CN106060645A - Method and device for Chinese digital audio broadcasting demultiplexing - Google Patents
Method and device for Chinese digital audio broadcasting demultiplexing Download PDFInfo
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- CN106060645A CN106060645A CN201610371529.3A CN201610371529A CN106060645A CN 106060645 A CN106060645 A CN 106060645A CN 201610371529 A CN201610371529 A CN 201610371529A CN 106060645 A CN106060645 A CN 106060645A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4341—Demultiplexing of audio and video streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/488—Data services, e.g. news ticker
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
The present invention relates to a method for Chinese digital audio broadcasting demultiplexing, comprising: performing parse of the CDR transmission flow data after demodulation, and obtaining a business multiplexing frame (SMF) data and a control multiplexing frame (CMF) data, wherein the SMF data carries audio packet for audio broadcast business and a data packet for other application business, and the CMF data carries the control information; parsing the CMF data to obtain the control information; performing data filtering according to the control information, wherein the data filtering result is configured to parse the SMF data; and parsing the SMF data through the data filtering result, and obtaining the audio data included in the audio packet and the application data included in the data packet. The method and device for Chinese digital audio broadcasting demultiplexing obtains control information through parsing of the control multiplexing frame and parses the business multiplexing frame according to the information so as to effectively realize the demultiplexing of the CDR data flow through the receiving terminal with an operation system.
Description
Technical field
The present invention relates to broadcast communication system, particularly relate to a kind of Chinese Digital audio broadcasting (China Digital
Radio, CDR) method and apparatus that demultiplexes.
Background technology
Analog broadcasting technology (using FM frequency modulation) is as the history of current main flow station broadcast existing decades, for letter
The transmission of breath played an important role.But along with popularizing of automobile, station broadcast day by day receives publicity, and frequency resource is increasingly
Anxiety, broadcast technology digitized is extremely urgent.For this demand, China has issued series digit broadcast standard GY/T 268,
It is called for short CDR (Chinese Digital audio broadcasting).It is wide that digital broadcast technologies can support to be several times as much as simulation under identical frequency points
Broadcast the transmission number of program under technology.And be possible not only to transmit audio voice information, it is also possible to transmission digital information, for not
By functional realiey and the terminal form of level.These information first will be multiplexed into a number according to certain standard in digital broadcasting.
According to stream, re-modulation is launched.The data stream after resolving this multiplexing is then needed at receiving terminal.
Summary of the invention
It is an object of the invention to provide a kind of can overcome prior art drawback for Chinese Digital audio broadcasting demultiplexing
Method and apparatus.
In first aspect, the invention provides a kind of Deplexing method for Chinese Digital broadcast audio CDR, its feature
It is, including: the transmission flow data of the CDR after demodulation is resolved, obtains service integration frame SMF data and control multiplexed frame
CMF data, described SMF data carry the audio pack for audio broadcast services and the packet for other applied business, institute
State CMF data and carry control information；Resolve to obtain described control information to described CMF data；Letter is controlled according to described
Breath carries out data filtering, and data filtering result is for controlling the parsing to SMF data；According to described data filtering result to described
SMF data resolve, and obtain the application data comprised in the voice data that comprises in described audio pack or described packet.
Preferably, the step that described CMF data resolve to obtain described control information includes: obtain CMF frame head
Length；Judge whether described CMF frame head length is valid lengths；In the case of the described a length of valid lengths of CMF frame head, root
Read cyclic redundancy check (CRC) data according to CMF frame head length and carry out CRC check；In the case of CRC check is correct, read
Information in described CMF frame head；The information resolved in CMF frame head obtains period service duplexing configuration list；Resolve described service integration to join
Put table, obtain described control information.
Preferably, the step carrying out data filtering according to described control information includes: according to service identification, in service lists
In carry out reverse indexing, obtain described data filtering result, described data filtering result includes service integration frame identification and business
Multiplexed sub frame sequence number；Wherein, described control information includes that service lists, described service lists include multiple service integration frame mark
Know, the corresponding multiple service integration subframe sequence numbers of each service integration frame identification and multiple service identification, each service integration subframe
The corresponding service identification of sequence number.
Preferably, the step resolved described SMF data according to described data filtering result includes: according to multiplexing
Frame length list and described control acquisition of information multiplexed sub frame data, wherein, described multiplexed sub frame length list is by resolving SMF
Frame head obtains；Described subframe head is verified by the subframe head length obtaining described multiplexed sub frame data；Correct in described verification
In the case of, resolve described subframe head and obtain instruction information；According to described instruction information and described control information to described audio frequency
Bag or described packet resolve, and obtain the voice data for audio broadcast services or the application for other applied business
Data.
