close

Вход

Забыли?

вход по аккаунту

?

JPWO2017104054

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JPWO2017104054
Abstract: A volume control device is connected to an output unit disposed between a front seat
and a rear seat of a mobile unit. The volume control device estimates the frequency of the peak
of the sound output from the output unit, which is common to the frequency characteristics of
the front and rear seats, and corrects the level of the peak frequency of the sound output from
the output unit. As a result, the audio signal is controlled to correct the peak appearing
commonly in the frequency characteristics at the two listening positions of the front seat and the
rear seat.
VOLUME CONTROL DEVICE, VOLUME CONTROL METHOD, AND PROGRAM
[0001]
The present invention relates to a technique for adjusting a sound heard by a listener in a cabin
space.
[0002]
There has been proposed a method of adjusting the sound pressure level of reproduced sound in
an acoustic space such as a cabin.
For example, Patent Document 1 describes a method of collecting sound emitted from a plurality
of speakers by a plurality of microphones, measuring a sound pressure distribution in an acoustic
space, and determining a filter coefficient. In this document, a frequency band to which an
07-05-2019
1
equalizer should be applied is found by simulation or calculation for extracting a peak and a dip
based on frequency characteristics without considering a vehicle interior structure as a phase
correction method.
[0003]
JP, 2009-159385, A
[0004]
When an audio signal is reproduced in the passenger compartment, peaks and dips occur in the
frequency characteristics of the audio signal heard on each seat due to the reflection from the
door, window, seat, etc. of the passenger compartment.
Usually, since there are front and rear seats in the passenger compartment, it is desirable to
correct peaks and dips in frequency characteristics in both seats.
[0005]
For example, it is assumed that the sound of a specific band of the rear speakers is too loud for
the rear seater. In this case, if the sound in that band is reduced, it will be just better for the rear
seat people, but it will be difficult for the front seat people to hear the sound in that band. In such
a case, according to Patent Document 1, it is necessary to perform large-scale calculations each
time.
[0006]
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example. An object of the present invention is to provide a sound volume control device
capable of simultaneously correcting peaks of frequency characteristics at two front and rear
seats in a vehicle without requiring complicated calculations.
[0007]
07-05-2019
2
The invention according to claim 1 is a sound volume control device connected to an output unit
disposed between a front seat and a rear seat of a mobile object, wherein the front seat of the
sound output from the output unit And the estimation part which estimates the frequency of the
peak which is common to the frequency characteristic in the above-mentioned backseat, and the
amendment part which amends the level in the frequency of the peak of the sound outputted
from the above-mentioned output part.
[0008]
The invention according to claim 8 is a sound volume control method executed by a sound
volume control device connected to an output unit disposed between a front seat and a rear seat
of the moving body, and the output unit outputs the sound volume control method An estimation
step of estimating the frequency of a peak common to the frequency characteristics in the front
seat and the rear seat, and a correction step of correcting the level at the peak frequency of the
speech output from the output unit; It is characterized by having.
[0009]
The invention according to claim 9 is a program that is executed by a volume control device that
includes a computer and is connected to an output unit disposed between a front seat and a rear
seat of a moving body, and the output unit An estimation unit that estimates the frequency of a
peak common to the frequency characteristics of the front seat and the rear seat of the output
voice; and a correction unit that corrects the level of the peak of the voice output from the output
unit The computer is characterized by functioning.
[0010]
It is a top view which shows the example of the in-vehicle structure of a common sedan car.
1 shows a schematic configuration of a volume control device according to an embodiment.
It is a figure explaining the reason for which the zone where sound pressure becomes high by
two seats before and behind exists.
It is a figure explaining the method to determine a control zone based on the structure of
vehicles. It is a graph which shows the example of the zone where sound pressure becomes high
07-05-2019
3
by two seats before and behind. It is a graph which shows the effect of the method of a prior art
method, and the method of an Example. The structure of the volume control apparatus which
reproduces an audio | voice from a speaker on either side is shown. The frequency characteristic
at the time of inputting a stereo signal into a speaker on either side is shown. The frequency
characteristic at the time of inputting a monaural signal to a speaker on either side is shown. It is
a flowchart of attenuation control by the volume control apparatus of an Example. The example
of the in-vehicle environment in a modification is shown.
