CN101567869B - Method and device for analyzing CMMB standard mobile television - Google Patents
Method and device for analyzing CMMB standard mobile television Download PDFInfo
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- CN101567869B CN101567869B CN 200810094064 CN200810094064A CN101567869B CN 101567869 B CN101567869 B CN 101567869B CN 200810094064 CN200810094064 CN 200810094064 CN 200810094064 A CN200810094064 A CN 200810094064A CN 101567869 B CN101567869 B CN 101567869B
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Abstract
The invention provides a method and a device for analyzing a CMMB standard mobile television. The method comprises the following steps: judging whether a service time slot of currently received signals is a target service time slot or not, analyzing the service time slot to obtain analyzing data, and supplying the analyzing data to subsequent demodulating and decoding treatment. The invention saves system resources.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of analytic method and device for CMMB (ChinaMobile Multimedia Broadcasting, China Mobile multimedia broadcasting) standard mobile television.
Background technology
Mobile TV is the business of watching TV with the mobile phone with video support function.At present, the realization of mobile phone TV services mainly contains three approach: the technology that realizes of (1) movement-based network.The mobile phone TV services of the U.S. and China operator release at present are mainly to rely on existing mobile network to realize.In China, China Mobile and CHINAUNICOM are all respectively based on its GPRS (General Packet Radio Service, GPRS) network and CDMA (Code Division Multiple Access, code division multiple access) 1X network utilizes the mobile flow medium technology to release mobile phone TV services.(2) the satellite-based technology that realizes.The essence of this class technology is exactly that downlink transfer is provided via satellite, realizes the mobile phone TV services of broadcast mode, and the user just can realize the reception of multi-medium data by the module of integrated direct receiving satellite signal on mobile phone terminal.Typical technology comprises S-DVB (the Satellite-Digital Video Broadcasting in Europe, digital video broadcast-satellite) and the S-DMB of Japan and Korea S (Satellite-Digital Multimedia Broadcasting, digital multimedia broadcast (dmb) via satellite) etc.(3) based on the technology that realizes of received terrestrial digital broadcasting net.This type of realizes that technology mainly produces for the received terrestrial digital broadcasting TV, and the frequency of use is generally the radio and television frequency range.
CMMB is China Mobile multimedia broadcasting, is proposed by State Administration of Radio Film and Television, is promulgated in October, 2006 to be industry standard.It adopts the high-power satellite of S-band to augment with frequency the technical system that network combines with ground, and One-to-All Broadcast and two-way interaction combine, and realizes that national Incorporate covers, whole nation roaming.This standard is applicable in 30Mhz～3000Mhz frequency range, via satellite or the broadcast system of the multi-media signals such as terrestrial wireless emission TV, broadcasting, data message.
In realizing process of the present invention, the inventor finds that in prior art, there are the following problems at least: carry out to received signal before demodulation, decoding etc. process at the mobile TV receiving terminal in present mobile TV system, still do not have special setting device that data are resolved, and just synchronously process to received signal.Like this, concerning the data processing module of rear class, must first carry out primary screening to data, choose valid data, and judge whether each time slot is the time slot at target service place, and this certainly will increase the complexity of processing.
Summary of the invention
The present invention aims to provide a kind of analytic method for the CMMB standard mobile television and device, processes complicated problem to solve when the mobile TV receiving terminal carries out demodulation, decoding to received signal.
In an embodiment of the present invention, provide a kind of analytic method for the CMMB standard mobile television, comprised the steps: to judge that the business time-slot of the current signal that receives is the target service time slot; Resolve business time-slot to obtain resolution data; Resolution data is offered follow-up demodulating and decoding to be processed.
Preferably, the business time-slot of the current signal that receives of judgement is that the target service time slot specifically comprises: receive signal; Determine the original position of the business time-slot of arriving signal according to default parameter; Setting is business time-slot from the time slot of the predetermined length that original position begins; Judge according to default parameter whether business time-slot is the target service time slot.
Preferably, also comprise: the position that arranges after business time-slot is the original position of next business time-slot.
Preferably, resolving business time-slot specifically comprises to obtain resolution data: read following one of at least to consist of resolution data from business time-slot: the valid data body of beacon, OFDM symbol, protection interval.
Preferably, resolving business time-slot specifically comprises to obtain resolution data: determine business start mark, time slot start mark, symbol start mark according to counter and default parameter; According to business start mark, time slot start mark, symbol start mark determine beacon, OFDM symbol the valid data body, the protection interval; Determine that according to counter and default parameter in each valid data body, first clock of data is exported data significant notation; Determine according to first clock output data significant notation of data in each valid data body whether resolution data is valid data.
