KR100287868B1 - A signal recording and reproducing apparatus of a digital storage medium - Google Patents

Abstract

A signal recording and reproducing apparatus for a digital storage medium is for reproducing an audio / video signal recorded on a digital storage medium and simultaneously synchronizing a program to improve a decoding delay. A PID information extracting means for extracting PID information from a transport stream of MPEG audio / video data inversely formatted in the data inversion formatter; A PSI table generating means for inserting the PSI table into one PSI table, a null packet generating means for selectively inserting a null packet for synchronizing the transport stream of the MPEG audio / video data with the PSI table information, The signal formatted in the inverse formatter and the PSI table generating means And a re-multiplexing means for re-multiplexing the null packet generated by the null packet generating means and outputting the generated PSI packet, and the signal recording apparatus of the digital storage medium is a signal recording and reproducing apparatus The apparatus includes PID information extracting means for extracting PID information from a bit stream, PSI table generating means for generating a PSI table in accordance with the extracted PID information, and a recording rate of the input bit rate and PSI table information And outputting the same to the data formatter.

Description

A signal recording and reproducing apparatus of a digital storage medium

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 for a digital storage medium for recording and reproducing signals on and from a digital storage medium.

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

FIG. 1 is a diagram illustrating a program mapping layer (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.

A user interface unit 1 for recording or reproducing an audio / video bitstream, and an audio / video decoder unit for decoding an ISO / IEC 13818 bitstream according to a signal of the user interface unit 1, And a digital storage medium 2 recorded or reproduced.

The user interface unit 1 comprises a system encoder 1a for encoding and outputting the audio / video bitstream, and a system decoder 1a for decoding the ISO / IEC 13818 bit stream reproduced in the digital storage medium 2. [ And a system decoder 1b for outputting the data.

The operation of the signal recording and reproducing apparatus of the digital storage medium according to the related art will now be described in detail with reference to the accompanying drawings.

Unlike existing analog broadcasting systems, the current Mugunghwa satellite broadcasting system complies with the ISO / IEC 13818 standard.

In order to decode the signal of this method, the PID (Program Specific Information) information transmitted is first decoded to find the PID (Program ID) of the desired audio / video signal as shown in FIG. 1, As shown in the figure, various programs can be used to synchronize audio / video signals on a multiplexed bitstream to watch satellite broadcasts.

Therefore, in order to decode an audio / video signal of a desired program, the receiver firstly finds and decodes 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 in the PAT.

At this time, since the PMT has a PID of an ES (Elementary Stream) packet of audio / video / data connected with a direct program or the like, the receiver can use the information to decode and view a desired program.

However, in the structure of a general digital storage medium as shown in FIG. 3, when an audio / video bitstream is inputted, the user interface unit 1 outputs a signal for recording it in the digital storage medium 2 (DSM_CC).

The user interface unit 1 to which the approval signal DSM_ACK is inputted from the digital storage medium 2 records the audio / video bitstream into 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 approval signal DSM_ACK to convert the ISO / IEC 13818 bitstream into the digital storage medium 2, .

In this case, since the ISO / IEC 13818 bitstream includes not only the audio / video data but also the PSI information, it is possible to designate a program to be decoded at the time of reproduction.

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

Then, when the approval signal DSM_ACK is inputted from the digital storage medium 2, the user interface unit 1 reproduces the recorded ISO / IEC 13818 bit stream.

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 / reproducing apparatus of the digital storage medium according to the related art simply records and reproduces the audio / video signal and the PSI information transmitted by the receiver. Therefore, There is a problem that a decoding delay occurs from the PSI information to the PID information specifying the recording program.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an audio / And a playback apparatus.

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

2 is a diagram showing a program mapping layer (Mapping Hierarchy) of FIG. 1; FIG.

