CN101867554B - Device and method for adaptively identifying and tracking synchronous head in cable digital television - Google Patents
Device and method for adaptively identifying and tracking synchronous head in cable digital television Download PDFInfo
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- CN101867554B CN101867554B CN201010192872.4A CN201010192872A CN101867554B CN 101867554 B CN101867554 B CN 101867554B CN 201010192872 A CN201010192872 A CN 201010192872A CN 101867554 B CN101867554 B CN 101867554B
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Abstract
The invention discloses a device for adaptively identifying and tracking a synchronous head in a cable digital television. The device comprises a data demapping module, a phase rotation and differential decoding module, a symbol-to-byte conversion module, a synchronous head identification module, a deinterleaving module, a radio station (RS) packet decoding module, a descrambling module and a moving picture experts group (MPEG) bit stream homogenization module which are connected with one another sequentially, and a data synchronous head identification locking module 205. The invention also discloses a method for adaptively identifying and tracking the synchronous head in the cable digital television, which comprises the following steps of: initializing; receiving data; demapping; performing phase rotation and differential decoding; mapping from a symbol to a byte; detecting the synchronous head; selecting an access; finding the synchronous head; and determining a quadrature amplitude modulation (QAM) modulation mode. The device and the method have the advantages of simple structure, convenient implementation, wide practicability and capacity of identifying and tracking the synchronous head information effectively under a condition of a blind mode.
Description
Technical field
The invention belongs to field of digital television transmission, relate in particular to the device and method of the identification of self adaptation in a kind of cable digital TV and tracking synchronous head.
Background technology
Digital cable TV is the development trend that is based upon a kind of broadcast service ，Ta Yeshi world today cable tv broadcast transmitting on cable television network.This system is the cable television system that anolog TV signals are converted to digital signal and process and transmit in digital mode.
Up to the present, several different standards have been formed in the world; Take Europe as example, and from nineteen ninety-five, Europe has been issued Digital Television Terrestrial Broadcasting (DVB-T), digital satellite broadcasting (DVB-S), Digital Television wired broadcasting (DVB-C) standard successively.China has also started the work of piloting of digital cable TV in calendar year 2001.
In terrestrial DTV wired broadcasting (DVB-C) standard, for receiver, bring in and say, all are all unknown (as code check, QAM modulating mode etc.) for the signals that transmitting terminal is launched, and in the signal of launching at transmitting terminal without any known training sequence (as PN code etc.), so receiving terminal must judge code check according to signal characteristic, QAM modulating mode.But in the feature providing of DVBC system standard, these information may all cannot prophet obtain for receiver, and this has just increased the design difficulty of receiver module.
In traditional digital video broadcast system (as shown in Figure 1), forward error correction (FEC) module can be carried out according to different QAM modulating modes corresponding constellation mapping (different planispheres corresponding to QAM modulating mode).After carrying out constellation mapping according to different Q AM modulating mode, in the data of demapping, find and judge in this demapping data block whether have effect data packet head.If successfully find effective data packet head information, its data below are just assumed to effective data packets, continue to find.After next number arrives according to position, packet header (suppose that the data break amount between each packet header is 204 fixing bytes, below claim " data packet head level is put "), then judge whether it is valid data packet header.Continuous several times is set up and determines whether valid data header packet information in data packet head level like this.If it is synchronous head is found, otherwise restarts.The determination methods in valid data packet header is the specific header data of these data.
But in traditional method, its prerequisite is based on carrying out in the known situation of QAM modulating mode, but when unknown if there is modulating mode, traditional receiver demapping just cannot be carried out.Therefore, need badly a kind ofly under blind mode condition, can effectively identify the device and method with tracking synchronous head information.
Summary of the invention
The object of the invention is to overcome the defect of above-mentioned prior art, at QAM modulation intelligence unknown and do not have significantly can the condition of identifying information under, proposing a kind of can effectively solution cannot demapping and the device and method of None-identified synchronous head.
In order to realize foregoing invention object, the present invention proposes the device of the identification of self adaptation in a kind of cable digital TV and tracking synchronous head, comprises that data demapping module, phase rotating and the differential decoding module, the symbol that are linked in sequence wrap decoding module, descrambling code module, MPEG bit stream homogenizing module to byte conversion module, synchronous head identification module, de-interleaving block, RS; Also comprise data synchronous head identification locking module, described phase rotating and differential decoding module also have the second input, and described synchronous head identification module also has the second output;
The described data synchronous head identification input of locking module and the second output of synchronous head identification module are connected, and the output of described data synchronous head identification locking module is connected with the second input of phase rotating and differential decoding module.
