JP2007043348

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DESCRIPTION JP2007043348
PROBLEM TO BE SOLVED: To provide an on-vehicle acoustic control device capable of moving a
sound image direction of a sound effect. SOLUTION: A sound effect generator 101L generates an
effect sound signal representing an effect sound for each of a plurality of speakers 108L from an
input sound signal. Here, the output timing and / or output level of the sound effect signal is
adjusted by the sound effect generator 101L for each speaker. Further, the adder 104L adds any
one of the sound effect signals generated by the sound effect generator 101L to the input sound
signal to generate an addition signal. The plurality of speakers 108L radiate the sound into the
vehicle compartment in accordance with the sound effect signal generated by the sound effect
generator 101L or the addition signal generated by the adder 104L. [Selected figure] Figure 1
Vehicle acoustic control device and method
[0001]
The present invention relates to an on-vehicle acoustic control device that controls the direction
of a sound image or controls spatiality by adding a sound effect exemplified in a reflected sound
and / or a reverberation in a vehicle interior.
[0002]
For example, as shown in FIG. 5, the conventional on-vehicle acoustic control device has
multipliers 501L, D / A converters 502L, amplifiers 503L and speakers 505L, and multipliers
501R, D / for each of left and right channels. An A converter 502R, an amplifier 503R and a
speaker 505R are provided.
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In order to control the multipliers 501L and 501R for both channels, the on-vehicle acoustic
control device includes a controller 506.
[0003]
In FIG. 5, when a vehicle direction signal representing the direction of the vehicle is input to
controller 506, controller 506 sets the coefficients of multipliers 501L and 501R according to
the current vehicle direction. Also, the left channel digital audio signal (hereinafter referred to as
Lch signal) is input to the multiplier 501L, and the multiplier 501L adjusts the level of the Lch
signal according to the set coefficient. The D / A converter 502L converts the level adjusted Lch
signal into an analog Lch signal. The amplifier 503L amplifies the analog Lch signal, and the
speaker 505L emits sound into the room of the vehicle 504 according to the amplified analog
Lch signal.
[0004]
Although the process of the configuration on the left channel side has been described above, the
process on the right channel side also performs the same process as described above.
[0005]
As a specific example of the process of the above-described in-vehicle acoustic control device,
when the vehicle direction signal indicates the left, the in-vehicle acoustic control device makes
the level of the Lch signal larger than that of the Rch signal, The sound image is in the left
direction (see, for example, Patent Document 1).
JP-A-63-219441 (page 7, FIG. 1)
[0006]
However, in the conventional on-vehicle acoustic control device, although the direction of the
sound image of the entire output sound could be changed, it was not possible to change only the
direction of the sound image of the sound effect.
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[0007]
The present invention has been made to solve the conventional problems, and it is an object of
the present invention to provide an on-vehicle acoustic control device capable of moving the
sound image direction of sound effects.
[0008]
In order to achieve the above object, an on-vehicle acoustic control device according to one
aspect of the present invention is an effect of expressing sound effects from a plurality of
speakers installed in a vehicle compartment and an input sound signal to each of the plurality of
speakers. And a sound effect generator for generating a sound signal.
Here, the output timing and / or output level of the sound effect signal is adjusted by the sound
effect generator for each speaker.
In addition, the vehicle-mounted acoustic control device further includes an adder that adds any
one of the sound effect signals generated by the sound effect generator to the input sound signal
to generate an addition signal. The plurality of speakers radiate the sound into the vehicle
compartment according to the sound effect signal generated by the sound effect generator or the
addition signal generated by the adder.
[0009]
According to this configuration, the sound image of the sound effect generated by the sound
effect generator can be moved.
[0010]
Further, when the vehicle speed signal representing the speed of the vehicle is input, the invehicle acoustic control device further sets the output timing and / or the output level for the
sound effects for each of the plurality of speakers according to the input vehicle speed signal.
According to this configuration, the in-vehicle acoustic control device can move the sound image
of the sound effect according to the vehicle speed.
[0011]
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The sound effect generator includes a reverberation sound generator that generates, as a sound
effect signal, a reflected sound signal representing a reflected sound of the sound represented by
the input sound signal.
The sound effect generator also includes a delay that delays the input sound signal by a set
amount, and / or a multiplier that adjusts the level of the input sound signal.