In an embodiment of the present invention, also provide a kind of resolver for the CMMB standard mobile television, it is characterized in that, having comprised: the timing calculator modules is used for completing parsing and the data phase timing of data component in time slot; Data screening device module is used for completing the data of CMMB standard are screened, for the rear class data processing module provides Data Analysis information; Controller module is used for completing the control function to timer conter module and data screening device module; The system interaction module is used for completing mutual with software systems.
Preferably, regularly calculator modules specifically comprises: the beacon counter unit is used for completing the timing first valid data from the time slot original position to time slot; The symbol data counter unit is for the length timing of the valid data body of completing each OFDM symbol; The symbolic number counter unit is used for completing the symbolic number timing of each time slot; The interval counter unit is used for completing the invalid data length timing between every two valid data bodies.
Preferably, regularly calculator modules also comprises: data phase timer conter unit is used for completing the phase bit timing of each data.
Preferably, data screening device module specifically comprises: business start mark unit is used for completing the start mark of each business; Time slot start mark unit is for the start mark of each time slot in finishing service; Symbol start mark unit is for the start mark of each the OFDM symbol in finishing service; Data significant notation unit is for the mark of completing each valid data.
Preferably, controller module specifically comprises: counter control unit, be used for completing to the startup of the individual count device unit of timing calculator modules with close; The local control signal generation unit is used for completing the generation of local control signal.
Preferably, the system interaction module specifically comprises: the parameter receiving element is used for the reception of the parameters that software assigns; The information reporting unit is used for completing to the residing position of software reporting interruption generation moment hardware; Interruption reports the unit, is used for completing in each time slot original position to the software reporting interruption, for software provides regularly.
Above embodiment is because the method that adopts valid data to received signal to screen, be the finished dealing with parsing of data of the data of back, process complicated problem so overcome when the mobile TV receiving terminal carries out demodulation, decoding to received signal, and then reached the effect of conserve system resources.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows the flow chart according to the analytic method that is used for the CMMB standard mobile television of the embodiment of the present invention;
Fig. 2 shows the flow chart according to the analytic method that is used for the CMMB standard mobile television of the preferred embodiment of the present invention one;
Fig. 3 shows the flow chart according to the analytic method that is used for the CMMB standard mobile television of the preferred embodiment of the present invention two;
Fig. 4 shows the flow chart that interrupts losing according to the preferred embodiment of the invention conservation treatment;
Fig. 5 shows the block diagram according to the resolver that is used for the CMMB standard mobile television of the embodiment of the present invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 shows the flow chart according to the analytic method that is used for the CMMB standard mobile television of the embodiment of the present invention, comprises the steps:
Step S10, the business time-slot that judges the current signal that receives is the target service time slot;
Step S20 resolves business time-slot to obtain resolution data;
Step S30 offers follow-up demodulating and decoding with resolution data and processes.
Above embodiment is because the method that adopts valid data to received signal to screen, be the finished dealing with parsing of data of the data of back, process complicated problem so overcome when the mobile TV receiving terminal carries out demodulation, decoding to received signal, and then reached the effect of conserve system resources.
Preferably, the business time-slot of the current signal that receives of judgement is that the target service time slot specifically comprises: receive signal; Determine the original position of the business time-slot of arriving signal according to default parameter; Setting is business time-slot from the time slot of the predetermined length that original position begins; Judge according to default parameter whether business time-slot is the target service time slot.
In the preferred embodiment, when judging according to default parameter whether business time-slot is the target service time slot, only have a parameter, software only needs to provide the judgement symbol of to get final product to hardware, for example, the 0 non-target service time slot of expression, 1 expression target service time slot.)
Preferably, also comprise: the position that arranges after business time-slot is the original position of next business time-slot.
Preferably, resolving business time-slot specifically comprises to obtain resolution data: read following one of at least to consist of resolution data from business time-slot: the valid data body of beacon, OFDM symbol, protection interval.
Preferably, resolving business time-slot specifically comprises to obtain resolution data: determine business start mark, time slot start mark, symbol start mark according to counter and default parameter; According to business start mark, time slot start mark, symbol start mark determine beacon, OFDM symbol the valid data body, the protection interval; Determine that according to counter and default parameter in each valid data body, first clock of data is exported data significant notation; Determine according to first clock output data significant notation of data in each valid data body whether resolution data is valid data.
