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DESCRIPTION JP2012206617

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DESCRIPTION JP2012206617
An object of the present invention is to make a sense level of an acoustic signal heard by a
listener located in each seat in a vehicle substantially uniform, even if a noise level generated by
traveling of the vehicle varies depending on a position in the vehicle. A seat-by-seat
compensation level setting unit 104 exists in a vehicle situation (for example, around a vehicle)
based on a compensation level set according to a noise signal in the vehicle by a frequency bandby-band-band compensation level setting unit 102. According to the distance and the direction to
the object, the compensation level associated with each of the plurality of acoustic signal output
devices 500 installed in the vehicle is set, and the compensation processing unit 105 sets the
acoustic signal supplied from the outside to In contrast, by performing the compensation process
based on the compensation level associated with each of the plurality of acoustic signal output
devices, acoustic characteristics different in each of the plurality of acoustic signal output devices
according to the noise in the vehicle and the condition of the vehicle Outputs an acoustic signal
having [Selected figure] Figure 1
Automotive sound processing system
[0001]
The present invention relates to an on-vehicle acoustic processing device that performs
compensation processing of an acoustic signal reproduced inside a vehicle (inside the vehicle) in
consideration of the influence of noise from outside the vehicle (outside the vehicle).
[0002]
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In Patent Document 1 below, the frequency component analysis means analyzes the frequency
characteristics of the noise signal collected in the vehicle, and the compensation level setting
means for each frequency band sets the compensation amount of the sense level for each
frequency band, There is disclosed a technique for compensating the sense level of the listener in
the vehicle by changing the frequency characteristics of the audio signal to be reproduced in the
vehicle based on the setting.
Further, Patent Document 1 discloses a technique of estimating noise characteristics in the
vicinity of the listener's ear position from the collected noise signal and compensating the sense
level using the estimated noise signal in the vicinity of the listener's binaural position. It is done.
[0003]
JP-A-9-148867 (paragraphs [0011]-[0018], FIG. 1, FIG. 2)
[0004]
According to the technology disclosed in Patent Document 1, it is possible to perform the audio
signal compensation process so as to compensate for the specific listener's sense level present in
the vehicle.
However, although there is a difference in noise level in each seat in the vehicle, it is necessary to
set a uniform compensation level, and sense levels of a plurality of listeners located in each seat
in the vehicle are made substantially uniform. I could not do that.
[0005]
The present invention solves the above problem, even if the noise level generated by the
traveling of the vehicle varies depending on the position in the vehicle, the sense of the acoustic
signal heard by the listener located in each seat in the vehicle An object of the present invention
is to provide an on-vehicle acoustic processing device capable of making the level substantially
uniform.
[0006]
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In order to achieve the above object, an on-vehicle acoustic processing device according to the
present invention performs a compensation process on an acoustic signal output in the vehicle
according to a noise level of a noise signal acquired in the vehicle. A first compensation level
setting unit configured to set a first compensation level; and a plurality installed in the vehicle
from the first compensation level set by the first compensation level setting unit according to the
condition of the vehicle A second compensation level setting unit for setting a second
compensation level associated with each of the acoustic signal output devices, and the second
compensation level setting unit for the acoustic signal supplied from the outside; And a
compensation processing unit that performs compensation processing based on each of the
compensation levels, and generates an acoustic signal to be output in each of the plurality of
acoustic signal output devices.
According to this configuration, even when the noise level generated by the traveling of the
vehicle varies depending on the position in the vehicle, the sense level of the acoustic signal
heard by the listener located at each seat in the vehicle can be made substantially uniform. It
becomes possible.
[0007]
The on-vehicle acoustic processing device according to the present invention can detect the
sensory level of the acoustic signal heard by the listener located at each seat in the vehicle even
if the noise level generated by the traveling of the vehicle varies depending on the position in the
vehicle. It has the effect that it can be made substantially uniform.
[0008]
Block diagram showing an example of the configuration of a vehicle-mounted acoustic processing
apparatus according to an embodiment of the present invention Sensory level characteristics in a
noiseless environment according to an embodiment of the present invention Sense in a noise
environment according to an embodiment of the present invention Level characteristic chart
Characteristic chart showing an example of sensory level compensation under noise environment
in the embodiment of the present invention In an embodiment of the present invention, an
external situation showing an example when noise levels at left and right seats in the vehicle are
different Explanatory diagram A characteristic diagram showing another example of sensory
level compensation under noise environment according to the embodiment of the present
invention
[0009]
Hereinafter, a vehicle-mounted acoustic processing device according to an embodiment of the
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present invention will be described using the drawings.
[0010]
FIG. 1 is a diagram showing an example of a configuration of an on-vehicle system including an
on-vehicle acoustic processing device according to an embodiment of the present invention.
