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JP2013211625

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DESCRIPTION JP2013211625
Abstract: [Problem] When two different sound sources are reproduced simultaneously in a
vehicle compartment, it is possible to perform correction processing without increasing noise
even when the frequency band differs depending on the type of sound source, and the priority is
When set, it is possible to more effectively eliminate the influence of the other sound source.
SOLUTION: Sound source analysis information supplied from frequency analysis means 104 and
105 for analyzing two types of sound sources reproduced in a vehicle and sound source supplied
from sound source type analysis means for analyzing two types of sound source types The
correction characteristic is calculated by the correction characteristic calculation unit 107 based
on the type information and the priority supplied from the user side priority setting unit 103
which sets the priority by the user, and the front seat correction characteristic setting unit 108,
the rear seat correction By setting the correction characteristics in the characteristic setting
means 109, the correction characteristics matching the front seat sound source and the rear seat
sound source are added and output. [Selected figure] Figure 1
Automotive sound processing system
[0001]
The present invention relates to an on-vehicle acoustic processing device that performs
correction processing of an acoustic signal reproduced in a vehicle in consideration of the mutual
influence of two sound sources when two types of sound sources are reproduced simultaneously
in a vehicle compartment.
[0002]
According to Patent Document 1 below, when two types of sound sources are reproduced
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simultaneously in a vehicle, the two types of sound sources are respectively analyzed by the
frequency analysis means so that the sense levels for each frequency band of the two sound
sources become identical. Discloses a technique for performing correction processing.
[0003]
JP, 2008-203716, A
[0004]
According to the technology disclosed in Patent Document 1, it is possible to minimize the
influence of each other's sound sources at the trial listening position when two types of sound
sources are simultaneously reproduced in the vehicle compartment.
However, when there is a large difference between the two types of sound sources, for example,
when the sound sources have different frequency bands, such as voice and music, the same
processing can not but be performed. There is a problem that the noise increases by performing
the correction.
In addition, even in the case where the two types of sound sources are sound sources of similar
frequency bands, the influence of each other can not be completely eliminated.
[0005]
In order to solve the above problems, the present invention can perform correction processing
without increasing noise even when the frequency band differs depending on the type of sound
source, and when the priority is set, the other one An object of the present invention is to provide
an on-vehicle acoustic processing device capable of eliminating the influence more effectively.
[0006]
In order to achieve the above object, according to the vehicle-mounted acoustic processing
device of the present invention, an acoustic signal for the front seat and a rear seat for the
different sound signals reproduced simultaneously for the front seat and for the rear seat in the
same vehicle interior space One of the sound signals for the seat is used as a sound source and
the other is used as noise, and the sense level to be attenuated by the noise signal as the other
noise of the sound signal serving as one sound source is calculated. Correction characteristic
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calculation means for outputting as a correction characteristic for correcting an acoustic signal to
be a sound source;
[0007]
This configuration makes it possible to reduce the influence of each other's sound sources
without increasing noise even if the types of two sound sources reproduced simultaneously in
the vehicle compartment are different.
[0008]
In addition, a priority setting means for setting the priority of the front seat acoustic signal and
the rear seat acoustic signal is provided, and the correction characteristic calculation means is an
acoustic signal that is a sound source that is one of the higher priority acoustic signals. I assume.
[0009]
With this configuration, by setting the priority, it is possible to more effectively eliminate the
influence of the other sound signal on one side (front seat sound source or rear seat sound
source).
[0010]
Further, the correction characteristic calculation means sets priorities of the front seat acoustic
signal and the rear seat acoustic signal based on the sound source type information of the front
seat acoustic signal and the rear seat acoustic signal, and gives priority. Let the sound signal of
the higher degree be the sound signal that is one sound source.
Alternatively, the correction characteristic calculation means sets the priority of the narrower
one of the frequency bands higher among the sound signal for the front seat and the sound
signal for the rear seat, and the sound signal having the higher priority is the one sound source
And an acoustic signal.
