JP2001257597A - Data reception device and data transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data reception device and a transmission device, which reduce the deterioration of data due to the repetition of compression/non- compression conversion. SOLUTION: A data reception device 105 that a repeating station 104 has converts inputted compression data of an MPEG system into compression data of a DVCPRO system, separates an MPEG compression parameter, maps compression data of the DVCPRO system and the MPEG compression parameter on the data block of an SDTI signal and outputs it. A switch 207 changes over plural input terminals at any time which are not illustrated and outputs the inputted SDTI signal to a data transmission device 112. The data transmission device 112 uses the MPEG compression parameter that the data reception device 105 multiplexes at the time of de-mapping the outputted SDTI signal and converting compression data of the DVCPRO system into compression data of the MPEG system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a data receiving apparatus and a data transmitting apparatus, and more particularly, to a data receiving apparatus and a data transmitting apparatus for reducing data deterioration.

[0002]

2. Description of the Related Art In recent years, digitization of broadcast data has been rapidly progressing with the spread of cable television, BS (broadcast satellite) broadcast, and CS (communication satellite) broadcast. One of the advantages of the digital method is that video and audio data can be efficiently compressed. A data transmission side such as a broadcasting station can provide a wide variety of services to viewers by compressing the data, such as transmitting high-quality video and audio data over multiple channels. Data compression methods are MPEG, DVC,
PRO and the like have been proposed. Also, the compression ratio and data format are different for each compression method, and there is no compatibility. Therefore, the transmission standards for compressed data that are compliant between the data transmission side (for example, a key broadcasting station) and the reception side (for example, a general household) are unified. However, a relay station exists between a key broadcasting station and a general home, and the relay station and the key broadcasting station often use different compressed data transmission standards. In this case, as described above, the data compression method differs between the key broadcasting station and the relay station. For example, data transmitted from a key broadcasting station is MPE
This is a case where data that is compressed by the G method and that is compressed by the DVCPRO method in the relay station is edited / processed.

In the above case, even if data is output from a key broadcasting station, the data cannot be directly edited / processed at a relay station. Therefore, the relay station determines that the input M
The data compressed by the PEG method is converted to data compressed by the DVCPRO method, and after processing such as editing / processing is performed, the data is converted to data compressed by the MPEG method and output.

[0004] The relay station is provided with a data receiving device and a data transmitting device in order to perform the above-described conversion of the compression system. The data receiving device temporarily converts data compressed by the compression method of the key broadcasting station into uncompressed data, and compresses and outputs the uncompressed data by the method of the relay station. Thereafter, the compressed data is output to the data transmission device as it is or after being subjected to predetermined processing. The data transmitting device converts the compressed data output from the data processing device into uncompressed data, compresses the uncompressed data again by the method of the key broadcasting station, and outputs the compressed data to ordinary households. Hereinafter, the conventional broadcasting system as described above will be described.

FIG. 9 is a diagram showing an example of a conventional broadcasting system. The broadcasting system 200 includes a key station 201, transmission paths 203 and 216, a relay station 204, and a terminal station 2
17 are provided. The key station 201 includes an MPEG encoder 202. Relay station 204 includes a data receiving device 205, transmission lines 206 and 208, a switch 207, and a data transmitting device 209. The terminal station 217 includes an MPEG decoder 218 and a monitor 219.
And Here, to give a specific example for easy understanding, the key station 201 is a key station for transmitting data such as a television broadcast, and the relay station 204 receives the data transmitted from the key station and receives the data. A local station and a terminal station 217 that perform predetermined processing on a television receiver of a general household, a transmission path 203, and a transmission path 2
06 and 208 and the transmission path 216 are optical fiber cables for broadcasting.

[0006] The MPEG encoder 202 converts the data into M
The data is compressed by the PEG method and output to the transmission path 203. MPE
Data compressed by the G method (hereinafter, referred to as MPEG data) is input to the data receiving device 205. Relay station 2
04, DVCP specified in SMPTE314M
Data (hereinafter, referred to as DVCPRO data) compressed by an RO (commercial digital VTR compression method) method is used. The data receiving device 205 receives the input M
After converting PEG data to DVCPRO data, SM
The DVCPRO data is mapped on the data block of the SDTI signal conforming to PTE 305 and the transmission path 2
06 is output. The SDTI signal is input to the switch 207. The switch 207 has a plurality of input terminals (not shown), and predetermined data is input to each of the input terminals. The switch 207 changes output data by switching input terminals as needed. For example, when data stored in advance by a data storage device (not shown) is output to the switch 207, the switch 207 receives data from the data storage device from a terminal to which real-time data output from the data reception device 205 is input. The terminal is switched to a terminal to be output to the transmission line 208. The SDTI signal output from the switch 207 is input to the data transmission device 209 via the transmission line 208. The data transmitting device 209 demaps the SDTI signal and performs DVC
After converting the PRO data into uncompressed data, the data is compressed by the MPEG method and output to the transmission path 216. Note that the data input to the switch 207 is not limited to the above-described data of the storage system, and real-time data or the like subjected to predetermined processing may be input.