The in-vehicle system 10 illustrated in FIG. 1 includes an in-vehicle acoustic processing device
100, an in-vehicle noise collection device 200, an out-of-vehicle information output device 300,
an acoustic signal generator 400, and an acoustic signal output device 500.
The in-vehicle acoustic processing device 100 is connected to each of the in-vehicle noise
collection device 200, the external information output device 300, the acoustic signal generator
400, and the acoustic signal output device 500.
[0011]
The in-vehicle noise collection device 200 is composed of, for example, a microphone installed in
the vehicle, a microphone amplifier for amplifying an electric signal output from the microphone,
and the like. It has a function of outputting as a signal (electric signal).
[0012]
In addition, the external information output device 300 has a function of acquiring and
outputting information (external information) for detecting a situation outside the vehicle.
For example, the extra-vehicle information output device 300 detects time information (time
information indicating a distance to an object around the vehicle) from emission of an emission
wave to reflection on an object around the vehicle and reception as a reflection wave. It is
comprised by a sound wave sensor etc., and it is possible to output said time information as
information outside a vehicle.
Note that the vehicle is provided with, for example, an ultrasonic sensor that detects an object
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present on the right side of the vehicle and an ultrasonic sensor that detects an object present on
the left side of the vehicle, and identifies the ultrasonic sensor that detects the object. Thus, it is
possible to specify at which position (or in which direction) the object is present outside the
vehicle.
[0013]
Further, the acoustic signal generation device 400 is an audio reproduction device such as a CD
(Compact Disc: Compact Disc) player or an HDD (Hard Disk Drive: hard disk drive) player, for
example, and uses an acoustic signal (audio signal) as an electrical signal. It has a function to
output.
[0014]
The acoustic signal output device 500 is, for example, an audio output device such as a speaker
or an amplifier, and has a function of converting an acoustic signal (audio signal) into vibration
(sound).
In the vehicle, a plurality of sound signal output devices 500 are installed.
[0015]
Further, the in-vehicle acoustic processing apparatus 100 includes a frequency analysis unit 101,
a frequency band compensation level setting unit 102, an external condition analysis unit 103, a
seat compensation level setting unit 104, and a compensation processing unit 105.
[0016]
The frequency analysis unit 101 is connected to the in-vehicle noise collection device 200
through the noise signal input terminal 120, analyzes the frequency characteristics of the noise
signal supplied from the in-vehicle noise collection device 200, and It has a function of
outputting analysis information (frequency characteristics) to the frequency band separate
compensation level setting unit 102.
[0017]
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Further, the compensation level setting unit 102 for each frequency band sets the compensation
level so that the listener's sense level in the vehicle becomes a constant level for each frequency
band, and sets the compensation level for each frequency band to the compensation level for
each seat It has a function of outputting to the unit 104.
The compensation level set by the frequency band compensation level setting unit 102 is
uniformly set according to the noise level of the noise signal, and at this point in time, the
difference between the noise levels at the respective seats in the vehicle is Not considered.
[0018]
In addition, the external condition analysis unit 103 is connected to the external information
output device 300 via the external information input terminal 130, analyzes external information
supplied from the external information output device 300, and includes information including
the analysis result ( It has a function of outputting information on the condition outside the
vehicle) to the compensation level setting unit 104 for each seat.
As described above, the outside-vehicle information supplied from the outside-vehicle
information output device 300 is, for example, time information indicating the distance (and
direction) to an object around the vehicle, and the outside-vehicle situation analysis unit 103
determines this based on the time information. , The presence or absence of an object around the
vehicle, and further the distance (and direction) from the vehicle if an object is present, analyze
the analysis result outside the vehicle situation (presence or absence of an object around the
vehicle, distance and direction) And output to the compensation level setting unit 104 for each
seat.
[0019]
In addition, the seat level compensation level setting unit 104 receives the compensation level of
each frequency band supplied from the frequency band type compensation level setting unit 102
according to the vehicle exterior condition information supplied from the vehicle outside
situation analysis unit 103 for each seat. It has a function of changing the sense level of the
listener so as to be substantially uniform, and outputting the compensation level of each
frequency band changed according to the external situation information to the compensation
processing unit 105. A plurality of sound signal output devices 500 are installed in the vehicle,
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and the seat level compensation level setting unit 104 sets each sound signal output device 500
so that the listener's sense level of each seat becomes substantially uniform. Different
compensation levels are set. That is, the per-seat compensation level setting unit 104 sets the
compensation level associated with each sound signal output device 500.
[0020]
For example, the seat level compensation level setting unit 104 acquires the presence / absence,
distance, and direction of an object around the vehicle from the outside situation analysis unit
103 as vehicle external condition information, The noise level differences at the seat are
estimated to set the compensation levels associated with each acoustic signal output device 500.