[0011]
Also according to these configurations, the priority is set in the same manner as described above,
and in one (front seat sound source or rear seat sound source), the influence of the other acoustic
signal can be more effectively eliminated.
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[0012]
The on-vehicle acoustic processing device according to the present invention has the effect of
reducing the effects of each other's sound sources without increasing noise, even when the types
of two sound sources reproduced simultaneously in the vehicle compartment are different.
In addition, the influence of the other sound source can be more effectively eliminated on one
side (front seat sound source or rear seat sound source) by setting the priority.
[0013]
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
Flow chart showing processing of characteristic chart correction characteristic calculating means
107 showing an example of correction of sensation level under noise environment in the
embodiment of the present invention In the embodiment of the present invention, in the same
vehicle interior space Explanation of the situation when different sound sources are played
simultaneously
[0014]
Hereinafter, a vehicle-mounted acoustic processing device according to an embodiment of the
present invention will be described using the drawings.
The embodiment of the present invention described below shows a preferred specific example of
the present invention.
The numerical values, the shapes, the components, the arrangement and the connection form of
the components, and the like described in the present embodiment are merely examples, and are
not intended to limit the present invention.
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The present invention is limited only by the claims.
Therefore, among the components in the following embodiments, components not described in
the independent claims are described as constituting a more preferable embodiment although
not necessarily required to achieve the object of the present invention. Ru.
[0015]
FIG. 1 is a diagram showing an example of the configuration of a vehicle-mounted acoustic
processing device according to an embodiment of the present invention.
The on-vehicle acoustic processing apparatus 100 illustrated in FIG. 1 includes a front seat sound
source device 101, a rear seat sound source device 102, a user side priority setting unit 103, a
front seat sound source frequency analysis unit 104, and a rear seat sound source frequency
analysis unit 105. Sound source type analysis means 106, correction characteristic calculation
means 107, front seat correction characteristic setting means 108, rear seat correction
characteristic setting means 109, separate speaker front seat signal output terminal 110,
separate speaker rear seat signal output terminal 111 There is.
[0016]
The front seat sound source device 101 and the rear seat sound source device 102 are, for
example, an audio output device such as a CD (Compact Disk) or a DVD (Digital Versatile Disc), or
a tuner device such as a television or radio. It has a function of outputting (electrical signal).
[0017]
In addition, the front seat sound source device 101 and the rear seat sound source device 102
have a function of outputting the type information of the sound source being output and the set
volume value.
[0018]
Here, the sound source type information refers to the type of sound source output from a sound
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source device such as BD (Blu-ray), DVD, CD, USB (Universal Serial Bus), AUX, FM radio, AM
radio, terrestrial digital, navigation audio, etc. Point to information.
In addition, BD, DVD, USB, AUX, etc. can include audio (music) format information such as
MPEG2 (Moving Picture Experts Group phase 2), AC3 (Audio Code number 3), LPCM (Linear
Pulse Code Modulation) and the like.
[0019]
The user-side priority setting unit 103 has an interface function configured of buttons, switches,
etc. which can be operated by the user, selects front seat sound source priority, rear seat sound
source priority, automatic etc., and selects the selected priority Output degree information.
[0020]
The 104 to 109 are typically configured to include a CPU, a ROM, and a RAM, and the CPU
executes a computer program stored in advance in the ROM using the RAM.
[0021]
The front seat sound source frequency analysis means 104 is connected to the front seat sound
source device 101, analyzes the frequency characteristics of the music and audio signals supplied
from the front seat sound source device 101, and analyzes the information of each frequency
band (frequency characteristics) Are output to the correction characteristic calculation means
107.
[0022]
The rear seat sound source frequency analysis means 105 is connected to the rear seat sound
source device 102, analyzes the frequency characteristics of the music and audio signals supplied
from the rear seat sound source device 102, and analyzes the analysis information of each
frequency band (frequency characteristics) Are output to the correction characteristic calculation
means 107.
