DIGITAL BROADCASTING SYSTEM AND DATA PROCESSING METHOD

• US 20090060044A1
• Filed: 07/02/2008
• Published: 03/05/2009
• Est. Priority Date: 07/04/2007
• 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 8,102,920 B2
• Time in Patent Office: Days
• US Class Current: 375/240.160
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 20/55 for traffic information
• CPC Class Codes: H04H 60/13 Arrangements for device control affected by the broadcast information
• CPC Class Codes: H04L 7/0029 interpolation of received data signal
• CPC Class Codes: H04L 7/04 Speed or phase control by synchronisation signals H04L7/0075 takes precedence
• 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 21/41407 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 21/435 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
• CPC Class Codes: H04N 21/440263 by altering the spatial resolution, e.g. for displaying on a connected PDA
• CPC Class Codes: H04N 21/64322 IP
• CPC Class Codes: H04N 5/14 Picture signal circuitry for video frequency region cameras or camera modules comprising electronic image sensors, or control thereof H04N23/00

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, controlling power based upon the detected transmission parameter, thereby receiving a data group including requested mobile broadcast service data, extracting video data from the mobile broadcast service data and decoding the extracted video data, the decoding step comprising performing overlap smoothing on the video data and performing loop filtering on the overlap-smoothed video data.

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;

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

extracting video data from the mobile broadcast service data; and

decoding the extracted video data,

the decoding step comprising;

performing overlap smoothing on the video data; and

performing loop filtering on the overlap-smoothed video data.

2. The method of claim 1, further comprising:

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

3. The method of claim 2, 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; and

derandomizing the RS-decoded mobile broadcast service data.

4. The method of claim 1, the extracting step comprising obtaining data identification information for identifying a type of the mobile broadcast service data, wherein the video data is extracted based on the data identification information.

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

obtaining a reference block for reconstructing a current block;

performing motion compensation of quarter-pel unit based on a motion vector of quarter-pel unit and the reference block,

wherein the motion compensation performing step comprises applying a prescribed weight to pixel values at a pixel location of 1-pel unit.

6. The method of claim 1, the overlap smoothing performing step comprising performing the overlap smoothing on each two pixels in two directions centering on a block boundary to be smoothed, wherein a single pixel adjacent in each of the two directions centering on the block boundary is smoothed in a manner different from that of the smoothing process for other two pixels.

7. The method of claim 1, the loop filtering performing step comprising determining whether to perform filtering for a block boundary area based on a result from comparing a function value including a difference between pixels adjacent to the block boundary area to a threshold,

wherein when the function value is greater than the threshold, the filtering for the block boundary area is not performed.

8. The method of claim 7, the decoding comprising performing intensity compensation on an image having the loop filtering performed thereon, wherein the intensity compensation performing step comprises remapping a pixel value of a reference image based on fading parameter information.

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

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

a video data decoding unit decoding the extracted video data,

the video data decoding unit comprising;

a overlap smoothing unit performing overlap smoothing on the video data; and

a loop filtering unit performing loop filtering on the overlap-smoothed video data.

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

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

11. The digital broadcast system of claim 9, 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; and

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

12. The digital broadcast system of claim 9, wherein the demultiplexing unit extracts the video data based on data identification information obtained from the broadcast signal and wherein the data identification information identifies a type of the mobile broadcast service data.

13. The digital broadcast system of claim 9, the video data decoding unit comprising:

a motion compensation unit performing motion compensation of quarter-pel unit based on a motion vector of quarter-pel unit and a reference block,

wherein the motion compensation unit applies a prescribed weight to pixel values at a pixel location of 1-pel unit.

14. The digital broadcast system of claim 9, wherein the overlap smoothing unit performs the overlap smoothing on each two pixels in two directions centering on a block boundary to be smoothed and wherein the overlap smoothing unit smoothes a single pixel adjacent in each of the two directions centering on the block boundary in a manner different from that of the smoothing process for other two pixels.

15. The digital broadcast system of claim 9, wherein the loop filtering unit determines whether to perform filtering for a block boundary area based on a result from comparing a function value including a difference between pixels adjacent to the block boundary area to a threshold and wherein when the function value is greater than the threshold, the loop filtering unit does not perform the filtering for the block boundary area.