DIGITAL TELEVISION TRANSMITTING SYSTEM AND RECEIVING SYSTEM AND METHOD OF PROCESSING BROADCAST DATA

• US 20070274401A1
• Filed: 05/23/2007
• Published: 11/29/2007
• Est. Priority Date: 05/23/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jin, Song, Won, Kim, Byoung, Lee, Hyoung, Kim, Jong, Choi, In
• Granted Patent: US 8,351,497 B2
• Time in Patent Office: Days
• US Class Current: 375/240.270
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/15 Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes H03M13/17 takes precedence
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/2732 Convolutional interleaver; Interleavers using shift-registers or delay lines like, e.g. Ramsey type interleaver
• CPC Class Codes: H03M 13/2909 Product codes
• CPC Class Codes: H03M 13/2915 with an error detection code in one dimension
• CPC Class Codes: H03M 13/2918 with error correction codes in three or more dimensions, e.g. 3-dimensional product code where the bits are arranged in a cube
• CPC Class Codes: H03M 13/2927 Decoding strategies
• CPC Class Codes: H03M 13/293 with erasure setting
• CPC Class Codes: H03M 13/2933 using a block and a convolutional code H03M13/2957 takes precedence
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H03M 13/3723 using means or methods for the initialisation of the decoder
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• 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 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• 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 DTV transmitting system includes a frame encoder, a randomizer, a block processor, a group formatter, a deinterleaver, and a packet formatter. The frame encoder builds an enhanced data frame and adds parity data into the data frame. The frame encoder further divides the data frame into first and second sub-frames including first and second portions of the parity data, respectively, and permutes a plurality of the first sub-frames and a plurality of the second sub-frames, respectively. The randomizer randomizes enhanced data in the permuted sub-frames, and the block processor codes the randomized data at a rate of 1/N1. The group formatter forms a group of enhanced data having one or more data regions and inserts the 1/N1 coded data into at least one of the data regions. The deinterleaver deiniterleaves the group of enhanced data, and the packet formatter formats the deinterleaved data into enhanced data packets.

Claims

1. A DTV transmitting system for processing broadcast data, the DTV transmitting system comprising:

a frame encoder configured to build an enhanced data frame, to encode the enhanced data frame for error correction by adding parity data, to divide the encoded data frame into first and second sub-frames including first and second portions of the parity data, respectively, and to permute a plurality of the first sub-frames and a plurality of the second sub-frames, respectively;

a randomizer configured to randomize enhanced data in the permuted sub-frames;

a block processor configured to code the randomized enhanced data at an effective coding rate of 1/N1;

a group formatter configured to form a group of enhanced data having one or more data regions and inserting the enhanced data coded at the effective coding rate of 1/N1 into at least one of the data regions;

a deinterleaver configured to deinterleave the group of enhanced data; and

a packet formatter configured to format the deinterleaved enhanced data into enhanced data packets.

2. The DTV transmitting system of claim 1, wherein the frame encoder encodes the enhanced data frame row by row and further encodes the enhanced data frame column by column.

3. The DTV transmitting system of claim 1, wherein the frame encoder encodes the enhanced data frame column by column and further encodes the enhanced data frame row by row.

4. The DTV transmitting system of claim 1, wherein the frame encoder encodes the enhanced data frame column by column.

5. The DTV transmitting system of claim 1, wherein the frame encoder encodes the enhanced data frame row by row.

6. The DTV transmitting system of claim 1, wherein the first sub-frame includes the first portion of the parity data and payload data.

7. The DTV transmitting system of claim 1, wherein the group of enhanced data has head, body, and tail regions, and the group formatter inserts the first portion of the parity data and the enhanced data coded at the effective coding rate of 1/N1 into the body region.

8. The DTV transmitting system of claim 7, wherein the group formatter inserts the second portion of the parity data into at least one of the head and tail regions.

9. The DTV transmitting system of claim 1, further comprising a packet multiplexer configured to multiplex the enhanced data packets with main data packets.

10. The DTV transmitting system of claim 1, wherein the frame encoder permutes the plurality of first sub-frames and the plurality of second sub-frames row by row, respectively.

20. The method of claim 1, wherein the plurality of first sub-frames and the plurality of second sub-frames are permuted row by row.