[0023]
Further, the sound source type analysis unit 106 is connected to the front seat sound source
device 101 and the rear seat sound source device 102, and the sound source type information
and volume value (VOL information supplied from the front seat sound source device 101 and
the rear seat sound source device 102) ) Is output to the correction characteristic calculation
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means 107.
[0024]
Further, when the sound source type information can not be obtained from the front seat sound
source device 101 and the rear seat sound source device 102, the sound source type analysis
means 106 is connected to the front seat sound source frequency analysis means 104 and the
rear seat sound source frequency analysis means 105. Thus, the sound source type can be
determined from the frequency characteristics supplied from the front seat sound source
frequency analysis means 104 and the rear seat sound source frequency analysis means 105,
and the sound source type information can be output to the correction characteristic calculation
means 107.
[0025]
The correction characteristic calculation unit 107 is connected to the user side priority setting
unit 103, the front seat sound source frequency analysis unit 104, the rear seat sound source
frequency analysis unit 105, and the sound source type analysis unit 106. Processing is
performed based on the supplied priority information.
When the priority is automatic, first, the priority is selected based on the sound source type
information supplied from the sound source type analysis unit 106.
As the priority, a sound source with a narrow frequency band (for example, voice) has less
influence on the other sound source, so the priority of the sound source with a narrow frequency
band is set high.
For example, sound sources of almost voice signals such as navigation voice, AM radio and traffic
information can be set to have higher priority than sound sources estimated to be almost music
such as CD and USB.
[0026]
In addition, the correction characteristic calculation means 107, based on the frequency
characteristics supplied from the front seat sound source frequency analysis means 104 and the
rear seat sound source frequency analysis means 105 after the priority information is
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determined, is the sound source on the side of hearing priority. The correction characteristic is
calculated and output so as not to be influenced by the sound source on the side where priority is
not given.
[0027]
Further, the correction characteristic calculation means 107 performs processing on the entire
band if the sound source to be preferentially corrected based on the sound source type
information supplied from the sound source type analysis means 106 is a sound source having a
narrow frequency band such as voice. In addition, it has a function of calculating and outputting
the correction characteristic so that the correction processing is performed only in a band where
the signal level is actually large.
[0028]
The front seat correction characteristic setting unit 108 and the rear seat correction
characteristic setting unit 109 perform a correction process based on the correction
characteristic supplied from the correction characteristic calculation unit 107, and have a
function of outputting a voice and a music signal (electric signal).
[0029]
The voice and music signals supplied from the front seat correction characteristic setting means
108 and the rear seat correction characteristic setting means 109 are set for each sound source
by the front seat signal output terminal 110 for each speaker and the rear seat signal output
terminal 111 for each speaker. Output to the speaker.
[0030]
Here, a brief description will be given of the correction process when two sound sources are
simultaneously reproduced in the vehicle compartment.
If two sources are played simultaneously, there is no correlation between the two sources.
Therefore, when one sound source is auditioned, the other sound source becomes noise.
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Although correction processing is performed for the purpose of eliminating the influence of
noise, processing is performed to keep the sense level constant.
The sensation level is defined as the difference between the input sound pressure level and the
minimum audible level of the band in the 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.
[0031]
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 correct the decrease in the sense level, the frequency characteristic of the
acoustic signal is changed by the amount of the correction level in FIG.
[0032]
Next, the flow of processing of the correction characteristic calculation means 107 will be
described using the flowchart of FIG.
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First, the correction characteristic calculation unit 107 determines whether the priority
information supplied from the user side priority setting unit 103 is automatic (Auto) (step S501).
If it is not automatic (Auto) (No in step S501), the process proceeds to step S502, and the
correction characteristic calculation unit 107 determines whether the priority is the front seat.
When the priority is the front seat (Yes in step S502), the front seat sound source is used as a
sound source, and the rear seat sound source is treated as noise (step S504). On the other hand,
when the priority is the rear seat at step S502 (No), the rear seat sound source is used as a sound
source, and the front seat sound source is treated as noise (step S505).
