KR20000002152A - Signal record regenerating device of digital storage media - Google Patents

Abstract

PURPOSE: A signal record regenerating device is provided to improve the decoding delay by motivating a program together with the regeneration of audio/video signals recorded in digital storage media. CONSTITUTION: The signal record regenerating device comprises: a PID information extracting piece(107) for extracting the PID information from a transport stream of the MPEG audio/video data; a PSI table generating piece(108) for inserting the extracted PID into the previously set PSI table; a null packet generating piece(109) for selectively inserting the null packet; and a re-multiplexing piece(110) for outputting by re-multiplexing the null packet.

Description

Signal recording and reproducing device of digital storage media

The present invention relates to a digital storage medium of a digital satellite broadcasting system, and more particularly, to a signal recording and reproducing apparatus of a digital storage medium for recording and reproducing a signal on a digital storage medium.

Hereinafter, a signal recording and reproducing apparatus of a digital storage medium according to the prior art will be described with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a program mapping hierarchy, FIG. 2 is a diagram illustrating a structure of a program stream of FIG. 1, and FIG. 3 is a diagram illustrating a structure of a general digital storage medium.

As shown in FIG. 3, a user interface unit 1 for recording or playing back an audio / video bitstream, and an ISO / IEC 13818 bitstream in accordance with a signal of the user interface unit 1 are provided. And a digital storage medium 2 to be recorded or reproduced.

The user interface unit 1 includes a system encoder 1a for encoding and outputting the audio / video bitstream and an ISO / IEC 13818 bitstream reproduced in the digital storage medium 2. And a system decoder 1b for outputting.

Operation of the signal recording and reproducing apparatus of the conventional digital storage medium configured as described above will be described in detail with reference to the accompanying drawings.

Currently, Mugunghwa satellite broadcasting system is digitally compliant with ISO / IEC 13818 standard, unlike the existing analog broadcasting system.

In order to decode the signal of this type, the receiver first decodes the transmitted program specific information (PSI) information as shown in FIG. 1 to find a PID (Program ID) of a desired audio / video signal, As shown in the figure, several programs are tuned to an audio / video signal on a multiplexed bitstream so that they can watch satellite broadcasts.

Therefore, in order to decode the audio / video signal of the desired program, the receiver must first find and decode a PAT (Program Association Table) having a PID of '0' among the PSI information.

The receiver then obtains the PID of the corresponding Program Map Table (PMT) from the number assigned to the channel associated with the program or data service called the program number in the PAT.

In this case, the PMT has a PID of an elementary stream (ES) packet of audio / video / data connected to a direct program, so that the receiver can decode and watch a desired program using these information.

However, in the structure of a general digital storage medium as shown in FIG. Outputs (DSM_CC).

Subsequently, the user interface 1 to which the acknowledgment signal DSM_ACK is input from the digital storage medium 2 records the audio / video bitstream in the digital storage medium 2.

That is, the system encoder 1a in the user interface unit 1 encodes an audio / video bitstream according to the acknowledgment signal DSM_ACK to convert an ISO / IEC 13818 bitstream into the digital storage medium 2. To record.

Since the ISO / IEC 13818 bitstream includes the PSI information as well as the audio / video data, it is possible to designate a program to decode during playback.

On the other hand, the user interface unit 1 outputs a signal DSM_CC for reproducing the ISO / IEC 13818 bitstream recorded on the digital storage medium 2.

Thereafter, when the acknowledgment signal DSM_ACK is input from the digital storage medium 2, the user interface unit 1 reproduces the recorded ISO / IEC 13818 bitstream.

That is, the system decoder 1b in the user interface unit 1 decodes the ISO / IEC 13818 bitstream reproduced in the digital storage medium 2 and outputs an audio / video bitstream.

However, the signal recording and reproducing apparatus of the digital storage medium according to the prior art simply plays back the audio / video signal and the PSI information transmitted by the receiver and plays back the data until the receiver performs the program decoding operation. There is a problem in that a decoding delay occurs until the PID information designating the recording program is found among the PSI information.