As will be described later, the seat level compensation level setting unit 104 relates to each
sound signal output device 500 according to the external condition information by referring to a
predetermined correspondence table or performing a predetermined calculation. It is possible to
set the compensation level.
[0021]
Further, the compensation processing unit 105 is connected to the acoustic signal generator 400
via the acoustic signal input terminal 140, and the compensation level setting unit 104 for each
acoustic signal supplied from the acoustic signal generator 400 is used. A compensation process
is performed based on the compensation level associated with each acoustic signal output device
500 supplied, and the acoustic signal after the compensation process is output to the
corresponding acoustic signal output device 500 via the speaker-by-speaker acoustic signal
output terminal 150 Have a function to The compensation level supplied from the seat-by-seat
compensation level setting unit 104 is associated with each acoustic signal output device 500,
and the compensation processing unit 105 applies each of the acoustic signal supplied from the
acoustic signal generator 400 to each. By adjusting the frequency characteristics based on the
compensation level associated with the acoustic signal output device 500, an acoustic signal to
be output to each acoustic signal output device 500 is generated.
[0022]
Here is a brief explanation of the sense level. The sensation level is defined as the difference
between the input sound pressure level and the minimum audible level of the band in the
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amplitude frequency characteristic when a certain acoustic signal is presented. FIG. 2 is an
example showing the sensation level in the absence of noise, in which an acoustic signal is
presented with an amplitude frequency characteristic indicated by a solid line and the minimum
audible level is a dotted line. The sense level in the absence of noise is represented by the shaded
area in FIG. However, the sense level may be a difference between the input sound pressure level
and a value obtained by multiplying the minimum audible level of the band by a constant
multiple in the amplitude frequency characteristic when a certain acoustic signal is presented.
[0023]
FIG. 3 shows the case where noise is present in the amplitude frequency characteristic
represented by a broken line, and the sense level at that time is as shown by the hatched portion
in FIG. Decreases. Therefore, in order to compensate for the decrease in the sense level, the
frequency characteristic of the acoustic signal is changed by the amount of the compensation
level in FIG.
[0024]
Next, a specific example of the acoustic signal output realized by using the on-vehicle acoustic
processing device according to the embodiment of the present invention will be described.
[0025]
FIG. 5 shows an example in which the noise levels at the left and right seats are different.
FIG. 5 shows a situation where the soundproof wall 1100 (object) exists on the left side with
respect to the traveling direction of the vehicle 1000. In such a situation, the noise level of the
left side seat where the reflection from the sound barrier 1100 is large is higher than the noise
level of the right side seat. That is, the noise felt by the listener sitting in the left seat in the
vehicle is larger than the noise felt by the listener sitting in the right seat, and the compensation
level for the acoustic signal is uniformly set according to the noise level of the noise signal.
However, the sense level of the listener sitting in the left seat and the sense level of the listener
sitting in the right seat may not be substantially uniform with respect to the sound signal.
[0026]
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In the situation illustrated in FIG. 5, the ultrasonic sensor (outside information output device
300) detects the soundproof wall 1100 present on the left side of the vehicle 1000, and time
information indicating the distance from the vehicle 1000 to the soundproof wall 1100 Get
information). The external condition analysis unit 103 analyzes the time information supplied
from the ultrasonic sensor, and information including the presence of an object (soundproof wall
1100) on the left side of the vehicle 1000 and the distance and direction to the soundproof wall
1100. (Outside status information) is output.
[0027]
On the other hand, the microphone (in-vehicle noise collection device 200) installed in the
vehicle 1000 collects noise generated in the vehicle under the influence of the sound barrier
1100 existing on the left side of the vehicle 1000. The frequency analysis unit 101 analyzes the
collected noise and outputs analysis information (frequency characteristics) of each frequency
band of the noise, and the frequency band separate compensation level setting unit 102
determines each frequency band based on the frequency characteristics. Output the
compensation level of
[0028]
The seat level compensation level setting unit 104 determines the noise level at the left seat in
the vehicle 1000 and the noise level at the right seat in the vehicle 1000 based on the vehicle
exterior condition information including the distance and direction to the soundproof wall 1100
acquired from the vehicle exterior condition analysis unit 103. A process of estimating the
difference from the noise level is performed. For example, the seat-by-seat compensation level
setting unit 104 sets the distance difference between the left and right objects (the difference
between the distance to the object existing on the left side of the vehicle 1000 and the distance
to the object existing on the right side of the vehicle 1000). It holds a correspondence table
showing the relationship with the noise level difference (sound pressure difference) in the seat,
and with reference to this correspondence table, in the left and right seats in vehicle 1000
generated by objects existing around vehicle 1000 Estimate the noise level difference.
