Digital broadcasting system and data processing method

• US 8,102,921 B2
• Filed: 07/02/2008
• Issued: 01/24/2012
• Est. Priority Date: 07/02/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Suh, Jong Yeul, Choi, In Hwan, Hong, Ho Taek, Kwak, Kook Yeon, Kim, Byoung Gill, Song, Jae Hyung, Kim, Jin Pil, Song, Won Gyu, Lee, Chul Soo, Kim, Jin Woo, Lee, Hyoung Gon, Lee, Joon Hui
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): LIU, BEN H
• Application Number:
  US12/167,226
• Publication Number:
  US 20090028247A1
• Time in Patent Office: 1,301 Days
• Field of Search: 375/265, 714/758, 725/54
• US Class Current: 375/240.27
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 20/57 for mobile receivers
• CPC Class Codes: H04H 40/27 specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
• 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 21/4382 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

The present invention provides a method of processing data in digital broadcasting system. The method includes receiving a broadcast signal including mobile broadcast service data and main broadcast service data, wherein the mobile broadcast service data configures a data group, wherein the data group is divided into a plurality of regions, wherein known data sequences are linearly inserted in some regions among the plurality of regions, and wherein initialization data are inserted at a beginning portion of each known data sequence, the initialization data being used for initializing a memory included in a trellis encoder of a digital broadcast transmitting system, detecting known data included in the received broadcast signal, channel-equalizing the received mobile broadcast service data corresponding to the detected known data, using the detected known data, extracting a video data from the mobile broadcast service data, parsing the extracted video data by a NAL unit and decoding the parsed video data based on header information of the parsed NAL unit.

Claims

1. A method of receiving a broadcast signal in a receiver, the method comprising:

receiving a broadcast signal including a transmission frame, wherein a parade of data groups in the broadcast signal is received during slots within the transmission frame, the slots being basic time periods for multiplexing of mobile data and main data, and each of the data groups includes the mobile data, signaling information and known data sequences;

demodulating the broadcast signal and obtaining, from the signaling information, fast information channel (FIC) data having cross layer information between a physical layer and an upper layer, and transmission parameter channel (TPC) data having an identifier of the parade and version information of the FIC data;

building a Reed-Solomon (RS) frame corresponding to an ensemble of a service of the mobile data by;

collecting a plurality of data portions which are mapped to the data groups, the RS frame being a 2-dimensional data frame through which the mobile data belonging to the ensemble is RS-cyclic redundancy check (RS-CRC) encoded,

performing error detection on the RS frame, and

performing error correction on data in the RS frame;

extracting video data from the mobile data;

parsing the extracted video data by a network abstraction layer (NAL) unit; and

decoding the parsed video data based on header information of the parsed NAL unit.

2. The method of claim 1, further comprising:

detecting a transmission parameter from the mobile data; and

symbol-decoding the mobile data included in the received broadcast signal in block units based upon the detected transmission parameter,

wherein the transmission parameter is inserted between the known data sequences.

3. The method of claim 1, wherein extracting the video data from the mobile data comprises obtaining data identification information for identifying a type of the mobile data, wherein the video data is extracted based on the data identification information.

4. The method of claim 1, wherein decoding the parsed video data comprises:

obtaining a first prediction image of ½

pixel unit using a 6-tap filter, and obtaining a second prediction image of ¼

pixel unit using an average filter; and

reconstructing a target image using the second prediction image.

5. The method of claim 4, wherein obtaining the first prediction image comprises performing weighted prediction based on slice type information and weighted prediction mode identification information.

6. The method of claim 4, wherein obtaining the first prediction image and obtaining the second prediction image comprises:

predicting a target macroblock within the target image using at least one reference image, wherein the target macroblock corresponds to one of a 16×

16 macroblock, a 16×

8 macroblock, an 8×

16 macroblock, an 8×

8 macroblock, an 8×

4 macroblock and a 4×

4 macroblock.

7. An apparatus for receiving a broadcast signal, the apparatus comprising:

a tuner configured to receive a broadcast signal including a transmission frame, wherein a parade of data groups in the broadcast signal is received during slots within the transmission frame, the slots being basic time periods for multiplexing of mobile data and main data, and each of the data groups includes the mobile data, signaling information and known data sequences;

a demodulator configured to demodulate the broadcast signal and obtain, from the signaling information, fast information channel (FIC) data having cross layer information between a physical layer and an upper layer and transmission parameter channel (TPC) data having an identifier of the parade and version number of the FIC data;

a Reed Solomon (RS) frame decoder configured to build an RS frame corresponding to an ensemble of a service of the mobile data by;

collecting a plurality of data portions which are mapped to the data groups, the RS frame being a 2-dimensional data frame through which the mobile data belonging to the ensemble are RS- cyclic redundancy check (RS-CRC) encoded,

performing error detection on the RS frame, and

performing error correction on data in the RS frame;

a demultiplexing unit configured to extract a video data from the mobile data;

a network abstraction layer (NAL) parsing unit configured to parse the extracted video data by an NAL unit; and

a video data decoding unit decoding the parsed video data based on header information of the parsed NAL unit.

8. The apparatus of claim 7, further comprising:

a transmission parameter detector configured to detect a transmission parameter from the mobile data; and

a block decoder configured to symbol-decode the mobile data included in the received broadcast signal in block units based upon the detected transmission parameter,

wherein the transmission parameter is inserted between the known data sequences.

9. The apparatus of claim 7, wherein the demultiplexing unit extracts the parsed video data based on data identification information obtained from the broadcast signal and wherein the data identification information identifies a type of the mobile data.

10. The apparatus of claim 7, wherein the video data decoding unit comprises:

an inter-prediction unit obtaining a first prediction image of ½

pixel unit using a 6-tap filter, and obtaining a second prediction image of ¼

pixel unit using a average filter; and

an image reconstructing unit reconstructing a target image using the second prediction image.

11. The apparatus of claim 10, wherein the inter-prediction unit includes a weighted prediction unit performing weighted prediction based on slice type information and weighted prediction mode identification information.

12. The apparatus of claim 10, wherein the inter-prediction unit predicts a target macroblock within the target image using at least one reference image and wherein the target macroblock corresponds to one of a 16×

16 macroblock, a 16×

8 macroblock, an 8×

16 macroblock, an 8×

8 macroblock, an 8×

4 macroblock and a 4×

4 macroblock.