Beacon in the preferred embodiment is positioned at the initial of a time slot, and after previous time slot finished, ensuing was exactly the beacon of next time slot.Specifically can be with reference to the CMMB agreement)
Fig. 2 shows the flow chart according to the analytic method that is used for the CMMB standard mobile television of the preferred embodiment of the present invention one, comprises the steps:
Step S201: the arrival of the original position of latency services time slot;
Step S202: when arriving the original position of business time-slot, reporting interruption, simultaneously, the parameter that reading software is assigned;
Step S203: according to the parameter that software is assigned, judge whether the data of this time slot are exported, do not return to the first step if this time slot is not the target service time slot; If this time slot is the target service time slot, the initiation beacon counter, begin Data Analysis;
Step S204: resolved last OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) symbol, this business time-slot Data Analysis finishes, and returns to the first step.
The data of the method rear class of above preferred embodiment one are processed and can directly be carried out the data processing according to the Data Analysis information of device output of the present invention, need not again data to be carried out timing, make system configuration simpler, clear, have saved system resource.
Fig. 3 shows the flow chart according to the analytic method that is used for the CMMB standard mobile television of the preferred embodiment of the present invention two, comprises the steps:
Step S301 waits for the original position that arrives business time-slot;
Step S302, when arriving the original position of business time-slot, reporting interruption, simultaneously, and the parameter that reading software is assigned, the value of the business time-slot original position that software is assigned is for reading in real time, and other parameters all read herein;
Step S303 according to the parameter that software is assigned, judges that whether this time slot is the target service time slot, if this time slot is not the target service time slot, returns to step S301;
Step S304, the initiation beacon counter;
Step S305 judges whether beacon counter closes; When beacon counter is closed, start symbol counter and symbolic number counter; Simultaneously, output time solt start mark and symbol start mark; And according to the parameter that software is assigned, judge whether the outgoing traffic start mark; Simultaneously, first clock output data significant notation of neat each data of mark.
Step S306 when symbol counter is closed, starts interval counter, and all Data Analysis marks are not exported;
Step S307 when interval counter is closed, starts symbol counter, simultaneously, and output symbol start mark, and first clock output data significant notation of neat each data of mark;
Step S308, repeating step S106 and step S107, the up-to symbol counter is write 53 symbols (time slot comprises 53 OFDM symbols) all over;
Step S309 has resolved the 53rd OFDM symbol, indicates that this time slot Data Analysis is complete, returns to step S101, waits for the beginning of next target service time slot.
Above preferred embodiment two is because the method that adopts valid data to received signal to screen, completed the parsing of data for the data processing module of back, process complicated problem so overcome when the mobile TV receiving terminal carries out demodulation, decoding to received signal, and then reached the effect of conserve system resources.
Fig. 4 shows the flow chart that interrupts losing according to the preferred embodiment of the invention conservation treatment, comprises the steps:
Step a1 judges whether to arrive the business time-slot original position according to local register A;
Step a2, when arriving the business time-slot original position, with the value of local register A from the length (25ms) that adds a time slot, as the original position of next time slot;
Step a3 judges whether this time slot data are the target service time slot;
Step a4 begins the Data Analysis of this time slot, described in the idiographic flow of Data Analysis such as embodiment two;
Step a5, this time slot Data Analysis is complete, returns to a1;
Step b1, the business time-slot start bit that judgement software is assigned is not equipped with to be upgraded;
Step b2, if the start bit of business time-slot is equipped with renewal, the original position after upgrading is assigned to local register A, covers the original value of A; If do not upgrade, the value of A is constant.
Need to prove, the business time-slot original position that device of the present invention is assigned software reads in real time, and is all to read when being unified in arrival business time-slot original position to other parameters that software is assigned.A in Fig. 5 and b are two parallel processes.
Above embodiment provides the interruption protection mechanism, if software does not respond interruption, does not assign the original position of next time slot, and this device can upgrade the original position of time slot automatically, carries out the parsing of next time slot data, avoids sporadic accident to cause systemic breakdown.This interruption protection mechanism is also provided convenience for the design of software; when software needs hardware to process the business of a plurality of time slots continuously; the original position that only need assign first time slot gets final product; this device will guarantee the continuous wave output of a plurality of time slot data resolving informations automatically, thereby guarantee the continuous decoding of hardware system.
Fig. 5 shows the block diagram according to the resolver that is used for the CMMB standard mobile television of the embodiment of the present invention, comprising:
Regularly calculator modules, be used for completing parsing and the data phase timing of data component in time slot;
Data screening device module is used for completing the data of CMMB standard are screened, for the rear class data processing module provides Data Analysis information;
Controller module is used for completing the control function to timer conter module and data screening device module;
The system interaction module is used for completing mutual with software systems.
