DIGITAL BROADCASTING SYSTEM AND DATA PROCESSING METHOD

• US 20090037959A1
• Filed: 07/02/2008
• Published: 02/05/2009
• 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, Suh, Jong Yeul, Lee, Hyoung Gon, Hong, Ho Taek, Choi, In Hwan, Lee, Chul Soo, Kim, Jin Pil, Song, Jae Hyung, Song, Won Gyu, Kwak, Kook Yeon, Kim, Jin Woo, Lee, Joon Hui
• Granted Patent: US 8,098,740 B2
• Time in Patent Office: Days
• US Class Current: 725/62
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer
• CPC Class Codes: H04N 19/31 in the temporal domain
• 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 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder
• 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 21/4345 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
• CPC Class Codes: H04N 21/8451 using Advanced Video Coding [AVC]

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 N number of known data sequences are inserted in some regions among the plurality of regions, and wherein a transmission parameter is inserted between a first known data sequence and a second known data sequence, among the N number of known data sequences, detecting the transmission parameter from the mobile broadcast service data, symbol-decoding the received broadcast signal included in the mobile broadcast service data in block units, based upon the detected transmission parameter, extracting a video data from the mobile broadcast service data, parsing the extracted video data by a NAL unit, obtaining NAL unit type information from parsed NAL header, obtaining extension information of a NAL header, when data of a current NAL unit indicates scalable video coded data according to the NAL unit type information, and decoding the video data using the extension information of the NAL header, wherein the extension information of the NAL header includes at least one of temporal level information, quality level information, information indicating whether inter-layer prediction is used, and dependency information of the NAL unit.

Claims

1. A method of processing data, comprising:

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 N number of known data sequences are inserted in some regions among the plurality of regions, and wherein a transmission parameter is inserted between a first known data sequence and a second known data sequence, among the N number of known data sequences;

detecting the transmission parameter from the mobile broadcast service data;

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

extracting a video data from the mobile broadcast service data;

parsing the extracted video data by a NAL unit;

obtaining NAL unit type information from parsed NAL header;

obtaining extension information of a NAL header, when data of a current NAL unit indicates scalable video coded data according to the NAL unit type information; and

decoding the video data using the extension information of the NAL header,

wherein the extension information of the NAL header includes at least one of temporal level information, quality level information, information indicating whether inter-layer prediction is used, and dependency information of the NAL unit.

2. The method of claim 1, further comprising:

controlling power based upon the detected transmission parameter, thereby receiving a data group including requested mobile broadcast service data.

3. The method of claim 1, further comprising:

configuring an RS frame with the symbol-decoded mobile broadcast service data, and performing RS-decoding based upon the transmission parameter, thereby correcting errors occurred in the corresponding mobile broadcast service data,

derandomizing the RS-decoded mobile broadcast service data.

4. The method of claim 1,

wherein when decoding the video data, pictures in the same access unit have the same temporal level information.

5. The method of claim 1, the video data decoding step comprising:

predicting a target image using a reference image; and

reconstructing the target image using the predicted image,

wherein temporal level information of the reference image is equal to or lower than that of the target image.

6. The method of claim 5, the predicting step comprising performing weighted prediction based on slice type information and weighted prediction mode identification information.

7. The method of claim 5,

wherein the temporal level information is obtained from an extension area of the NAL header,

in the predicting step, a target macroblock within the target image is predicted using at least one reference image and wherein the target macroblock corresponding to one of 16×

16 macroblock, 16×

8 macroblock, 8×

16 macroblock, 8×

8 macroblock, 8×

4 macroblock and 4×

4 macroblock.

8. A digital broadcast system comprising:

a receiver 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 N number of known data sequences are inserted in some regions among the plurality of regions, and wherein a transmission parameter is inserted between a first known data sequence and a second known data sequence, among the N number of known data sequences;

a transmission parameter detector detecting the transmission parameter from the mobile broadcast service data;

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

a demultiplexing unit extracting a video data from the mobile broadcast service data;

a NAL parsing unit parsing the extracted video data by a NAL unit;

a NAL unit decoding unit, obtaining NAL unit type information from parsed NAL header, and obtaining extension information of a NAL header, when data of a current NAL unit indicates scalable video coded data according to the NAL unit type information; and

a video data decoding unit decoding the video data using the extension information of the NAL header,

wherein the extension information of the NAL header includes at least one of temporal level information, quality level information, information indicating whether inter-layer prediction is used, and dependency information of the NAL unit.

9. The digital broadcast system of claim 8, further comprising:

a power controller controlling power based upon the detected transmission parameter, thereby receiving a data group including requested mobile broadcast service data.

10. The digital broadcast system of claim 8, further comprising:

a RS frame decoder configuring an RS frame with the symbol-decoded mobile broadcast service data, and performing RS-decoding based upon the transmission parameter, thereby correcting errors occurred in the corresponding mobile broadcast service data,

a derandomaizer derandomizing the RS-decoded mobile broadcast service data.

11. The digital broadcast system of claim 8,

wherein when decoding the video data, pictures in the same access unit have the same temporal level information.

12. The digital broadcast system of claim 8, the video data decoding unit comprising:

an inter-prediction unit predicting a target image using a reference image; and

an image reconstructing unit reconstructing the target image using the predicted image,

wherein temporal level information of the reference image is equal to or lower than that of the target image.

13. The digital broadcast system of claim 12,

the inter-prediction unit comprising a weighted prediction unit performing weighted prediction based on slice type information and weighted prediction mode identification information.

14. The digital broadcast system of claim 12,

wherein the temporal level information is obtained from an extension area of the NAL header,

wherein for the motion compensation, the inter-prediction unit predicts a target macroblock in the target image using at least one reference image, the target macroblock corresponding to one of 16×

16 macroblock, 16×

8 macroblock, 8×

16 macroblock, 8×

8 macroblock, 8×

4 macroblock and 4×

4 macroblock.