In addition, the present invention also proposes the method for the identification of self adaptation in a kind of cable digital TV and tracking synchronous head, comprises the following steps:
A. initialization, carries out initialization to the register value of the relevant sub-module of forward error correction block;
B. receive data, control the I, the Q two paths of data that receive forward error correction block input;
C.QAM modulating mode is known and tracking phase, and this step is divided into c1 and two stages of c2 according to QAM modulating mode identification situation:
C1.QAM modulating mode cognitive phase, symbol is respectively combined into byte form by the significant bit of phase rotating and differential decoding module output according to QAM modulating mode to byte conversion module and according to QAM modulating mode serial output separately;
C2.QAM modulating mode tracking phase, symbol is combined into byte form serial output by the significant bit of phase rotating and the output of differential decoding module according to definite QAM modulating mode to byte conversion module;
D. phase rotating and differential decoding, select its high dibit to carry out differential decoding to the output of data demapping module, according to QAM modulating mode identification situation, is divided into e1 and two stages of e2:
D1.QAM modulating mode cognitive phase, chooses corresponding significant bit parallel output according to different Q AM modulating mode phase rotating and differential decoding module;
D2.QAM modulating mode tracking phase, phase rotating and differential decoding module are only exported the significant bit of determining QAM modulating mode;
E. symbol, to the mapping of byte, is divided into e1 and two stages of e2 according to QAM modulating mode identification situation:
E1.QAM modulating mode cognitive phase, symbol is respectively combined into byte form by the significant bit of phase rotating and differential decoding module output according to QAM modulating mode to byte conversion module and according to QAM modulating mode serial output separately;
E2.QAM modulating mode tracking phase, symbol is combined into byte form serial output by the significant bit of phase rotating and the output of differential decoding module according to definite QAM modulating mode to byte conversion module;
F. synchronous head detects, and according to QAM modulating mode identification situation, is divided into f1 and two stages of f2:
F1.QAM modulating mode cognitive phase, synchronous head identification module is found synchronous head information to the data of the serial output of byte conversion module output Ge road QAM modulating mode by bit by symbol;
F2.QAM modulating mode tracking phase, synchronous head identification module is exported correct QAM modulating mode according to mode before, data synchronous head identification locking module by semaphore lock on correct QAM modulating mode;
G. path is selected, and when step f finds, after data synchronous head information, just the data of this discovery branch road to be outputed to de-interleaving block and carry out deinterleaving, and the relevant indication of each branch road is transported in data synchronous head identification locking module;
H. find synchronous head, data synchronous head identification locking module is according to the information output QAM modulating mode lock condition of synchronous head identification module;
I. determine QAM modulating mode, the final definite QAM modulating mode of data synchronous head identification locking module output;
J. finally export TS stream.
The invention has the beneficial effects as follows: the device and method of self adaptation identification and tracking synchronous head in cable digital TV of the present invention, have simple in structurely, realize advantage easily, and this device and method has exploitativeness widely.In addition, under blind mode condition, the present invention can effectively identify and tracking synchronous head information.
Accompanying drawing explanation
Fig. 1 is the block diagram of the identification of traditional self adaptation and tracking synchronous head device embodiment;
Fig. 2 is the block diagram of self adaptation identification of the present invention and tracking synchronous head device embodiment;
Fig. 3 is the flow chart of self adaptation identification of the present invention and tracking synchronous head embodiment of the method;
Fig. 4 is the block diagram of data demapping embodiment of the present invention;
Fig. 5 is that 16QAM of the present invention, 64QAM, 256QAM are for the demapping figure of first quartile;
Fig. 6 is that 32QAM of the present invention is for the demapping figure of first quartile;
Fig. 7 is that 128QAM of the present invention is for the demapping figure of first quartile.
Embodiment
Below, contrast accompanying drawing and preferred embodiment are elaborated to technical scheme of the present invention.
Referring to Fig. 1, in traditional self adaptation identification and tracking synchronous head device, as shown in the figure, its QAM modulating mode is known, and self adaptation identification and tracking synchronous head device carry out corresponding QAM demapping according to known QAM modulating mode.