[0011]
In a preferred embodiment of the present invention, a volume control apparatus connected to an
output unit disposed between a front seat and a rear seat of the mobile body comprises: the front
seat and the front seat of the sound output from the output unit An estimation unit that estimates
the frequency of a peak common to frequency characteristics in the rear seat, and a correction
unit that corrects the level of the peak of the sound output from the output unit.
[0012]
The above-described volume control device is connected to an output unit disposed between the
front seat and the rear seat of the mobile unit.
The volume control device estimates the frequency of the peak of the sound output from the
output unit, which is common to the frequency characteristics of the front and rear seats, and
corrects the level of the peak frequency of the sound output from the output unit. As a result, the
audio signal is controlled to correct the peak appearing commonly in the frequency
characteristics at the two listening positions of the front seat and the rear seat.
[0013]
In one aspect of the above-described volume control device, the peak is output from the output
unit, and a direct sound, which is a sound that has reached the listening position without being
reflected in the moving body, and is output from the output unit, It is generated by
superimposing each of the reflected sound, which is the sound that has been reflected at a
predetermined position in the body and has reached the listening position. In this aspect,
correction is performed on the peaks generated by superposition of the direct sound and the
reflected sound.
07-05-2019
4
[0014]
In another aspect of the above-described volume control device, the estimation unit estimates the
frequency of the peak based on vehicle information of the moving body. In this aspect, the
frequency of the peak is determined based on the vehicle information of the moving body.
[0015]
Another aspect of the above-described volume control device includes an input unit for inputting
vehicle information of the moving body, and the estimation unit estimates the frequency of the
peak based on the input vehicle information. In this aspect, the frequency of the peak is
estimated based on the vehicle information input by the user. In a preferred example, the
estimation unit estimates the frequency of the peak according to a formula based on the vehicle
width of the moving body.
[0016]
In another aspect of the above-described volume control device, the output unit is disposed at a
position closer to the front seat or closer to the rear seat. By arranging the output unit closer to
the front seat or closer to the rear seat, a peak common to the frequency characteristics of the
front seat and the rear seat occurs.
[0017]
In another aspect of the above-described volume control device, the front seat or the rear seat
has a shield, and the shield outputs the output unit from the output unit and the shield is one of
the front seat or the rear seat. There is a partial occlusion in the audio to the listening position of
the existing seat. Due to the shielding by the front seat or rear seat shielding, a peak common to
the front seat and rear seat frequency characteristics occurs.
[0018]
07-05-2019
5
In another preferred embodiment of the present invention, a volume control method to be
executed by a volume control device connected to an output unit disposed between a front seat
and a rear seat of the mobile object is output from the output unit An estimation step of
estimating the frequency of a peak common to the frequency characteristics in the front seat and
the rear seat, and a correction step of correcting the level at the peak frequency of the speech
output from the output unit; Have. Also by this method, the audio signal is controlled to correct
the peak appearing commonly in the frequency characteristics in the two listening positions of
the front seat and the rear seat.
[0019]
In another preferred embodiment of the present invention, a program executed by a volume
control device comprising a computer and connected to an output unit disposed between a front
seat and a rear seat of the mobile body is from the output unit An estimation unit that estimates
the frequency of a peak common to the frequency characteristics of the front seat and the rear
seat of the output voice; and a correction unit that corrects the level of the peak of the voice
output from the output unit Make the computer function. By executing this program on a
computer, the audio signal is controlled to correct a peak appearing commonly in the frequency
characteristics at the two listening positions of the front and rear seats. This program can be
stored and handled in a storage medium.
[0020]
Basic Principle First, the basic principle of volume control according to the embodiment will be
described. The acoustic characteristics in the passenger compartment depend on the in-vehicle
structure of the vehicle, but a common vehicle has similar in-vehicle structure and speaker
positions. In a normal sedan car and the like, a driver's seat and a passenger's seat are disposed
symmetrically in the front seat, and two seats are disposed symmetrically in the rear seat. In
addition, front and rear speakers are installed on the left and right doors, respectively. Thus, in a
general vehicle, since the in-vehicle structure and the speaker position are similar, the way in
which sounds from the left and right rear speakers reach the front and rear seats is basically
similar in any vehicle.