FIG. 10 is a block diagram showing an example of a conventional data receiving device. The data receiving device 205
EG decoder 210 and DVCPRO encoder 211
And an SDTI encoder 212. First,
The MPEG data output from the key station 201 shown in FIG. 9 is input to the MPEG decoder 210 via the transmission path 203. The MPEG decoder 210 converts the MPEG data into uncompressed data and outputs it. Next, the uncompressed data is input to the DVCPRO encoder 211. The DVCPRO encoder 211 compresses and outputs uncompressed data by the DVCPRO method. Next, DVC
The PRO data is stored in the SDTI encoder 212 at the SDTI
The signal is mapped onto a data block of the signal and output to the transmission path 206 as an SDTI signal.

FIG. 11 is a block diagram showing an example of a conventional data transmission device. The data transmission device 209 is an SD
TI decoder 213 and DVCPRO decoder 214
And an MPEG encoder 215. SDT
The I decoder 213 demaps the input SDTI signal to extract DVCPRO data,
Output to the decoder 214. DVCPRO decoder 21
Reference numeral 4 converts the input DVCPRO data into uncompressed data and outputs the data. The uncompressed data is input to the MPEG encoder 215, compressed by the MPEG method, and output to the transmission path 216. The terminal station 217 includes an MPEG decoder 218 and a monitor 219. MPEG
The data is transmitted via the transmission path 216 to the MPEG decoder 21.
8 is input. The MPEG decoder 218 converts the input MPEG data into uncompressed data, and
19 is output. The monitor 219 reproduces the input uncompressed data.

[0009]

As described above, in the conventional relay station, the data receiving device 205 converts the MPEG data into DVCPRO data and outputs it, and the data transmitting device 209 converts the DVCPRO data into MPEG data. It was converted and output. As apparent from FIGS. 10 and 11, the data receiving device 205 and the data transmitting device 209 do not have a configuration for transmitting and receiving the compression parameter added to the MPEG data output from the key station 201. Was. Therefore, the data transmitting apparatus 209 cannot use the MPEG compression parameter added to the data at the key station 201 when compressing the data by the MPEG method. As a result, the conventional relay station has a problem that the so-called rounding error accumulates in the data and the data quality deteriorates.

Therefore, an object of the present invention is to provide a data receiving apparatus and a data transmitting apparatus which reduce deterioration of data quality due to repeated compression / non-compression conversion.

[0011]

Means for Solving the Problems and Effects of the Invention A first invention is a data receiving apparatus for converting a compression system of received compressed data, wherein the received first compressed data is converted into non-compressed data. A data converter for converting and outputting the compressed data and separating and outputting a compression parameter of the first compression method from the compressed data; and compressing and outputting uncompressed data output from the data converter with the second compression method. A data compression unit, a parameter multiplexing unit that multiplexes the compression parameter of the first compression method output from the data conversion unit to the second compressed data output from the data compression unit, and outputs the multiplexed data. Second compressed data and the first compressed data
And a mapping unit that maps the compression parameters of the compression method on a data block of a predetermined signal and outputs the data.

As described above, according to the first aspect, the first compressed data input to the data receiving device is converted into the second compressed data, and the compression parameter of the first compression method is set to the second compression data. Can be multiplexed and output.

A second invention is an invention according to the first invention, wherein the parameter multiplexing unit converts the compression parameter of the first compression system output from the data conversion unit into serial data and outputs the serial data. A first data output unit, a second data output unit that outputs the second compressed data output from the data compression unit as it is, and a first data output unit that refers to the second compressed data output from the data compression unit. And a pulse generator for generating a pulse for synchronizing the output timing of the data output unit with the output timing of the second data output unit.