3 is a diagram showing the structure of the program stream of FIG. 2

4A and 4B illustrate an embodiment of a signal recording / reproducing apparatus for a digital storage medium according to the present invention

5 is a diagram showing the detailed configuration of a program specific information (PSI) table generating unit of FIGS. 4A and 4B

DESCRIPTION OF THE REFERENCE NUMERALS

101: buffer 102: data formatter

103: recording unit 104: digital storage medium

105: re-production part 106: data inverse formatter

107: PID information extracting unit 108: PSI table generating unit

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

108c: Stream type / PID information correction unit 108e:

108d: stream type and PID information CRC decryption unit

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

According to another aspect of the present invention, there is provided a signal recording / reproducing apparatus for a digital storage medium having a data inversion formatter, the apparatus comprising: PID information extracting means for extracting PID information from a transport stream of video data, PSI table generating means for inserting the extracted PID into a predetermined PSI table, transporting the MPEG audio / A null packet generating means for selectively inserting a null packet for synchronizing the stream and the PSI table information, a PSI packet generated by the signal formatted by the data inverse formatter and the PSI table generating means, And re-multiplexing means for re-multiplexing and outputting null packets The.

According to another aspect of the present invention, there is provided a signal recording apparatus for a digital storage medium having a data formatter, the apparatus comprising: a PID information extracting means for extracting PID information from a bitstream; PSI table generating means for generating a PSI table in accordance with the extracted PID information and rate matching means for matching the input bit rate of the bit stream 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 for a digital storage medium according to the present invention will be described with reference to the accompanying drawings.

4A and 4B illustrate an embodiment of a signal recording and reproducing apparatus for a digital storage medium according to the present invention. FIG. 4A shows a buffer 101 for buffering and outputting a difference between an input data rate and a write data rate of a bitstream, A data formatter 102 for formatting the buffered bit stream in a data format suitable for recording and outputting the formatted bit stream in a digital storage medium 101, a recording unit 103 for recording the formatted data in a digital storage medium 104, A data inversion formatter 106 for inversely formatting and outputting the format of the reproduced data and a data inversion formatter 106 for outputting the inverse format in the data inverse formatter 106, A PID information extracting unit 107 for extracting PID information from the transport stream of the MPEG audio / video data, a PSI table generating unit 1 for inserting the extracted PID into a predetermined PSI table A null packet generator 109 for selectively inserting a null packet for synchronizing the transport stream of the inversely formatted MPEG audio / video data and the PSI table information; And a re-multiplexing unit 110 for re-multiplexing the formatted signal and the PSI packet generated by the PSI table generation unit 108 by re-multiplexing the null packet generated in the null packet generation unit 109.

4B is a block diagram illustrating 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, A data formatting unit 204 for formatting and outputting a bitstream of the data rate matching unit 203 in a data format suitable for recording, A recording unit 205 for recording the formatted data on a digital storage medium 206, a re-production unit 207 for reproducing data recorded on the digital storage medium 206, And a null packet for synchronizing the transport stream of the MPEG audio / video data in the inversely formatted manner with the transport stream of the MPEG audio / video data, A re-multiplexing unit 210 for re-multiplexing a signal formatted in the data inversion formatter 208 and a null packet generated in the null packet generator 209 and outputting the re-multiplexed signal, do.

The rate matching unit 203 is a buffer.

5 shows a detailed configuration of the PIS table generating unit 108 (202) of FIGS. 4A and 4B. The PSI table generating unit 108 (202) A program PID information correcting unit 108a (202a) for correcting the PID information, and a program PID information CRC correcting unit 108b for correcting the CRC according to the program PID information corrected by the program PID information correcting unit 108a A stream type / PID information modification unit 108c for modifying the stream type and PID information according to the extracted audio / video PID information, a stream type / PID information modification unit 108c, A stream type and PID information CRC correction unit 108d (202d) for modifying the CRC according to the stream type and PID information modified by the stream type and PID information, Encode a transport stream of video data Than an output encoder (108e) (202e) to.

The operation of the signal recording and reproducing apparatus of the digital storage medium according to the present invention will now be described in detail with reference to the accompanying drawings.

4A, the buffer 101 in the recording / reproducing apparatus of the digital storage medium buffers and outputs the difference between the input data rate and the write data rate of the bit stream.

Then, the data formatter 102 formats and outputs the buffered bit stream in 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. [

The re-production unit 105 reproduces the data recorded on the digital storage medium 104 and outputs the reproduced data.

Then, the data inverse formatter 106 inversely formats the format of the inversely formatted data and outputs the formatted data.

The PID information extraction unit 107 then extracts the PID information from the transport stream of the MPEG audio / video data inversely formatted in the data inverse formatter 106 and outputs the extracted PID information.

