Communication system in digital television

• US 20020181599A1
• Filed: 04/12/2002
• Published: 12/05/2002
• Est. Priority Date: 04/25/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, In Hwan, Gu, Young Mo, Kwak, Kook Yeon, Kang, Kyung Won
• Granted Patent: US 7,092,447 B2
• Time in Patent Office: Days
• US Class Current: 375/240.27
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/253 with concatenated codes
• CPC Class Codes: H03M 13/256 with trellis coding, e.g. with convolutional codes and TCM
• CPC Class Codes: H03M 13/2936 comprising an outer Reed-Solomon code and an inner convolutional code
• CPC Class Codes: H03M 13/6538 ATSC VBS systems
• CPC Class Codes: H04N 21/23611 Insertion of stuffing data into a multiplex stream, e.g. to obtain a constant bitrate synchronisation arrangements in time-division multiplex systems using bit stuffing for systems with different or fluctuating information rates H04J3/073
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams

Abstract

A VSB communication system or transmitter for processing supplemental data packets with MPEG-II data packets includes a VSB supplemental data processor and a VSB transmission system. The VSB supplemental data processor includes a Reed-Solomon coder for coding the supplemental data to be transmitted, a null sequence inserter for inserting a null sequence to an interleaved supplemental data for generating a predefined sequence, a header inserter for inserting an MPEG header to the supplemental data having the null sequence inserted therein, a multiplexer for multiplexing an MPEG data coded with the supplemental data having the MPEG header added thereto in a preset multiplexing ratio and units. The output of the multiplexer is provided to an 8T-VSB transmission system for modulating a data field from the multiplexer and transmitting the modulated data field to a VSB reception system.

Claims

1. A VSB transmitter for use with an MPEG data signal and a supplemental data signal, the VSB transmitter comprising:

a VSB supplemental data processor comprising;

a forward error correction coder that codes the supplemental data signal;

a null sequence inserter for inserting a null sequence to the supplemental data signal subjected to the forward error correction coder for generating a predefined sequence;

a header inserter for inserting a header to the supplemental data signal having the null sequence inserted therein; and

a multiplexer for multiplexing the MPEG data signal and the supplemental data signal having the header inserted thereto in at least one of a predetermined multiplexing ratio and unit; and

a VSB transmission system connected to the VSB supplemental data processor for modulating an output from the multiplexer to form at least one data field comprising a plurality of segments that includes at least one segment formed from the supplemental data signal and at least one segment formed from the MPEG data signal wherein said VSB transmission system includes a trellis input bit generator for outputting an input bit value so as to constantly maintain a storage value of a memory in a trellis encoder prior to input of the additional data to the trellis coder.

2. The VSB transmitter of claim 1, wherein the forward error correction coder is a Reed-Solomon coder.

3. The VSB transmitter of claim 2, wherein the supplemental data signal includes at least one data packet having X bytes and the Reed-Solomon coder provides parity bytes of Y bytes, wherein a total of X and Y bytes is 184 bytes.

4. The VSB transmitter of claim 3, wherein the header inserter adds three bytes of header information to the data packet, wherein the header information contains program identification.

5. The VSB transmitter of claim 3, wherein the null sequence inserter divides the one data packet of the supplemental data signal into a plurality of data packets.

6. The VSB transmitter of claim 5, wherein the predefined sequence has substantially the same occurrence of bits “

1” and

“

0”

.

7. The VSB transmitter of claim 1, further comprising an interleaver receiving data from the forward error correction coder and outputting to the null sequence inserter, the interleaver interleaves the supplemental data signal coded by forward error correction code.

8. The VSB transmitter of claim 7, wherein the forward error correction coder is a Reed-Solomon coder.

9. The VSB transmitter of claim 8, wherein the supplemental data signal includes at least one data packet having X bytes and the Reed-Solomon coder provides parity bytes of Y bytes, wherein a total of X and Y bytes is 184 bytes.

10. The VSB transmitter of claim 9, wherein the header inserter adds three bytes of header information to the data packet, wherein the header information contains program identification.

11. The VSB transmitter of claim 9, wherein the null sequence inserter divides the one data packet of the supplemental data signal into a plurality of data packets.

12. The VSB transmitter of claim 11, wherein the predefined sequence has substantially the same occurrence of bits “

1” and

“

0”

.

13. The VSB transmitter of claim 1, wherein the multiplexing unit is a segment, and the multiplexing ratio varies with amounts of MPEG data packets representing the MPEG data signal and supplemental data packets representing the supplemental data signal.

14. The VSB transmitter of claim 13, wherein the multiplexing ratio of the supplemental data packets and the MPEG data packets in the multiplexer is one segment to one segment.

15. The VSB transmitter of claim 13, wherein the multiplexing ratio of the supplemental data packets and the MPEG data packets in the multiplexer is one segment to three segments.

16. The VSB transmitter of claim 1, wherein the multiplexer is responsive to a field synchronizing signal used for synchronizing a data frame of the VSB transmission system.

17. The VSB transmitter of claim 1, wherein the data field has 312 data segments and one field synchronizing segment.

19. The method claim 18, wherein the Reed-Solomon parity is included to only one of the supplemental data packets.

20. The method of claim 18, wherein the inserting null sequence data includes the steps of;

dividing the supplemental data packet into two supplemental data packets having the same numbers of bytes; and

inserting a null sequence having the same bytes with the supplemental data packet into each one of the supplemental data packets to provide two supplemental data packets each having the null sequence inserted therein.

21. The method of claim 20, wherein each one of the supplemental data packets has 184 bytes comprising 92 bytes of supplemental data 92 bytes of the null sequence.

22. The method of claim 18, wherein the MPEG header is an identification code for identifying whether the multiplexed data is the supplemental data packet or the MPEG data packet.

18. A method for a supplemental data packet and an MPEG data packet in a VSB transmitter comprising a VSB supplemental data processor and a VSB transmission system, the method comprising the steps of:

subjecting the supplemental data packet of preset bytes to a Reed-Solomon coding and adding a Reed-Solomon parity data of preset bytes to the supplemental data packet;

interleaving the coded supplemental data packet;

inserting null sequence data into the interleaved supplemental data packet for producing at least one supplemental data packet of a preset number of bytes;

adding an MPEG header of preset bytes to each one of the supplemental data packets;

multiplexing the MPEG data packet with the supplemental data packet at a preset multiplexing ratio; and

modulating the data multiplexed at the preset multiplexing ratio through the VSB transmission system

controlling wherein said VSB transmission system includes a trellis input bit generator for outputting an input bit value so as to constantly maintain a storage value of a memory in a trellis encoder prior to input of the additional data to the trellis coder.