[0021]
07-05-2019
6
FIG. 1 shows an example of the inside structure of a common sedan car. Assuming that the
vehicle 1 is a right-handed vehicle, the driver 5 sits in the front seat (driver's seat) 2 f and the
passenger 6 sits in the rear seat 2 r. A left rear speaker RL is provided at the left door of the rear
seat. Although the right rear speaker RR is provided on the right side door of the rear seat,
illustration is omitted in FIG.
[0022]
In such an in-vehicle structure and speaker position, when the front and rear 2 seats of the
vehicle, that is, the front seat 2f and the rear seat 2r are listening positions, and the audio
reproduced from one rear speaker is heard by these 2 seats, 2 A frequency band in which both
peaks appear in the frequency characteristics of the voice heard at the seat (hereinafter, also
simply referred to as a "band"). ) Exists. This sound is referred to as a voice that reaches the
listening position directly from the rear speaker provided on the door (hereinafter, referred to as
a "direct sound"). And sound that is reproduced from the rear speaker and reflected by the
opposite door to reach the listening position (hereinafter referred to as "reflected sound"). ) Are
superimposed on each other at the two-seat listening position.
[0023]
The “listening position” is the position of the head of the passenger sitting in the front seat or
the rear seat, and the “sound pressure at the listening position” is the sound pressure at the
center position of the head of the passenger or It is the sum of sound pressure at the positions of
the left and right ears. In the following description, “two seats” refers to two front and rear
seats, specifically, a combination of front and rear seats on the right side of the passenger
compartment, or front and rear seats on the left side. Do.
[0024]
As described above, in the sound volume control device according to the present embodiment,
the frequency characteristics of the audio signals listened to by the two seats of the vehicle both
have a peak (hereinafter also referred to as a “common peak band”). ) In the control band, and
by performing attenuation control of the audio signal reproduced from the rear speaker, the
07-05-2019
7
frequency characteristics in the two seats are simultaneously corrected.
[0025]
Embodiment (Basic Configuration) FIG. 2 shows a schematic configuration of a sound volume
control apparatus 10 according to the embodiment. In this embodiment, when audio is output
from at least one speaker to two seats of the vehicle, attenuation control is performed in a
specific control band of the audio signal supplied to the speakers. This attenuation control is
equalizer processing, gain adjustment processing, attenuation processing, and the like.
[0026]
Specifically, as shown in the example of FIG. 2, the audio signal output from the sound source 11
is supplied to the equalizer 12. The equalizer 12 performs control to attenuate the level of the
audio signal in the control band, and supplies the attenuated audio signal to the rear speaker RL
provided in the vehicle 1. The rear speaker RL reproduces the supplied audio signal and outputs
audio.
[0027]
A control unit 15 is connected to the equalizer 12, and an input unit 16 is connected to the
control unit 15. The input unit 16 is used when the user inputs vehicle information such as a
vehicle type name as described later. The control unit 13 supplies a signal indicating the control
band to the equalizer 12 based on the vehicle information input to the input unit 16. Specifically,
in the control unit 15, a vehicle information database (DB) in which vehicle information such as a
vehicle type name and a vehicle width of the vehicle type are stored is stored. When the user
inputs a vehicle type name into the input unit 16, the control unit 15 refers to the vehicle
information DB, acquires the vehicle width (w) of the vehicle type, and determines the control
band as described later using the vehicle width Do.
[0028]
As a result, in the sound volume control device of the present embodiment, it is possible to
07-05-2019
8
correct the peaks that appear together in the frequency characteristics of the sound heard by two
seats without the need for complicated calculations. In the above example, the voice is outputted
only from the left rear speaker RL of the vehicle, but the present invention can be similarly
applied to the case where the voice is outputted only from the right rear speaker RR.
[0029]
(Determination of Control Band) First, the reason why there is a common peak band in which the
sound pressure of the audio signal heard by the two seats of the vehicle simultaneously increases
will be described. FIGS. 3 (A) and 3 (B) schematically show the inside of the vehicle when the
passenger is on two seats. As shown in FIG. 3A, originally, the sound output from the rear
speaker RL can be easily transmitted only to the rear seat (hereinafter referred to as
“phenomenon 1”). This is a structure in which the backrest of the front seat, in particular the
front seat, shields the space between the front seat and the backseat, and the sound output from
the rear speaker RL is partially blocked by the backrest, and the front seat It is because it is hard
to convey to.