Referring to Fig. 2, a device for self adaptation identification and tracking synchronous head in cable digital TV, comprises that data demapping module 201, phase rotating and the differential decoding module 202, the symbol that are linked in sequence wrap decoding module 207, descrambling code module 208, MPEG bit stream homogenizing module 209 to byte conversion module 203, synchronous head identification module 204, de-interleaving block 206, RS; Also comprise data synchronous head identification locking module 205, described phase rotating and differential decoding module 202 also have the second input, and described synchronous head identification module 205 also has the second output; The described data synchronous head identification input of locking module 205 and the second output of synchronous head identification module 204 are connected, and the output of described data synchronous head identification locking module 205 is connected with the second input of phase rotating and differential decoding module 202.
Described data demapping module 201, mainly completes the I of input, Q two paths of data is distinguished to demapping according to different QAM modulating modes, and by various demapping result parallel outputs.When forward error correction block starts, data demapping module is full QAM demapping; When module 205 data synchronous head identification locking module are exported correct pattern, module 201 is with correct QAM pattern demapping.
Described phase rotating and differential decoding module 202, be mainly used in phase rotating and differential decoding.
Described symbol, to byte conversion module 203, is chosen required Bit data for demapping result under different Q AM modulating mode, and by these Bit data combination byte serial output.The effective bit comprising due to its each symbol of different Q AM modulating mode is different, as shown in Fig. 4, Fig. 5, Fig. 6, Fig. 7.Although under different Q AM modulating mode, the output of demapping result is 8 bits, need to therefrom choose required Bit data, and then by these Bit data combination byte (8 bits) form serial output.
Described synchronous head identification module 204, for searching synchronous head " 47H " and " 184H " byte to the result bit-by-bit of byte conversion module serial output according to described symbol.After finding such one " accurate synchronous head ", every 204 bytes, continue to determine whether synchronous head information.So continuous judgement is repeatedly confirmed whether correctly to find data synchronous head information afterwards.
Described data synchronous head identification locking module 205, for judging which data of several circuit-switched data under QAM modulating mode correspondence have been found that synchronous head, and designation data demapping module 201 finds that with this corresponding QAM modulating mode in synchronous parting carries out demapping operation.During beginning, indicate full QAM pattern.
Described de-interleaving block 206, for carrying out deinterleaving operation to synchronous head identification module 204 correct Yi roads.De-interleaving block can be according to the output of RS blocks of data form serial or parallel, and 204 bytes are RS bag data.
Described RS decoding module 207, for according to different system standard, selects correct RS interpretation method to carry out decoding.In DVBC system, RS code is (255,239) shortened code.
Described descrambling code module 208, for carrying out descrambling code operation with frame form to the output of RS decoding module 207.
Described MPEG bit stream homogenizing module 209, for carrying out homogenizing processing to the TS stream of descrambling code module 208 outputs.According to the requirement of different mpeg stream decoding chips, the TS stream that mainly completes module 208 descrambling code module outputs carries out homogenizing processing, makes the mpeg stream homogenizing after processing, and its output clock has continuity.
Contrast, from Fig. 1 and Fig. 2, can be found out: Fig. 1 needs QAM pattern accurately, at Fig. 2, does not need QAM pattern accurately, thereby it carries out data synchronous head information to determine QAM pattern under blind form.In some specific situation, during as unknown QAM modulating mode, this patent is applicable to demand more.
