the vehicle interior.
[0003]
This fader function has the characteristics as shown in FIG. When the sound image formed by the
output of the audio signal is localized at the center of the vehicle compartment, the volume level
of the front speaker and the volume level of the rear speaker are set as the volume level of the
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1
main volume (indicated by X in the figure) There is. From that state, when the user operates a
fader adjustment button or the like provided on the operation panel so that the sound image
formed by the output of the audio signal is localized forward, the volume level of the front
speaker (in FIG. In the figure, the volume level of the main volume does not change, and only the
volume level of the rear speaker (indicated by (b) in the figure) is attenuated (indicated by the
area on the left from the dotted line ). In addition, when the user operates a fader adjustment
button or the like provided on the operation panel so that the sound image formed by the output
of the audio signal is localized backward, the volume level of the rear speaker remains
unchanged as the volume level of the main volume Without this, only the volume level of the
front speaker is attenuated (shown in the area on the right from the dotted line indicated by Y in
the figure to the paper surface).
[0004]
Further, by connecting an external device such as a navigation device or an FM receiver to a
front speaker or a rear speaker of this in-vehicle acoustic device, audio information is output
from the external device together with an audio signal from the connected speaker. You can also.
In that case, when an audio signal is supplied from an external device, the above-described fader
function is automatically balanced by the control of a microcomputer or the like.
[0005]
For example, when an audio signal is supplied from the external device to the front speaker in a
state where the sound image formed by the output of the audio signal is localized to the front
side by the user's operation of the fader adjustment button or the like, The volume level of the
front speakers is automatically attenuated to the minimum level. At this time, the volume level of
the rear speaker that has been attenuated by a predetermined amount is taken as the volume
level of the main volume.
[0006]
FIG. 7 shows how this volume level changes. As shown in the figure, when the sound image
formed by the output of the audio signal is localized to the front side by the user's operation of
the fader adjustment button etc., the volume level of the rear speaker (indicated by (E) in the
figure) Is attenuated by a predetermined amount from the main volume level (shown by (C) in the
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2
figure). At this time, the volume level of the front speaker (indicated by (2) in the figure) is the
volume level of the main volume (indicated by the area on the left side of the paper from the
dotted line indicated by Z in the figure).
[0007]
From this state, when an audio signal from an external device is supplied to the front speaker, the
volume level of the rear speaker is attenuated by a predetermined amount in order to localize the
sound image formed by the audio signal to the center under control of a microcomputer or the
like. Is the volume level of the main volume. Then, the volume level of the front speaker is
attenuated to the minimum level, and the sound image formed by the audio signal is localized
rearward. As described above, when the volume level of the front speaker is attenuated to the
minimum level, the volume level of the rear speaker is the volume level of the main volume (from
the dotted line indicated by Z in the figure to the right area Show).
[0008]
SUMMARY OF THE INVENTION When the sound image formed by the output of the audio signal
is localized on the front side, the listening feeling of the user sitting in the vehicle compartment is
strongly felt on the front side. In that state, when an audio signal from an external device is
supplied to the front speaker as interrupt information, first, the volume level of the rear speaker
is made the volume level of the main volume, but the sound image localized to the front side is
Along with being moved to the center, the user's sense of hearing is also drawn to the center.
[0009]
Then, when the volume level of the front speaker is attenuated to the minimum level, the sound
image moves from the center to the rear side, and the user's sense of listening is also drawn from
the center to the rear side. Then, when the volume level of the front speaker reaches the
minimum level, the user's sense of listening is already drawn from the front side to the back side,
so when listening to the audio information from the external device, The feeling is something that
can be felt strongly on the back side. That is, at the stage of listening to the audio information of
the external device output from the front speaker, if the feeling of listening is felt strongly at the
rear side, the user may miss the audio information output from the front speaker, or As a result,
there is a possibility that the information may be heard as incorrect information, resulting in
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problems such as the inability to accurately hear the audio information.
