close

Вход

Забыли?

вход по аккаунту

?

JP2007109328

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 JP2007109328
To suppress noise when changing a mode of dynamic range control processing for a sound
signal. A control unit (31) sets a DRC mode in a decoding device (10) based on a DRC mode
change instruction input via a user interface (32). The CPU 221 acquires the decoder information
121 and the DRC information 122 from the decoding device 10, acquires the gain coefficient
from the gain coefficient table 23 based on these, and after the change of the DRC mode is
completed in the decoding device 10, the level control unit Set the gain factor to 24. The level
control unit 24 controls the gain coefficient set in the coefficient multiplier 21 to gradually
change from the original gain coefficient to the new gain coefficient. [Selected figure] Figure 1
Playback device
[0001]
The present invention relates to a playback device.
[0002]
In recent years, sound signals have often been recorded as digital data, and methods of
compressing digital sound signals such as Dolby (registered trademark) digital, DTS (Digital
Theater System), AAC (Advanced Audio Coding), etc. are known.
For example, when decoding a digital sound signal compressed by a subband coding method,
each subband sample of bit stream data is generated by an inverse quantization circuit provided
09-05-2019
1
corresponding to each of bit stream data of a plurality of channels. There has been proposed a
decoder for performing inverse quantization for each subband, combining each subband output
of a plurality of inverse quantization circuits for each corresponding subband, and combining the
combined output into subbands (for example, Patent Document) 1).
[0003]
Further, there has been proposed an output characteristic setting device for obtaining a gain
coefficient based on envelope information of outputs of mixer means for a plurality of input
signals and performing dynamic range control based on the gain coefficient (for example, see
Patent Document 2) ).
[0004]
Dynamic range control (hereinafter referred to as DRC) of Dolby Digital.
) Has four modes: maximum DRC mode, standard DRC mode, minimum DRC mode, and television
DRC mode.
[0005]
The compression characteristics of each mode are shown in FIG. 6, FIG. 7 and FIG. FIG. 6 is a
diagram showing the compression characteristics (Gstd) of the standard DRC mode in
comparison with the maximum DRC mode (Gmax). FIG. 7 is a diagram showing the compression
characteristics (Gmin) in the minimum DRC mode, and FIG. 8 is a diagram showing the
compression characteristics (Gtv) in the television DRC mode.
[0006]
[0007]
Table 1 shows how to set each DRC mode.
09-05-2019
2
As shown in Table 1, when setting the DRC mode, the operation mode and the scale factor are set
for the decoder, and necessary gain adjustment is performed. The operation mode is a standard
operation mode defined by Dolby Digital, and there are two modes: line mode and RF (Radio
Frequency) mode. The scale factor is a factor that allows compression control of parts of large
and small sounds.
[0008]
Although depending on the implementation method of the decoder, the general decoder IC may
implement three modes of maximum DRC mode, standard DRC mode, and television DRC mode,
but may not implement minimum DRC mode . Therefore, in products equipped with Dolby Digital
DRC, when setting to the minimum DRC mode, after setting the decoder to the television DRC
mode, gain adjustment of -11 dB using a coefficient multiplier or a gain adjustment circuit etc. It
is carried out.
[0009]
FIG. 9 shows a functional configuration of a playback apparatus 300 equipped with a
conventional Dolby Digital DRC. The playback device 300 is configured of a decoding device 50,
a gain adjustment device 60, a control device 70 that controls these, and a D / A conversion unit
80.
[0010]
The decoding device 50 includes a decoding processing unit 51, a register 52, and an interface
53. The decoding processing unit 51 selects a decoder adapted to the stream from among the
decoder 511 for Dolby digital, the decoder 512 for DTS, the decoder 513 for PCM (Pulse Code
Modulation), and the decoder 514 for AAC using the selection switch 515 And perform
decryption processing. Also, in the case of Dolby Digital, DRC processing is performed
simultaneously. The register 52 holds decoder information 521 indicating a currently selected
decoder, DRC information 522 indicating a currently set DRC mode, and the like. The interface
53 mediates the exchange of data with the control device 70.
09-05-2019
3
[0011]
The gain adjustment device 60 includes a coefficient multiplier 61 and an interface 62. The
coefficient multiplier 61 performs gain adjustment for each channel on the sound signal output
from the decoding device 50. The interface 62 mediates the exchange of data with the control
device 70.
