CN1333592C - MPEG sync head processing method of digital TV ground transmission system - Google Patents
MPEG sync head processing method of digital TV ground transmission system Download PDFInfo
- Publication number
- CN1333592C CN1333592C CNB2004100002573A CN200410000257A CN1333592C CN 1333592 C CN1333592 C CN 1333592C CN B2004100002573 A CNB2004100002573 A CN B2004100002573A CN 200410000257 A CN200410000257 A CN 200410000257A CN 1333592 C CN1333592 C CN 1333592C
- Authority
- CN
- China
- Prior art keywords
- synchronous head
- mpeg
- data
- head
- bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention discloses a processing method of an MPEG synchronous head in a digital television ground broadcast transmission system. At a sending end, a synchronous head 47H of a second MPEG pack drops out of scrambling processing and directly passes through a scrambling module, the scrambling module is reset by presetting information or system information in a data stream, the 47H synchronous head comes out of the scrambling module, and other information data of the second MPEG pack processed by scrambling jointly participate the subsequent processing of the sending end. At a receiving end, after the 47H synchronous head is processed by demodulation, de-mapping, and channel decoding, the 47H synchronous head is already restored before entering in a descrambling module; although the 47H synchronous head is once-through, the data information needs descrambling restoration. The method makes transparent transmission for inputting a TS stream, namely to be insensitivity for synchronous information, thereby, makes allowance for the application of widening a transmission system for the future, and enhances system suitability.
Description
Technical field the invention belongs to digital signal transmission field, particularly the processing method of the synchronization character that in the digital television ground broadcast transmission system MPEGII in the MPEGII transport stream (TS stream) is wrapped.
The typical digital television ground broadcast transmission system of background technology 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.
At present, existing three kinds of digital television ground broadcast transmission systems, the i.e. ISDB-T of the ATSC of Ou Zhou DVB-T, the U.S. and Japan has corresponding particular procedure mode for the synchronous head 47H of the MPEGII in MPEGII transport stream bag, but all only is applicable to the transport stream of MPEG II.
In the DVB-T in Europe system, referring to Fig. 2 and Fig. 3, because multicarrier system employing data block is handled, data do not form frame structure in invert fast fourier transformation (IFFT) time domain part before, do not insert in order to provide coding module required synchronous and repositioning information yet.Therefore, can only utilize the specific information in the data flow, promptly the synchronizing signal of MPEGII bag reaches synchronously and the purpose that resets.And, also need this synchronizing signal is carried out certain processing for reaching specific purposes.Making a start, at first with the synchronous head 47H of the MPEGII bag in the TS stream of input, every the upset of 7 MPEGII bags once, synchronous head becomes B8H.Can be used as the initial signal that resets of scrambler module with this B8H at interval, that periodically occur.Owing to need the synchronous head 47H of MPEG II bag be discerned and handle, therefore also just determined the unicity of the manageable data stream format of DVB-T system, promptly can only be at the TS stream format of MPEGII.
In the ATSC of U.S. system,, equally also there is above-mentioned unicity problem to exist referring to Fig. 4 and Fig. 5.Owing to single carrier full-time territory processing, so can add specific information in the data flow,, be used as the synchronous of encoding and decoding and reset as section, field sync signal etc.Though coding/decoding module is not handled the synchronous head 47H of MPEGII bag, but owing to consider the needs that receiving end is regularly recovered etc., after sign map, will be replaced by a definite section synchronizing symbol at the synchronous head 47H head of the MPEGII bag of making a start and transmit.At receiving terminal, after equilibrium, the decoding, again 47H is added back in the data flow TS stream of the MPEGII that regains one's integrity.As seen, owing to still need the synchronous head 47H of MPEGII bag is discerned and handles, so the ATSC system still can only be at the TS stream of MPEG II.
Equally, in the ISDB-T of Japan system, system is used the MSB of the synchronous head 47H of MPEGII bag as the synchronizing signal of its OFDM frame.Therefore also determined ISDB-T only to be applicable to the character of the TS stream of MPEG II.
Owing to data transmission format may change along with the development of technology.Therefore, we wish data transmission system, can accomplish transparent transmission to input TS stream, and are promptly insensitive to synchronizing information.Like this, this transmission system has improved adaptability for the application of may expanding from now on makes allowances.
