CN102014299B - Method and device for realizing multi-frequency point multiplexing of paths of data - Google Patents
Method and device for realizing multi-frequency point multiplexing of paths of data Download PDFInfo
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Abstract
The invention discloses a method and a device for realizing the multi-frequency point multiplexing of a plurality of paths of data. The method comprises the following steps of: generating a corresponding relationship table between multiplexing sub-frame numbers and frequency point numbers according to the control information of a plurality of frequency points; filling a plurality of paths of source code data corresponding to each frequency point number in the corresponding relationship table as multiplexing sub-frame data into the multiplexing sub-frame numbers corresponding to each frequency point number; forming the multiplexing frame data of the corresponding frequency point numbers by using the multiplexing sub-frame data in the multiplexing sub-frame numbers corresponding to each frequency point number; and packaging the multiplexing frame data of the corresponding frequency point numbers into packaged multiplexing stream (PMS) packets and outputting the PMS packets to a modulator. In the device, a control unit, a multiplexing processing unit, multiplexing packaging units of the plurality of frequency points, and a transcoding unit perform data exchange through network equipment. In the method and the device, a plurality of paths of television program data are multiplexed and converted into a plurality of paths of data code streams suitable for modulation and transmission under the condition of not increasing the running and maintenance cost.
Description
Technical field
The present invention relates to China mobile multi-media broadcasting technology field, relate in particular to a kind of method and device of realizing multi-frequency point multiplexing of paths of data.
Background technology
Mobile Multimedia Broadcasting is that mobile TV has a plurality of industry standards and deposits in the world at present, CMMB (China Multimedia Mobile Broadcasting wherein, China's Multimedia Mobile broadcast) standard is the mobile TV industry standard of Chinese independent research, is paid attention to widely.This standard comprises a plurality of parts, wherein the multiplexing normalized definition of part 2 the multiplexed sub frame structure of video, audio frequency, data and control information in mobile multimedia broadcast system and the structure of the multiplexed frame that formed by a plurality of multiplexed sub frames.Along with constantly popularizing of mobile TV, operator needs constantly to increase mobile TV program could meet growing user's request, therefore to operator, has brought the pressure to the further investment of multiplexing equipment.
From encoder output multi-channel program source data, first needed the multiplexing function of multi-channel program, the program stream after multiplexing completing could pass through modulate emission.At present, existing single-frequency point multiplexing method can only be realized a circuit-switched data code stream, for operator, to realize the output that multi-channel program is the data code flow of a plurality of frequencies simultaneously, must buy many single-frequency point multiplexing equipments and realize, but this method can cause the raising of operation cost and the maintenance cost of operator.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of method and device of realizing multi-frequency point multiplexing of paths of data is provided, in the situation that not increasing operation and maintenance cost, by multi-channel tv programs data-reusing and convert the multichannel data code stream that is applicable to modulate emission to.
The technical solution used in the present invention is that the described method that realizes multi-frequency point multiplexing of paths of data, comprising:
Step 1, according to the control information of a plurality of frequencies, generate multiplexed sub frame number and frequency point number mapping table;
Step 2, using multichannel code source data corresponding to each frequency point number in described mapping table as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively;
Step 3, multiplexed sub frame corresponding to each frequency point number number associated multiplexed sub frame data are formed to the multiplexed frame data of respective tones period;
Step 4, the multiplexed frame data of respective tones period are carried out exporting to modulator after PMS (Packaged Multiplexing Stream, multiplexed signals stream) bag encapsulation process.
Further, described control information comprises: the channel configuration information of multiplexed frame allocation list, network information table and multiplexed frame;
In described step 1, further according to the multiplexed frame allocation list of a plurality of frequencies and network information table, generate multiplexed sub frame number and frequency point number mapping table.
Further, in described step 3, according to the multiplexed frame allocation list of a plurality of frequencies, multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number are formed to the multiplexed frame data of respective tones period.
Further, described step 4 specifically comprises:
First the multiplexed frame data of respective tones period are cut to bag, then according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of the multiplexed frame of a plurality of frequencies, export to modulator;
The channel configuration information of described multiplexed frame comprises: byte-interleaved pattern, modulation system and RS (reed solomon, Read-solomon) bit rate.
Further, described step 1 also comprises: the control frame that is generated corresponding frequency by the control information of a plurality of frequencies;
Described step 2 also comprises:
Using described control frame as multiplexed sub frame data respectively the multiplexed sub frame number corresponding with respective tones period be associated.
The present invention also provides a kind of device of realizing multi-frequency point multiplexing of paths of data, and multiplexing encapsulation unit and the transcoding units of control unit, multiplexing process unit, a plurality of frequencies carry out data interaction by the network equipment, wherein:
Control unit, for sending to multiplexing process unit by the control information of a plurality of frequencies;
Multiplexing process unit, for generate multiplexed sub frame number and frequency point number mapping table according to the control information of a plurality of frequencies, sends to transcoding units; The multiplexed sub frame number corresponding according to each frequency point number obtains multiplexed sub frame data to transcoding units, then multiplexed sub frame data corresponding to each frequency point number formed to the multiplexed frame data of respective tones period;
The multiplexing encapsulation unit of a plurality of frequencies, carries out exporting to modulator after PMS bag encapsulation process for the multiplexed frame data to respective tones period;
Transcoding units, for receiving multichannel code source data corresponding to each frequency point number according to described mapping table as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively.
