BROADCASTING RECEIVER AND BROADCAST SIGNAL PROCESSING METHOD

• US 20090046815A1
• Filed: 07/02/2008
• Published: 02/19/2009
• 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 7,995,511 B2
• Time in Patent Office: Days
• US Class Current: 375/340
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 20/57 for mobile receivers
• CPC Class Codes: H04H 20/95 characterised by a specific format, e.g. an encoded audio stream
• CPC Class Codes: H04H 40/27 specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
• 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 21/42607 for processing the incoming bitstream
• 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 power-supply controller for controlling a power-supply voltage using the detected transmission parameter such that it receives a data group including desired mobile service data to be received; and

a decoder for extracting audio data from an audio stream contained in the mobile service data, dequantizing the audio data, and restoring a stereo audio signal on the basis of mid data and side data contained in the dequantized audio data.

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, and 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 mid data is generated by using the sum of a right-channel signal and a left-channel signal of the stereo audio signal.

5. The broadcasting receiver according to claim 1, wherein the side data is generated by using a difference between a right-channel signal and a left-channel signal of the stereo audio signal.

6. A method for processing a broadcast signal comprising:

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

b) detecting a transmission parameter from the received broadcast signal;

c) controlling a power-supply voltage using the detected transmission parameter such that it receives a data group including desired mobile service data to be received; and

d) extracting audio data from an audio stream contained in the mobile service data, dequantizing the audio data, and restoring a stereo audio signal on the basis of mid data and side data contained in the dequantized audio 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.

7. The method according to claim 6, 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.

8. The method according to claim 6, 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, and a CRC checksum generated on the basis of the at least one data packet and the RS parity.

9. 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 power-supply controller for controlling a power-supply voltage using the detected transmission parameter such that it receives a data group including desired mobile service data to be received; and

a decoder for extracting an audio parameter from an audio stream contained in the mobile service data, calculating sub-frame number information indicating the number of sub-frames contained in the audio stream on the basis of the extracted audio parameter, calculating start position information of each sub-frame on the basis of the calculated sub-frame number information, detecting the sub-frame from the audio stream on the basis of the calculated start position information, and decoding audio data contained in the sub-frame.

10. The broadcasting receiver 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 broadcasting receiver 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, and a CRC checksum generated on the basis of the at least one data packet and the RS parity.

12. The broadcasting receiver according to claim 9, wherein the audio parameter includes at least one of sampling-rate information, spectral band replication (SBR) used or unused information, channel mode information, parametric stereo (PS) used or unused information, and MPEG surround configuration information.

13. The broadcasting receiver according to claim 12, wherein the decoder calculates the sub-frame number information on the basis of the sampling-rate information and the SBR used or unused information.

14. The broadcasting receiver according to claim 9, wherein, the decoder, if the refresh information indicating a change of an audio-stream processing scheme from the audio stream, changes the audio-stream processing scheme according to the refresh information.

15. The broadcasting receiver according to claim 14, wherein the refresh information includes:

refreshpoint flag (RPF) information indicating that a refresh can be conducted; and

additional information indicating the audio-stream processing scheme.