[0012]
With this configuration, it is possible to move the sound image of the sound effect, or change the
sound image moving effect of the sound effect according to the vehicle speed.
[0013]
In addition, the sound effect generator includes a reverberation sound generator that generates a
reverberation sound signal representing the reverberation sound of the sound represented by the
input sound signal.
Also, the reverberation sound generator is composed of a delay unit, a multiplier and an adder.
Specifically, the reverberation sound generator adjusts the level of the input sound signal,
performs addition processing using the first multiplier that generates the first multiplication
signal, and the input sound signal, and generates the first addition signal. A first adder for
generating, a first delay for delaying a first addition signal generated by the first adder to
generate a first delay signal, and a first delay for generating the first delay signal And a second
multiplier that generates a second multiplication signal and supplies the second multiplication
signal to the first adder. The first adder adds the input sound signal and the second
multiplication signal supplied from the second multiplier to generate a first addition signal. The
reverberation sound generator further adjusts the amplitude of the first delay signal generated
by the first delay unit to generate a third multiplication signal, and a third multiplier generated
by the third multiplier. A second adder generating a second addition signal by adding the signal
and the first multiplication signal generated by the first multiplier, and delaying the second
addition signal generated by the second adder; And a reverberation generator that generates a
reverberation signal representing the reverberation of the sound represented by the input
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acoustic signal.
[0014]
With this configuration, it is possible to move the sound image of the reverberation which is one
of the sound effects, or change the sound image movement of the reverberation according to the
vehicle speed.
[0015]
The sound image of the sound effect output from the speakers is moved by the plurality of
speakers emitting sound into the vehicle compartment according to the sound effect signal
generated by the sound effect generator or the addition signal generated by the adder. It is
controlled.
[0016]
Specifically, any one of the plurality of speakers is installed in front of the passenger of the
vehicle, and any one other is installed behind the passenger.
Here, the sound image of the sound effect is controlled to move in the front-rear direction of the
vehicle.
[0017]
More specifically, the sound effect generator gives a delay amount to the sound effect signal
which is an input signal to each speaker so that the sound image of the sound effect moves in the
longitudinal direction of the vehicle, or to each speaker Adjust the level of the sound effect signal
that is the input signal of
[0018]
With the above configuration, the sound image of the sound effect can be moved from the front
to the back or from the back to the front.
[0019]
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Further, to achieve the above object, a second aspect of the present invention is a method of
controlling sound output from a plurality of speakers installed in a vehicle compartment, the
method comprising: A sound effect generation step of generating a sound effect signal
representing a sound effect for each of the speakers.
Here, the output timing and / or output level of the sound effect signal is adjusted for each
speaker.
The method further includes adding one of the sound effect signals generated in the sound effect
generation step to the input sound signal to generate an addition signal, and generating sound
effects from the plurality of speakers. And emitting the sound into the vehicle compartment
according to the sound effect signal or the addition signal generated in the addition step.
[0020]
According to this configuration, the sound image of the sound effect generated from the sound
generation step can be moved.
[0021]
According to each of the above aspects, a sound effect is generated from the input sound signal.
Specifically, the output timing and / or output level of the sound effects output from the plurality
of speakers installed in the cabin are adjusted.
By this, it is possible to move the sound image of the sound effects output from the plurality of
speakers.
[0022]
Hereinafter, a vehicle-mounted acoustic control apparatus according to an embodiment of the
present invention will be described with reference to the drawings. First Embodiment FIG. 1 is a
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block diagram showing an overall configuration of a vehicle-mounted acoustic control device
according to a first embodiment of the present invention. In FIG. 1, an on-vehicle acoustic control
device is mounted on a vehicle, and a sound effect generator 101L including at least two sets of
delay units 102L and multipliers 103L (three sets are illustratively shown) for the left channel;
And an adder 104L. The on-vehicle acoustic control device further includes D / A converters
105L, amplifiers 106L, and speakers 108L, which correspond in number to the multipliers 103L,
as a configuration for the left channel. The on-vehicle acoustic control device also has a
configuration for the right channel, but the configuration for the right channel is the same as that
for the left channel described above, and thus the description thereof is omitted. The reference
numeral attached to the configuration for the right channel is suffixed with R to indicate the
right channel, in addition to the number.