[0012]
The control device 70 includes a control unit 71, a user interface 72, and an interface 73. The
control unit 71 sets the DRC mode in the decoding device 50, and sets an appropriate gain
coefficient in the gain adjustment device 60. The user interface 72 receives a DRC mode change
instruction from the user. The interface 73 mediates the exchange of data with the decoding
device 50 and the gain adjustment device 60. JP, 2002-49394, A JP, 8-70225, A
[0013]
However, unlike PCM, a compressed sound signal such as Dolby Digital requires data of a certain
sample to be taken as one frame, and therefore, must be decoded frame by frame. For example,
in Dolby Digital, data for 1536 samples is defined as one frame. Therefore, at the time of
compressed sound signal input, the decoding device 50 needs to perform decoding processing
and DRC processing on a frame basis. Therefore, even if the control device 70 instructs the
decoding device 50 to change the DRC mode, the DRC mode of the decoding device 50 is actually
changed with a delay of several thousand samples.
[0014]
On the other hand, in order to handle the sound signal decoded into PCM, the gain adjustment
device 60 performs gain adjustment for each sample. Therefore, when the control device 70
changes the gain coefficient of the gain adjustment device 60, the gain adjustment device 60
performs gain adjustment with the changed gain coefficient immediately.
[0015]
09-05-2019
4
Therefore, when the control device 70 simultaneously instructs the decoding device 50 and the
gain adjustment device 60 to change, the gain coefficient of the gain adjustment device 60 is
immediately changed, but the change of the DRC mode of the decoding device 50 is delayed. As
described above, since the decoding apparatus 50 and the gain adjusting apparatus 60 are not
synchronized, a sudden change in gain occurs in a short time, resulting in a problem that noise is
generated.
[0016]
FIG. 10 shows the input signal and output signal when changing the DRC mode from the
minimum DRC mode to the standard DRC mode, the DRC mode of the decoding device 50, the
gain coefficient set in the gain adjustment device 60, and the DRC mode to be realized. . The
input signal is a sine wave of -22 dB in Dolby Digital format. The minimum DRC mode is realized
by setting the decoding device 50 to the television DRC mode and setting the gain coefficient of
the gain adjustment device 60 to −11 dB.
[0017]
Time T11 shown in FIG. 10 indicates the timing when the control device 70 instructs the
decoding device 50 and the gain adjustment device 60 to simultaneously change the mode. Since
the decoding device 50 performs processing in frame units, at time T11, the DRC mode remains
unchanged in the television DRC mode, but the gain adjustment device 60 immediately changes
the gain coefficient from −11 dB to 0 dB.
[0018]
Time T12 indicates the timing when the decoding device 50 is actually changed to the standard
DRC mode. Between time T11 and time T12, the DRC mode to be realized is the minimum DRC
mode + 11 dB, which is an unintended mode. Therefore, as shown in the waveform of the output
signal, a sudden change in gain occurs in a short time, noise may occur, and a shock may occur.
In the past, mute was used to prevent shock noise.
09-05-2019
5
[0019]
The present invention has been made in view of the above problems in the prior art, and it is an
object of the present invention to provide a reproducing apparatus capable of suppressing noise
when changing the mode of the dynamic range control process for a sound signal. .
[0020]
In order to solve the above problems, the invention according to claim 1 performs decoding
processing on the digitally compressed sound signal, and performs dynamic range control
processing under any one of a plurality of dynamic range control modes. And a gain adjustment
unit for adjusting the gain of the sound signal subjected to the decoding processing and the
dynamic range control processing by the decoding unit, and the dynamic range control mode
change instruction inputted from the outside, Mode setting means for setting the dynamic range
control mode of the decoding means, and after the decoding means is changed to the set
dynamic range control mode, gain adjustment suitable for the changed dynamic range control
mode is performed And control means for controlling the Hare said gain adjusting means is a
reproducing device characterized by comprising a.
[0021]
The invention according to claim 2 is the reproduction apparatus according to claim 1, wherein
the control means controls the gain adjustment means to perform gain adjustment suitable for
the changed dynamic range control mode. It is characterized by gradually changing from the
original gain to the new gain.