[0010]
The present invention has been made in view of the above problems, and its object is to provide a
sense of hearing even when the sound image formed by the output of the audio signal is
transferred when the audio information from the external device is interrupted and output. It is
an object of the present invention to provide an audio device which can minimize the loss of the
audio signal and make the audio information be correctly heard.
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, an acoustic device
according to the invention described in claim 1 comprises a front speaker installed on the front
side of a room and a rear speaker located on the rear side; The balance between the volume
adjustment means for adjusting the volume level of the audio signal, the first volume level
indicating the volume of the audio signal output from the front speaker, and the second volume
level indicating the volume of the audio signal output from the rear speaker A sound is
transmitted from an external device to a speaker that outputs an audio signal of the first or
second volume level that is not attenuated in a state in which the first or second volume level is
attenuated by a predetermined amount by the balance adjustment unit that adjusts When a
signal is supplied and the first or second unattenuated volume level is attenuated, the volume
level of the audio signal is The characterized by comprising control means for controlling the
volume adjustment means, a such that a predetermined amount attenuation.
[0012]
An audio apparatus according to the invention of claim 2 is the audio apparatus according to
claim 1, wherein the control means is not attenuated when an audio signal is supplied from an
external apparatus. (2) Attenuating the volume level to the minimum level.
[0013]
According to a third aspect of the present invention, there is provided the audio apparatus
according to the second aspect, wherein the control means controls the volume of the attenuated
audio signal when the supply of the audio signal by the external apparatus is completed. The first
or second volume level attenuated to the level and the minimum level is a state before an audio
signal is supplied from an external device.
[0014]
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DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present
invention will be described below with reference to the drawings.
The embodiment of the present invention will be described using an on-vehicle acoustic device
mounted in a vehicle compartment.
[0015]
First, the configuration and schematic operation of the on-vehicle acoustic device 100 according
to the present embodiment will be described with reference to FIGS. 1 to 3.
FIG. 1 is a circuit block diagram of the in-vehicle acoustic device 100, and FIG. 2 is an external
view showing an operation panel of the in-vehicle acoustic device 100. As shown in FIG.
FIG. 3 is an equivalent circuit diagram of the electronic volume 10 used in the on-vehicle acoustic
device 100. As shown in FIG.
[0016]
The in-vehicle acoustic device 100 includes an electronic volume 10, a power amplifier unit 20
for amplifying L channel and R channel audio signals, a front speaker FL disposed on the left
front side in the vehicle compartment, and a left rear side. The rear speaker RL, the front speaker
FR disposed on the right front side, the rear speaker RR disposed on the right rear side, the
operation unit 21, the display unit 24, the microcomputer 25 that controls the entire apparatus,
and the RAM 26 Configured
[0017]
The electronic volume 10 adjusts a volume level (hereinafter referred to as a main volume level)
of audio signals of L channel and R channel, and outputs the volume control unit 10a and the L
channel supplied from the volume control unit 10a. An audio signal is equally distributed and
supplied to a front speaker FL and a rear speaker RL installed on the left side in the vehicle
compartment, and an A fader 10b for attenuating the volume level of the audio signal as needed,
and a volume control unit 10a The audio signal of R channel supplied from R.R. is equally
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distributed and supplied to the front speaker FR and rear speaker RR installed on the right side in
the vehicle room, and the volume level of the audio signal is attenuated as necessary. -With da
10c It is made.
[0018]
The operation unit 21 includes a volume adjustment button 21a operated to adjust the main
volume level, a volume level of an audio signal supplied to the front speakers FL and FR
(hereinafter referred to as a volume level of the front speakers), and a rear speaker The balance
adjustment button 21b is operated to adjust the volume balance with the volume level of the
audio signal supplied to RL and RR (hereinafter referred to as the volume level of the rear
speaker).
Further, the volume adjustment button 21a supplies the microcomputer 25 with an electric
signal Sa indicating a volume level according to the amount of operation.