As described above, according to the second aspect, the first aspect
Output timing of the compression parameter of the compression method of
And the output timing of the compressed data.

A third invention is a invention according to the second invention, wherein the parameter multiplexing unit has an MSB of a data block of data compressed by the second system having an 8-bit width.
It is characterized in that a compression parameter of the first compression method is added to the side or the LSB side.

As described above, according to the third aspect, the first aspect
Can be added to the MSB side or LSB side of the data block of the second compressed data.

A fourth invention is an invention according to any one of the first to third inventions, wherein the mapping unit comprises an SMPTE
The first to eighth bits on the data block of the SDTI signal specified by 305M are data compressed by the second method, and the ninth bit is a compression parameter of the first compression method. .

As described above, according to the fourth aspect, SD
The compression parameter of the first compression scheme can be arranged in the ninth bit of the TI signal.

A fifth invention is an invention according to any one of the first to fourth inventions, wherein the first compressed data is data compressed by the MPEG system, and the second compressed data is DV data.
It is characterized by being data compressed by the CPRO method.

As described above, according to the fifth aspect, the data receiving apparatus converts the data compressed by the MPEG system into a D
The data can be converted into data compressed by the VCPRO method.

According to a sixth aspect of the present invention, there is provided a data transmitting apparatus for converting a compression system of compressed data mapped on a data block of a predetermined signal and outputting the converted data, wherein the data on the data block of the input signal is demapped. A demapping unit that outputs second compressed data in which the compression parameters of the first compression scheme are multiplexed; and a first compression scheme that is multiplexed in the second compressed data output from the demapping unit. A parameter separation unit that separates a compression parameter and outputs the second compressed data as it is, a data conversion unit that converts the second compressed data output from the parameter separation unit into uncompressed data and outputs the data, Compressing the uncompressed data output from the first compression system using the compression parameter of the first compression system output from the parameter separation unit. And a data compression unit for outputting.

As described above, according to the sixth aspect, the data format before the mapping of the second compressed data mapped on the data block of the predetermined signal and the compression parameter of the first compression method is performed. , The data conversion unit can convert the second compressed data into uncompressed data, and the data compression unit can convert the uncompressed data into the first compressed data using the compression parameter.

A seventh invention is the invention according to the sixth invention, wherein the parameter separation unit performs compression of the first compression system multiplexed on the second compressed data output from the demapping unit. A first data output unit that converts the parameters into 8-bit width parallel data and outputs the converted data; a second data output unit that outputs the second compressed data output from the demapping unit as it is; A pulse generating unit that generates a pulse for synchronizing the output timing of the first data output unit and the output timing of the second data output unit with reference to the output second compressed data.

As described above, according to the seventh aspect, the first aspect
Output timing of the compression parameter of the compression method of
And the output timing of the compressed data.

An eighth invention is an invention according to the sixth or seventh invention, wherein the demapping unit is an SMPTE30.
The data on the data block of the SDTI signal specified by 5M is demapped and the second
Of compressed data and the data block of the data
A compression parameter of the first compression method added to the B side or the LSB side is output.

As described above, according to the eighth aspect, the SD
The data mapped on the data block of the TI signal can be restored in the data format before the data is mapped.

A ninth invention is an invention according to any one of the sixth to eighth inventions, wherein the first compressed data is MPEG data.
The second compressed data is data compressed by the D method.
It is characterized by being data compressed by the VCPRO method.

As described above, according to the ninth aspect, the data transmitting apparatus can convert data compressed by the DVCPRO system into data compressed by the MPEG system.

According to a tenth aspect, there is provided a data receiving method for converting a compression system of received compressed data and outputting the converted data.
Converting the received first compressed data into non-compressed data and outputting the data, and separating and outputting the compression parameter of the first compression method; and compressing and outputting the non-compressed data by the second compression method. Multiplexing the compression parameter of the first compression method with the output second compressed data, and outputting the second compression data and the compression parameter of the first compression method to a data block of a predetermined signal. Mapping on the top and outputting.

As described above, according to the tenth aspect, the first compressed data is converted into the second compressed data,
The compression parameter of the first compression scheme can be multiplexed with the second compressed data and output.

An eleventh invention is a data transmission method for converting a compression scheme of compressed data mapped on a data block of a predetermined signal and outputting the converted data, wherein the signal mapped on the predetermined data block is de-mapped. First
Outputting the second compressed data in which the compression parameters of the first compression method are multiplexed; outputting the compression parameters of the first compression method multiplexed in the second compressed data; Outputting the data compressed by the method as it is, converting the second compressed data into uncompressed data, and outputting the uncompressed data.
Using the compression parameters of the first compression scheme to compress and output using the first compression scheme.