Summary of the invention the objective of the invention is to provide for digital television ground broadcast transmission system a kind of method of new processing MPEG synchronous head.This method can be accomplished transparent transmission to input TS stream, and is insensitive to synchronizing information, thereby provides possibility for transmission system transmission MPEGII wraps other TS streams in addition.
The present invention is applicable to new digital television ground broadcast transmission system.In this transmission system, data flow transmitted is divided into continuous one by one Frame and transmits.Each Frame comprises 3 parts, is respectively preset information, system information and data message, and forms simple single order frame circulation with this.This transmission system belongs to a kind of hybrid transmission system, can transmit fixed service (TV signal is fixing to be received), mobile service (TV signal moves reception, data-signal moves reception) and data service (data-signal moves reception).Wherein, fixed service can be selected the 16-OQAM transmission mode, and data message is the data symbol of four level; Mobile service can be selected 4-OQAM transmission mode or its enhancement mode (4-OQAM-E), the 4-OQAM-E transmission mode can be by realizing that in conjunction with modes such as Nordstrom-Robinson sign indicating numbers data message is the data symbol of two level in the 4-OQAM transmission mode; Data service can be selected the 4-OQAM-E transmission mode.
The object of the present invention is achieved like this: in above-mentioned new digital television ground broadcast transmission system, at transmitting terminal, the synchronous head 47H of MPEGII bag does not participate in the scrambler processing and directly passes through the scrambler module in the data message, the scrambler module realizes resetting by preset information in the data flow or system information, the subsequent treatment of the data message fellowship transmitting terminal from scrambler module 47H synchronous head that comes out and the MPEGII bag of handling through scrambler except that the 47H synchronous head, participate in the ISN coding and afterwards in interweave, through in data fellowship sign map after interweaving, insert supplementary, and modulate emission; At receiving terminal, the 47H synchronous head recovered before transmitting data stream enters descrambling module, and for descrambling module, the 47H synchronous head leads directly to, and the data message in the MPEG II bag except that the 47H synchronous head then needs descrambling to recover.
Under different transmission mode, the channel coding/decoding process of transmission system may be different.Such as, with respect to 4-OQAM and 4-OQAM-E transmission mode, the channel coding/decoding of 16-OQAM transmission mode does not just need encoding and decoding of outer sign indicating number and outer deinterleaving to interweave outward.Core of the present invention be in data through channel coding/decoding, mapping/separate in the processing procedure of mapping and modulating/demodulating etc., be transparent to the processing of the 47H synchronous head of the bag of the MPEG II in the data flow.No matter send into the synchronous head of the MPEG II bag of transmission system, be 47H or other synchronizing informations, and when leaving transmission system, the information of this synchronous head can be recovered automatically.
The invention has the advantages that: in digital terrestrial television transmission system,, promptly do not accomplish transparent transmission to TS stream to the special processing of the MPEGII bag synchronous head in the TS stream, insensitive to synchronizing information.Like this, this transmission system makes allowances for the application of may expanding of compatible other transformats from now on.
Below in conjunction with drawings and Examples the present invention is described further.
Description of drawings Fig. 1 is the data structure schematic diagram of MPEGII bag.
Fig. 2 is European DVB-T system block diagram.
Fig. 3 is the processing procedure of the European synchronous head 47H that in the DVB-T system MPEGII is wrapped.
Fig. 4 is a U.S. ATSC system block diagram.
Fig. 5 is to the processing procedure of the synchronous head 47H of MPEGII bag in the U.S. ATSC system.
Fig. 6 is the digital terrestrial television transmission system block diagram that the present invention is directed to.
Fig. 7 is the transparent transmission process of in the digital terrestrial television transmission system of the present invention MPEGII being wrapped.
Among Fig. 3, figure A represents the data structure of MPEG II bag, is made of the data of synchronous head 47H and 187 bytes; Figure B represents the data format behind the scrambler, and B8H is obtained by synchronous head 47H negate; Figure C represents the data structure behind the RS coding, has added 16 guard bytes; Data structure after figure D represents to interweave, interleave depth is 12 bytes.
Among Fig. 5, figure A represents the data structure of MPEG II bag; Figure B represents the data format behind the scrambler; Figure C represents the data structure behind the RS coding, has added 20 guard bytes; Data structure after figure D represents to interweave; Figure E represents the section of insertion/field/frame synchronization and the data structure after sign map, and sync byte is replaced by known " 5-5-55 ".
