VSB communication system

• US 7,634,006 B2
• Filed: 10/21/2004
• Issued: 12/15/2009
• Est. Priority Date: 04/18/2001
• 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
• Primary Examiner(s): Philippe; Gims S
• Application Number:
  US10/971,281
• Publication Number:
  US 20060039462A1
• Time in Patent Office: 1,881 Days
• Field of Search: 375/240.1, 375/240.01, 375/240.25, 375/321, 348/726, 714/756, 714/786
• US Class Current: 375/240.1
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/66 involving data partitioning, i.e. separation of data into packets or partitions according to importance
• CPC Class Codes: H04N 19/68 involving the insertion of resynchronisation markers into the bitstream
• 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 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002

Abstract

A VSB communication system comprises a VSB transmission system and a VSB reception system. The VSB transmission system multiplexes a coded MPEG data and a coded supplemental data having a null sequence inserted therein, with required multiplexing information included in a field synchronization signal or in a supplemental data according to a number of the supplemental data packets being transmitted. The VSB reception system detects the required multiplexing information from the field synchronization signal or the supplemental data and decodes the multiplexed data by using the null sequence and the detected multiplexing information, as well as demultiplexes the multiplexed data into the MPEG data and the supplemental data.

Claims

1. A VSB reception system for receiving a data field comprising multiplexed main data segments and enhanced supplemental data segments, the VSB reception system comprising:

a VSB receiver for receiving and decoding the data field;

a multiplexing information detector for detecting multiplexing information from the data field, wherein the multiplexing information contains information required for demultiplexing the main data segments and the enhanced supplemental data segments from the decoded data field;

a demultiplexer for demultiplexing the data field based on the detected multiplexing information into the main data segments and the enhanced supplemental data segments; and

a supplemental data processor for processing the enhanced supplemental data segments demultiplexed from the demultiplexer to obtain original supplemental data packets.

2. The VSB reception system of claim 1, wherein the multiplexing information is included in a field synchronizing signal segment included in the data field.

3. The VSB reception system of claim 1, wherein the enhanced supplemental data segments and the main data segments in the data field are multiplexed at a predetermined ratio.

4. The VSB reception system of claim 3, wherein a MAP of the plurality of supplemental data segments in the data field is expressed by the following equations:

$\mathrm{for}<br><br><br><br>0\le <br><br>P\le <br><br>39<br><br>\text{;<br><br>}<br><br>\mathrm{MAP}=<br><br>\{s<br><br><br><br>s=4<br><br>i+1,i=0,1,\mathrm{\dots <br><br>}<br><br>,2<br><br>P-1\};<br><br>$ $\begin{array}{c}\mathrm{for}<br><br><br><br>40\le <br><br>P\le <br><br>78<br><br>\text{;<br><br>}<br><br>\mathrm{MAP}=<br><br>\{s<br><br><br><br>s=4<br><br>i+1,i=0,1,\mathrm{\dots <br><br>}<br><br>,77\}<br><br>U\\ <br><br>\{s<br><br><br><br>s=4<br><br>i+3,i=0,1,\mathrm{\dots <br><br>}<br><br>,2<br><br>P-79\};<br><br>\\ \mathrm{for}<br><br><br><br>79\le <br><br>P\le <br><br>117<br><br>\text{;<br><br>}<br><br>\mathrm{MAP}=<br><br>\{s<br><br><br><br>s=4<br><br>i+1,i=0,1,\mathrm{\dots <br><br>}<br><br>,77\}<br><br>U\\ <br><br>\{s<br><br><br><br>s=4<br><br>i+3,i=0,1,\mathrm{\dots <br><br>}<br><br>,77\}<br><br>U\\ <br><br>\{s<br><br><br><br>s=4<br><br>i+2,i=0,1,\mathrm{\dots <br><br>}<br><br>,2<br><br>P-157\};<br><br>\mathrm{and}\\ \mathrm{for}<br><br><br><br>118\le <br><br>P\le <br><br>156<br><br>\text{;<br><br>}<br><br>\mathrm{MAP}=<br><br>\{s<br><br><br><br>s=4<br><br>i+1,i=0,1,\mathrm{\dots <br><br>}<br><br>,77\}<br><br>U\\ <br><br>\{s<br><br><br><br>s=4<br><br>i+3,i=0,1,\mathrm{\dots <br><br>}<br><br>,77\}<br><br>U\\ <br><br>\{s<br><br><br><br>s=4<br><br>i+2,i=0,1,\mathrm{\dots <br><br>}<br><br>,77\}<br><br>U\\ <br><br>\{s<br><br><br><br>s=4<br><br>i+4,i=0,1,\mathrm{\dots <br><br>}<br><br>,2<br><br>P-235\};<br><br>\end{array}$