As described above, according to the eleventh aspect, the second signal mapped on the data block of the predetermined signal is provided.
Of the compressed data and the compression parameter of the first compression method are restored in the data format before being mapped, and then the second compressed data is converted into the first compressed data by using the compression parameter of the first compression method. Can be converted.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is different from the key station in the data transmission standard to which the relay station conforms. Therefore, the compressed data output from the key station is converted into the compressed data according to the data transmission standard in the relay station. When necessary, it is possible to reduce deterioration of image data and the like due to repeated compression / non-compression conversion of data. Hereinafter, this will be described in detail.

FIG. 1 is a block diagram showing a configuration of the relay station 104 of the present invention. The broadcasting system according to the present invention is different from the conventional broadcasting system 200 in the data receiving device and the data transmitting device included in the relay station. Therefore, the same components as those of the conventional broadcasting system have the same reference numerals, and detailed description thereof will be omitted. The data compression scheme handled by the broadcast system of the present invention is the same as that of the conventional broadcast system 200, and a detailed description thereof will be omitted.

The relay station 104 includes a data receiving device 105
, A switch 207, and a data transmission device 112. The operation of relay station 104 will be described with reference to FIGS. The key station 201 transmits data compressed by the MPEG method (hereinafter, referred to as MPEG data). The data receiving device 105 separates a compression parameter from the received data compressed by the MPEG method,
Data compressed by the CPRO method (hereinafter DVCPRO)
Data) and convert the compressed data to MP
The compression parameters of the EG method are multiplexed and output to the transmission path 206. The switch 207 has a plurality of input terminals (not shown), and predetermined data is input to each of the input terminals.
The switch 207 changes data to be output to the transmission line 208 by switching input terminals as needed. However, one of the plurality of input terminals includes the data receiving device 1
05 is input via the transmission path 206. The data transmission device 112 converts the DVCPRO data input via the transmission path 208 into MPEG data and outputs the data. At this time, the data transmission device 112
MP multiplexed with data compressed by the DVCPRO method
Use EG compression parameters. Hereinafter, operations of the data receiving device 105 and the data transmitting device 112 will be described in detail.

FIG. 2 is a block diagram showing details of the data receiving apparatus according to the embodiment of the present invention. The data receiving apparatus 105 includes: an MPEG decoder 106; a DVCPRO encoder 211; a parameter multiplexing unit 107;
And an I encoder 212. Referring to FIG. 9 again, the MPEG data output from the MPEG encoder 202 provided in the key station 201 is input to the MPEG decoder 106 via the transmission path 203. The MPEG decoder 106 converts the MPEG data into uncompressed data and outputs it to the DVCPRO encoder 211,
A parameter used when compressing data by the PEG method (hereinafter, referred to as an MPEG compression parameter) is separated and output to the parameter multiplexing unit 107. The MPEG compression parameter is a general term for a quantization matrix extension, a motion vector, a picture header, and the like added to MPEG data. The DVCPRO encoder 211 compresses the input uncompressed data by the DVCPRO method and outputs the compressed data to the parameter multiplexing unit 107. Parameter multiplexing unit 10
7 is the MPEG input from the MPEG decoder 106
Set the compression parameter to M of the data block of the compressed data.
It is multiplexed on the SB side and output to the SDTI encoder 212. The SDTI encoder 212 maps the compressed data in which the MPEG compression parameters are multiplexed onto the data block of the SDTI signal, and outputs the data to the switch 207 via the transmission path 206. The operation of the switch 207 is as described above. Here, the data transmission between the hardware provided in the relay station 104 is all performed by the SMPTE 305.
An SDTI signal conforming to the standard is used.