Among Fig. 7, figure A represents the data structure of MPEG II bag; Figure B represents the data format behind the scrambler.Synchronous head and information data after the scrambler are handled equally, thereby satisfy the requirement of transparent transmission.
Embodiment by the modulation system difference, has three kinds of transmission modes at present in new digital tv ground broadcasting:
16-OQAM: data message is the data symbol of four level;
4-OQAM: data message is the data symbol of two level;
4-OQAM-E: i.e. the enhancement mode of 4-OQAM, can be by in the 4-OQAM transmission mode, realizing that in conjunction with modes such as Nordstrom-Robinson sign indicating numbers data message is the data symbol of two level.
The corresponding corresponding transport service of transmission mode is respectively fixed service (TV signal is fixing to be received), mobile service (TV signal moves reception, data-signal moves reception) and data service (data-signal moves reception).Wherein, fixed service can be selected 16-OQAM; Mobile service can be selected 4-OQAM or 4-OQAM-E; Data service can be selected 4-OQAM-E.
Referring to Fig. 6, under the 16-OQAM transmission mode, at transmitting terminal, when MPEGII synchronous head 47H enters channel transmission system in the data message, the scrambler module is straight-through to the 47H synchronous head, handles and only the data message except that the 47H synchronous head in the MPEGII bag of sending into is carried out scrambler.The scrambler module resets by preset information in the data flow or system information.After scrambler finishes, the data message fellowship ISN coding in 47H synchronous head and the MPEGII bag except that the 47H synchronous head; After the ISN end-of-encode, interweave in the data message fellowship in 47H synchronous head and the MPEGII bag except that the 47H synchronous head; In interweave and finish back data fellowship sign map, insert supplementary, and modulate emission.
At receiving terminal, the 47H sync head processing method of MPEGII bag is as follows: receiving terminal carries out processings such as demodulation to the received signal and afterwards recovers transmitting data stream, and the data-signal fellowship that recovers interweaves in separating; Inner decoding is carried out in the output that interweaves in separating; Arrive byte conversion through bit after inner decoding finishes, the 47H synchronous head recovers; For descrambling module, the 47H synchronous head leads directly to, and the data message in the MPEGII bag except that the 47H synchronous head then needs descrambling to recover.
Under the 16-OQAM transmission mode, ISN coding is a kind of in trellis coding, convolutional encoding, CRC check and TPC (Turbo product code) coding, perhaps its combination; In to interweave be Bit Interleave or symbol interleaving, perhaps its combination.
Referring to Fig. 6, under 4-OQAM and 4-OQAM-E transmission mode, at transmitting terminal, when MPEGII synchronous head 47H enters channel transmission system in the data message, the scrambler module is straight-through to the 47H synchronous head, handles and only the data message except that the 47H synchronous head in the MPEG II bag is carried out scrambler.The scrambler module resets by preset information in the data flow or system information.After scrambler finishes, the outer sign indicating number coding of the data message fellowship in 47H synchronous head and the MPEGII bag except that the 47H synchronous head; Data after the end-of-encode of outer sign indicating number are sent into external interleaver; External interleaver output carry out the ISN coding and in interweave; In interweave and finish back data fellowship sign map, insert processing such as supplementary, and modulate emission.
At receiving terminal, the 47H sync head processing method of MPEGII bag is as follows: receiving terminal carries out processings such as demodulation to the received signal and afterwards recovers transmitting data stream, and the data-signal fellowship that recovers interweaves and inner decoding in separating; Inner decoding output is sent into to byte conversion through symbol and is separated external interleaver; Separate the outer output that interweaves and carry out outer-decoder again; After outer-decoder finished, the 47H synchronous head recovered; For descrambling module, the 47H synchronous head leads directly to, and the data message in the MPEGII bag except that the 47H synchronous head then needs descrambling to recover.
Under 4-OQAM and the 4-OQAM-E pattern, outer sign indicating number can be the RS coding; Interweaving outward can be the byte convolutional interleave; ISN coding can be a kind of in trellis coding, convolutional encoding, TPC coding and NR (Nordstrom-Robinson) coding, perhaps its combination; In to interweave can be Bit Interleave or symbol interleaving, perhaps its combination.
