CN1505403A - Digital television multi-service transmission method - Google Patents
Digital television multi-service transmission method Download PDFInfo
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- CN1505403A CN1505403A CNA021508895A CN02150889A CN1505403A CN 1505403 A CN1505403 A CN 1505403A CN A021508895 A CNA021508895 A CN A021508895A CN 02150889 A CN02150889 A CN 02150889A CN 1505403 A CN1505403 A CN 1505403A
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- data stream
- digital television
- scrambler
- mapping
- service transmission
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Abstract
The invention belongs to digital signal transmission field, especially relates to a method of multi-service data transmission in digital TV transmission. The traditional digital TV transmission system can transmit single video service commonly; it can't transmit several services by mixing them. The invention mixes all kinds of data service into a data flow and carries on buffer, then carries on disturbance code, RS coding, interweaving, synthesizing and mapping, inserting synchronous information according to the modulation mode, then it becomes mid frequency signal through QAM modulation and IF amplification, which is transmitted by transmitter of upper converter.
Description
Technical field
The invention belongs to digital signal transmission field, particularly the method for multi-service data transmission in the digital television transfer.
Background technology
Typical digital transmission system comprises transmitter and receiver.Digital modulation technique adds necessary supplementary more often with encoding digital signals, as: synchronizing signal, pilot signal etc.Digital signal behind the coding forms baseband signal through behind the channel filtering.This baseband signal sends after being modulated onto frequency band corresponding through upconverter.At receiving terminal, tuner transforms to base band after analog to digital converter obtains digital signal with high-frequency signal.This digital signal is resumed the information consistent with transmitting terminal after treatment.Digital television transmission system can only transmit single video traffic usually at present, can not directly a plurality of business datums (the TS stream of MPEG-2, IP bag etc.) be carried out mixed transport.
Summary of the invention
The purpose of this invention is to provide in a kind of digital television transfer the technical scheme of multi-service data (as the TS stream of MPEG-2, IP bag etc.) being carried out mixed transport.
The Digital Television multi-service transmission is characterized in that: the miscellaneous service data (the TS stream of MPEG-2, IP bag etc.) of input are mixed into circuit-switched data stream or multiplex data stream; When being circuit-switched data stream, being blended in the buffer of miscellaneous service data carried out, and carries out scrambler through scrambler again, RS encodes, interweaves, synthesizes mapping then, insert synchronizing information then, amplify the formation intermediate-freuqncy signal, send transmitter to launch by upconverter through QAM modulation and IF.
During for multiplex data stream, multiplex data stream cushions respectively, scrambler, RS are encoded, interweave, shone upon, mapping output with each circuit-switched data stream mixes by time division multiplexing mode then, and insertion synchronizing information, amplify the formation intermediate-freuqncy signal through QAM modulation and IF, send transmitter to launch by upconverter.Multiplex data stream also can shared same scrambler and the RS encoder carry out scrambler and RS coding.
First byte of the packet that each is professional is as this professional unique identification.Two-dimentional Gray code mapping is all adopted in mapping.
The present invention can directly accept the business of multiple different data format in digital television transmission system, the miscellaneous service data are packaged into the packet of consolidation form when being input to buffer, different business first byte-identifier of packet.Carry out the RS coding with packaged packet, the difference of the data based modulation system behind the coding can adopt different interweaving and the constellation point mapping, after after QAM modulation and the intermediate frequency amplification, deliver to the transmitter emission by up-conversion.Realized the direct mixed transport of multiple business data thus.
Description of drawings
Fig. 1 is a transmission system block diagram of the present invention.
Embodiment
As shown in Figure 1, TS stream, IP bag and other business datums of the MPEG-2 of input are mixed into a circuit-switched data to flow to into buffer and cushions, the miscellaneous service data are packaged into the packet of consolidation form when being input to buffer, data packet length is set at 188 bytes, wherein first byte is as each professional unique identification field (the TS stream packets as MPEG-2 adopts 16 systems 47, IP bag to adopt 16 system B8, other business datums to define as required), and remaining 187 byte is as the net amount certificate.Packet after the buffering enters scrambler and carries out scrambler, carry out the RS coding then, the difference of the data based modulation system behind the coding can adopt different interweaving and the mapping of two-dimentional Gray code constellation point, insert corresponding synchronous information according to the difference of modulation system then, amplify the formation intermediate-freuqncy signal through QAM modulation and IF at last, send transmitter to launch by upconverter.