FIG. 3 is a block diagram showing details of parameter multiplexing section 107 included in data receiving apparatus 105.
The parameter multiplexing unit 107 includes a timing pulse generator 108, a parallel / serial conversion unit 109, and shift registers 110 and 111. The parallel / serial conversion unit 109 is provided for the MPEG decoder 10
6 output the MPEG compression parameters output in parallel /
Serial conversion is performed and output to the shift register 111. The shift register 110 includes a DVCPRO encoder 211
And outputs the DVCPRO data output as it is. The shift register 111 outputs the MPEG compression parameter output from the parallel / serial conversion unit 109. The timing pulse generator 108 refers to the input DVCPRO data and refers to the shift register 1
A pulse for synchronizing the output timing of the shift register 110 with the output timing of the shift register 110 is generated and output to the shift registers 107 and 111. The shift registers 110 and 111 output data at timings specified by the pulses output from the timing pulse generator 108, respectively. As a result, the parameter multiplexing unit 107 outputs 9-bit width data in which the MPEG compression parameters are multiplexed on the MSB side of the 8-bit width DVCPRO data.

FIG. 4 is a block diagram showing details of the data transmitting apparatus according to the embodiment of the present invention. The data transmission device 112 includes an SDTI decoder 213, a parameter separation unit 113, a DVCPRO decoder 214,
And a G encoder 118. Referring to FIG. 9 again, SDTI decoder 213 demaps the SDTI signal input from switch 207 via transmission path 208 and outputs the result to parameter separation section 113. That is, the SDTI decoder 213 outputs the DVCPRO data to which the MPEG compression parameter is added to the parameter separation unit 113. The parameter separation unit 113
DVCPRO with G compression parameter added to MSB side
MPEG compression parameters separated from data
In addition to outputting to the encoder 118, the DVCPRO data is output to the DVCPRO decoder 214 as it is.
In the present embodiment, the MPEG compression parameter is DV
It is added to the MSB side of the CPRO data block, but is not limited to this, and may be added to the LSB side. The DVCPRO decoder 214 converts the DVCPRO data into uncompressed data and converts the data into uncompressed data.
8 is output. The MPEG encoder 118 compresses the uncompressed data by the MPEG method using the MPEG compression parameters separated by the parameter separation unit 113, and
6 is output.

FIG. 5 is a diagram showing details of the parameter separating section 113 included in the data transmitting apparatus 112. The parameter separation unit 113 includes the timing pulse generator 11
4, shift registers 115 and 116, and a serial / parallel converter 117. The shift register 116 receives the D signal output from the SDTI decoder 213.
The VCPRO data is output as it is. The shift register 115 outputs MPEG compression parameters multiplexed on the MSB side of the DVCPRO data. The serial / parallel converter 117 converts the MPEG compression parameters output from the shift register 115 into 8-bit width parallel data and outputs the data. The timing pulse generator 114 refers to the input DVCPRO data, generates a pulse for synchronizing the output timing of the shift register 115 and the output timing of the shift register 116, and outputs the pulse to the shift registers 115 and 116. The shift registers 115 and 116 output data at timings defined by the pulses output from the timing pulse generator 114, respectively. As a result, the parameter separating unit 113 outputs 8-bit width DVCPRO data and MPEG compression parameters.

As described above, since the timing pulse generators 108 and 114 synchronize the multiplexing timing and demultiplexing timing of the MPEG compression parameter with the bit stream of the DVCPRO data, the parameter multiplexing unit 107 sets the ninth bit of the DVCPRO data. MPEG multiplexed on MSB side or LSB side as
The compression parameter can be separated by the parameter separation unit 113 without shifting. Note that when the MPEG compression parameter shifts, deterioration in image quality and the like described later occurs.

FIGS. 6 and 7 show D and D in this embodiment.
FIG. 3 is a diagram illustrating details of fixed-length and variable-length data blocks of an SDTI signal to which VCPRO data is mapped. With reference to FIG. 6 and FIG. 7, the position where the DVCPRO data and the MPEG compression parameter are mapped will be briefly described. Note that the SDTI signal is SMP
It conforms to TE305M. Note that SMPTE 305
M is defined as a data block having an 8-bit and 9-bit width. In the present embodiment, it is assumed that the data block has a data width of 9-bit.

Data block 3 shown in FIGS. 6 and 7
01 and 401 (first bit b0 to eighth bit b7
), DVCPRO data is mapped.
However, since the DVCPRO data is not mapped to the ninth bit b8 (the areas 302 and 402 in FIGS. 6 and 7), the parameter multiplexing unit 107 multiplexes the ninth bit b8 with the MPEG compression parameter.
Note that, although different from the present embodiment, the ninth bit b8 has MP
It is also possible to map and transmit EG data, and there are standards for that.