Referring to Fig. 3, a kind of method of self adaptation identification and tracking synchronous head in cable digital TV, comprises the following steps:
S301. start: the register value of the relevant sub-module of initialization forward error correction block;
S302. receive data: control the I, the Q two paths of data that receive forward error correction block input;
S303. this step is divided into c1 and two stages of c2 according to QAM modulating mode identification situation:
C1.QAM modulating mode cognitive phase: symbol is respectively combined into byte form by the significant bit of phase rotating and differential decoding module output according to QAM modulating mode to byte conversion module and according to QAM modulating mode serial output separately;
C2.QAM modulating mode tracking phase: symbol to byte conversion module by the output of phase rotating and differential decoding module
Significant bit is combined into byte form serial output according to definite QAM modulating mode;
S304. phase rotating and differential decoding: to the output of data demapping module, select its high dibit to carry out differential decoding, according to QAM modulating mode identification situation, be divided into e1 and two stages of e2:
D1.QAM modulating mode cognitive phase: choose corresponding significant bit parallel output according to different Q AM modulating mode phase rotating and differential decoding module;
D2.QAM modulating mode tracking phase: phase rotating and differential decoding module are only exported the significant bit of determining QAM modulating mode;
S305. symbol is to the mapping of byte: according to QAM modulating mode identification situation, be divided into e1 and two stages of e2:
E1.QAM modulating mode cognitive phase: symbol is respectively combined into byte form by the significant bit of phase rotating and differential decoding module output according to QAM modulating mode to byte conversion module and according to QAM modulating mode serial output separately;
E2.QAM modulating mode tracking phase: symbol is combined into byte form serial output by the significant bit of phase rotating and the output of differential decoding module according to definite QAM modulating mode to byte conversion module;
S306. synchronous head detects: according to QAM modulating mode identification situation, be divided into f1 and two stages of f2:
F1.QAM modulating mode cognitive phase: synchronous head identification module is found synchronous head information to the data of the serial output of byte conversion module output Ge road QAM modulating mode by bit by symbol;
F2.QAM modulating mode tracking phase: synchronous head identification module is exported correct QAM modulating mode according to mode before; Data synchronous head identification locking module by semaphore lock on correct QAM modulating mode;
S307. path is selected: when step f finds, after data synchronous head information, just the data of this discovery branch road to be outputed to de-interleaving block and carry out deinterleaving, and the relevant indication of each branch road is transported in data synchronous head identification locking module;
S308. find synchronous head: data synchronous head identification locking module is according to the information output QAM modulating mode lock condition of synchronous head identification module;
S309. determine QAM modulating mode: the final definite QAM modulating mode of data synchronous head identification locking module output;
S310. finally export TS stream.
QAM modulating mode in above-mentioned step c comprises 16QAM, 32QAM, 64QAM, 128QAM and 256QAM.
Referring to Fig. 4, it is the block diagram of data demapping embodiment of the present invention.Fig. 5 is that 16QAM of the present invention, 64QAM, 256QAM are for the demapping figure of first quartile.Fig. 6 is that 32QAM of the present invention is for the demapping figure of first quartile.Fig. 7 is that 128QAM of the present invention is for the demapping figure of first quartile.
In sum, the invention discloses a kind of without under QAM modulation mode information prompting, a kind of device and method of self adaptation identification data synchronous head information, the present invention, by parallel demapping, judges respectively synchronous head information state, determines QAM modulating mode.And then with this pattern, carrying out the associative operations such as deinterleaving, decoding, this device and method is very simple and practical, and realizes conveniently.
Although above, in conjunction with embodiment, content of the present invention is explained; but be to be understood that; those skilled in the art is under the prerequisite without prejudice to principle of the present invention and connotation; to embodiments of the present invention, can make various distortion or modification, these distortion and modification all should fall into protection scope of the present invention.
Claims (8)
1. a device for self adaptation identification and tracking synchronous head in cable digital TV, comprises that data demapping module, phase rotating and the differential decoding module, the symbol that are linked in sequence wrap decoding module, descrambling code module, MPEG bit stream homogenizing module to byte conversion module, synchronous head identification module, de-interleaving block, RS;
It is characterized in that: also comprise data synchronous head identification locking module, described data demapping module has the second input, and described synchronous head identification module has the second output; The described data synchronous head identification input of locking module and the second output of synchronous head identification module are connected, and the output of described data synchronous head identification locking module is connected with the second input of data demapping module;
Wherein:
Described data demapping module mainly completes distinguishes demapping to the I of input, Q two paths of data according to different QAM modulating modes, and by various demapping result parallel outputs;
Described data synchronous head identification locking module is for judging which data of several circuit-switched data that different Q AM modulating mode is corresponding have been found that synchronous head, and the corresponding QAM modulating mode in road that designation data demapping module is found synchronous head place with this carries out demapping operation.
2. the device of self adaptation identification and tracking synchronous head in cable digital TV as claimed in claim 1, is characterized in that: described phase rotating and differential decoding module have been mainly used in phase rotating and differential decoding.
3. the device of self adaptation identification and tracking synchronous head in cable digital TV as claimed in claim 2, it is characterized in that: described symbol is chosen required Bit data to byte conversion module for demapping result under different Q AM modulating mode, and by these Bit data combination byte serial output.