The balance adjustment button 21 b supplies the microcomputer 25 with an electric signal Sb
indicating an attenuation amount corresponding to the operation amount.
[0019]
Further, the microcomputer 25 receives the electric signal Sa or a supply signal Gy described
later, and supplies a control signal Va to the volume control unit 10a.
Also, the control signal F is supplied to the A fader 10 b and the B fader 10 c in response to the
supply of the electric signal Sb or a supply signal Gy described later.
[0020]
The display unit 24 displays numerical values indicating the volume level and the attenuation
amount according to the operation amount when the respective adjustment buttons of the
operation unit 21 described above are operated, and the RAM 26 displays data indicating the
volume level and the attenuation amount. Record.
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[0021]
Further, an external device 28 such as a navigation device is connected to the front speakers FL
and FR of the on-vehicle acoustic device 100 by a connection line such as a cable, and the audio
signals GL and GR supplied from the external device 28 are connected. It is outputted from those
speakers.
[0022]
Further, the external device 28 is connected to the microcomputer 25 of the in-vehicle acoustic
device 100, and supplies the microcomputer 25 with a supply signal Gy indicating that the audio
signal GL and the audio signal GR are supplied to each of the front speakers FL, FR. Do.
[0023]
Next, the functions of the operation unit 21 and the display unit 24 of the in-vehicle acoustic
device 100 will be described.
As shown in FIG. 2, a volume adjustment button 21 a, a balance adjustment button 21 b, and a
display unit 24 are provided on the operation panel 27 of the in-vehicle acoustic device 100.
[0024]
The volume adjustment button 21a is a rotatable button.
As shown in FIG. 2, the volume adjustment button 21a increases the main volume level when it is
rotated clockwise in the figure from the state where the terminal a is located on the center line
(indicated by the dotted line A in the figure). When turned counterclockwise in the figure, the
main volume level is operated to be attenuated.
When the terminal a of the volume adjustment button 21a is positioned on the center line, the
main volume level is set to a preset reference level.
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[0025]
The balance adjustment button 21 b is a rotatable button. As shown in FIG. 2, the balance
adjustment button 21b is formed by the output of the audio signal when it is rotated clockwise in
the figure from the state where the terminal b is located on the center line (indicated by the
dotted line B in the figure). Sound image is localized to the front side. That is, the volume level of
the front speaker is not attenuated, and only the volume level of the rear speaker is attenuated
according to the amount of rotation. In addition, when the terminal b of the balance adjustment
button 21b is rotated in the counterclockwise direction in the drawing from the state where the
terminal b is located on the center line, the sound image formed by the output of the audio signal
is localized backward. That is, the volume level of the rear speaker is not attenuated, and only the
volume level of the front speaker is attenuated according to the amount of rotation. When the
terminal b of the balance adjustment button 21b is positioned on the center line, the sound
image formed by the output of the audio signal is localized at the center. At this time, the volume
level of the front speaker and the volume level of the rear speaker are the same volume level,
that is, the main volume level.
[0026]
When the volume adjustment button 21a is operated by the user based on the display data Ma
from the microcomputer 25, the display unit 24 displays a numerical value indicating the main
volume level in stages according to the operation amount. In addition, when the balance
adjustment button is operated by the user, the display unit 24 gradually decreases the volume
level of the front speaker according to the operation amount, or the volume level attenuation of
the rear speaker Display a numerical value indicating.
[0027]
By configuring in this manner, the user can set the main volume level desired while visually
recognizing the numerical value displayed on the display unit 24. Further, the attenuation
amount or the rear level of the desired front speaker volume level can be set. The volume balance
can be adjusted by setting the amount of attenuation of the speaker volume level.
[0028]
Next, the internal configuration of the volume control unit 10a, the A fader 10b and the B fader
10c constituting the electronic volume 10 will be described with reference to FIG.
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[0029]
The volume control unit 10a includes two variable resistors 10a1 and 10a2.