Accordingly, the present invention has been made to solve the above problems, and the signal recording of the digital storage medium to improve the decoding delay by synchronizing the program with the reproduction of the audio / video signal recorded on the digital storage medium. The purpose is to provide a playback device.

1 is a view showing the structure of a general digital storage medium

FIG. 2 is a diagram illustrating a program mapping hierarchy of FIG. 1.

3 is a view showing the structure of a program stream of FIG.

4A and 4B show an exemplary embodiment of a signal recording and reproducing apparatus of a digital storage medium according to the present invention.

FIG. 5 is a diagram illustrating a detailed configuration of a program specific information (PSI) table generator of FIGS. 4A and 4B;

Explanation of symbols for main parts of the drawings

101: buffer 102: data formatter

103: recording unit 104: digital storage medium

105: re-production unit 106: data inverse formatter

107: PID information extraction unit 108: PSI table generation unit

108a: program PID information correction 108b: program PID information CRC correction

108c: stream type / PID information correction unit 108e: encoding unit

108d: stream type and PID information CRC correction

109: null packet generation unit 110: re-multiplexing unit

A feature of a signal reproducing apparatus of a digital storage medium according to the present invention for achieving the above object is a signal recording and reproducing apparatus of a digital storage medium having a data inverse formatter, wherein the MPEG audio is inversely formatted by the data inverse formatter PID information extracting means for extracting PID information from a transport stream of the video / video data, PSI table generating means for inserting the extracted PID into a preset PSI table, and transporting the inversely formatted MPEG audio / video data. Null packet generating means for selectively inserting null packets for synchronizing the stream and PSI table information, and PSI packets generated by the PSI table generating means and signals formatted by the data inverse formatter generated by the null packet generating means. It consists of re-multiplexing means for re-multiplexing and outputting null packets. The.

A feature of the signal recording apparatus of the digital storage medium according to the present invention for achieving the above object is, in the signal recording apparatus of the digital storage medium having a data formatter, PID information extraction means for extracting PID information from the bitstream And a PSI table generating means for generating a PSI table according to the extracted PID information, and a rate matching means for matching the input rate of the bitstream with the write rate of the PSI table information and outputting the same to the data formatter. have.

Hereinafter, a preferred embodiment of a signal recording and reproducing apparatus of a digital storage medium according to the present invention will be described with reference to the accompanying drawings.

4A and 4B are exemplary diagrams illustrating a signal recording and reproducing apparatus of a digital storage medium according to the present invention, and FIG. 4A is a buffer 101 for buffering and outputting a difference between an input transmission rate and a recording transmission rate of a bitstream; A data formatter 102 for formatting and outputting the bitstream buffered at 101 into a data format suitable for recording, a recording unit 103 for recording the formatted data on a digital storage medium 104, and the digital storage. A re-production section 105 for reproducing data recorded on the medium 104, a data inverse formatter 106 for reformatting and outputting the format of the reproduced data, and a reverse format in the data inverse formatter 106; A PID information extracting unit 107 for extracting PID information from a transport stream of MPEG audio / video data, and a PSI table generating unit (1) for inserting the extracted PID into a preset PSI table (1). 08), a null packet generator 109 for selectively inserting a null packet for synchronizing the transport of the de-formatted MPEG audio / video data with the PSI table information, and the data inverse formatter 106; The re-multiplexing unit 110 re-multiplexes and outputs a signal formatted by the PSI packet generated by the PSI table generator 108 and a null packet generated by the null packet generator 109.

4B illustrates a PID information extracting unit 201 for extracting PID information from a bitstream, a PSI table generating unit 202 for generating a PSI table according to the extracted PID information, and an input transmission rate and a PSI of the bitstream. A rate matching unit 203 for matching the write rate of table information to the data formatter, and a data formatter 204 for formatting and outputting the bitstream of the rate matching unit 203 in a data format suitable for recording; A recording unit 205 for recording the formatted data on the digital storage medium 206, a re-production unit 207 for reproducing the data recorded on the digital storage medium 206, and a format of the reproduced data. A data inverse formatter 208 for reverse-formatting and outputting a null packet and a null packet for synchronizing with a transport stream of the de-formatted MPEG audio / video data. Is composed of a null packet generator 209 and a re-multiplexer 210 for re-multiplexing and outputting a signal formatted by the data inverse formatter 208 and a null packet generated by the null packet generator 209. do.