[0030]
On the other hand, as shown in FIG. 3 (B), the front seat is closer than the rear seat in the front
direction of the rear speaker RL, that is, in the direction in which the sound outputted from the
rear speaker RL proceeds (FIG. See circle 7)). Therefore, the direct sound and the reflected sound
output from the rear speaker RL are more likely to overlap or interfere with each other in the
front seat than in the rear seat (hereinafter referred to as “phenomenon 2”). Due to the
phenomenon 1 and the phenomenon 2 described above, a common peak band in which the
sound pressure of the audio signal simultaneously increases in the two front and rear seats
occurs.
[0031]
Although the degree of the above phenomenon 2 depends on the position in the front-rear
direction of the rear speaker RL, in a general vehicle, as shown in FIG. 3 (B), the rear speaker is a
position closer to the front seat, specifically The above phenomenon 2 occurs because the sensor
is often disposed closer to the front seat than the middle position between the front and rear
seats.
07-05-2019
9
[0032]
Next, the frequency of the above-mentioned common peak band (hereinafter also referred to as
“common peak frequency”).
The determination method of) will be described. FIG. 4 shows an example of the in-vehicle
structure. The sound output from the rear speaker RL reaches the front seat 2f and the rear seat
2r as a direct sound as shown in the route S, and is reflected by the right door, and is reflected on
the front seat 2f and the rear seat 2r as a reflected sound. To reach. Thus, since the direct arrival
sound and the reflected sound reach the front seat 2f and the rear seat 2r as listening positions,
the direct arrival sound and the reflected sound are added together in the band where the direct
arrival sound and the reflected sound are in phase. Peaks in the frequency characteristics. The
frequency at which this peak occurs is the common peak frequency.
[0033]
The common peak frequency can be determined based on the size of the vehicle. As shown in
FIG. 4, assuming that the vehicle width in the vehicle is “w”, the common peak frequency
Fpeak is obtained by Fpeak [Hz] = C [m / s] / D [m] (1). “C” is the sound velocity (340 ms), and
D (= 2 w) is the distance until the sound output from the rear speaker RL is reflected by the
opposite door and returned to the position of the rear speaker, ie, 4 is the distance of the path S
shown in FIG.
[0034]
Now, assuming that w = 1.4 m as the width of a general vehicle, according to equation (1), the
common peak frequency Fpeak is about 121 Hz. The frequency characteristics in the front seat
(driver's seat) and the rear seat in this case are shown in FIG. 5 (A). As indicated by the oval 70, a
common peak occurs in the front and rear seats in the band around 125 Hz.
[0035]
(Attenuation Control) Thus, when the common peak frequency as the control band is determined,
07-05-2019
10
the control unit 15 controls the equalizer 12 to attenuate the signal level of the band of the
common peak frequency. Specifically, as illustrated in FIG. 5B, the control unit 15 sets, in the
equalizer 12, a characteristic that attenuates the signal level near the common peak frequency.
As a result, it is possible to correct peaks that occur simultaneously in the two front and rear
seats due to the in-vehicle structure.
[0036]
FIG. 6 shows a graph comparing the embodiment in which the damping control is performed
with the conventional example. The graph G1 shows the frequency characteristic of the front seat
according to the embodiment, and the graph G2 shows the frequency characteristic of the rear
seat according to the embodiment. The graph G3 shows the frequency characteristics of the front
seat according to the conventional example, and the graph G4 shows the frequency
characteristics of the rear seat according to the conventional example. The graphs G3 and G4 of
the conventional example are graphs in the case where the band of the peak frequency (about
300 Hz) generated in the frequency characteristic in the rear seat is attenuated by the equalizer.
In each graph, the solid line is the characteristic when the attenuation processing by the
equalizer is turned off, and the broken line is the characteristic when the attenuation processing
by the equalizer 12 is turned on. In both graphs, the listening position is the position of the left
ear of the passenger's head.