The two variable resistors 10a1 and 10a2 change the main volume level by simultaneously
changing the resistances of the two variable resistors 10a1 and 10a2 based on the control signal
Va supplied from the microcomputer 25.
Then, the variable L channel and R channel audio signals are supplied to the A fader 10b and the
B fader 10c, respectively.
[0030]
The A fader 10 b includes two buffer amplifiers 10 b 1 and 10 b 2 and two variable resistors 10
b 11 and 10 b 21. One of the two variable resistors 10b11 and 10b21 is connected to the output
side of the two buffer amplifiers 10b1 and 10b2, and the other is connected to the ground
potential. Further, the B fader 10c, like the A fader 10b, is composed of two buffer amplifiers
10c1 and 10c2 and two variable resistors 10c11 and 10c21, and one of the two variable
resistors 10c11 and 10c21 is a two buffer It is connected to the output side of the amplifiers
10c1 and 10c2, and the other is connected to the ground potential.
[0031]
When the variable resistor 10b11 of the A fader 10b and the variable resistor 10c11 of the B
fader 10c are rotated counterclockwise from the state where the terminal b of the balance
adjustment button 21b is located on the center line, the control signal from the microcomputer
25 The resistance value is simultaneously changed by the same amount based on F. And each
fader supplies the audio signal of L channel and the audio signal of R channel attenuated by the
variable to front speakers FL and FR. Further, when the variable resistor 10b21 of the A fader
10b and the variable resistor 10c21 of the B fader 10c are rotated clockwise from the state
where the terminal b of the balance adjustment button 21b is located on the center line, the
control from the microcomputer 25 The resistance value is simultaneously changed by the same
amount based on the signal F. Then, each fader supplies the audio signal of L channel and the
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audio signal of R channel attenuated by the variable to the rear speakers RL and RR.
[0032]
In the state where the resistance value of the variable resistor 10b11 of the A fader 10b and the
resistance value of the variable resistor 10c11 of the B fader 10c are varied to attenuate the
volume level of the front speaker, the terminal of the balance adjustment button 21b is centered
When the operation positioned on the line is performed, each of the variable resistors changes
the resistance value to the value of the main volume level based on the control signal F from the
microcomputer 25. Further, in a state in which the resistance value of the variable resistor
10b21 of the A fader 10b and the resistance value of the variable resistor 10c21 of the B fader
10c are varied to attenuate the volume level of the rear speaker, the terminal of the balance
adjustment button 21b is centered When the operation positioned on the line is performed, each
variable resistor variably changes each resistance value to the main volume level based on the
control signal F from the microcomputer 25.
[0033]
When the external device 28 supplies the supply signal Gy from a state in which the volume level
of the rear speaker is attenuated by a predetermined amount by the user operating the balance
adjustment button 21b, the A fader 10b and the B fader 10c are operated. The microcomputer
25 automatically controls the volume level of the front speaker to attenuate to the minimum level
(for example, level 0).
[0034]
When the A fader 10b and the B fader 10c receive the control signal F from the microcomputer
25, first, the resistance value of each of the variable resistors 10b21 and 10c21 is changed from
the value of the volume level of the rear speaker to the value of the main volume level. Variable
to
Then, the resistance value of the variable resistors 10b11 and 10c11 is changed from the value
of the main volume level to the value of the minimum level.
[0035]
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10
Next, the control operation of the microcomputer 25 according to the present invention in the
present embodiment will be described using FIG. 4 and FIG. FIG. 4 shows a flow of control
operation activated in a state where the volume level of the rear speaker is attenuated by a
predetermined amount as an example, and is recorded in advance as an operation program in a
recording unit (not shown) built in the microcomputer 25 in advance. There is. FIG. 5 is a
diagram showing how the volume level of the front speaker, the volume level of the rear speaker,
and the main volume level are changed by the start of the operation program.