11. A method of processing broadcast data in a DTV transmitting system, the method comprising:

building an enhanced data frame, encoding the enhanced data frame for error correction by adding parity data, dividing the encoded data frame into first and second sub-frames including first and second portions of the parity data, respectively, and permuting a plurality of the first sub-frames and a plurality of second sub-frames, respectively;

randomizing enhanced data in the permuted sub-frames;

coding the randomized enhanced data at an effective rate of 1/N1;

forming a group of enhanced data having one or more data regions and inserting the enhanced data coded at the effective rate of 1/N1 into at least one of the data regions;

deinterleaving the group of enhanced data; and

formatting the deinterleaved enhanced data into enhanced data packets.

12. The method of claim 11, wherein the enhanced data frame is encoded row by row and is further encoded column by column.

13. The method of claim 11, wherein the enhanced data frame is encoded column by column and is further encoded row by row.

14. The method of claim 11, wherein the enhanced data frame is encoded column by column.

15. The method of claim 11, wherein the enhanced data frame is encoded row by row.

16. The method of claim 11, wherein the first sub-frame includes the first portion of the parity data and payload data.

17. The method of claim 11, wherein the group of enhanced data has head, body, and tail regions, and the first portion of the parity data and the enhanced data coded at the effective coding rate of 1/N1 are inserted into the body region.

18. The method of claim 17, wherein the second portion of the parity data is inserted into at least one of the head and tail regions.

19. The method of claim 11, further comprising multiplexing the enhanced data packets with main data packets.

21. A DTV receiving system for processing broadcast data, the DTV receiving system comprising:

a tuner configured to receive a digital broadcast signal including enhanced and main data;

a demodulator configured to demodulate the digital broadcast signal;

an equalizer configured to compensate channel distortion of the demodulated signal;

a block decoder configured to decode each block of enhanced data in the channel-equalized signal;

a data deformatter configured to deformat the decoded enhanced data and to derandomize the deformatted enhanced data; and

a frame decoder configured to form a group of first sub-frames and a group of second sub-frames and to perform reverse permutation on the group of first sub-frames and the group of second sub-frames, respectively, each first sub-frame including the derandomized enhanced data and first parity data, each second sub-frame including second parity data,

wherein the frame decoder is further configured to form an enhanced data frame by combining each first sub-frame and each second sub-frame and to decode the enhanced data frame for error correction.

22. The DTV receiving system of claim 21, wherein the frame decoder decodes the enhanced data frame row by row and further decodes the enhanced data frame column by column.

23. The DTV receiving system of claim 21, wherein the frame decoder decodes the enhanced data frame column by column and further decodes the enhanced data frame row by row,

24. The DTV receiving system of claim 21, wherein the frame decoder decodes the enhanced data frame column by column.

25. The DTV receiving system of claim 21, wherein the frame decoder decodes the enhanced data frame row by row.

26. The DTV receiving system of claim 21, wherein the frame decoder is a Reed-Solomon (RS) decoder which removes the first and second parity data from the enhanced data frame.

27. The DTV receiving system of claim 21, wherein the frame decoder performs reverse permutation on the group of first sub-frames and the group of second sub-frames row by row.

28. A method of processing broadcast data in a DTV receiving system, the method comprising:

tuning to a channel to receive a digital broadcast signal including enhanced and main data;

demodulating the digital broadcast signal;

compensating channel distortion of the demodulated signal;

decoding each block of enhanced data in the channel equalized signal;

deformatting the decoded enhanced data and derandomizing the deformatted enhanced data;

forming a group of first sub-frames and a group of second sub-frames and performing reverse permutation on the group of first sub-frames and the group of second sub-frames, each first sub-frame including the derandomized enhanced data and first parity data, each second sub-frame including second parity data; and

forming an enhanced data frame by combining each first sub-frame and each second sub-frame and decoding the enhanced data frame for error correction.

29. The method of claim 28, wherein the enhanced data frame is decoded row by row and is further decoded column by column,

30. The method of claim 28, wherein the enhanced data frame is decoded column by column and is further decoded row by row.

31. The method of claim 28, wherein the enhanced data frame is decoded column by column.

32. The method of claim 28, wherein the enhanced data frame is decoded row by row.

33. The method of claim 28, wherein decoding the enhanced data frame for error correction comprises removing the first and second parity data from the enhanced data frame.

34. The method of claim 28, wherein the group of first sub-frames and the group of second sub-frames are performed reverse permutation row by row.