[0037]
In the conventional example, as shown by the solid line in the ellipse 74 of the graph G4, a peak
occurs in the frequency characteristic of the rear seat in the band around 300 Hz. For this
reason, when the equalizer for attenuating the band near 300 Hz is turned on, as shown by the
broken line in the ellipse 74, the frequency characteristic of the rear seat becomes flat in the
band near 300H. However, as shown by the solid line in the ellipse 73 of the graph G3, a peak
does not exist in the vicinity of 300 Hz originally in the front seat, so turning on the equalizer
that attenuates the band near 300 Hz, as shown by the broken line in the ellipse 73. In the front
seat, a dip occurs around 300 Hz, and the frequency characteristic is deteriorated.
[0038]
On the other hand, in the embodiment, as shown by the solid line in the ellipse 71 of the graph
07-05-2019
11
G1 and the solid line in the ellipse 72 of the graph G2, peaks occur in both the front and rear
seats near 125 Hz corresponding to the common peak frequency. It occurs. Therefore, when the
equalizer for attenuating the band around 125 Hz is turned on, as shown by the broken line in
the ellipse 71 of the graph G1 and the broken line in the ellipse 72 of the graph G2, the peak is
relaxed in both of the two seats before and after Characteristics are improved. As described
above, in the present embodiment, by attenuating the band of the common peak frequency that
causes peaks simultaneously in both the front and rear two seats, it is possible to simultaneously
improve the frequency characteristics in both the front and rear two seats.
[0039]
[Other Embodiments] In the above-described embodiment, the sound is output from only one of
the rear speakers of the vehicle. However, the present invention can be applied to the case where
the sound is output from the left and right rear speakers. FIG. 7 shows a configuration for
inputting signals to the left and right rear speakers RL, RR. Specifically, the audio signal output
from the sound source 11 is input to the equalizer 12, and the equalizer 12 supplies the audio
signal in which the level of the control band is attenuated to the left and right rear speakers RL
and RR.
[0040]
In a general vehicle interior structure, left and right rear speakers RL and RR are installed at
symmetrical positions. Therefore, the sound output from the rear speaker RR on the right side
also reaches the front seat 2f and the rear seat 2r as direct arrival sound, and reaches the front
seat 2f and the rear seat 2r as reflected sound reflected by the left door. Therefore, even when
voices are output from the left and right speakers RL and RR, the common peak in the frequency
characteristics of the front seat 2f and the rear seat 2r can be simultaneously suppressed by
attenuating the volume level of the control band by one equalizer 12. be able to. Hereinafter, the
case of the stereo signal and the monaural signal will be respectively described.
[0041]
(In the case of stereo signals) In the case of stereo signals, uncorrelated signals are input to the
left and right rear speakers RL and RR, but in both of the two front and rear seats, direct sounds
from the left and right rear speakers RL and RR Since the reflected sound reflected by the door
07-05-2019
12
on the opposite side forms a peak frequency, the peak frequencies of the sounds output from the
left and right rear speakers RL and RR become the same. Therefore, if attenuation control is
performed in the peak frequency band by one equalizer, the peaks of the sound output from the
two rear speakers RL and RR can be simultaneously suppressed.
[0042]
FIG. 8 shows frequency characteristics when stereo signals are input to the left and right rear
speakers RL and RR in the configuration of FIG. FIG. 8A shows frequency characteristics of the
front seat (driver's seat) 2 f and the rear seat 2 r. As shown by the ellipse 75, a common peak
appears around 125 Hz. Therefore, with the common peak frequency of 125 Hz as the center
frequency of the control band, the attenuation characteristic shown in FIG. Thereby, in the front
seat 2 f and the rear seat 2 r, the frequency characteristics shown in FIG. 8C can be obtained. As
shown by the ellipse 76 in FIG. 8C, the common peak near 125 Hz is suppressed.
[0043]
In the case of a monaural signal, the same signal is input to the left and right speakers FL and FR.
Therefore, even when a monaural signal is input to the left and right rear speakers RL and RR, if
the attenuation control is performed in the peak frequency band by one equalizer, as in the case
where the signal is input to only one speaker, two rear It is possible to simultaneously suppress
the peaks of the sound output from the speakers RL and RR.
[0044]
FIG. 9 shows frequency characteristics when monaural signals, ie, the same signal, are input to
the left and right front speakers FL and FR in the configuration of FIG. FIG. 9A shows the
frequency characteristics of the front seat (driver's seat) 2 f and the rear seat 2 r. As shown by
the ellipse 77, a common peak appears around 125 Hz. Therefore, the peak frequency of 125 Hz
is set as the center frequency of the control band, and the attenuation characteristics shown in
FIG. Thereby, in the front seat 2f and the rear seat 2r, the frequency characteristics shown in FIG.
