BROADCASTING RECEIVER AND BROADCAST SINGNAL PROCESSING METHOD

• US 20090044231A1
• Filed: 07/02/2008
• Published: 02/12/2009
• Est. Priority Date: 07/02/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Byoung Gill, Lee, Hyoung Gon, Choi, In Hwan, Oh, Hyen O., Song, Won Gyu, Kwak, Kook Yeon, Kim, Jin Woo
• Granted Patent: US 8,023,525 B2
• Time in Patent Office: Days
• US Class Current: 725/62
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/271 Row-column interleaver with permutations, e.g. block interleaving with inter-row, inter-column, intra-row or intra-column permutations
• CPC Class Codes: H03M 13/2909 Product codes
• CPC Class Codes: H03M 13/293 with erasure setting
• CPC Class Codes: H03M 13/2966 Turbo codes concatenated with another code, e.g. an outer block code
• CPC Class Codes: H03M 13/2972 Serial concatenation using convolutional component codes
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04L 1/0048 in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder for spatial equalizer H04L25/03286
• 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: H04L 2001/0093 Point-to-multipoint
• 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 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• 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 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4381 Recovering the multiplex stream from a specific network, e.g. recovering MPEG packets from ATM cells transmission of MPEG streams over ATM H04L12/5601
• 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
• CPC Class Codes: H04N 21/6131 : involving transmission via a mobile phone network wireless downlink channel access H04W74/006

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, and a transmission parameter is inserted into some areas from among the several areas;

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 transmission parameter;

a RS frame decoder for constructing a RS frame on the basis of the symbol-decoded mobile service data, performing a RS decoding on the basis of the transmission parameter, and correcting errors generated in the mobile service data, 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, and a CRC checksum generated on the basis of the at least one data packet and the RS parity;

a derandomizer for derandomizing the RS-decoded mobile service data; and

a decoder for extracting a parameter from audio stream included in the derandomized mobile service data, decoding the extracted parameter, and restoring an audio signal of an extended area.

2. The broadcasting receiver according to claim 1, wherein known data streams are linearly inserted into some of the plurality of regions, and initialization data used for initializing a memory in a trellis encoder of a transmitter is located at a start portion of the known data stream.

3. The broadcasting receiver according to claim 1, wherein N known data streams are inserted into some of the plurality of regions and a transfer parameter is inserted between a first known data stream and a second known data stream among the N known data streams.

4. The broadcasting receiver according to claim 1, wherein, if the parameter includes a spectral band replication (SBR), the decoder additionally decodes the recovered audio signal, such that it recovers an audio signal of a high-frequency area of a mono-channel.

5. The broadcasting receiver according to claim 1, wherein, if the parameter includes spectral band replication (SBR) and parametric stereo (PS) information, the decoder additionally decodes the recovered audio signal, such that an audio signal of the high-frequency area of the mono-channel, an audio signal of a low-frequency area of a stereo-channel, and an audio signal of the high-frequency area are recovered.

6. The broadcasting receiver according to claim 1, wherein,

a bit demultiplexer for extracting a parameter from audio stream included in the derandomized mobile service data;

an Advanced Audio Coding (AAC) decoder for decoding the audio data on the basis of Huffman table information and area division information contained in the parameter, dequantizing the decoded audio data, and restoring an audio signal; and

a Spectral Band Replication (SBR) decoder for additionally decoding the restored audio signal on the basis of additional expansion information contained in the parameter, and restoring the audio signal of the expansion area.

7. The broadcast receiver according to claim 1, wherein the decoder decodes the parameter according to the the Algebraic Code Excited Linear Prediction (ACELP) and Transform Coded Excitation (TCX), and restoring the audio signal of the expansion area.

8. A method for processing a broadcast signal comprising:

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

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

constructing a RS frame on the basis of the symbol-decoded mobile service data, performing a RS decoding on the basis of the transmission parameter, and correcting errors generated in the mobile service data;

derandomizing the RS-decoded mobile service data; and

extracting a parameter from audio stream included in the derandomized mobile service data, decoding the extracted parameter, and restoring an audio signal of an extended area,

in which the mobile service data is able to construct a data group, the data group is divided into several areas, a transmission parameter is inserted into some areas from among the several areas, and 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, and a CRC checksum generated on the basis of the at least one data packet and the RS parity.

9. The method according to claim 8, wherein known data streams are linearly inserted into some of the plurality of regions, and initialization data used for initializing a memory in a trellis encoder of a transmitter is located at a start portion of the known data stream.

10. The method according to claim 8, wherein N known data streams are inserted into some of the plurality of regions and a transfer parameter is inserted between a first known data stream and a second known data stream among the N known data streams.

11. The method according to claim 8, wherein the restoring step of the audio signal includes:

if the parameter includes a spectral band replication (SBR), additionally decoding the recovered audio signal, such that it recovers an audio signal of a high-frequency area of a mono-channel.

12. The method according to claim 8, wherein the restoring step of the audio signal includes:

if the parameter includes parametric stereo (PS) information, additionally decoding the recovered audio signal, such that an audio signal of a high-frequency area of a mono-channel, an audio signal of a low-frequency area of a stereo-channel, and an audio signal of the high-frequency area are recovered.

13. The method according to claim 8, wherein the recovering step of the audio signal includes:

extracting a parameter from audio stream included in the derandomized mobile service data;

decoding the audio data on the basis of Huffman table information and area division information contained in the parameter, dequantizing the decoded audio data, and restoring an audio signal; and

additionally decoding the recovered audio signal on the basis of additional expansion information contained in the additional information, and restoring the audio signal of the expansion area.

14. The method according to claim 8, wherein the recovering step of the audio signal decodes the parameter according to the Algebraic Code Excited Linear Prediction (ACELP) and Transform Coded Excitation (TCX), and restoring the audio signal of the expansion area.