[0033]
In step S501, when the priority information is automatic (Auto) (Yes), the correction
characteristic calculation unit 107 causes the front seat sound source band received from the
front seat sound source frequency analysis unit 104 to be the rear seat sound source frequency
analysis unit 105. It is determined whether it is narrower than the band of the rear seat sound
source received from (step S503). If the band of the front seat sound source is narrower (Yes in
step S503), the correction characteristic calculation unit 107 sets the priority of the front seat
sound source higher (step S504) because the influence on the rear seat sound source is small. .
On the other hand, if the rear seat sound source band is narrower at step S503 (No), the
correction characteristic calculation unit 107 sets the rear seat sound source priority higher
because the influence on the front seat sound source is small. Step S505). Then, the process
proceeds to step S506.
[0034]
In step S506, the correction characteristic calculation unit 107 calculates the noise characteristic
at the listening point (the frequency characteristic of the noise signal shown in FIG. 3). Here,
when the front seat sound source becomes noise, the frequency characteristic in which the signal
reproduced from the front seat speaker is transmitted to the rear seat listening point is stored in
a memory (not shown in FIG. 1) in advance. By convolving the characteristics with the front seat
sound source characteristics received from the front seat sound source frequency analysis means
104, the frequency characteristics of the noise signal are calculated. Similarly, when the rear seat
sound source becomes noise, the frequency characteristic in which the signal reproduced from
the rear seat speaker is transmitted to the front seat listening point is stored in a memory (not
shown in FIG. 1) in advance. By convolving the characteristics with the rear seat sound source
characteristics received from the rear seat sound source frequency analyzing means 105, the
frequency characteristics of the noise signal are calculated. Then, the process proceeds to step
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S507.
[0035]
In step S507, the correction characteristic calculation unit 107 calculates the sound source
characteristic (the frequency characteristic of the acoustic signal shown in FIG. 3) at the listening
point. Here, when the front seat sound source is a sound source, frequency characteristics in
which the signal reproduced from the front seat speaker is transmitted to the front seat listening
point are stored in a memory (not shown in FIG. 1) in advance. By convolving the characteristics
with the front seat sound source characteristics received from the front seat sound source
frequency analyzing means 104, the frequency characteristics of the acoustic signal are
calculated. Similarly, when the rear seat sound source is a sound source, a frequency
characteristic in which a signal reproduced from the rear seat speaker is transmitted to the rear
seat listening point is stored in a memory (not shown in FIG. 1) in advance. By convolving the
characteristics with the rear seat sound source characteristics received from the rear seat sound
source frequency analyzing means 105, the frequency characteristics of the acoustic signal are
calculated. Then, the process proceeds to step S508.
[0036]
In step S508, from the frequency characteristics of the acoustic signal calculated in step S507,
the frequency band where the sound actually exists is calculated. Here, when the acoustic signal
is voice or AM radio, the frequency characteristic of the acoustic signal takes a smaller value in
the low band or the high band than in the middle band. Therefore, the lower limit and the upper
limit of the frequency above a certain amount (for example, -20 dB etc.) compared to the level in
the middle range are calculated, the interval between them is the frequency band of the sound
signal, and the frequency characteristic in that band is calculated as the sound source
characteristic Do. Then, the process proceeds to step S509.
[0037]
In step S509, the correction characteristic of the sound source is calculated from the noise
characteristic calculated in step S506 and the sound source characteristic calculated in step
S508. Here, the sense level in FIG. 4 is the frequency characteristic of the acoustic signal
calculated in step S507, and the noise signal in FIG. 4 is the noise characteristic calculated in step
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S506. The sensation level attenuated by the noise signal is calculated, and the attenuated
sensation level is used as the correction characteristic.