As described above, according to the present invention, when the DVCPRO data is mapped onto the data block of the SDTI signal, the ninth bit b8 of the SDTI signal which is not used
The PEG compression parameter is multiplexed and output to the subsequent stage. When the data is compressed again by the MPEG system at the subsequent stage, the MP
The EG compression parameter is used. At this time, as described above, since the multiplexing timing of the parameter multiplexing unit 107 and the separation timing of the parameter separating unit 113 are synchronized with the bit stream of the DVCPRO data, the MPEG compression parameters multiplexed on the DVCPRO data are shifted. Is separated as it is. Therefore, the MPEG encoder 118 controls the key station 20
1 converts the uncompressed data to MPEG data using the MPEG compression parameters used to generate the MPEG data.
Can be compressed in a manner. As a result, the relay station 104
Can reduce the deterioration of data because the rounding error accumulated in the data is small even if the compression / non-compression conversion of the input data is repeated. Hereinafter, as in the present invention, MPEG
An example of a specific effect obtained by transmitting the compression parameter to the subsequent stage without shifting will be described.

FIG. 8 is a graph showing an example in which the degree of data deterioration differs between when a predetermined compression parameter is stored and when it is changed. Here, the data indicated by the first three bits of the GOP (group of picture), which is one of the compression parameters, that is, the case where the picture type is stored and the case where the data is changed by being phase-shifted by one frame And compared.
The structure of the GOP used is N = 12 and M = 3. Here, N indicates the number of pictures in the GOP,
M indicates a cycle in which an I picture or a P picture appears. FIG. 8 shows Mobile & Calendar, B
The first 13 frames of each of three reference test sequences (hereinafter referred to as test sequences) referred to as askball and Horseriding are each represented by an MP.
場合 When ML MPEG-2 3.23 Mbps cascade compression operation is repeated for 8 generations or more
announcements of cascaded co
ding) (luminance signal value to noise value ratio with respect to the first generation).
NR relative to first gene
This is described as “PSNR” hereinafter. ) Is compared in the above two cases. (Source: SNELL & WILCOX Inc. Internet homepage http://www.Snell.co.uk)
/ Internet / d body. “T” in html
he MOLE ^™ files No. 009 ”FIG.
1-Effect of Simple Cascad
e Coding).

In FIG. 8, if the picture type included in the GOP is stored in each compression generation, the PS
The NR deteriorates by about 0.5 dB in the second generation compression, and when the compression is performed up to the fifth generation, the deterioration becomes about 1 dB in all test sequences. On the other hand, GO
If P is changed in each compression generation (here, a phase shift of one frame), the PSNR is degraded by 2 dB or more in the second generation compression except for one test sequence, and cumulatively thereafter. to degrade. In this case, the degradation of the PSNR continues even after the eighth generation (not shown).

When the above is applied to the embodiment of the present invention, the following is obtained. First, at the key station 201, the first
The second MPEG compression is performed. The data receiving apparatus 105 outputs the MPEG compression parameter used at this time without shifting (changing) the data to the data transmitting apparatus 112. The data transmission device 112 receives the input MP
A second MPEG compression is performed based on the EG compression parameter. An example of the effect of this is as shown in FIG.

In this embodiment, MPEG and D
Although the case where the conversion of the compression method is performed between the VCPROs has been described, the present invention is not limited to this combination.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a relay station according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a data receiving device according to an embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a parameter multiplexing unit included in the data receiving apparatus according to the embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a data transmission device according to an embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a parameter separating unit included in the data transmitting apparatus according to the embodiment of the present invention.

FIG. 6 is a diagram illustrating an aspect of a fixed-length data block of an SDTI signal.

FIG. 7 is a diagram illustrating an aspect of a variable-length data block of an SDTI signal.

FIG. 8 is a graph comparing data deterioration when a picture type is stored and when the picture type is changed.

FIG. 9 is a block diagram showing a conventional broadcasting system.

FIG. 10 is a block diagram showing a conventional data receiving device.

FIG. 11 is a block diagram showing a conventional data transmission device.