The rate matching unit 203 is a buffer.

5 is a diagram illustrating a detailed configuration of the PIS table generators 108 and 202 of FIGS. 4A and 4B, wherein the PSI table generators 108 and 202 are programmed according to the extracted audio / video PID information. Program PID information correction unit 108a (202a) for correcting the PID information, and program PID information CRC correction unit (108b) for modifying the CRC according to the program PID information modified in the program PID information correction unit (108a) (202a). 202b, stream type / PID information correction unit 108c and 202c for modifying stream type and PID information according to the extracted audio / video PID information, and stream type / PID information correction unit 108c. The stream type and PID information CRC correction unit 108d and 202d for modifying the CRC according to the stream type and PID information modified at 202c, and the audio / program including the modified program PID information and stream type and PID information. Encode the transport stream of video data Than an output encoder (108e) (202e) to.

Operation of the signal recording and reproducing apparatus of the digital storage medium according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the buffer 101 in the recording / playback apparatus of the digital storage medium as shown in FIG. 4A buffers and outputs the difference between the input transmission rate and the recording transmission rate of the bitstream.

The data formatter 102 then formats and outputs the bitstream buffered by the buffer 101 in a data format suitable for recording.

Accordingly, the recording unit 103 records the formatted data on the digital storage medium 104.

Thereafter, the re-production unit 105 reproduces and outputs the data recorded in the digital storage medium 104.

The data inverse formatter 106 then inversely formats and outputs the format of the inversely formatted data.

The PID information extracting unit 107 then extracts and outputs PID information from the transport stream of MPEG audio / video data deformatted by the data inverse formatter 106.

Then, the PSI table generator 108 inserts the extracted PID into a preset PSI table and outputs the PSI table.

That is, the program PID information correction unit 108a in the PSI table generator 108 modifies and outputs program PID information according to the audio / video PID information extracted by the PID information extraction unit 107.

The program PID information correction unit 108a modifies and outputs program_map_PID among the following programs according to the audio video PID information extracted by the PID information extraction unit 107.

"program_association_section () {table_id

section_syntax_indicator

'0'

reserved

.........

for (I = 0; i <N; I ++) {

program_number

reserved

program_map_PID}

CRC_32} "

In addition, the program PID information CRC correction unit 108b modifies and outputs the CRC according to the program PID information modified by the program PID information correction unit 108a.

In addition, the stream type / PID information correction unit 108c modifies and outputs the stream type and PID information according to the audio / video PID information extracted by the PID information extraction unit 107.

The stream type / PID information correction unit 108c modifies and outputs stream_type and elementary_PID of the following programs according to the audio / video PID information extracted by the PID information extracting unit 107, respectively.

"TS_program_map_section () {table_id

section_syntax_indicator

'0'

reserved

.........

for (I = 0; i <N; I ++) {

stream_type

reserved

elementary_PID}

CRC_32} "

In addition, the stream type and PID information CRC correction unit 108d modifies and outputs the CRC according to the stream type and PID information modified by the stream type / PID information correction unit 108c and 202c.

Subsequently, the encoding unit 108e encodes and outputs a transport stream of audio / video data including the modified program PID information, stream type, and PID information.

Meanwhile, the null packet generator 109 selectively inserts and outputs a null packet for synchronizing the PSI table information with the transport stream of the de-formatted MPEG audio / video data.

Then, the re-multiplexing unit 110 re-multiplexes the signal formatted by the data inverse formatter 106 and the null packet generated by the null packet generation unit 109 with the PSI packet generated by the PSI table generator 108. To print.