In sum, after the 47H synchronous head is handled through chnnel coding, mapping, insertion supplementary and modulation etc., through Channel Transmission receiving terminal by demodulation, separate after mapping and channel-decoding etc. come out, can recover the form of this 47 synchronous head and MPEG II bag automatically.No matter send into the synchronous head of the MPEG II bag of transmission system, be 47H or other synchronizing informations, and when leaving transmission system, the information of this synchronous head can be recovered automatically.
Core of the present invention be in data through channel coding/decoding, mapping/separate in the processing procedure of mapping and modulating/demodulating etc., be transparent to the processing of the 47H synchronous head of the bag of the MPEGII in the data flow.
Claims (9)
1. MPEG sync head processing method in the digital television ground broadcast transmission system, described transmission system is divided into continuous one by one Frame with data flow transmitted and transmits, each Frame comprises preset information, system information and data message, and form the circulation of simple single order frame with this, it is characterized in that:
At transmitting terminal, the synchronous head 47H of MPEG II bag does not participate in the scrambler processing and directly passes through the scrambler module in the described data message, the scrambler module realizes resetting by preset information in the data flow or system information, the subsequent treatment of the data message fellowship transmitting terminal from scrambler module 47H synchronous head that comes out and the MPEG II bag of handling through scrambler except that the 47H synchronous head, promptly participate in ISN coding and afterwards in interweave, through in data fellowship sign map after interweaving, insert supplementary, and modulate emission;
At receiving terminal, the 47H synchronous head passes through demodulation, separates after mapping and the channel-decoding processing, recovers before entering descrambling module, for descrambling module, the 47H synchronous head leads directly to, and the data message in the MPEG II bag except that the 47H synchronous head then needs descrambling to recover.
2. MPEG sync head processing method according to claim 1, it is characterized in that: under the 16-OQAM transmission mode, at transmitting terminal, when the 47H synchronous head enters channel transmission system, the scrambler module is straight-through to the 47H synchronous head, handle and only the data message except that the 47H synchronous head in the MPEG II bag of sending into is carried out scrambler, the scrambler module resets by preset information in the data flow or system information; After scrambler finishes, the data message fellowship ISN in 47H synchronous head and the MPEG II bag except that the 47H synchronous head encode and afterwards in interweave; Through in data fellowship sign map after interweaving, insert supplementary, and modulate emission;
At receiving terminal, the 47H sync head processing method of MPEGII bag is as follows: receiving terminal carries out recovering transmitting data stream after the demodulation process to the received signal, and the data-signal fellowship that recovers interweaves in separating; Inner decoding is carried out in the output that interweaves in separating; Arrive byte conversion through bit after inner decoding finishes, the 47H synchronous head recovers; For descrambling module, the 47H synchronous head leads directly to, and the data message in the MPEGII bag except that the 47H synchronous head then needs descrambling to recover.
3. MPEG sync head processing method according to claim 2 is characterized in that: ISN coding is a kind of in trellis coding, convolutional encoding, CRC check and the TPC coding, perhaps its combination.
4. according to claim 2 or 3 described MPEG sync head processing method, it is characterized in that: in to interweave be Bit Interleave or symbol interleaving, perhaps its combination.
5. MPEG sync head processing method according to claim 1, it is characterized in that: under 4-OQAM and 4-OQAM-E transmission mode, at transmitting terminal, when the 47H synchronous head enters channel transmission system, the scrambler module is straight-through to the 47H synchronous head, handle and only the data message except that the 47H synchronous head in the MPEG II bag of sending into is carried out scrambler, the scrambler module resets by preset information in the data flow or system information; After scrambler finishes, the outer sign indicating number coding of the data message fellowship in 47H synchronous head and the MPEG II bag except that the 47H synchronous head; Data after the end-of-encode of outer sign indicating number are sent into external interleaver; External interleaver output carry out the ISN coding and in interweave; In interweave and finish back data fellowship sign map, insert supplementary, and modulate emission;
At receiving terminal, the 47H sync head processing method of MPEG II bag is as follows: receiving terminal carries out recovering transmitting data stream after the demodulation process to the received signal, and the data-signal fellowship that recovers interweaves and inner decoding in separating; Inner decoding output is sent into to byte conversion through symbol and is separated external interleaver; Separate the outer output that interweaves and carry out outer-decoder again; After outer-decoder finished, the 47H synchronous head recovered; For descrambling module, the 47H synchronous head leads directly to, and the data message in the MPEG II bag except that the 47H synchronous head then needs descrambling to recover.