Above embodiment is because the method that adopts valid data to received signal to screen, completed the parsing of data for the data processing module of back, process complicated problem so overcome when the mobile TV receiving terminal carries out demodulation, decoding to received signal, and then reached the effect of conserve system resources.
Preferably, regularly calculator modules specifically comprises: the beacon counter unit is used for completing the timing first valid data from the time slot original position to time slot; The symbol data counter unit is for the length timing of the valid data body of completing each OFDM symbol; The symbolic number counter unit is used for completing the symbolic number timing of each time slot; The interval counter unit is used for completing the invalid data length timing between every two valid data bodies.
Preferably, regularly calculator modules also comprises: data phase timer conter unit is used for completing the phase bit timing of each data.
The timing calculator modules of the preferred embodiment defines according to the physical layer frame structure of CMMB prescribed by standard and the sample frequency of data for the length of the counter of completing the data component parsing.The length that comprises a TxID (identification signal of transmitter), two synchronizing symbols, two GI (protection interval) and CP (Cyclic Prefix) such as the length of beacon counter; be 501.6 μ s altogether; if the sampling point frequency is 10MHz, the length of beacon counter is 501.6 μ s * 10MHz=5016 so.Decided counter length=clock frequency/data frequency by clock frequency used and data frequency for the length of completing data phase counter regularly.
Preferably, data screening device module specifically comprises: business start mark unit is used for completing the start mark of each business; Time slot start mark unit is for the start mark of each time slot in finishing service; Symbol start mark unit is for the start mark of each the OFDM symbol in finishing service; Data significant notation unit is for the mark of completing each valid data.
In the data screening device module of the preferred embodiment, the composition of Data Analysis information defines according to the demand of system.Such as time slot original position mark is positioned at the initial of beacon or is positioned at valid data body initial of first OFDM symbol, system can conveniently deciding according to its global design.
Preferably, controller module specifically comprises: counter control unit, be used for completing to the startup of the individual count device unit of timing calculator modules with close; The local control signal generation unit is used for completing the generation of local control signal.
The controller module of the preferred embodiment is used for completing the control to timer conter module, data screening device module and system interaction module.In controller module, the formation of various control signals mainly decides according to function realization and the sequential demand of other three modules.
Preferably, the system interaction module specifically comprises: the parameter receiving element is used for the reception of the parameters that software assigns; The information reporting unit is used for completing to the residing position of software reporting interruption generation moment hardware; Interruption reports the unit, is used for completing in each time slot original position to the software reporting interruption, for software provides regularly.
The system interaction module of the preferred embodiment is used for completing mutual with software systems, comprises the reception of the parameters that software is assigned, to the software reporting information and to the software reporting interruption.The parameter that software is assigned mainly contains: the business time-slot original position, whether be the target service time slot, whether be the initial time slot of business etc.If the residing position of the information spinner that reports interruption generation timer, being equivalent to provides regularly for software.
The analytic method that is used for the CMMB standard mobile television that above embodiment provides and device valid data to received signal screen, and have completed the parsing of data for the data processing module of back.All Timing Processing are focused on device of the present invention, make system configuration simpler, clear, saved system resource.Protection mechanism is lost in interruption provided by the invention, and the assurance system can not enter state of paralysis when sporadic accident occurring; Simultaneously, it is also provided convenience for the design of software, and when software needed hardware to process the business of a plurality of time slots continuously, the original position that only need assign first time slot got final product, and this device will guarantee the continuous wave output of a plurality of time slot data resolving informations automatically.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. an analytic method that is used for the CMMB standard mobile television, is characterized in that, comprises the steps:
The business time-slot that judges the current signal that receives is the target service time slot, and wherein, this step specifically comprises: receive described signal; Determine the original position of the described business time-slot of the described signal of arrival according to default parameter; Setting is described business time-slot from the time slot of the predetermined length that described original position begins; Judge according to default parameter whether described business time-slot is the target service time slot;
Resolve described business time-slot to obtain resolution data, wherein, this step specifically comprises: determine business start mark, time slot start mark, symbol start mark according to counter and default parameter; According to described business start mark, described time slot start mark, described symbol start mark determine beacon, OFDM symbol the valid data body, the protection interval; Determine that according to described counter and described default parameter in each described valid data body, first clock of data is exported data significant notation; In valid data body according to each, first clock output data significant notation of data determines whether resolution data is valid data;
Described resolution data is offered follow-up demodulating and decoding to be processed.