On the other hand, as shown in Fig. 4B, the PID information extracting unit 201 in the recording / playback apparatus of the digital storage medium extracts the PID information from the bitstream.

Then, the PSI table generator 202 generates and outputs a PSI table according to the extracted PID information.

That is, the program PID information correction unit 202a in the PSI table generator 202 modifies and outputs program PID information according to the extracted audio / video PID information.

In addition, the program PID information CRC correction unit 202b modifies and outputs the CRC according to the program PID information modified by the program PID information correction unit 202a.

The stream type / PID information correction unit 202c then modifies and outputs the stream type and PID information according to the extracted audio / video PID information.

In addition, the stream type and PID information CRC correction unit 202d modifies and outputs the CRC according to the stream type and PID information modified by the stream type / PID information correction unit 202c.

Accordingly, the encoding unit 202e encodes and outputs the transport stream of the audio / video data including the modified program PID information, stream type, and PID information.

The rate matching unit 203 then matches the input rate of the bitstream with the write rate of PSI table information and outputs the same to the data formatter.

The data formatter 204 then formats and outputs the bitstream of the rate matching unit 203 in a data format suitable for recording.

Accordingly, the recording unit 205 records the formatted data in the digital storage medium 206.

The re-production unit 207 then reproduces and outputs the data recorded in the digital storage medium 206.

The data inverse formatter 208 then inversely formats and outputs the format of the inversely formatted data.

In addition, the null packet generator 209 selectively inserts and outputs a null packet for synchronizing with the transport stream of the de-formatted MPEG audio / video data.

Accordingly, the re-multiplexer 210 re-multiplexes the signal formatted by the data inverse formatter 208 and the null packet generated by the null packet generator 209.

As described above, the signal recording and reproducing apparatus of the digital storage medium according to the present invention inserts not only an audio / video signal but also corresponding PSI information into the digital storage medium and records the same or extracts the corresponding PSI information during playback to simultaneously reproduce the program. Synchronization has the effect of improving the decoding delay.

Claims (4)

A signal recording and reproducing apparatus of a digital storage medium having a data inverse formatter, PID information extraction means for extracting PID information from a transport stream of MPEG audio / video data deformatted by the data inverse formatter; PSI table generating means for inserting the extracted PID into a preset PSI table; Null packet generating means for selectively inserting a null packet for synchronizing the PSI table information with the transport stream of the deformatted MPEG audio / video data; And re-multiplexing means for re-multiplexing and outputting the signal formatted by the data inverse formatter and the PSI packet generated by the PSI table generating means to re-multiplex and output the null packet generated by the null packet generating means. Signal regeneration device. The method of claim 1, The PSI table generating means Program PID information correction unit for modifying program PID information according to the extracted audio / video PID information; A program PID information CRC correction unit for correcting the CRC according to the program PID information modified by the program PID information correction unit; A stream type / PID information correction unit for modifying the stream type and the PID information according to the extracted audio / video PID information; A stream type and PID information CRC correction unit for modifying the CRC according to the stream type and PID information modified by the stream type / PID information correction unit; And an encoding unit for encoding and outputting the modified program PID information and a transport stream of audio / video data including the stream type and the PID information. A signal recording and reproducing apparatus of a digital storage medium having a data formatter, PID information extracting means for extracting PID information from the bitstream; PSI table generating means for generating a PSI table according to the extracted PID information; And transmission rate matching means for matching the input transmission rate of the bitstream with the recording transmission rate of PSI table information and outputting the same to the data formatter. The method of claim 3, wherein The PSI table generating means Program PID information correction unit for modifying program PID information according to the extracted audio / video PID information; A program PID information CRC correction unit for correcting the CRC according to the program PID information modified by the program PID information correction unit; A stream type / PID information correction unit for modifying the stream type and the PID information according to the extracted audio / video PID information; A stream type and PID information CRC correction unit for modifying the CRC according to the stream type and PID information modified by the stream type / PID information correction unit; And an encoding unit for encoding and outputting the modified program PID information, the transport stream of the audio / video data including the stream type and the PID information.