Preferably, in the case of the result verifying described subframe head is incorrect: SMF frame is synchronized；Obtain
Take SMF frame head length；Judge whether SMF frame head length is valid lengths；In the case of a length of valid lengths of SMF frame head,
Read cyclic redundancy check (CRC) data according to SMF frame head length and carry out CRC check；In the situation that described CRC check is correct
Under, resolve SMF frame head and obtain described multiplexed sub frame length list.
In second aspect, the invention provides a kind of for Chinese Digital broadcast audio CDR Deplexing apparatus, its feature exists
In, including: transmission stream parsing module, for the transmission flow data of the CDR after demodulation is resolved, obtain service integration frame
SMF data and control multiplexed frame CMF data, described SMF data are carried for the audio pack of audio broadcast services with for other
The packet of applied business, described CMF data carry control information；CMF data resolution module, for entering described CMF data
Row resolves to obtain described control information；Resolve control module, for carrying out data filtering, data mistake according to described control information
Filter result is for controlling the parsing to SMF data；SMF data resolution module, under the control in parsing control module, according to
Described SMF data are resolved by described data filtering result.
Preferably, described parsing control module specifically for: obtain CMF frame head length；Judge that described CMF frame head length is
No for valid lengths；In the case of the described a length of valid lengths of CMF frame head, read cyclic redundancy according to CMF frame head length
Check (CRC) data also carry out CRC check；In the case of CRC check is correct, read the information in described CMF frame head；Resolve
Information in CMF frame head obtains period service duplexing configuration list；Resolve described period service duplexing configuration list, obtain described control information.
Preferably, described CMF data resolution module specifically for: according to service identification, carry out reversely in service lists
Index, obtains described data filtering result, and described data filtering result includes service integration frame identification and service integration subframe sequence
Number；Wherein, described control information includes that service lists, described service lists include multiple service integration frame identification, Mei Geye
Business multiplexed frame identifies corresponding multiple service integration subframe sequence numbers and multiple service identification, each service integration subframe sequence number correspondence one
Individual service identification.
Preferably, described SMF data resolution module specifically for: according to multiplexed sub frame length list and described control information
Obtaining multiplexed sub frame data, wherein, described multiplexed sub frame length list obtains by resolving SMF frame head；Obtain described multiplexing
Described subframe head is verified by the subframe head length of frame data；In the case of described verification is correct, resolve described subframe head
Obtain instruction information；According to described instruction information and described control information, described audio pack or described packet are resolved,
Obtain the voice data for audio broadcast services or the application data for other applied business.
Preferably, in the case of the result verifying described subframe head is incorrect: SMF frame is synchronized；Obtain
Take SMF frame head length；Judge whether SMF frame head length is valid lengths；In the case of a length of valid lengths of SMF frame head,
Read cyclic redundancy check (CRC) data according to SMF frame head length and carry out CRC check；In the situation that described CRC check is correct
Under, resolve SMF frame head and obtain described multiplexed sub frame length list.
The present invention is by obtaining control information to the parsing controlling multiplexed frame, and according to this control information to service integration frame
Resolve, the demultiplexing of CDR data stream under the reception terminal with operating system, can be realized efficiently.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of CDR demultiplexing thread according to embodiments of the present invention.
Fig. 2 is the schematic block diagram of CDR Deplexing apparatus according to embodiments of the present invention.
Fig. 3 is the functional flow diagram of the SMF data resolution module in CDR Deplexing apparatus according to embodiments of the present invention.
Fig. 4 is the functional flow diagram of the CMF data resolution module in CDR Deplexing apparatus according to embodiments of the present invention.
Fig. 5 is the functional flow diagram of the parsing control module in CDR Deplexing apparatus according to embodiments of the present invention.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
Fig. 1 is the schematic diagram of CDR demultiplexing thread according to embodiments of the present invention.
In the present invention, it is assumed that demodulation module output interface by service integration frame (Service Multiplex Frame,
SMF) and control multiplexed frame according to (Control Multiplex Frame, CMF) according to transmission stream (Transport Stream,
TS) rule is multiplexed with a circuit-switched data output, gives SMF, CMF different Process identifier (Process respectively
Identification, PID) distinguished.
As it is shown in figure 1, receive terminal for CDR, to playing program or obtaining its of CDR after demodulation module demodulates
His application transport data, comprise five threads, are performed by functional module corresponding in Fig. 1 respectively.