[0029]
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And the compensation level setting part 104 classified by seat produces | generates the acoustic
signal output from each acoustic signal output device 500 based on the noise level in the
estimated seat on either side. Specifically, in a situation where the listener in the left seat feels a
louder noise than the listener in the right seat under the influence of the sound barrier 1100
present on the left side of the vehicle 1000, it is disposed on the left in the vehicle 1000 The
sound pressure of the acoustic signal output from acoustic signal output device 500 (speaker
1200 a in FIG. 5) is the acoustic signal output from acoustic signal output device 500 (speaker
1200 b in FIG. 5) disposed on the right side in vehicle 1000. The sound signal output from each
sound signal output device 500 (speaker 1200a and speaker 1200b in FIG. 5) is generated so as
to be larger than the sound pressure. For example, the compensation process is performed on the
acoustic signal output from the acoustic signal output device 500 (the speaker 1200a in FIG. 5)
disposed on the right side in the vehicle 1000 so as to have the characteristics illustrated in FIG.
For the acoustic signal output from acoustic signal output device 500 (speaker 1200a in FIG. 5)
disposed on the left side in vehicle 1000, the characteristic shown in FIG. 6 (compensation for
compensating for a larger noise level) Compensation processing is performed to achieve the level
As described above, the seat-by-seat compensation level setting unit 104 individually
compensates the acoustic signals output from the respective acoustic signal output devices 500
according to the situation outside the vehicle, thereby enabling the listeners sitting on the left
and right seats. It becomes possible to make sense level substantially uniform.
[0030]
In the above-mentioned example, although the situation where the object (soundproof wall 1100)
is present on the left side of the vehicle 1000 is described, the same applies to the case where an
object is present on the right side of the vehicle 1000. By individually compensating the acoustic
signals output from the signal output device 500, it is possible to make the sense level of the
listener sitting in the left and right seats substantially uniform. Also, the object detected around
the vehicle 1000 is not limited to the sound barrier 1100, and may be any object such as a wall
of a central separation band or another vehicle.
[0031]
Also, when the vehicle 1000 is traveling, noise level differences occur on the left and right (at the
left and right seats) with respect to the traveling direction of the vehicle 1000. It is desirable to
perform compensation processing individually on the acoustic signal output from the acoustic
signal output device 500, but the installation position and number of the acoustic signal output
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device 500 in the vehicle 1000, the characteristics of noise, the sound field in the vehicle It is
possible to set the compensation level of the acoustic signal in each acoustic signal output device
500 in more detail according to the environment or the like. The correspondence table includes
external condition information output from the external condition analysis unit 103 and a
compensation level that makes the listener's sense level of each seat in the vehicle 1000
substantially uniform (compensation level of acoustic signal in each acoustic signal output device
500) The information that indicates the relationship with the vehicle, and by setting the optimum
correspondence table according to each vehicle or each vehicle type, it is an acoustic that makes
the listener's sense level in each seat approximately uniform with higher accuracy. Output of the
signal is feasible.
[0032]
Further, in the above example, a compensation level (a sound in each sound signal output device
500) makes the sense level of the listener of each seat in the vehicle 1000 substantially uniform
with respect to the outside situation information output by the outside situation analysis unit
103. Although the correspondence table in which the compensation level of the signal is
described is used, calculation is performed using a predetermined function in which the
compensation level of the acoustic signal in each acoustic signal output device 500 is output with
the external situation information as the input. It is also good.
[0033]
Further, the noise signal generated in the vehicle 1000 is mainly constituted by the low
frequency band, and the frequency band in which the acoustic signal is subjected to the
compensation processing is also mainly low frequency depending on the frequency characteristic
of the noise signal. The band is targeted.
From this, for example, the compensation process according to the present invention may be
performed only on an acoustic signal output from a low frequency band speaker installed in the
vehicle 1000.
[0034]
The on-vehicle acoustic processing device according to the present invention can detect the
sensory level of the acoustic signal heard by the listener located at each seat in the vehicle even
if the noise level generated by the traveling of the vehicle varies depending on the position in the
vehicle. It has an effect that it can be made substantially uniform, and can be applied to an
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acoustic processing technology that performs compensation processing of an acoustic signal that
is difficult to hear due to noise.
[0035]
DESCRIPTION OF SYMBOLS 10 in-vehicle system 100 in-vehicle acoustic processing device 101
frequency analysis part 102 frequency band compensation level setting part 103 vehicle external
condition analysis part 104 seat compensation level setting part 105 compensation processing
part 120 noise signal input terminal 130 car external information input terminal 140 acoustic
signal Input terminal 150 Speaker-specific sound signal output terminal 200 In-car noise
collection device 300 Car-external information output device 400 Sound signal generator 500
Sound signal output device 1000 Vehicle 1100 Soundproof wall (object) 1200a, 1200b Speaker
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