[0038]
Next, in step S510, it is determined whether the correction characteristic calculated in step S509
is not zero. If it is not 0 (YES in step S510), the process advances to step S511 to set the noise
correction characteristic to 0. If it is 0 (NO in step S510), the process proceeds to step S512 to
calculate a noise correction characteristic. Here, the case where the correction characteristic of
the sound source is 0 means that the noise characteristic is very small relative to the sound
source characteristic, etc., and the sense level does not change due to the presence or absence of
noise. However, a range in which no change occurs in the sensation level is calculated and taken
as a noise correction characteristic. Then, in step S513, the sound source correction
characteristic and the noise correction characteristic are output, and the correction characteristic
calculation unit 107 ends the processing flow.
[0039]
In the above step S 503, the bands of the front seat sound source and the rear seat sound source
are compared and which is to be prioritized is set, but the priority is selected based on the sound
source type information supplied from the sound source type analysis unit 106 You may
[0040]
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.
[0041]
FIG. 6 shows an example in the case where another sound source is reproduced in the front seat
and the rear seat in the vehicle interior of the vehicle 1000.
Front seat speakers 1300 a and 1300 b reproduce signals obtained from the front seat signal
output terminal 110 for each speaker toward the front seat 1100.
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The rear seat speakers 1400 a and 1400 b reproduce the signal obtained from the rear seat
signal output terminal 111 by speaker for the rear seat 1200. As described above, when two
different sound sources are reproduced in the same space, the sound of the rear seat sound
source in the front seat 1100 and the sound of the front seat sound source in the rear seat 1200
become noises, which hinders audition.
[0042]
In the situation illustrated in FIG. 6, the priority is first determined by the user side priority
setting means 103, and it is determined which of the front seat 1100 and the rear seat 1200 is to
be prioritized. When the user selects automatic, the correction characteristic calculation unit 107
determines the priority based on the sound source type information supplied from the sound
source type analysis unit 106.
[0043]
For example, when the front seat 1100 is prioritized as a priority, the sound transmitted from the
rear seat speakers 1400a and 1400b and transmitted to the front seat 1100 is treated as noise,
and the front seat 1100 senses the sense level as shown in FIG. Make corrections for
[0044]
In addition, when the signal reproduced from the front seat speakers 1300a and 1300b is a
signal with a narrow frequency band such as voice, the sensory level is corrected only in the
frequency band in which the signal exists based on the sound source type analysis information. .
[0045]
In addition, when the signal reproduced from the rear seat speakers 1400a and 1400b is small to
the extent that the front seat 1100 does not need to be subjected to correction processing, it is
necessary to correct the sensation level of the front seat 1100. Make corrections to the rear seat
sound source up to the level of
[0046]
As described above, the on-vehicle acoustic processing device according to the present invention
reduces the effects of each other's sound sources without increasing noise even if the types of
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two sound sources reproduced simultaneously in the vehicle compartment are different. can do.
Also, the influence of the other sound source can be eliminated on one side (front seat sound
source or rear seat sound source) by setting the priority.
[0047]
In the present embodiment, the on-vehicle acoustic processing device is described as including
the front seat sound source device 101 and the rear seat sound source device 102, but the front
seat sound source device 101 installed outside is not included in the configuration. The front seat
sound source output from the rear seat sound source device 102, the rear seat sound source, and
the like may be input.
[0048]
According to the vehicle-mounted acoustic processing device of the present invention, even when
two different sound sources are reproduced in the same vehicle interior space, one of the front
and rear seats hears the sense level of the acoustic signal that the listener listens to It has an
effect that it can be kept constant, and is useful as an on-vehicle apparatus such as an on-vehicle
audio apparatus.
[0049]
DESCRIPTION OF SYMBOLS 100 in-vehicle acoustic processing device 101 front sound source
device 102 rear seat sound source device 103 user side priority setting means 104 front seat
sound source frequency analysis means 105 rear seat sound source frequency analysis means
106 sound source type analysis means 107 correction characteristic calculation means 108 front
seat Correction characteristic setting unit 109 Rear seat correction characteristic setting unit
110 Front seat signal output terminal for each speaker 111 Rear seat signal output terminal for
each speaker 1000 Vehicle 1100 Front seat 1200 Rear seat 1300a, 1300b Front seat speaker
1400a, 1400b Rear seat speaker
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