wherein “

P”

denotes a number of the original supplemental data packets, and “

s”

denotes a supplemental data segment position with respect to a field synchronizing signal segment within the data field.

5. The VSB reception system of claim 3, wherein the multiplexing information comprises a number of the original supplemental data packets.

6. The VSB reception system of claim 3, wherein the predetermined ratio is 1:

1 or 1;

3.

7. The VSB reception system of claim 3, wherein a total number of the enhanced supplemental data segments and the main data segments included in the data field is 312.

8. The VSB reception system of claim 3, wherein the main data segments comprise MPEG data segments.

9. The VSB reception system of claim 3, wherein positions of the enhanced supplemental data segments are assigned to every fourth segment from at least one predetermined start position within the data field.

10. A method of processing digital broadcast data in a digital television (DTV) receiver, the method comprising:

demodulating a DTV signal in a demodulator, the DTV signal containing first service data multiplexed with second service data;

detecting signaling information from the demodulated DTV signal in a detector;

decoding the first service data in the demodulated DTV signal in a first decoder for first error correction in order to correct errors in the first service data that occurred during reception of the DTV signal; and

decoding the error-corrected first service data in a second decoder for second error correction in order to additionally correct errors in the first service data that occurred during reception of the DTV signal.

11. The method of claim 10, wherein the signaling information is included in the first service data.

12. The method of claim 10, wherein the first service data are Reed-Solomon (RS) decoded for the second error correction.

13. The method of claim 10, further comprising detecting predefined data included in the demodulated first service data.

14. The method of claim 13, further comprising performing channel equalization on the demodulated first service data using the predefined data.

15. The method of claim 10, further comprising decoding the first and second service data in the demodulated signal for third error correction.

16. The method of claim 10, wherein the first and second service data are trellis-decoded for the third error correction.

17. The method of claim 10, wherein the first service data comprise additional service data and the second service data comprise data for legacy VSB receiver.

18. A transmission system for processing audio/video (AV) data, the transmission system comprising:

an RS encoder configured to RS encode first AV data having a first attribute for forward error correction (FEC) by adding RS parities to the first AV data, the first AV data input to the RS encoder through a first path and including at least audio or video data;

a multiplexer configured to multiplex the RS-encoded first AV data with second AV data based on multiplexing information, the second AV data input to the multiplexer through a second path different from the first path and having a second attribute different from the first attribute and including at least audio or video data; and

an interleaver configured to interleave the multiplexed first and second AV data for burst error correction, the interleaver dispersing the multiplexed first and second AV data.

19. The transmission system of claim 18, further comprising a pilot inserter configured to insert pilot signals into the interleaved first and second AV data.

20. The transmission system of claim 18, further comprising a trellis coder configured to convert the interleaved first and second AV data into corresponding symbols.

21. The transmission system of claim 18, wherein the multiplexing information comprises multiplexing ratio and locations.

22. A method of processing AV data in a transmission system, the method comprising:

RS encoding first AV data in an RS encoder by adding RS parities to the first AV data, the first AV data input to the RS encoder through a first path and having a first attribute for forward error correction (FEC) and including at least audio or video data;

multiplexing the RS-encoded first AV data with second AV data in a multiplexer based on multiplexing information, the second AV data input to the multiplexer through a second path different from the first path and having a second attribute different from the first attribute and including at least audio or video data; and

interleaving the multiplexed first and second AV data in an interleaver for burst error correction, wherein interleaving the multiplexed first and second AV data comprises dispersing the multiplexed first and second AV data.

23. The method of claim 22, further comprising inserting pilot signals into the interleaved first and second AV data.

24. The method of claim 22, further comprising converting the interleaved first and second AV data into corresponding symbols.

25. The method of claim 22, wherein the multiplexing information comprises multiplexing ratio and locations.