Method of processing traffic information and digital broadcast system

• US 8,340,133 B2
• Filed: 06/01/2011
• Issued: 12/25/2012
• Est. Priority Date: 10/05/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jin Pil, Kim, Young In, Hong, Ho Taek, Choi, In Hwan, Kwak, Kook Yeon, Lee, Hyoung Gon, Kim, Byoung Gill, Kim, Jin Woo, Kim, Jong Moon, Song, Won Gyu
• Primary Examiner(s): ZHU, BO HUI ALVIN
• Application Number:
  US13/150,815
• Publication Number:
  US 20110235724A1
• Time in Patent Office: 573 Days
• Field of Search: 370/470, 370/471, 370/473, 370/475, 370/476, 370/478, 370/480, 370/486, 370/487, 370/493, 370/535, 370/536, 370/537, 375/295, 707/699, 455/91
• US Class Current: 370/474
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 20/55 for traffic information
• CPC Class Codes: H04H 20/72 of terrestrial networks
• CPC Class Codes: H04H 40/27 specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• 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 21/41422 located in transportation means, e.g. personal vehicle arrangements specially adapted for transportation systems in broadcast systems H04H20/62
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• 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 21/64315 DVB-H
• CPC Class Codes: H04N 21/8126 involving additional data, e.g. news, sports, stocks, weather forecasts

Abstract

A digital broadcast transmitting/receiving system and a method for processing data are disclosed. The method for processing data may enhance the receiving performance of the receiving system by performing additional coding and multiplexing processes on the traffic information data and transmitting the processed data. Thus, robustness is provided to the traffic information data, thereby enabling the data to respond strongly against the channel environment which is always under constant and vast change.

Claims

1. A method of processing a digital broadcast signal in a transmitter, the method comprising:

pre-processing enhanced data, the pre-processing comprising;

forming an Reed Solomon (RS) frame including parity data and cyclic redundancy check (CRC) checksum data, the RS frame is comprised of a plurality of rows including the enhanced data, each of the rows having same size, wherein the forming the RS frame comprises;

performing an RS encoding to the enhanced data in a column direction of an RS frame payload to add the parity data for each of columns in the RS frame payload; and

performing a CRC coding to the RS encoded enhanced data in a row direction of the RS frame payload to add the CRC checksum data for each of the rows in the RS frame payload;

formatting enhanced data packets including the enhanced data in the formed RS frame;

multiplexing the enhanced data packets with main data packets having main audio and video (AV) data;

performing systematic RS encoding to data in the multiplexed main data packets and non-systematic RS encoding to data in the multiplexed enhanced data packets;

performing trellis-encoding to the systematic or non-systematic RS encoded data at a trellis encoder, the trellis encoder having at least one memory, the at least one memory being initialized at a beginning of a known data sequence;

multiplexing field synchronization data and segment synchronization data with the trellis-encoded data;

modulating the multiplexed field synchronization data and segment synchronization data with the trellis-encoded data; and

transmitting the modulated data.

2. The method of claim 1, the method further comprising:

performing a first exclusive OR (XOR) operation on the enhanced data to randomize the enhanced data.

3. The method of claim 2, the method further comprising:

performing a second XOR operation on the main AV data in the multiplexed main data packets and a portion of the multiplexed enhanced data packets, and shifting the other portion of the multiplexed enhanced data packets without performing the second XOR operation.

4. The method of claim 1, the pre-processing further comprising:

forming a data group including the enhanced data in the formed RS frame, known data and initialization data to be used for initializing the at least one memory in the trellis encoder.

5. The method of claim 4,

wherein the data group includes first, second and third data region, each data region including a plurality of data segments,

wherein data segments in the first and third data region have data area for the main AV data, and at least one data segment in the second data region is constituted by only the known data.

6. The method of claim 4, wherein the initialization data is located prior to the known data sequence.

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

a pre-processor configured to pre-process enhanced data, the pre-processor comprising;

a frame encoder configured to form an Reed Solomon (RS) frame including parity data and cyclic redundancy check (CRC) checksum data, the RS frame is comprised of a plurality of rows including the enhanced data, each of the rows having same size, wherein the frame encoder is further configured to;

perform an RS encoding to the enhanced data in a column direction of an RS frame payload to add the parity data for each of columns in the RS frame payload; and

perform a CRC coding to the RS encoded enhanced data in a row direction of the RS frame payload to add the CRC checksum data for each of the rows in the RS frame payload;

a packet formatter configured to format enhanced data packets including the enhanced data in the formed RS frame;

a first multiplexer configured to first multiplex the enhanced data packets with main data packets having main audio and video (AV) data;

an RS encoder configured to perform systematic RS encoding to data in the multiplexed main data packets and perform non-systematic RS encoding to data in the multiplexed enhanced data packets;

a trellis encoder configured to trellis-encode the systematic or non-systematic RS encoded data at a trellis encoder, the trellis encoder having at least one memory, the at least one memory being initialized at a beginning of a known data sequence;

a second multiplexer configured to multiplex field synchronization data and segment synchronization data with the trellis-encoded data;

a modulator configured to modulate the multiplexed field synchronization data and segment synchronization data with the trellis-encoded data; and

a RF up converter configured to transmit the modulated data.

8. The apparatus of claim 7, the apparatus further comprising:

a first randomizer configured to perforin a first exclusive OR (XOR) operation on the enhanced data to randomize the enhanced data.

9. The apparatus of claim 8, the apparatus further comprising:

a second randomizer configured to perform a second XOR operation on the main AV data in the multiplexed main data packets and a portion of the multiplexed enhanced data packets, and shift the other portion of the multiplexed enhanced data packets without performing the second XOR operation.

10. The apparatus of claim 7, the pre-processor further comprising:

a group formatter configured to form a data group including the enhanced data in the formed RS frame, known data and initialization data to be used for initializing the at least one memory in the trellis encoder.

11. The apparatus of claim 10,

wherein the data group includes first, second and third data region, each data region including a plurality of data segments,

wherein data segments in the first and third data region have data area for the main AV data, and at least one data segment in the second data region is constituted by only the known data.

12. The apparatus of claim 10, wherein the initialization data is located prior to the known data sequence.