Specifically, TS data stream is resolved by thread 1 by TS stream parsing module, and thread 2 is flowed parsing module pair by SMF
SMF data stream resolves, and CMF data stream is resolved by thread 3 by CMF stream parsing module, and thread 4 is decoded by voice data
Voice data in SMF data is decoded and plays by playing module, thread 5 by other data resolution modules to SMF data
In other data resolve.The concurrent working from the time of these threads, and its mutual relation and data are walked and are upwards had
There is the structure shown in Fig. 2.
Fig. 2 is the schematic block diagram of CDR Deplexing apparatus according to embodiments of the present invention.
As it is shown in figure 1, TS data store Buffer, (" storage Buffer " in the specification and drawings means that " buffering is deposited
Reservoir ") output that receives demodulation module goes forward side by side row cache, and TS stream parsing module reads TS fluxion from TS data storage Buffer
According to and it is resolved, obtain service integration frame SMF data and control multiplexed frame CMF data.
It is the core texture of the Deplexing apparatus according to the embodiment of the present invention in the large-block schema of center, mainly includes three portions
Point: perform the SMF data resolution module of thread 2, perform the CMF data resolution module of thread 3 and resolve control module.Separately
Outward, thread 4 by voice data decoding playing module complete, thread 5 by other data in SMF data corresponding application program complete
Become, be not related to the emphasis of the present invention, do not repeat.
Thread 1 is filtered out PID1 and PID2 two paths of data and makees write operation, will SMF data and CMF data delay respectively
Exist in SMF data storage Buffer and CMF data storage Buffer.SMF data resolution module and CMF data resolution module divide
Read operation corresponding SMF data and CMF data be Tong Guo not read, and thread 2 and thread 3, i.e. SMF data parsing performed respectively
With CMF data parsing.
Resolve, via SMF data resolution module, the voice data obtained and other data are respectively stored in by write operation
In voice data storage Buffer and other data storage Buffer.Then, voice data is decoded playing module by voice data
It is read out by read operation and plays to user；Other data storage Buffer is passed through read operation by other data resolution modules
Being read out and resolve, analysis result exports other application of correspondence.
The information obtained, such as frequency and business information etc., output to mutual mould is resolved via CMF data resolution module
Block, the information obtained by the parsing of CMF data resolution module and the common of information obtained alternately with user are acted on, mutual mould
Result is exported parsing control module by block.Resolve the control module data according to input, obtain controlling SMF data resolution module
Data filtering result, in case SMF data resolution module use.
Fig. 3 is the functional flow diagram of the SMF data resolution module in CDR Deplexing apparatus according to embodiments of the present invention.
SMF data mainly carry the audio pack for audio broadcasting, and the packet of other application.As it is shown on figure 3, pass through
Data Storage, SMF data resolution module reads its audio pack carried and data from SMF data storage Buffer
Bag, carries out SMF data parsing under the control resolving control module.
First, obtain, according to multiplexed sub frame length list, the multiplexed sub frame data that parsing control module is formulated.It follows that obtain
Take this multiplexed sub frame head length this subframe head is verified.According to check results, flow process is divided into two-way.
The first via, in the case of verification is correct, execution the following step:
Resolve by the subframe head of verification, to obtain instruction information, including: whether this multiplexed sub frame contains audio frequency
Whether section and length, this multiplexed sub frame contain data segment and length thereof, encapsulation mode indicates, whether this multiplexed sub frame contains exhibition
District and data thereof.
If this multiplexed sub frame contains audio section and resolves control module and require the business of this audio section, then to this audio frequency
Duan Jinhang resolves, and resolves resolving the audio unit obtained, and resolves resolving the data block obtained, finally gives sound
Frequency evidence；If this multiplexed sub frame contains data segment (other data in Fig. 2) and resolves control module and require this data segment
Business, then this data segment is resolved, resolves resolving the data cell that obtains, enter resolving the data block obtained
Row resolves, and finally gives other data.
The voice data obtained by above-mentioned parsing is stored in voice data storage Buffer, and other data can be wrapped
Include such as datacast data, electron service instruction (Electronic Service Guide, ESG) data, urgent broadcast number
According to etc data, use for other corresponding application.
Second tunnel, in the case of check errors, execution the following step:
SMF frame is synchronized, obtains SMF frame head length SMFheader_length, it is judged that whether SMF frame head length is
Valid lengths.
It is not valid lengths such as it, then re-executes the synchronization of SMF frame；If SMF frame head is valid lengths, then read
Data block CRC_data of SMF frame head+4 bytes of length, and it is carried out CRC check.