4. the device of self adaptation identification and tracking synchronous head in cable digital TV as claimed in claim 3, it is characterized in that: described synchronous head identification module, for searching synchronous head " 47H " and " 184H " byte to the result bit-by-bit of byte conversion module serial output according to described symbol.
5. the device of self adaptation identification and tracking synchronous head in cable digital TV as claimed in claim 4, is characterized in that: described de-interleaving block is for carrying out deinterleaving operation to the correct Yi of synchronous head identification module road; Described RS bag decoding module, for according to different system standard, selects correct RS interpretation method to carry out decoding; Described descrambling code module is for carrying out descrambling code operation with frame form to the output of RS decoding module.
6. the device of self adaptation identification and tracking synchronous head in cable digital TV as claimed in claim 4, is characterized in that: described MPEG bit stream homogenizing module is for carrying out homogenizing processing to the TS stream of descrambling code module output.
7. a method for self adaptation identification and tracking synchronous head in cable digital TV, is characterized in that comprising the following steps:
A. initialization, carries out initialization to the register value of the relevant sub-module of forward error correction block;
B. receive data, control the I, the Q two paths of data that receive forward error correction block input;
C. data demapping module mainly completes the I of input, Q two paths of data is distinguished to demapping according to different QAM modulating modes, and by various demapping result parallel outputs, when forward error correction block starts, data demapping module is full QAM demapping; When data synchronous head identification locking module is exported correct pattern, data demapping module is with correct QAM pattern demapping;
D. phase rotating and differential decoding: to the output of data demapping module, select its high dibit to carry out differential decoding, according to QAM modulating mode identification situation, be divided into d1 and two stages of d2:
D1.QAM modulating mode cognitive phase: according to different Q AM modulating mode, phase rotating and differential decoding module are chosen corresponding significant bit parallel output;
D2.QAM modulating mode tracking phase, phase rotating and differential decoding module are only exported the significant bit of determining QAM modulating mode;
E. symbol, to the mapping of byte, is divided into e1 and two stages of e2 according to QAM modulating mode identification situation:
E1.QAM modulating mode cognitive phase: symbol is respectively combined into byte form by the significant bit of phase rotating and differential decoding module output according to QAM modulating mode to byte conversion module and according to QAM modulating mode serial output separately;
E2.QAM modulating mode tracking phase: symbol is combined into byte form serial output by the significant bit of phase rotating and the output of differential decoding module according to definite QAM modulating mode to byte conversion module;
F. synchronous head identification, according to QAM modulating mode, identification situation is divided into f1 and two stages of f2:
F1.QAM modulating mode cognitive phase: synchronous head identification module is found synchronous head information to the data of the serial output of byte conversion module output Ge road QAM modulating mode by bit by symbol;
F2.QAM modulating mode tracking phase: synchronous head identification module is by a circuit-switched data output corresponding to correct QAM modulating mode; Data synchronous head identification locking module by semaphore lock on correct QAM modulating mode;
G. path is selected, and when step f finds, after data synchronous head information, just the data of this discovery branch road to be outputed to de-interleaving block and carry out deinterleaving, and the relevant indication of each branch road is transported in data synchronous head identification locking module;
H. find synchronous head, data synchronous head identification locking module is according to the information output QAM modulating mode lock condition of synchronous head identification module;
I. determine QAM modulating mode, the final definite QAM modulating mode of data synchronous head identification locking module output is to data demapping module;
J. finally export TS stream.
8. the method for self adaptation identification and tracking synchronous head in cable digital TV as claimed in claim 7, is characterized in that: the QAM modulating mode in described step c comprises 16QAM, 32QAM, 64QAM, 128QAM and 256QAM.
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| CN1735219A (en) * | 2005-06-13 | 2006-02-15 | 深圳创维－Rgb电子有限公司 | Device and method for recognizing signal |
| CN101296357A (en) * | 2007-04-27 | 2008-10-29 | 上海芯致电子科技有限公司 | Scheme for simplifying authorization receiving chip |
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| CN1735219A (en) * | 2005-06-13 | 2006-02-15 | 深圳创维－Rgb电子有限公司 | Device and method for recognizing signal |
| CN101296357A (en) * | 2007-04-27 | 2008-10-29 | 上海芯致电子科技有限公司 | Scheme for simplifying authorization receiving chip |
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