Broadcasting receiver and broadcast signal processing method

• US 8,085,751 B2
• Filed: 07/02/2008
• Issued: 12/27/2011
• Est. Priority Date: 07/02/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Oh, Hyen O, Choi, In Hwan, Kwak, Kook Yeon, Kim, Byoung Gill, Song, Won Gyu, Kim, Jin Woo, Lee, Hyoung Gon
• Primary Examiner(s): Harper, Kevin C
• Assistant Examiner(s): MURPHY, RHONDA L
• Application Number:
  US12/167,230
• Publication Number:
  US 20090044230A1
• Time in Patent Office: 1,273 Days
• Field of Search: None
• US Class Current: 370/345
• 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 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• 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 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. An apparatus for receiving a broadcast signal, the apparatus comprising:

a receiver configured to receive the broadcast signal including a transmission frame comprising data groups,

wherein each data group includes mobile service data, known data sequences, and signaling data comprising transmission parameters for signaling the mobile service data,

wherein the data groups are transmitted during slots,

wherein each of the slots is a time period for multiplexing the mobile service data and a main service data,

wherein sixteen slots are included in a sub frame and five sub frames are included in the transmission frame, and

wherein a first portion of the transmission parameters includes signaling data for a current transmission frame and a second portion of the transmission parameters includes signaling data for a next transmission frame;

a known data detector configured to detect at least one of the known data sequences in the received broadcast signal;

an equalizer configured to channel-equalize the received mobile service data using at least one of the known data sequences; and

a decoder configured to extract audio data and scale factor index information from the channel-equalized mobile service data and inversely scale the extracted audio data on the basis of a scale factor indicated by the scale factor index information to restore an audio signal.

2. The apparatus of claim 1, wherein each data group includes a plurality of regions comprising data blocks,

wherein the known data sequences are inserted into specific regions of the plurality of regions and the signaling data is inserted between a first known data sequence and a second known data sequence among the known data sequences.

3. The apparatus of claim 1, wherein the mobile service data configures a Reed-Solomon (RS) frame, and the RS frame is a two-dimensional data frame through which the mobile service data is RS and Cyclic-Redundancy-Check (CRC) encoded.

4. A method for receiving a broadcast signal, the method comprising:

receiving the broadcast signal including a transmission frame comprising data groups,

wherein each data group includes mobile service data, known data sequences, and signaling data having transmission parameters for signaling the mobile service data,

wherein the data groups are transmitted during slots,

wherein each of the slots is a time period for multiplexing the mobile service data and a main service data,

wherein sixteen slots are included in a sub frame and five sub frames are included in the transmission frame, and

wherein a first portion of the transmission parameters includes signaling data for a current transmission frame and a second portion of the transmission parameters includes signaling data for a next transmission frame;

detecting at least one of the known data sequences in the received broadcast signal;

channel-equalizing the received mobile service data using at least one of the known data sequences; and

extracting audio data and scale factor index information from the channel-equalized mobile service data and inversely scaling the extracted audio data according to a scale factor indicated by the scale factor index information to restore an audio signal.

5. The method of claim 4, wherein each data group includes a plurality of regions comprising data blocks, and

wherein the known data sequences are inserted into specific regions of the plurality of regions and the signaling data is inserted between a first known data sequence and a second known data sequence among the known data sequences.

6. The method of claim 4, wherein the mobile service data configures a Reed-Solomon (RS) frame, and the RS frame is a two-dimensional data frame through which the mobile service data is RS and Cyclic-Redundancy-Check (CRC) encoded.

7. An apparatus for transmitting a digital broadcast signal including mobile service data, the apparatus comprising:

a Reed-Solomon (RS) encoder configured to build one or two RS frames,

wherein the RS frame is a two-dimensional data frame through which the mobile service data is RS and Cyclic-Redundancy-Check (CRC) encoded;

a divider configured to divide the built one or two RS frames into a plurality of RS frame portions, such that each of the RS frame portions has a size of PL bytes,

wherein the PL is an integer;

a signaling encoder configured to encode signaling data including transmission parameters for signaling the mobile service data;

a group formatter configured to form data groups, such that data group includes data of each of the plurality of RS frame portions and the encoded signaling data;

a packet formatter configured to form mobile service data packets including data in the formed data groups;

a multiplexer configured to multiplex the mobile service data packets with main service data packets including main service data; and

a transmission unit configured to transmit the digital broadcast signal including the multiplexed mobile service data packets and main service data packets;

wherein the data groups are transmitted during slots,

wherein each of the slots is a time period for multiplexing the mobile service data and the main service data,

wherein sixteen slots are included in a sub frame and five sub frames are included in a transmission frame,

wherein a first portion of the transmission parameters includes signaling data for a current transmission frame and a second portion of the transmission parameters includes signaling data for a next transmission frame, and

wherein each data group includes audio data coded according to a scale factor indicated by scale factor index information.

8. The apparatus of claim 7, wherein each data group includes a plurality of regions comprising data blocks, and

wherein the known data sequences are inserted into specific regions of the plurality of regions and the signaling data is inserted between a first known data sequence and a second known data sequence.

9. A method for transmitting a digital broadcast signal including mobile service data, the method comprising:

building one or two Reed-Solomon (RS) frames,

wherein the RS frame is a two-dimensional data frame through which the mobile service data is RS and Cyclic-Redundancy-Check (CRC) encoded;

dividing the built one or two RS frames into a plurality of RS frame portions, such that each of the RS frame portions has size of PL bytes,

wherein the PL is an integer;

encoding signaling data including transmission parameters for signaling the mobile service data;

forming data groups, such that each data group includes data of each of the plurality of RS frame portions and the encoded signaling data;

forming mobile service data packets including data in the formed data groups;

multiplexing the mobile service data packets with main service data packets including main service data; and

transmitting the digital broadcast signal including the multiplexed mobile service data packets and main service data packets;

wherein the data groups are transmitted during slots,

wherein each of the slots is a time period for multiplexing the mobile service data and the main service data,

wherein sixteen slots are included in a sub frame and five sub frames are included in a transmission frame,

wherein a first portion of the transmission parameters includes signaling data for a current transmission frame and a second portion of the transmission parameters includes signaling data for a next transmission frame, and

wherein each data group includes audio data coded on the basis of a scale factor indicated by scale factor index information.

10. The method of claim 9, wherein each data group includes a plurality of regions and the plurality of regions include data blocks, and

wherein the known data sequences are inserted into specific regions of the plurality of regions and the signaling data is inserted between a first known data sequence and a second known data sequence.