Such as CRC check mistake, then re-execute the synchronization of SMF frame；If CRC check is correct, then SMF frame head is solved
Analyse and join with acquisition protocol version, urgent broadcast instruction, service integration frame identification, update sequence number of network information list, service integration
Put table updating sequence number, ESG updates the information such as sequence number, multiplexed sub frame quantity, multiplexed sub frame length list.
Fig. 4 is the functional flow diagram of the CMF data resolution module in CDR Deplexing apparatus according to embodiments of the present invention.
CMF data mainly carry the control information that its form is information table sequence, and such as the transmission parameter of traffic frame, business arranges
Table, network parameter etc., wherein, period service duplexing configuration list gives the main information resolved required for control module.CMF data solution
Analysis module reads its control information carried by Data Storage from CMF data storage Buffer and carries out CMF number
According to parsing, its process of analysis is as shown in Figure 4.
CMF frame is synchronized, obtains CMF frame head length CMFheader_length, it is judged that whether CMF frame head length is
Valid lengths.It is not valid lengths such as it, then re-starts the synchronization of CMF frame；As it is valid lengths, then read CMF frame head
Data block CRC_data of+4 bytes of length.It follows that CRC_data is carried out CRC check, if check errors, the most again
Carry out the synchronization of CMF frame；As correct in verified, then CMF frame head is resolved and control information table quantity, control information table to obtain
The information such as length list.
Then, according to controlling the identification number of information table, such as 0x01,0x02,0x03 etc., respectively to the net in information sequence table
Network information table, period service duplexing configuration list, ESG substantially describe table etc. and resolve respectively.As a example by period service duplexing configuration list, according to
Its analysis result, resolves control module and obtains length section_len of this information table, then read each word of section_len
The data block (CRC_data) of joint, then carries out CRC check to this data block.
In the case of CRC check is correct, resolve period service duplexing configuration list to obtain service integration frame identification number
Amount, service integration frame identification numbering, the instruction of business datum hierarchical modulation, business datum height protection instruction, multiplexed frame transmission mould
The information such as formula, multiplexed sub frame quantity, service identification, use for resolving control module.
Fig. 5 is the functional flow diagram of the parsing control module in CDR Deplexing apparatus according to embodiments of the present invention.
It should be pointed out that, and CDR multiplex stream may comprise MCVF multichannel voice frequency broadcast, other data services of multichannel.Owing to interrupting institute
A simply road audio broadcasting therein and/or one or more data service therein needed, therefore have in demultiplexing layer
There is parsing control, to meet the selection to business of system or user.Each business has unique service identification, and this information exists
CMF is given, but does not has in SMF, need to remove index by service integration frame identification and service integration subframe sequence number.
Professional should further appreciate that, each example described in conjunction with the embodiments described herein
Unit and algorithm steps, it is possible to electronic hardware, computer software or the two be implemented in combination in, hard in order to clearly demonstrate
Part and the interchangeability of software, the most generally describe composition and the step of each example according to function.
These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.
Professional and technical personnel can use different methods to realize described function to each specifically should being used for, but this realization
It is not considered that it is beyond the scope of this invention.
The method described in conjunction with the embodiments described herein or the step of algorithm can use hardware, processor to perform
Software module, or the combination of the two implements.Software module can be placed in random access memory (RAM), internal memory, read only memory
(ROM), electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known in.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail.Be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not used to limit this
Bright protection domain.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (10)
1. the Deplexing method for Chinese Digital broadcast audio CDR, it is characterised in that including:
The transmission flow data of the CDR after demodulation is resolved, obtains service integration frame SMF data and control multiplexed frame CMF number
According to, described SMF data carry the audio pack for audio broadcast services and the packet for other applied business, described CMF
Data carry control information；
Resolve to obtain described control information to described CMF data；
Carrying out data filtering according to described control information, data filtering result is for controlling the parsing to SMF data；
According to described data filtering result, described SMF data are resolved, obtain the voice data comprised in described audio pack
Or the application data comprised in described packet.
Deplexing method for Chinese Digital broadcast audio CDR the most according to claim 1, it is characterised in that to described CMF
The step that data carry out resolving to obtain described control information includes:
Obtain CMF frame head length；
Judge whether described CMF frame head length is valid lengths；
In the case of the described a length of valid lengths of CMF frame head, read cyclic redundancy check (CRC) number according to CMF frame head length
According to and carry out CRC check；
In the case of CRC check is correct, read the information in described CMF frame head；
The information resolved in CMF frame head obtains period service duplexing configuration list；
Resolve described period service duplexing configuration list, obtain described control information.