[Explanation of symbols]

 105 data receiving device 106 MPEG decoder 107 parameter multiplexing unit 112 data transmitting device 113 parameter separating unit 118 MPEG encoder 211 DVCPRO encoder 212 SDTI encoder 213 SDTI decoder 214 DVCPRO decoder

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C059 KK01 KK41 MA00 RA01 RE09 SS01 UA02 UA05 5J064 AA01 BB13 BD03 5K041 AA04 CC02 DD02 FF01 FF38 HH22 HH39

Claims (11)

[Claims] 1. A data receiving apparatus for converting a compression method of received compressed data, comprising: converting received first compressed data into uncompressed data and outputting the data; A data conversion unit that separates and outputs a compression parameter of a method, a data compression unit that compresses and outputs uncompressed data output from the data conversion unit by a second compression method, and a data output from the data conversion unit. A parameter multiplexing unit that multiplexes the compression parameter of the first compression method with the second compressed data output from the data compression unit, and outputs the second compressed data output from the parameter multiplexing unit; And a mapping unit for mapping the compression parameter of the compression method on a data block of a predetermined signal and outputting the data. 2. A parameter multiplexing unit comprising: a first data output unit configured to convert a compression parameter of a first compression scheme output from the data conversion unit into serial data and output the serial data; A second data output unit that outputs the compressed second compressed data as it is, an output timing of the first data output unit with reference to the second compressed data output from the data compression unit, 2. The data receiving device according to claim 1, further comprising: a pulse generating unit that generates a pulse for synchronizing an output timing of the data output unit. 3. The parameter multiplexing unit adds a compression parameter of the first compression method to an MSB side or an LSB side of a data block of data compressed by the second method having an 8-bit width. Claim 2
A data receiving device according to claim 1. 4. The SMPTE 305
M on the data block of the SDTI signal specified by M
The data reception according to any one of claims 1 to 3, wherein the data compressed from the first to the eighth bit by the second method and the compression parameter of the first compression method by the ninth bit are arranged. apparatus. 5. The first compressed data is data compressed by an MPEG system, and the second compressed data is DV data.
5. The data receiving device according to claim 1, wherein the data is data compressed by a CPRO method. 6. A data transmission apparatus for converting a compression scheme of compressed data mapped on a data block of a predetermined signal and outputting the converted data, wherein the data transmission apparatus demaps data on a data block of an input signal to obtain a first data. A demapping unit that outputs second compressed data in which compression parameters of the compression method are multiplexed, and a compression parameter of the first compression method that is multiplexed in the second compressed data output from the demapping unit. A parameter separation unit that separates and outputs the second compressed data as it is, a data conversion unit that converts the second compressed data output from the parameter separation unit into uncompressed data and outputs the same, and the data conversion unit The non-compressed data output from the first compression method is output using the compression parameter of the first compression method output from the parameter separation unit. And a data compression unit that is condensation and outputting, the data transmission device. 7. The parameter separation unit converts a compression parameter of a first compression method multiplexed on the second compressed data output from the demapping unit into 8-bit width parallel data and outputs the data. A first data output unit, a second data output unit that directly outputs the second compressed data output from the demapping unit, and a second compressed data output from the demapping unit. The data transmitting apparatus according to claim 6, further comprising: a pulse generator that generates a pulse that synchronizes an output timing of the first data output unit and an output timing of the second data output unit. 8. The SMPTE 30
The data on the data block of the SDTI signal specified by 5M is demapped, and the second compressed data having an 8-bit width and the second compressed data added to the MSB side or the LSB side of the data block of the data are demultiplexed. Outputting a compression parameter of the first compression method;
The data transmission device according to claim 6. 9. The first compressed data is data compressed by the MPEG system, and the second compressed data is DV data.
9. The data transmitting apparatus according to claim 6, wherein the data is data compressed by a CPRO method. 10. A data receiving method for converting a compression method of a received compressed data and outputting the converted data, the method comprising converting the received first compressed data into uncompressed data and outputting the data, and a first compression method. Separating and outputting the compression parameters of the first compression method; compressing and outputting the uncompressed data by the second compression method; and outputting the second compression parameter of the first compression method.
A data receiving method, comprising: multiplexing the compressed data with the compressed data and outputting the data; and mapping and outputting the second compressed data and the compression parameter of the first compression method onto a data block of a predetermined signal. 11. A data transmission method for converting a compression scheme of compressed data mapped on a data block of a predetermined signal and outputting the converted data, the method comprising: demapping a signal mapped on a predetermined data block to obtain a first signal. Outputting the second compressed data in which the compression parameters of the first compression method are multiplexed; separating and outputting the compression parameters of the first compression method multiplexed in the second compressed data; Outputting the data compressed by the compression method as it is, converting the second compressed data into uncompressed data, and outputting the uncompressed data, using a compression parameter of the first compression method. And compressing and outputting the compressed data using a first compression method.