[0036]
First, in step S1, the microcomputer 25 reads out each data recorded in the RAM 26, changes the
resistance value of each of the variable resistors of the volume control unit 10a, the A fader 10b
and the B fader 10c, and responds to the data Set the main volume level, the volume level of the
front speakers and the volume level of the rear speakers.
[0037]
Next, in step S2, it is determined whether or not each adjustment button has been operated based
on the electrical signals supplied from each of the volume adjustment button 21a and the
balance adjustment button 21b.
When it is determined that any of the operation buttons has been operated (YES), the process
proceeds to step S3.
[0038]
Next, in step S3, when the user operates the volume adjustment button 21a, the control signal Va
is sent to the volume control unit 11 based on the electric signal Sa supplied from the volume
adjustment button 21a, and the main volume The level is adjusted, and data indicating the
volume level is recorded in the RAM 26. Further, when the balance adjustment button 21b is
operated in the clockwise direction shown in FIG. 2 by the user, the control signal Fb is sent out
based on the electric signal Sb supplied from the balance adjustment button 21b to change the A
fader 10b The variable resistor 10 c 21 of the resistor 10 b 21 and the B fader 10 c is varied, and
data indicating the amount of attenuation is recorded in the RAM 26.
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[0039]
Further, when the balance adjustment button 21b is operated in the counterclockwise direction
shown in FIG. 2 by the user, the control signal F is sent out based on the electric signal Sb
supplied from the balance adjustment button 21b, and the A fader 10b is The resistances of the
variable resistor 10b11 and the variable resistor 10c11 of the B fader 10c are varied, and data
indicating the amount of attenuation is recorded in the RAM 26. Next, the process proceeds to
step S1, and the operations after step S1 are executed.
[0040]
In step S2, when each operation button is not operated (NO), it transfers to step S4. In step S4,
the microcomputer 25 determines whether or not the audio signals GL and GR are supplied from
the external device 28 to the front speakers FL and FR, that is, whether or not the supply signal
Gy from the external device 28 has been received. When it is determined that the supply signal
Gy can not be obtained (NO), the process proceeds to step S1, and the operations after step S1
are performed. When it is determined in step S4 that the supply signal Gy is obtained from the
external device 28 (YES), the process proceeds to step S5.
[0041]
In step S5, the microcomputer 25 controls the A fader 10b and the B fader 10c so as to attenuate
the volume level of the front speakers to the minimum level. At this time, based on the control
signal F from the microcomputer 25, the A fader 10b and the B fader 10c try to vary the
resistance value of each of the variable resistors 10b21 and 10c21 to a value as the main volume
level.
[0042]
In step S6, the microcomputer 25 controls the A fader 10b and the B fader 10c, and at the same
time reads data indicating the attenuation amount of the volume level of the rear speaker from
the RAM 26 and forcibly forces the main volume level to that attenuation amount. The volume
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control unit 10a is controlled to attenuate. The volume control unit 10 a varies the resistance
value of the variable resistors 10 a 1 and 10 a 2 based on the control signal Va from the
microcomputer 25.
[0043]
Then, the A faders 10b and B faders 10c change the variable resistors 10b21 and 10c21 to their
attenuated main volume values, and then change the volume level of the front speaker to a
minimum level. The resistance values of the resistors 10b11 and 10c11 are varied.
[0044]
FIG. 5 shows how the main volume level, the volume level of the front speakers, and the volume
level of the rear speakers are changed by the processes of steps S5 and S6.
In the figure (to) indicates the main volume level adjusted by the volume control unit 11, in the
figure (to) indicates the volume level of the front speakers FL and FR, and in the figure (i)
indicates the place The volume level of the rear speakers RL and RR attenuated quantitatively is
shown.