9C can be obtained. As shown by the ellipse 78 in FIG. 9C, the common peak near 125 Hz is
suppressed.
07-05-2019
13
[0045]
As described above, by applying the same attenuation processing to the audio signals output
from the left and right rear speakers RL and RR, a common peak occurring in the two front and
rear seats in the vehicle, that is, the front passenger seat and the rear seat It can also be
suppressed. As a result, it is possible to obtain the effect of simultaneously suppressing the
common peak for the four seats in the vehicle.
[0046]
[Attenuation Control] FIG. 10 is a flowchart of attenuation control executed by the volume
control device 10 of the embodiment. This process is mainly executed by the control unit 15 of
the volume control device 10. Specifically, it is implemented by the computer that configures the
control unit 15 executing a prepared program.
[0047]
First, when the user inputs vehicle information such as a vehicle type name into the input unit
16, the control unit 15 acquires the input vehicle information (step S11), and acquires the vehicle
width of the vehicle type from the vehicle information DB (step S12). ). Next, the control unit 15
determines the common peak frequency Fpeak based on the above-mentioned equation (1) (step
S13), and sets a characteristic for attenuating the signal in the common peak band to the
equalizer 12 (step S14). Then, the control unit 15 controls the sound source 11 to output an
audio signal. Thus, the sound output from the rear speaker is the one in which the common peak
is suppressed.
[0048]
[Modification] In the above embodiment, the rear speaker RL is close to the front seat, and the
backrest of the front seat is a shield that shields the space of the front seat and the space of the
rear seat. Instead, the present invention can be applied to an in-vehicle environment in which the
rear speaker RL is close to the rear seat and the rear seat has a shield. FIG. 11 shows an example
of an in-vehicle environment having a shield at the rear seat. In the example of FIG. 11, the rear
speaker RL is close to the rear seat. The front seat 2f faces the rear of the vehicle and faces the
07-05-2019
14
rear seat 2r. And, instead of the backrest of the front seat in the above embodiment, a shield X is
present between the front seat 2f and the rear seat 2r. Examples of the shield X include a
partition, a large screen television, a desk, and the like. Even in this in-vehicle environment, the
sound output from the rear speaker RL is partially blocked by the shield X, and it becomes
difficult to transmit to the rear seat. Thus, the present invention can be applied to an in-vehicle
environment in which the rear speakers are close to either the front seat or the rear seat and the
close seat has a shield.
[0049]
In the above embodiment, it is assumed that the signal in the common peak band is attenuated
by the equalizer 12. However, as a practical process, a process in which only the signal in the
common peak band is attenuated and the signal levels in other bands are maintained.
Alternatively, the signal level in the common peak band may be relatively attenuated by
enhancing the signal level in the other bands while maintaining the signal level in the common
peak band.
[0050]
The vehicle width acquired by the control unit 15 when determining the common peak
frequency, that is, the vehicle width to be stored in the vehicle information DB, is optimal to use
the width of the interior of the compartment.
However, if it is difficult to obtain the width of the interior, the width of the exterior described in
the catalog of the vehicle may be used instead. Further, a value obtained by subtracting a value
corresponding to the thickness of a general door from the width of the exterior may be stored in
the vehicle information DB.
[0051]
In the above embodiment, the vehicle information DB is prepared in the control unit 15 mounted
on the vehicle, but instead, the vehicle information DB is prepared in a server or the like, and the
control unit 15 mounted on the vehicle communicates The vehicle width may be acquired from
the server according to Specifically, the control unit 15 may transmit vehicle information such as
a vehicle type name input to the input unit 16 to the server, and receive the vehicle width of the
vehicle type from the server and use it.
07-05-2019
15
[0052]
The present invention can be used for a sound reproduction device mounted on a vehicle.
[0053]
1 vehicle 2f front seat (driver's seat) 2r rear seat 10 volume control device 11 sound source 12
equalizer 15 control unit 16 input unit
07-05-2019
16
Документ
Категория
Без категории
Просмотров
0
Размер файла
27 Кб
Теги
jpwo2017104054
1/--страниц
Пожаловаться на содержимое документа