6. MPEG sync head processing method according to claim 5 is characterized in that: outer sign indicating number coding is the RS coding; Interweaving outward is the byte convolutional interleave.
7. according to claim 5 or 6 described MPEG sync head processing method, it is characterized in that: ISN coding is a kind of in trellis coding, convolutional encoding, TPC coding and NR (Nordstrom-Robinson) coding, perhaps its combination.
8. according to claim 5 or 6 described MPEG sync head processing method, it is characterized in that: in to interweave be Bit Interleave or symbol interleaving, perhaps its combination.
9. MPEG sync head processing method according to claim 7 is characterized in that: in to interweave be Bit Interleave or symbol interleaving, perhaps its combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100002573A CN1333592C (en) | 2004-01-12 | 2004-01-12 | MPEG sync head processing method of digital TV ground transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100002573A CN1333592C (en) | 2004-01-12 | 2004-01-12 | MPEG sync head processing method of digital TV ground transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1638471A CN1638471A (en) | 2005-07-13 |
| CN1333592C true CN1333592C (en) | 2007-08-22 |
Family
ID=34845497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100002573A Expired - Fee Related CN1333592C (en) | 2004-01-12 | 2004-01-12 | MPEG sync head processing method of digital TV ground transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1333592C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7983354B2 (en) * | 2005-11-25 | 2011-07-19 | Samsung Electronics Co., Ltd. | Digital broadcast transmitter/receiver having an improved receiving performance and signal processing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168208A (en) * | 1995-04-06 | 1997-12-17 | 齐尼思电子公司 | ATV/MPEG sync system |
| CN1391382A (en) * | 2001-06-11 | 2003-01-15 | Lg电子株式会社 | Digital residual side band transmission systems |
-
2004
- 2004-01-12 CN CNB2004100002573A patent/CN1333592C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1168208A (en) * | 1995-04-06 | 1997-12-17 | 齐尼思电子公司 | ATV/MPEG sync system |
| CN1391382A (en) * | 2001-06-11 | 2003-01-15 | Lg电子株式会社 | Digital residual side band transmission systems |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1638471A (en) | 2005-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1953440B (en) | Single carrier transmitting system and the method thereof of dynamic environment variation can be adapted to | |
| KR102221565B1 (en) | Wakeup message for a digital television system | |
| CN1968232B (en) | System for transmitting single carrier and transmitting method thereof | |
| US8396051B2 (en) | Digital broadcasting system and method of processing data | |
| KR102295042B1 (en) | System physical layer pipe for a digital television system | |
| JP2010532601A (en) | Apparatus and method for use in a mobile / handheld communication system | |
| US20110200136A1 (en) | Digital broadcasting system and method for transmitting and receiving digital broadcast signal | |
| CN103856295A (en) | Transmitter and transmitting method | |
| US20110258669A1 (en) | System and method for multi-carrier multiplexing | |
| CN1333592C (en) | MPEG sync head processing method of digital TV ground transmission system | |
| CN1319353C (en) | Single carrier transmission system able to reducing signal distortion and its method | |
| CN100512433C (en) | Method, apparatus and system for transmitting wireless digital TV-set and broadcast | |
| EP2073400B1 (en) | Satelite television system, signals and coder therefore | |
| EP1889433B1 (en) | Apparatus, systems and methods for providing time diversity for mobile broadcast services | |
| EP2230838B1 (en) | Apparatus, systems and methods for providing out-of-band signaling for ATSC vestigial sideband modulation | |
| CN101110626B (en) | Digital signal emitting and receiving system and method thereof | |
| US8559372B2 (en) | Digital broadcasting system and method for transmitting and receiving digital broadcast signal | |
| CN100356785C (en) | Base band OQAM signal generating method in digital ground broadcasting transmission | |
| Zhang et al. | SFN structure and field trials based on satellite links for DTMB system | |
| TW201330595A (en) | Method for channel searching and transmitting end apparatus and receiving end apparatus using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070822 Termination date: 20120112 |