Deplexing method for Chinese Digital broadcast audio CDR the most according to claim 1, it is characterised in that according to described
Control information carries out the step of data filtering and includes:
According to service identification, carrying out reverse indexing in service lists, obtain described data filtering result, described data filtering is tied
Fruit includes service integration frame identification and service integration subframe sequence number；
Wherein, described control information includes that service lists, described service lists include multiple service integration frame identification, Mei Geye
Business multiplexed frame identifies corresponding multiple service integration subframe sequence numbers and multiple service identification, each service integration subframe sequence number correspondence one
Individual service identification.
Deplexing method for Chinese Digital broadcast audio CDR the most according to claim 1, it is characterised in that according to described
The step that described SMF data are resolved by data filtering result includes:
According to multiplexed sub frame length list and described control acquisition of information multiplexed sub frame data, wherein, described multiplexed sub frame length
List obtains by resolving SMF frame head；
Described subframe head is verified by the subframe head length obtaining described multiplexed sub frame data；
In the case of described verification is correct, resolves described subframe head and obtain instruction information；
According to described instruction information and described control information, described audio pack or described packet are resolved, obtain for sound
Frequently broadcasting service voice data or for the application data of other applied business.
The most according to claim 4 for Chinese Digital broadcast audio CDR Deplexing method, it is characterised in that to described son
Frame head carry out the result that verifies incorrect in the case of:
SMF frame is synchronized；
Obtain SMF frame head length；
Judge whether SMF frame head length is valid lengths；
In the case of a length of valid lengths of SMF frame head, read cyclic redundancy check (CRC) data also according to SMF frame head length
Carry out CRC check；
In the case of described CRC check is correct, resolves SMF frame head and obtain described multiplexed sub frame length list.
6. one kind is used for Chinese Digital broadcast audio CDR Deplexing apparatus, it is characterised in that including:
Transmission stream parsing module, for resolving the transmission flow data of the CDR after demodulation, obtains service integration frame SMF number
According to control multiplexed frame CMF data, described SMF data carry for audio broadcast services audio pack and for other apply industry
The packet of business, described CMF data carry control information；
CMF data resolution module, for resolving to obtain described control information to described CMF data；
Resolving control module, for carrying out data filtering according to described control information, data filtering result is for controlling SMF number
According to parsing；
SMF data resolution module, under the control resolving control module, according to described data filtering result to described SMF
Data resolve.
Chinese Digital broadcast audio CDR Deplexing apparatus the most according to claim 6, it is characterised in that described parsing controls mould
Block specifically for:
Obtain CMF frame head length；
Judge whether described CMF frame head length is valid lengths；
In the case of the described a length of valid lengths of CMF frame head, read cyclic redundancy check (CRC) number according to CMF frame head length
According to and carry out CRC check；
In the case of CRC check is correct, read the information in described CMF frame head；
The information resolved in CMF frame head obtains period service duplexing configuration list；
Resolve described period service duplexing configuration list, obtain described control information.
Chinese Digital broadcast audio CDR Deplexing apparatus the most according to claim 6, it is characterised in that described CMF data parsing
Module specifically for:
According to service identification, carrying out reverse indexing in service lists, obtain described data filtering result, described data filtering is tied
Fruit includes service integration frame identification and service integration subframe sequence number；
Wherein, described control information includes that service lists, described service lists include multiple service integration frame identification, Mei Geye
Business multiplexed frame identifies corresponding multiple service integration subframe sequence numbers and multiple service identification, each service integration subframe sequence number correspondence one
Individual service identification.
Chinese Digital broadcast audio CDR Deplexing apparatus the most according to claim 6, it is characterised in that described SMF data parsing
Module specifically for:
According to multiplexed sub frame length list and described control acquisition of information multiplexed sub frame data, wherein, described multiplexed sub frame length
List obtains by resolving SMF frame head；
Described subframe head is verified by the subframe head length obtaining described multiplexed sub frame data；
In the case of described verification is correct, resolves described subframe head and obtain instruction information；
According to described instruction information and described control information, described audio pack or described packet are resolved, obtain for sound
Frequently broadcasting service voice data or for the application data of other applied business.
Chinese Digital broadcast audio CDR Deplexing apparatus the most according to claim 9, it is characterised in that to described subframe head
Carry out the result that verifies incorrect in the case of:
SMF frame is synchronized；
Obtain SMF frame head length；
Judge whether SMF frame head length is valid lengths；
In the case of a length of valid lengths of SMF frame head, read cyclic redundancy check (CRC) data also according to SMF frame head length
Carry out CRC check；
In the case of described CRC check is correct, resolves SMF frame head and obtain described multiplexed sub frame length list.
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