Then, the PSI table generation unit 108 inserts the extracted PID into the predetermined PSI table and outputs the PSI table.

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

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

"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 modification unit 108b modifies and outputs the CRC according to the program PID information modified by the program PID information modification unit 108a.

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

The stream type / PID information modification unit 108c modifies stream_type and elementary_PID among the programs according to the audio / video PID information extracted by the PID information extraction unit 107, and outputs the modified stream_type and elementary_PID.

"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 modification unit 108d modifies and outputs the CRC according to the stream type and PID information modified by the stream type / PID information modification unit 108c (202c).

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

On the other hand, the null packet generating unit 109 selectively inserts a null packet for synchronizing the transport stream of the inversely formatted MPEG audio / video data and the PSI table information, and outputs the null packet.

The re-multiplexing unit 110 re-multiplexes the signal formatted in the data inversion formatter 106 and the PSI packet generated in the PSI table generation unit 108 into a null packet generated in the null packet generation unit 109, And outputs it.

On the other hand, the PID information extracting unit 201 in the recording and reproducing apparatus of the digital storage medium as shown in FIG. 4B extracts the PID information from the bit stream.

Then, the PSI table generating unit 202 generates and outputs the PSI table according to the extracted PID information.

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

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.

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

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

Then, the transmission rate matching unit 203 matches the input transmission rate of the bitstream with the transmission rate of the PSI table information and outputs the same to the data formatter.

The data formatter 204 then formats and outputs the bit stream of the rate matcher 203 in a data format suitable for recording.

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

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

Then, the data inverse formatter 208 inversely formats the format of the inverse formatted data and outputs it.

The null packet generator 209 selectively inserts a null packet for synchronizing with the transport stream of the inversely formatted MPEG audio / video data.

Accordingly, the re-multiplexing unit 210 re-multiplexes the signal formatted in the data inversion formatter 208 and the null packet generated in the null packet generator 209 and outputs the re-multiplexed signal.

As described above, the signal recording / reproducing apparatus of the digital storage medium according to the present invention inserts not only audio / video signals but also corresponding PSI information into a digital storage medium and extracts corresponding PSI information at the time of recording or reproducing the same, There is an effect that the decoding delay can be improved by synchronizing.

Claims (4)

A signal recording and reproducing apparatus for a digital storage medium having a data inversion formatter, PID information extracting means for extracting PID information from a transport stream of MPEG audio / video data inversely formatted in said data inverse formatter; A PSI table generating means for inserting the extracted PID into a predetermined PSI table; A null packet generating means for selectively inserting a null packet for synchronizing the transport stream of the inversely formatted MPEG audio / video data and the PSI table information; And a re-multiplexing means for re-multiplexing the signal formatted in the data inversion formatter and the PSI packet generated by the PSI table generating means, and re-multiplexing the null packet generated by the null packet generating means. . The method according to claim 1, The PSI table generating means A program PID information modifying unit for modifying the program PID information according to the extracted audio / video PID information; A program PID information CRC modifying unit for modifying the CRC according to the program PID information modified by the program PID information modifying unit; A stream type / PID information modifying unit for modifying stream type and PID information according to the extracted audio / video PID information; A stream type and PID information CRC modifying unit for modifying the CRC according to the stream type and PID information modified by the stream type / PID information modification unit; And an encoding unit for encoding and outputting a transport stream of audio / video data including the modified program PID information, the stream type, and the PID information. A signal recording and reproducing apparatus for a digital storage medium having a data formatter, PID information extracting means for extracting PID information from a bitstream; A PSI table generating means for generating a PSI table according to the extracted PID information; And rate matching means for matching the input bit rate of the bit stream with the write rate of the PSI table information and outputting the same to the data formatter. The method of claim 3, The PSI table generating means A program PID information modifying unit for modifying the program PID information according to the extracted audio / video PID information; A program PID information CRC modifying unit for modifying the CRC according to the program PID information modified by the program PID information modifying unit; A stream type / PID information modifying unit for modifying stream type and PID information according to the extracted audio / video PID information; A stream type and PID information CRC modifying unit for modifying the CRC according to the stream type and PID information modified by the stream type / PID information modification unit; And an encoding unit for encoding and outputting the transport stream of the audio / video data including the modified program PID information, the stream type, and the PID information.