Broadcasting receiver and broadcast signal processing method

• US 8,014,332 B2
• Filed: 07/02/2008
• Issued: 09/06/2011
• Est. Priority Date: 07/02/2007
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Byoung Gill, Lee, Hyoung Gon, Choi, In Hwan, Song, Won Gyu, Kwak, Kook Yeon, Kim, Jin Woo, Oh, Hyen O
• Primary Examiner(s): PHAM, BRENDA H
• Application Number:
  US12/167,232
• Publication Number:
  US 20090040997A1
• Time in Patent Office: 1,161 Days
• Field of Search: 370/313, 370/312, 375/136, 375/147, 375/316
• US Class Current: 370/312
• CPC Class Codes: H03M 13/2792 Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
• CPC Class Codes: H03M 13/2906 using block codes H03M13/2957 takes precedence
• CPC Class Codes: H04H 20/71 Wireless systems
• 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 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder
• CPC Class Codes: H04N 21/2365 Multiplexing of several video streams
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• 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 digital broadcasting system which is robust against an error when mobile service data is transmitted and a method of processing data are disclosed. The mobile service data is subjected to an additional coding process and the coded mobile service data is transmitted. Accordingly, it is possible to cope with a serious channel variation while applying robustness to the mobile service data.

Claims

1. A broadcasting receiver comprising:

a receiver which receives a broadcast signal including mobile service data and main service data,

in which the mobile service data is able to construct a data group, the data group is divided into several areas, N number of known data streams are inserted into some areas from among the several areas, and a transmission parameter is inserted between a first known data stream and a second known data stream from among the N number of known data streams;

a transmission parameter detector for detecting the transmission parameter;

a block decoder for performing block-unit symbol-decoding of the mobile service data contained in the received broadcast signal on the basis of the detected transmission parameter; and

a decoder for extracting audio data and additional information from the symbol-decoded mobile service data, dequantizing the audio data, converting the dequantized audio data into a time-domain signal for each block according to a length of a block indicated by an identifier contained in the additional information, and restoring an audio signal.

2. The broadcasting receiver according to claim 1, wherein the known data stream is linearly inserted into some areas of the several areas, and initialization data for initializing a memory contained in a Trellis encoder of a transmitter is located at a start part of the known data stream.

3. The broadcasting receiver according to claim 1, wherein the mobile service data is able to construct a RS frame, in which the RS frame includes at least one data packet of the mobile service data, a RS parity generated on the basis of the at least one data packet, a CRC checksum generated on the basis of the at least one data packet and the RS parity.

4. The broadcasting receiver according to claim 1, wherein the audio data is converted from a time-domain signal to a frequency-domain signal on the basis of a block unit which has different lengths according to audio-signal characteristics.

5. The broadcasting receiver according to claim 1, wherein the decoder performs an overlapping process such that it converts the dequantized audio data into the time-domain signal.

6. The broadcasting receiver according to claim 5, wherein the decoder performs an inverse modified discrete cosine transform (IMDCT), and converts the dequantized audio data into the time-domain signal.

7. The broadcasting receiver according to claim 1, wherein the decoder performs an inverse polyphase filterbank process, such that it converts the dequantized audio data into the time-domain signal.

8. The broadcasting receiver according to claim 1, wherein the decoder includes:

a demultiplexing and errorcheck unit for extracting the audio data and the additional information from the symbol-decoded mobile service data;

a Huffman decoding unit for dequantizing the audio data;

a descaling unit for descaling the dequantized audio data; and

an inverse modified discrete cosine transform (IMDCT) unit for converting the descaled audio data into the time-domain signal for each block according to a length of a block indicated by the identifier contained in the additional information.

9. A method for processing a broadcast signal comprising:

a) receiving a broadcast signal including mobile service data and main service data;

b) detecting a transmission parameter from the broadcast signal;

c) performing block-unit symbol-decoding of the mobile service data contained in the received broadcast signal on the basis of the detected transmission parameter; and

d) extracting audio data and additional information from the symbol-decoded mobile service data, dequantizing the audio data, converting the dequantized audio data into a time-domain signal for each block according to a length of a block indicated by an identifier contained in the additional information, and restoring an audio signal, in which the mobile service data is able to construct a data group, the data group is divided into several areas, N number of known data streams are inserted into some areas from among the several areas, and a transmission parameter is inserted between a first known data stream and a second known data stream from among the N number of known data streams.

10. The method according to claim 9, wherein the known data stream is linearly inserted into some areas of the several areas, and initialization data for initializing a memory contained in a Trellis encoder of a transmitter is located at a start part of the known data stream.

11. The method according to claim 9, wherein the mobile service data is able to construct a RS frame, in which the RS frame includes at least one data packet of the mobile service data, a RS parity generated on the basis of the at least one data packet, a CRC checksum generated on the basis of the at least one data packet and the RS parity.

12. The method according to claim 9, wherein the audio data is converted from a time-domain signal to a frequency-domain signal on the basis of a block unit which has different lengths according to audio-signal characteristics.

13. The method according to claim 9, wherein the restoring step of the audio signal performs an overlapping process the dequantized audio data is converted into the time-domain signal.

14. The method according to claim 13, wherein the restoring step of the audio signal performs an inverse modified discrete cosine transform (IMDCT), and converts the dequantized audio data into the time-domain signal.

15. The method according to claim 9, wherein the restoring step of the audio signal performs an inverse polyphase filterbank process, converts the dequantized audio data into the time-domain signal, and restores the audio signal.