Digital television system

• US 7,742,530 B2
• Filed: 02/02/2005
• Issued: 06/22/2010
• Est. Priority Date: 09/26/2000
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, In Hwan, Gu, Young Mo, Kwak, Kook Yeon, Kang, Kyung Won
• Primary Examiner(s): Philippe; Gims S
• Application Number:
  US11/050,298
• Publication Number:
  US 20050129132A1
• Time in Patent Office: 1,966 Days
• Field of Search: 375/240.27, 375/262, 375/265
• US Class Current: 375/240.27
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04N 19/88 involving rearrangement of data among different coding units, e.g. shuffling, interleaving, scrambling or permutation of pixel data or permutation of transform coefficient data among different blocks
• 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 21/2383 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 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• 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

Abstract

Disclosed is a digital television system carrying out modulation/demodulation by VSB(vestigial side band). A VSB transmitter includes an additional error correction encoder designed in a manner that a signal mapping of a TCM encoder is considered, a multiplexer(MUX), a TCM encoder operating in a manner corresponding to state transition processes of the additional error correction encoder, and a signal transmission part including an RF converter. And, A VSB receiver includes a signal receiver part receiving a signal transmitted from the transmitter, a TCM decoder, a signal processing part including a derandomizer, and an additional error correction decoder part.

Claims

1. A method of processing a digital broadcast signal generated from encoding additional input data for additional error correction, multiplexing the encoded additional input data with an input data, Reed-Solomon (RS) encoding the multiplexed input data, interleaving the RS-encoded data, performing TCM encoding on the interleaved data, and transmitting a Radio Frequency (RF) digital broadcast signal including the TCM-encoded data, wherein performing TCM encoding includes encoding a first input bit to output a first output bit, precoding a second input bit to a output second bit and mapping the first output bit, second output bit and the first input bit to a value, the method comprising:

receiving the RF digital broadcast signal containing first service data corresponding to the input data and second service data corresponding to the additional input data;

demodulating the broadcast signal;

performing trellis decoding on the first and second service data in the demodulated broadcast signal for first error correction in order to correct errors in the first and second service data that occurred during reception of the broadcast signal;

outputting the first and second service data as a soft signal; and

decoding the trellis-decoded second service data for second error correction in order to additionally correct errors in the second service data that occurred during the reception of the broadcast signal.

2. The method of claim 1, wherein the first service data comprise ATSC data.

3. The method of claim 1, wherein the first and second service data are outputted as a soft signal using one of MAP (Maximum A posteriori Probability) and SOVA (Soft-Out Viterbi Algorithm).

4. A method of processing a digital broadcast signal generated from encoding additional input data for additional error correction, multiplexing the encoded additional input data with an input data, Reed-Solomon (RS) encoding the multiplexed input data, interleaving the RS-encoded data, performing TCM encoding on the interleaved data, and transmitting a Radio Frequency (RF) digital broadcast signal including the TCM-encoded data, wherein performing TCM encoding includes encoding a first input bit to output a first output bit, precoding a second input bit to a output second bit and mapping the first output bit, second output bit and the first input bit to a value, the method comprising:

receiving the RF digital broadcast signal containing first service data corresponding to the input data and second service data corresponding to the additional input data;

demodulating at least one of the first service data and second service data included in the broadcast signal;

performing trellis decoding on the second service data in the demodulated broadcast signal for first error correction in order to correct errors in the second service data that occurred during reception of the broadcast signal;

outputting the second service data as a soft signal form; and

decoding the trellis-decoded second service data for second error correction in order to additionally correct errors in the second service data that occurred during the reception of the broadcast signal.

5. The method of claim 4, wherein the first service data comprise ATSC data.

6. The method of claim 4, wherein the first and second service data are outputted as a soft signal using one of MAP (Maximum A posteriori Probability) and SOVA (Soft-Out Viterbi Algorithm).