[0022]
The invention according to claim 3 is the reproduction apparatus according to claim 1 or 2,
wherein the control means acquires the information indicating the current dynamic range control
mode from the decoding means, whereby the decoding means performs the reproduction. It is
characterized in that it is determined that the set dynamic range control mode has been changed.
[0023]
According to the present invention, it is possible to suppress noise when changing the mode of
the dynamic range control process for a sound signal.
[0024]
09-05-2019
6
FIG. 1 shows a functional configuration of the playback apparatus 100 according to the
embodiment of the present invention.
The playback device 100 is configured of a decoding device 10, a gain adjustment device 20, a
control device 30, and a D / A conversion unit 40.
[0025]
As shown in FIG. 1, the decoding device 10 includes a decoding processing unit 11, a register 12,
and an interface 13.
[0026]
The decoding processing unit 11 includes a decoder 111 for Dolby Digital, a decoder 112 for
DTS, a decoder 113 for PCM, a decoder 114 for AAC, and a selection switch 115, and selects a
decoder suitable for a stream of digital sound signals, Perform decryption processing.
When the digital sound signal is compressed by Dolby Digital, the decoder for Dolby Digital 111
performs any of the maximum DRC mode, standard DRC mode, minimum DRC mode, and
television DRC mode along with the decoding process. Perform DRC processing under one mode
(see Table 1).
[0027]
The register 12 is a memory device for temporarily storing data, and holds decoder information
121, DRC information 122, and the like.
The decoder information 121 refers to information (Dolby digital, DTS, PCM, AAC, etc.) indicating
the currently selected decoder.
Which decoder is to be selected is detected by means (not shown) for automatically detecting a
decoder suitable for the digital sound signal built in the decoding device 10.
09-05-2019
7
The DRC information 122 includes the operation mode (line mode or RF mode) set by the
controller 30, the scale factor (0.0 or 1.0) set by the controller 30, and the operation mode (line)
of the current decoder. Mode or RF mode).
[0028]
The interface 13 mediates the exchange of data with the control device 30.
[0029]
The gain adjustment device 20 includes a coefficient multiplier 21, a gain coefficient generation
unit 22, a gain coefficient table 23, a level control unit 24, and an interface 25.
[0030]
The coefficient multiplier 21 performs gain adjustment on the sound signal output from the
decoding device 10 for each channel.
The gain adjustment is performed based on the gain coefficient set by the level control unit 24.
[0031]
The gain coefficient generation unit 22 includes a CPU (Central Processing Unit) 221 and the
like.
The CPU 221 acquires the decoder information 121 and the DRC information 122 from the
decoding device 10, acquires the gain coefficient suitable for the decoder and the DRC mode
from the gain coefficient table 23, based on the decoder information 121 and the DRC
information 122, and performs the level control unit Set the gain factor to 24.
When the DRC mode change instruction is issued, the CPU 221 sets a new gain coefficient in the
level control unit 24 after the change to the DRC mode set by the control device 30 is completed
09-05-2019
8
in the decoding device 10.
[0032]
The gain coefficient table 23 is a table in which the decoder information 121 and the DRC
information 122 are associated with the gain coefficient, and is stored in the built-in memory of
the gain adjustment device 20. Table 2 shows the gain coefficient table 23.
[0033]
[0034]
As shown in Table 2, in the gain coefficient table 23, for PCM, DTS, and AAC, a gain coefficient is
set for each decoder.
In the case of Dolby Digital, a gain coefficient is set for each DRC mode (combination of an
operation mode and a scale coefficient). The gain coefficient “7FFFFF” corresponds to 0 dB,
and “241347” corresponds to −11 dB. Although the scale factor is not reflected in the Dolby
digital decoder when the operation mode is the RF mode (see Table 1), the gain adjustment
device 20 determines which mode the control device 30 sets the decoding device 10 to. In the
case of the minimum DRC mode, the scaling factor is set to 0.0, and in the case of the television
DRC mode, the scaling factor is set to 1.0.
[0035]
The level control unit 24 sets the gain coefficient set by the gain coefficient generation unit 22 in
the coefficient multiplier 21. When changing the value of the gain coefficient, the level control
unit 24 controls the gain coefficient set in the coefficient multiplier 21 to gradually change from
the original gain coefficient to the new gain coefficient. The gain coefficient generation unit 22
and the level control unit 24 implement control means described in the claims.