[0023]
Hereinafter, the operation of the in-vehicle acoustic control device having the above-described
configuration will be described.
[0024]
The digital acoustic signal for the left channel (hereinafter referred to as Lch signal) is input to
each delay device 102L.
Each delay element 102L delays its own input Lch signal by a predetermined amount and
outputs it as a delay signal.
[0025]
The delay signal from the delay unit 102L of the previous stage is input to each multiplier 103L.
Each multiplier 103L adjusts the level of its own input delay signal. As a result, a reflected sound
signal which is an example of a sound effect is generated. Among the multipliers 103L of the
above-mentioned number, those not connected to the adder 104L give the generated reflected
sound signal to the D / A converter 105L of the subsequent stage.
[0026]
The Lch signal (direct sound component) described above and the reflected sound signal
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(reflected sound component) from the multiplier 103L of the previous stage are input to the
adder 104L, and the adder 104L is a reflected sound signal as the input Lch signal. Are added,
and the addition signal generated thereby is output to the D / A converter 105L of the
subsequent stage.
[0027]
Each D / A converter 105L converts an input addition signal or an input reflection sound signal,
each of which is a digital signal, into an analog signal, and outputs an addition signal or a
reflection sound signal, which is an analog signal, to the amplifier 106L of the subsequent stage
Do.
[0028]
Each amplifier 106L amplifies an output addition signal or an output reflected sound signal of
the D / A converter 105L at the front stage, and outputs the amplified signal to the speaker 108L
at the rear stage.
[0029]
Each speaker 108L is installed in the passenger compartment 107.
For example, if there are three speakers 108L, the first speaker 108L is in front of the passenger
of the vehicle in the passenger compartment 107, the second speaker 108L is behind the
passenger, and the third speaker 108L is It is installed at an intermediate position of the second
speaker 108L.
The speakers 108L installed in this manner emit sound into the passenger compartment 107 in
accordance with the addition signal or the reflected sound signal output from the amplifier 106L
at the front stage.
[0030]
The configuration for the right channel operates in the same manner as that for the left channel
described above.
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[0031]
Also, for example, when moving the sound image of the reflected sound from the front to the rear
of the passenger compartment 107, the speakers 108L installed in front of the passenger
compartment 107 sequentially input to the speakers 108L to the rear speakers 108L. The
amount of delay of each delay 102L is set so that the amount of delay of the signal is reduced.
Also, the coefficients of each multiplier 103L are set in the same order so that the level of the
input signal to each speaker 108L decreases.
The same applies to the configuration on the right channel side.
[0032]
The Lch signal (direct sound component) is input to the speaker 108L without processing for
moving the sound image, that is, the direct sound component is not delayed and amplified, so for
example, vocal The passenger does not receive an unnatural impression on the output sound,
such as the movement of the sound image of the direct sound component represented by the
whole.
[0033]
As described above, according to the on-vehicle acoustic control device according to the present
embodiment, the plurality of speakers 108L and 108R installed in the compartment 107 and the
acoustic signals for the left and right channels are used for the corresponding channels. Sound
effect generators 101L and 101R for generating a reflected sound signal as an example of the
sound effect of the sound source.
Specifically, the output timings of the sound effects output from the plurality of speakers 108L
and 108R are adjusted by the delay units 102L and 102R, and further, the output levels of the
sound effects are adjusted by the multipliers 103L and 103R. The on-vehicle acoustic control
device can move the sound images of the sound effects output from the speakers 108L and
108R.
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[0034]
In the above embodiments, the output timing and output level of the sound effects are adjusted,
but the sound control apparatus for vehicle is configured to adjust any one of the output timing
and the output level. It does not matter.
[0035]
Further, in the above embodiment, the delay unit 102L (or 102R) and the multiplier 103L (or
102L) are installed at the front stage and the multiplier 103L (or 102L) at the front stage,
respectively, of the delay unit 102L (or 102R) and the multiplier 103L (or 102L) in the same set.
It had been.
However, the present invention is not limited to this, and the multiplier 103L (or 102L) may be
installed at the front stage, and the delay device 102L (or 102R) may be installed at the rear
stage. Second Embodiment Next, a second embodiment of the present invention will be described.