2. analytic method according to claim 1, is characterized in that, also comprises:
The position that arranges after described business time-slot is the original position of next business time-slot.
3. analytic method according to claim 1, is characterized in that, resolves described business time-slot and specifically comprise to obtain resolution data:
Read following one of at least to consist of described resolution data from described business time-slot: the valid data body of beacon, OFDM symbol, protection interval.
4. a resolver that is used for the CMMB standard mobile television, is characterized in that, comprising:
Data screening device module is used for judging whether the business time-slot of the current signal that receives is the target service time slot, and wherein, described data screening device module specifically is used for receiving described signal; Determine the original position of the described business time-slot of the described signal of arrival according to default parameter; Setting is described business time-slot from the time slot of the predetermined length that described original position begins; Judge according to default parameter whether described business time-slot is the target service time slot;
The timer conter module, be used for parsing and the data phase timing of data component in described business time-slot, to obtain resolution data, wherein, described timer conter module specifically is used for determining business start mark, time slot start mark, symbol start mark according to counter and default parameter; According to described business start mark, described time slot start mark, described symbol start mark determine beacon, OFDM symbol the valid data body, the protection interval; Determine that according to described counter and described default parameter in each described valid data body, first clock of data is exported data significant notation; In valid data body according to each, first clock output data significant notation of data determines whether resolution data is valid data;
Described data screening device module is used for that also described resolution data is offered follow-up demodulating and decoding and processes;
Controller module is used for completing the control function to timer conter module and data screening device module.
5. resolver according to claim 4, is characterized in that, the timer conter module specifically comprises:
The beacon counter unit is used for completing from the time slot original position to the timing first valid data of described time slot;
The symbol data counter unit is for the length timing of the valid data body of completing each OFDM symbol;
The symbolic number counter unit is used for completing the symbolic number timing of each time slot;
The interval counter unit is used for completing the invalid data length timing between every two valid data bodies.
6. resolver according to claim 4, is characterized in that, the timer conter module also comprises:
Data phase timer conter unit is for the phase bit timing of completing each data.
7. resolver according to claim 4, is characterized in that, data screening device module specifically comprises:
Business start mark unit is for the start mark of completing each business;
Time slot start mark unit is for the start mark of completing each time slot in described business;
Symbol start mark unit is for the start mark of completing each the OFDM symbol in described business;
Data significant notation unit is for the mark of completing each valid data.
8. resolver according to claim 4, is characterized in that, controller module specifically comprises:
Counter control unit, be used for completing to the startup of the individual count device unit of described timer conter module with close;
The local control signal generation unit is used for completing the generation of local control signal.
9. resolver according to claim 4, is characterized in that, also comprises the system interaction module, is used for completing mutual with software, and wherein, the system interaction module specifically comprises:
The parameter receiving element is used for completing the reception of the parameters that described software assigns;
The information reporting unit is used for completing to the residing position of described software reporting interruption generation moment hardware;
Interruption reports the unit, is used for completing in each time slot original position to described software reporting interruption, for described software provides regularly.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7003062B1 (en) * | 2001-02-14 | 2006-02-21 | Cisco Systems Canada Co. | Method and system for distribution of clock and frame synchronization information |
| CN1972391A (en) * | 2006-03-30 | 2007-05-30 | 北京新岸线软件科技有限公司 | Grounding mobile multimedia broadcasting receiver compatible with digital audio broadcasting |
| CN101022604A (en) * | 2007-03-20 | 2007-08-22 | 中兴通讯股份有限公司 | Mobile multimedia broadcasting receiving method and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7003062B1 (en) * | 2001-02-14 | 2006-02-21 | Cisco Systems Canada Co. | Method and system for distribution of clock and frame synchronization information |
| CN1972391A (en) * | 2006-03-30 | 2007-05-30 | 北京新岸线软件科技有限公司 | Grounding mobile multimedia broadcasting receiver compatible with digital audio broadcasting |
| CN101022604A (en) * | 2007-03-20 | 2007-08-22 | 中兴通讯股份有限公司 | Mobile multimedia broadcasting receiving method and device |
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Effective date of registration: 20151127 Address after: 518057 Nanshan District Guangdong high tech Industrial Park, South Road, science and technology, ZTE building, Ministry of Justice Patentee after: ZTE Corp. Patentee after: SANECHIPS TECHNOLOGY Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong high tech Industrial Park, ZTE building Patentee before: ZTE Corp. |
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