[0036]
09-05-2019
9
The interface 25 mediates the exchange of data with the decoding device 10.
[0037]
The control device 30 includes a control unit 31, a user interface 32 and an interface 33.
[0038]
The control unit 31 is a mode setting unit that sets the DRC mode in the decoding device 10
based on the DRC mode change instruction input through the user interface 32.
[0039]
The user interface 32 receives a DRC mode change instruction from the user and outputs the
instruction to the control unit 31.
[0040]
The interface 33 mediates the exchange of data with the decoding device 10.
[0041]
The D / A conversion unit 40 performs D / A conversion on the signal output from the gain
adjustment device 20.
[0042]
Next, the operation of the playback device 100 will be described.
FIG. 2 is a flowchart showing gain coefficient generation processing executed by the CPU 221 of
the gain coefficient generation unit 22.
[0043]
First, as shown in FIG. 2, the decoder information 121 and the DRC information 122 are acquired
from the decoding device 10 via the interface 25 (steps S1 and S2).
09-05-2019
10
Next, based on the decoder information 121 and the operation mode and scale factor set in the
decoding device 10 from the control device 30 among the DRC information 122, gain coefficients
suitable for the decoder and DRC mode are obtained from the gain coefficient table 23 (Step S3).
[0044]
Here, it is determined whether or not the input signal is a Dolby Digital system and an instruction
to change the DRC mode is given (step S4).
Whether or not the input signal is Dolby Digital is determined based on the decoder information
121 acquired from the decoding device 10.
In addition, whether or not a change in DRC mode is instructed is determined by comparing the
DRC information 122 acquired from the decoding device 10 with the previously acquired DRC
information held in the gain adjustment device 20. Ru.
[0045]
If the input signal is a Dolby Digital system and change of the DRC mode is instructed (Step S4;
YES), the process waits until the change of the DRC mode is completed (Step S5).
Specifically, information indicating the current operation mode of the decoder among the DRC
information 122 is acquired from the decoding device 10 at regular intervals, and the operation
mode set in the decoding device 10 from the control device 30 acquired in step S2 When the
same mode is entered, it is determined that the DRC mode change has been completed.
[0046]
When the change of the DRC mode is completed (step S5; YES), or when the input signal is not
Dolby Digital, or when the input signal is Dolby Digital and the change of DRC mode is not
instructed (Step S4; NO), the gain coefficient acquired in step S3 is set in the level control unit 24
(step S6).
09-05-2019
11
[0047]
Here, the CPU 221 sets a subtraction instruction to change the gain coefficient from 0 dB to −11
dB, and sets an addition instruction to the level control unit 24 to change the gain coefficient
from −11 dB to 0 dB.
For example, a subtraction instruction is set when transitioning from the standard DRC mode to
the minimum DRC mode, and an addition instruction is set when transitioning from the minimum
DRC mode to the standard DRC mode.
[0048]
Next, the level adjustment processing performed by the level control unit 24 will be described
with reference to FIG.
The level adjustment process is a process performed for each sample of the sound signal output
from the decoding device 10.
[0049]
Here, the gain coefficient held by the level control unit 24 is the current gain coefficient, the gain
coefficient set from the gain coefficient generation unit 22 to the level control unit 24 is the
target gain coefficient, and the gain coefficient set to the coefficient multiplier 21 is It is simply a
gain factor. Further, the difference when gradually changing from the current gain coefficient to
the target gain coefficient in a predetermined fixed period is set as the amount of change.
[0050]
As shown in FIG. 3, first, the gain coefficient set in the coefficient multiplier 21 one sample
before is set as the current gain coefficient (step S11). Next, it is determined whether the
09-05-2019
12
subtraction instruction or the addition instruction is set from the gain coefficient generation unit
22 (step S12).
[0051]
If a subtraction instruction is set from the gain coefficient generation unit 22 (step S12; YES), the
result of subtracting the change amount from the current gain coefficient is substituted for the
current gain coefficient (step S13). Here, the current gain coefficient and the target gain
coefficient set by the gain coefficient generation unit 22 are compared (step S14), and if the
current gain coefficient is smaller than the target gain coefficient (step S14; YES), the target gain
The coefficient is substituted for the gain coefficient (step S15). That is, the gain factor is not
smaller than the target gain factor (e.g., -11 dB). In step S14, if the current gain coefficient is
equal to or greater than the target gain coefficient (step S14; NO), the current gain coefficient is
substituted for the gain coefficient (step S16).