FIG. 2 is a block diagram showing an overall configuration of a vehicle-mounted acoustic control
device according to a second embodiment of the present invention. In FIG. 2, in comparison with
the in-vehicle acoustic control device of the first embodiment, the in-vehicle acoustic control
device of the second embodiment substitutes the sound effect generators 201 L and 201 R
instead of the sound effect generators 101 L and 101 R. First of all, it differs in the point to
prepare.
[0036]
The sound effect generator 201L includes at least two sets of delay units 202L and multipliers
203L (three sets in the illustration).
[0037]
The Lch signal defined in the first embodiment is input to each delay unit 202L, and each delay
unit 202L delays its own input Lch signal by an amount set by a controller 204 described later to
delay the input Lch signal. Output as a signal.
[0038]
The delayed signal from the delay unit 202L of the previous stage is input to each multiplier
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203L.
Each multiplier 203L adjusts the level of its own delay signal with a coefficient set by the
controller 204 described later, and generates its own level-adjusted delay signal as a reflected
sound signal representing a reflected sound.
Further, among the multipliers 203L of the above number, those not connected to the adder
104L output the generated reflected sound signal to the D / A converter 105L of the subsequent
stage.
[0039]
The reference numeral attached to the configuration for the right channel is suffixed with
to indicate the right channel, in addition to the number.
R
[0040]
Further, the on-vehicle acoustic control device of the second embodiment is different from the
on-vehicle acoustic control device of the first embodiment in that the controller 204 is further
provided.
[0041]
The controller 204 receives a vehicle speed signal representing the current speed of the vehicle.
The controller 204 adjusts the delay amount of each of the delay devices 202L and 202R and the
coefficient of each of the multipliers 203L and 203R based on the input vehicle speed signal.
[0042]
There is no difference between the on-vehicle acoustic control devices of the two embodiments
other than the above.
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Therefore, in FIG. 2, the same reference numerals are given to the configurations corresponding
to those shown in FIG. 1, and the description thereof will be omitted.
[0043]
Hereinafter, an operation example of the on-vehicle acoustic control device having the abovedescribed configuration will be described.
[0044]
The controller 204 sets the delay amounts of the delay units 202L and 202R small, for example,
so that the sound image movement of the sound effects becomes faster as the vehicle speed
represented by the vehicle speed signal increases.
Thus, the in-vehicle acoustic control device accelerates the movement of the sound image of the
output sound when the vehicle speed increases. Also, the controller 204 increases the
coefficients of the multipliers 203L and 203R as the vehicle speed increases. By performing such
processing, when the vehicle speed increases, the passenger can clearly perceive the movement
of the sound image of the sound effect.
[0045]
As described above, according to the on-vehicle acoustic control device according to the present
embodiment, the plurality of speakers 108L and 108R installed in the compartment 107 and the
acoustic signals for the left and right channels are used for the corresponding channels. And a
controller 204 for controlling the sound effect generators 101L and 101R in accordance with the
vehicle speed signal. This makes it possible to change the sound image moving effect of the
sound effect (particularly, the reflected sound) to be output according to the vehicle speed. Third
Embodiment Next, a third embodiment of the present invention will be described. FIG. 3 is a
block diagram showing the overall configuration of a vehicle-mounted acoustic control device
according to a third embodiment of the present invention. In FIG. 3, the on-vehicle acoustic
control device according to the third embodiment is different from the on-vehicle acoustic
control device according to the second embodiment in that sound effect generators 301L and
301R are used instead of the sound effect generators 201L and 201R. The first difference is in
the provision of
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[0046]
The sound effect generator 301L has a pair of reverberation sound generator 304L and a
multiplier 305L (shown as one set) instead of the delay unit 202L and the multiplier 203L, as
compared with the above-described sound effect generator 201L. Differs in that it contains
[0047]
The Lch signal defined in the first embodiment is input to each reverberation sound generator
304L, and each reverberation sound generator 304L is configured to input its own input sound
signal according to the parameters set by the controller 306 described later. Generates and
outputs a reverberation signal representing a reverberation sound.
[0048]
Here, FIG. 4 is a block diagram showing one configuration example of the reverberation sound
generator 304L shown in FIG.
In FIG. 4, the reverberation sound generator 304L includes adders 401 and 402, multipliers 403
to 405, and delay devices 406 and 407.
[0049]
The aforementioned Lch signal is input to the multiplier 403.
The multiplier 403 adjusts the level of the input Lch signal and outputs it to the adder 402 as a
first multiplication signal.