Claims (4)
1. the Digital Television multi-service transmission is characterized in that: the miscellaneous service data mixing of input is become circuit-switched data stream or multiplex data stream; When being circuit-switched data stream, being blended in the buffer of miscellaneous service data carried out, and carries out scrambler through scrambler, RS encodes, interweaves, synthesizes mapping again, insert synchronizing information then, amplify the formation intermediate-freuqncy signal, send transmitter to launch by upconverter through QAM modulation and IF; During for multiplex data stream, multiplex data stream cushions respectively, scrambler, RS are encoded, interweave, shone upon, mapping output with each circuit-switched data stream mixes by time division multiplexing mode then, and insertion synchronizing information, amplify the formation intermediate-freuqncy signal through QAM modulation and IF, send transmitter to launch by upconverter
2. Digital Television multi-service transmission as claimed in claim 1 is characterized in that: described multiplex data stream can shared same scrambler and the RS encoder carry out scrambler and RS coding.
3. Digital Television multi-service transmission as claimed in claim 1 is characterized in that: described miscellaneous service comprises TS stream, IP bag or other business of MPEG-2; First byte of the packet that each is professional is as this professional unique identification.
4. Digital Television multi-service transmission as claimed in claim 1 is characterized in that: two-dimentional Gray code mapping is adopted in described mapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021508895A CN1505403A (en) | 2002-12-02 | 2002-12-02 | Digital television multi-service transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021508895A CN1505403A (en) | 2002-12-02 | 2002-12-02 | Digital television multi-service transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1505403A true CN1505403A (en) | 2004-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021508895A Pending CN1505403A (en) | 2002-12-02 | 2002-12-02 | Digital television multi-service transmission method |
Country Status (1)
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| CN (1) | CN1505403A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753338A (en) * | 2008-12-16 | 2010-06-23 | 华为技术有限公司 | Equipment, method and system for supporting business protection |
| CN1992570B (en) * | 2005-12-28 | 2011-05-11 | Lg电子株式会社 | Digital broadcasting system and method of processing traffic information |
| US7978697B2 (en) | 2005-10-05 | 2011-07-12 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8018977B2 (en) | 2005-10-05 | 2011-09-13 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8473807B2 (en) | 2005-10-05 | 2013-06-25 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US9136960B2 (en) | 2005-10-05 | 2015-09-15 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
-
2002
- 2002-12-02 CN CNA021508895A patent/CN1505403A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8340133B2 (en) | 2005-10-05 | 2012-12-25 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8018978B2 (en) | 2005-10-05 | 2011-09-13 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| USRE49757E1 (en) | 2005-10-05 | 2023-12-12 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8018977B2 (en) | 2005-10-05 | 2011-09-13 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| USRE48627E1 (en) | 2005-10-05 | 2021-07-06 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8018976B2 (en) | 2005-10-05 | 2011-09-13 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8098694B2 (en) | 2005-10-05 | 2012-01-17 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8473807B2 (en) | 2005-10-05 | 2013-06-25 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US7978697B2 (en) | 2005-10-05 | 2011-07-12 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| USRE47294E1 (en) | 2005-10-05 | 2019-03-12 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| USRE46891E1 (en) | 2005-10-05 | 2018-06-12 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US8542709B2 (en) | 2005-10-05 | 2013-09-24 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| US9136960B2 (en) | 2005-10-05 | 2015-09-15 | Lg Electronics Inc. | Method of processing traffic information and digital broadcast system |
| CN1992566B (en) * | 2005-12-28 | 2012-10-10 | Lg电子株式会社 | Digital broadcasting system and method of processing traffic information |
| CN1992570B (en) * | 2005-12-28 | 2011-05-11 | Lg电子株式会社 | Digital broadcasting system and method of processing traffic information |
| CN1992567B (en) * | 2005-12-28 | 2013-01-16 | Lg电子株式会社 | Digital broadcasting system and method of processing traffic information |
| CN101753338A (en) * | 2008-12-16 | 2010-06-23 | 华为技术有限公司 | Equipment, method and system for supporting business protection |
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| WD01 | Invention patent application deemed withdrawn after publication |