[0052]
On the other hand, when the addition instruction is set from the gain coefficient generation unit
22 (step S12; NO), the result of adding the change amount to the current gain coefficient is
substituted for the current gain coefficient (step S17). Here, the current gain coefficient is
compared with the target gain coefficient set by the gain coefficient generation unit 22 (step
S18), and if the current gain coefficient is larger than the target gain coefficient (step S18; YES),
the target gain The coefficient is substituted for the gain coefficient (step S19). That is, the gain
factor is not made larger than the target gain factor (for example, 0 dB). In step S18, when the
current gain coefficient is less than or equal to the target gain coefficient (step S18; NO), the
current gain coefficient is substituted for the gain coefficient (step S20).
[0053]
After step S15, step S16, step S19, and step S20, a gain coefficient is set in the coefficient
multiplier 21 (step S21).
[0054]
When the gain coefficient is not controlled to be changed gradually when changing the gain
coefficient, the gain coefficient set from the gain coefficient generation unit 22 may be set in the
coefficient multiplier 21 as it is.
09-05-2019
13
[0055]
FIG. 4 shows an input signal and an output signal when changing the DRC mode from the
minimum DRC mode to the standard DRC mode, the DRC mode of the decoding device 10, the
gain coefficient set in the gain adjustment device 20, and the DRC mode to be realized. .
The input signal is a sine wave of -22 dB in Dolby Digital format.
[0056]
Time T1 shown in FIG. 4 indicates timing when the control device 30 instructs the decoding
device 10 to change the mode.
Since the decoding device 10 performs processing in units of frames, the DRC mode remains
unchanged at the television DRC mode at time T1.
[0057]
The time T2 indicates the timing when the decoding device 10 is actually changed to the DRC
mode instructed by the control device 30. At this timing, the gain adjustment device 20
determines that the DRC mode change has been completed based on the DRC information 122
(information indicating the current operation mode of the decoder) acquired from the decoding
device 10, and starts changing the gain coefficient.
[0058]
Between time T2 and time T3, the gain adjustment device 20 is in the process of gradually
changing the gain coefficient from −11 dB to 0 dB.
[0059]
09-05-2019
14
Time T3 indicates the timing at which the gain adjustment device 20 completes the change of the
gain coefficient.
After this, it is in the DRC mode instructed to change.
[0060]
After the change to the DRC mode instructed from the control device 30 is completed in the
decoding device 10, the gain coefficient is changed in the gain adjustment device 20, and
therefore, as shown in the waveform of the output signal in FIG. Gain fluctuation does not occur.
Although there is a period in which the gain is small for a certain fixed period (immediately after
time T2), this is a portion which is not bothersome to hear.
[0061]
As described above, according to the reproducing apparatus 100, since the decoding apparatus
10 and the gain adjustment apparatus 20 are synchronized, noise generated when changing the
DRC mode when the input signal is Dolby Digital is suppressed. Can. In addition, since it is not
necessary to mute when changing the DRC mode, the response speed of the system can be
increased.
[0062]
Also, conventionally, when the input signal changes from Dolby Digital to PCM, or from PCM to
Dolby Digital, etc., there is a possibility that noise will occur when DRC is enabled or disabled.
The synchronization can suppress this noise.
[0063]
The playback device 100 may be realized by a DSP (Digital Signal Processor).
[0064]
09-05-2019
15
Modified Example Next, the reproducing apparatus 200 will be described as a modified example
to which the present invention is applied.
In the reproducing apparatus 200 shown in FIG. 5, the same components as those of the
reproducing apparatus 100 described in the above embodiment are given the same reference
numerals, and the description thereof will be omitted.
Hereinafter, the configuration and processing that are characteristic of the playback device 200
will be described.
[0065]
In the playback device 200, the control device 30 is configured to include the gain coefficient
generation unit 34 and the gain coefficient table 35.
[0066]
The control unit 31 sets the DRC mode in the decoding device 10 based on the DRC mode change
instruction input through the user interface 32.
In addition, the control unit 31 sets the gain coefficient acquired by the gain coefficient
generation unit 34 from the gain coefficient table 35 in the level control unit 24 of the gain
adjustment device 20.