[0050]
The Lch signal described above is also input to the adder 401. The adder 401 is further supplied
with a second multiplication signal from a multiplier 405 described later. The adder 401 adds the
second multiplication signal to the input Lch signal and supplies it to the delay unit 406 as a first
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addition signal.
[0051]
The delay unit 406 applies a predetermined amount of delay to the input first addition signal to
generate a first delay signal, which is applied to the multipliers 404 and 405.
[0052]
Multipliers 404 and 405 respectively adjust the level of the input first delay signal.
The multiplier 404 supplies the third multiplication signal generated thereby to the adder 402,
and the multiplier 405 supplies the second multiplication signal generated as described above to
the adder 401.
[0053]
The first multiplication signal and the third multiplication signal are input to the adder 402. The
adder 402 adds the input first and third multiplication signals to generate a second addition
signal, which is supplied to the delay unit 407.
[0054]
The delay unit 407 gives a predetermined amount of delay to the input second addition signal to
generate a reverberation sound signal. Such a reverberation sound signal has a large number of
reflected sound components for the sound represented by the Lch signal described above by the
feedback loop constituted by the adder 401, the delay unit 406 and the multiplier 405, and as a
result, the reverberation is reflected. The sound signal will represent the reverberation of that
sound.
[0055]
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Refer again to FIG. The reverberation sound signal from the reverberation sound generator 304L
of the previous stage is input to each multiplier 305L, and each multiplier 305L amplifies its own
input reverberation sound signal by a coefficient set by the controller 306 described later. It
generates a reverberation signal whose level has been adjusted, and outputs it to the D / A
converter 105L of the subsequent stage.
[0056]
The configuration for the right channel is the same as the configuration for the left channel, and
thus the description thereof will be omitted.
[0057]
Further, the on-vehicle acoustic control device of the third embodiment is different from the onvehicle acoustic control device of the second embodiment in that the controller 306 is further
provided.
[0058]
The controller 306 receives a vehicle speed signal representing the current speed of the vehicle.
Controller 306 is based on the input vehicle speed signal, the delay amount of each of delay units
202L and 202R, the amplification degree of each of multipliers 203L and 203R, the parameter of
each reverberation sound generator 304L and 304R, and each multiplier 305L. And adjust the
amplification degree of 305R.
[0059]
More specifically describing parameter control of each reverberation generator 304L and 304R,
the controller 306 changes the coefficient of the multiplier 405 in order to change the feedback
amount of the above-mentioned feedback loop, or the entire reverberation component. The delay
amount of the delay unit 407 is changed to change the delay amount of D. The coefficient of the
multiplier 304 is changed to change the size of the entire reverberation component.
[0060]
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As described above, according to the on-vehicle acoustic control device according to the present
embodiment, the plurality of speakers 108L and 108R installed in the compartment 107 and the
acoustic signals for the left and right channels are used for the corresponding channels. And a
controller 306 for controlling the sound effect generators 301L and 301R in accordance with the
vehicle speed signal.
This makes it possible to change the sound image moving effect of the sound effect (in particular,
reverberation) to be output according to the vehicle speed.
[0061]
The on-vehicle acoustic control device according to the present invention has an effect that the
sound image moving effect of sound effects can be changed, and it is possible to control the
direction of the sound image in the vehicle interior, or to generate reflected sound and / or
reverberation. It is useful as an on-vehicle acoustic control device or the like that controls
spatiality by adding sound effects.
[0062]
A block diagram showing a configuration of a vehicle-mounted acoustic control device according
to a first embodiment of the present invention A block diagram showing a configuration of a
vehicle-mounted acoustic control device according to a second embodiment of the present
invention 3 is a block diagram showing the detailed configuration of the reverberation sound
generator 301L or 301R shown in FIG. 3 a block diagram showing the configuration of a
conventional on-vehicle acoustic control device
Explanation of sign
[0063]
101L, 101R, 201L, 201R, 301L, 301R Sound effect generator 102L, 102R, 202L, 202R Delay
device 103L, 103R, 203L, 203R Multiplier 104L, 104R Adder 105L, 105R D / A converter 106L,
106R Amplifier 108L, 108R Speaker 204, 306 Controller 304L, 304R Reverberation sound
generator 305L, 305R Multiplier
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