[0045]
As can be seen from this figure, in order to localize the sound image formed by the output of the
audio signal to the center, the volume level of the rear speaker attenuated by a predetermined
amount tries to once rise in an attempt to become the main volume level (figure Because the
main volume level is attenuated (indicated by D in the figure) at the same time as the middle
arrow C), it is attenuated from the time when those levels become the same (indicated by E in the
figure) It is reflected in the main volume level and is finally set to the level that has been
attenuated by the initial predetermined amount. Then, the volume level of the rear speaker is
reflected in the attenuated main volume, and when the level is attenuated by a predetermined
amount, the volume level of the front speaker is attenuated to the minimum level.
[0046]
Then, after the volume level of the front speaker is attenuated to the minimum level, it is
determined in step S7 whether or not the supply signal Gy is obtained from the external device
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28, and it is determined that the supply signal Gy is obtained (YES ) Continuously monitor the
supply of the supply signal Gy.
[0047]
In step S7, when it is determined that the supply signal Gy can not be obtained from the external
device 28, that is, it is determined that the supply of the audio signals GL and GR from the
external device 28 to the front speakers FL and FR is completed (NO), Move to S8.
In step S8, each data recorded in the RAM 26 is read out, and the main volume level, the volume
level of the front speaker, and the volume level of the rear speaker are set based on the data.
Then, the process proceeds to step S1, and the operations after step S1 are continuously
executed.
[0048]
As described above, in the vehicle-mounted acoustic device 100 of the present embodiment, even
if audio information from the external device 28 such as a navigation device is output from the
front speakers FL and FR as interrupt information, the main volume level is set to the volume of
the rear speakers Since it is attenuated to the level, it is possible to suppress the user's sense of
hearing from being drawn backward as much as possible, and to accurately hear the audio
information from the external device 28 outputted from the front speakers FL, FR Can.
[0049]
Further, although the microcomputer 25 determines that the audio signals GL and GR are
supplied from the external device 28 to the front speakers FL and FR based on the activation
signal Gy from the external device 28, the external device 28 and the front speakers The
presence or absence of the supply of the audio signals GL and GR may be determined by
monitoring the connection line with the FL and FR.
[0050]
Further, although the audio signals GL and GR from the external device 28 are directly supplied
to the front speakers FL and FR, they may be supplied via the power amplifier 20.
[0051]
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Further, when an audio signal is supplied from the external device 28, the microcomputer 25
controls the A fader 10b and the B fader 10c to automatically attenuate the volume level of the
front speaker to the minimum level. For example, the operation panel 27 may be provided with a
mute button for attenuating the volume level to the minimum level, and it may be recognized that
the user operates the mute button to attenuate the volume level of the front speaker to the
minimum level .
[0052]
In the embodiment, the external device 28 is connected to the front speakers FL and FR.
However, the same effect can be obtained when the external device 28 is connected to the rear
speakers RL and RR.
At this time, when the audio signal from the external device 28 is supplied to the rear speakers
RL and RR in a state where the volume level of the front speaker is attenuated by a
predetermined amount, the main volume level is attenuated to the volume level of the front
speaker By controlling the volume control unit 11 so that the user's sense of listening can be
reduced to the front side as much as possible, the audio information from the external device 28
output from the rear speakers RL and RR can be reduced. It becomes possible to listen correctly.
[0053]
Although the embodiment of the present invention described above has been described by taking
the on-vehicle acoustic device as an example, the invention is not limited to this, and can also be
applied to, for example, an acoustic device forming a home theater installed in a house.
[0054]
Further, the present invention is an acoustic apparatus including a front speaker disposed on the
front side of a room and a rear speaker disposed on the rear side, and outputting audio
information of an external device from any one of the speakers. Any form may be used, and the
invention is not limited to the above-described embodiment of the on-vehicle acoustic device, and
various applications are possible without departing from the scope of the invention.
[0055]
According to the present invention, even when audio information from an external device is
interrupted and output, the volume level of the audio signal is attenuated to the volume level of
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the attenuated front speaker or rear speaker. By transferring the sound image formed by the
audio signal, it is possible to minimize the user's sense of listening from being drawn to the
transferred sound image side, and it is possible to correctly listen to the audio information of the
external device. It becomes.
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