[0067]
The user interface 32 receives a DRC mode change instruction from the user and outputs the
instruction to the control unit 31.
[0068]
The interface 33 mediates the exchange of data with the decoding device 10 and the gain
adjustment device 20.
[0069]
09-05-2019
16
The gain coefficient generation unit 34 acquires a gain coefficient from the gain coefficient table
35 based on the decoder information 121 and the DRC information 122 acquired from the
decoding device 10, and outputs the gain coefficient to the control unit 31.
[0070]
The gain coefficient table 35 is a table in which the decoder information 121 and the DRC
information 122 are associated with the gain coefficient.
The contents of the gain coefficient table 35 are the same as those of the gain coefficient table
23 shown in Table 2, and thus the description thereof is omitted.
[0071]
The level control unit 24 sets the gain coefficient set by the control unit 31 in the coefficient
multiplier 21.
When changing the value of the gain coefficient, the level control unit 24 controls the gain
coefficient set in the coefficient multiplier 21 to gradually change from the original gain
coefficient to the new gain coefficient.
[0072]
In the reproduction device 200, the control device 30 includes the gain coefficient generation
unit 34 and the gain coefficient table 35. Therefore, the configuration of the gain adjustment
device 20 is simplified as compared with the reproduction device 100, and the load of the gain
adjustment device 20. Is reduced.
[0073]
Further, if the level control unit 24 is also included in the control device 30, the present
invention can be realized without changing the conventional gain adjustment device.
[0074]
09-05-2019
17
The description in the above embodiment is an example of the reproducing apparatus according
to the present invention, and the present invention is not limited to this.
The detailed configuration and the detailed operation of each device constituting the playback
device can be appropriately changed without departing from the spirit of the present invention.
[0075]
It is a block diagram which shows the functional structure of the reproducing | regenerating
apparatus 100 in embodiment of this invention.
5 is a flowchart showing gain coefficient generation processing executed by the CPU 221 of the
gain coefficient generation unit 22.
5 is a flowchart showing level adjustment processing executed by the level control unit 24; FIG. 7
is a diagram showing an input signal and an output signal, a DRC mode of the decoding device
10, a gain coefficient set in the gain adjustment device 20, and a DRC mode to be implemented
when changing the DRC mode from the minimum DRC mode to the standard DRC mode. It is a
block diagram which shows the reproducing apparatus 200 functional structure in a
modification. It is a graph which shows the compression characteristic of standard DRC mode. It
is a graph which shows the compression characteristic of the minimum DRC mode. It is a graph
which shows the compression characteristic of television type DRC mode. FIG. 16 is a block
diagram showing a functional configuration of a conventional reproduction device 300. FIG. 17 is
a diagram showing an input signal and an output signal, a DRC mode of the decoding device 50,
a gain coefficient set in the gain adjustment device 60, and a DRC mode to be realized when
changing the DRC mode from the minimum DRC mode to the standard DRC mode.
Explanation of sign
[0076]
DESCRIPTION OF SYMBOLS 10 Decoding apparatus 11 Decoding processing part 111 Decoder
for Dolby Digital 112 Decoder for DTS 113 Decoder for PCM 114 Decoder for AAC 115 Selection
09-05-2019
18
switch 12 Register 121 Decoder information 122 DRC information 13 Interface 20 Gain
adjustment device 21 Coefficient multiplier 22 Gain coefficient generation unit 221 CPU 23 gain
coefficient table 24 level control unit 25 interface 30 control device 31 control unit 32 user
interface 33 interface 34 gain coefficient generation unit 35 gain coefficient table 40 D / A
conversion unit 50 decoding device 51 decoding processing unit 511 Dolby Digital decoder 512
DTS decoder 513 PCM decoder 514 AAC decoder 515 Pitch 52 register 521 decoder
information 522 DRC information 53 interface 60 gain adjusting device 61 the coefficient
multiplier 62 interface 70 controller 71 control unit 72 the user interface 73 interface 80 D / A
converter unit 100 reproducing apparatus 200 reproducing apparatus 300 reproducing
apparatus
09-05-2019
19
Документ
Категория
Без категории
Просмотров
0
Размер файла
28 Кб
Теги
jp2007109328
1/--страниц
Пожаловаться на содержимое документа