Further, described control information comprises: the channel configuration information of multiplexed frame allocation list, network information table and multiplexed frame;
Described multiplexing process unit, for generate multiplexed sub frame number and frequency point number mapping table according to the multiplexed frame allocation list of a plurality of frequencies and network information table, sends to transcoding units.
Further, described multiplexing process unit is for forming multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number according to the multiplexed frame allocation list of a plurality of frequencies the multiplexed frame data of respective tones period.
Further, described multiplexing process unit writes respectively the buffering area of the multiplexing encapsulation unit of a plurality of respective tones periods for the multiplexed frame data of each frequency point number being take to time slot according to the channel configuration information of the multiplexed frame of a plurality of frequencies as unit;
Described multiplexing encapsulation unit is used for first the multiplexed frame data in its buffering area being cut to bag, then according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of multiplexed frame, exports to modulator.
Further, described multiplexing process unit forms the control frame of a plurality of frequencies with the control information of a plurality of frequencies, using described control frame as multiplexed sub frame data respectively the multiplexed sub frame number corresponding with each frequency point number be associated.
Adopt technique scheme, the present invention at least has following advantages:
Method and the device of realizing multi-frequency point multiplexing of paths of data of the present invention, can not increase operation and maintenance cost in the situation that, by multi-channel tv programs data-reusing and convert the multichannel data code stream that is applicable to modulate emission to.Technical solution of the present invention is to < < People's Republic of China (PRC) radio, film and television industry standard Mobile Multimedia Broadcasting part 2: the defined function of multiplexing > > has been carried out rational decomposition and execution, can complete accurately and efficiently the function that multi-channel tv programs is multiplexed into multichannel PMS code stream, save the hardware and software cost of operator.
Accompanying drawing explanation
Fig. 1 realizes the method flow diagram of multi-frequency point multiplexing of paths of data described in first embodiment of the invention;
Fig. 2 realizes multi-frequency point multiplexing of paths of data system to form schematic diagram in second embodiment of the invention;
Fig. 3 is multi-frequency point multiplexing of paths of data process schematic diagram in second embodiment of the invention;
Fig. 4 is the installation composition schematic diagram of realizing multi-frequency point multiplexing of paths of data described in third embodiment of the invention.
Embodiment
For further setting forth the present invention, reach technological means and the effect that predetermined object is taked, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail as after.
First embodiment of the invention, a kind of method that realizes multi-frequency point multiplexing of paths of data, as shown in Figure 1, comprises following concrete steps:
Step S101, generates multiplexed sub frame number and frequency point number mapping table according to the multiplexed frame allocation list in the control information of a plurality of frequencies and network information table, is generated the control frame of corresponding frequency by the control information of a plurality of frequencies.In this area, control information generally includes: the channel configuration information of multiplexed frame allocation list, network information table, service allocation list and multiplexed frame etc.
The corresponding relation that includes multiplexing frame number and multiplexed sub frame number in multiplexed frame allocation list, comprises the corresponding relation of multiplexed sub frame number and frequency point number in network information table.Frequency and frequency point number are corresponding one by one.
Step S102, according to multiplexed sub frame number and frequency point number mapping table, using multichannel code source data corresponding to each frequency point number and control frame as multiplexed sub frame data respectively the multiplexed sub frame number corresponding with each frequency point number be associated.Because there are a plurality of multiplexed sub frames under same frequency, each multiplexed sub frame has a multiplexed sub frame number, so this step concerning each frequency, is multiplexed sub frame data for this frequency, is numbered with successively the multiplexed sub frame number that belongs to this frequency.
Step S103, forms multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number according to the multiplexed frame allocation list of a plurality of frequencies the multiplexed frame data of respective tones period.
Step S104, first cuts bag to the multiplexed frame data of respective tones period, then according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of the multiplexed frame of a plurality of frequencies, exports to modulator.The channel configuration information of multiplexed frame comprises: byte-interleaved pattern, modulation system and RS bit rate.
The size of wrapping due to PMS is 188 bytes, and wherein PMS packet header accounts for 44 bytes, therefore, in this step, multiplexed frame data is cut into 144 bytes and cuts bag.
Second embodiment of the invention, introduces a kind of method that realizes multi-frequency point multiplexing of paths of data based on actual multiplexing equipment.The paper system that once multiplex process relates to, as shown in Figure 2, this system comprises: encoder, ESG (Electronic Service Guide, electron service instruction) server, broadcast data server, transcoder, multiplexer, control desk and switch, if encoder, ESG server, broadcast data server, transcoder, multiplexer and these equipment of control desk have data interaction all to be undertaken by switch each other.The coordinated multifrequency point of multichannel data of the said equipment is multiplexing.
Encoder, ESG server and broadcast data server are mainly to generate the needed code of transcoder source data, then FE (Fast Ethernet, Fast Ethernet) mouthful by 100M through the network equipment for example switch send to transcoder.Concrete, encoder provides multichannel audio-video frequency data, and ESG server provides multichannel EPG information, and broadcast data server provides multichannel data broadcast message.Control desk, for sending to multiplexer by the control information of a plurality of frequencies.
Multiplexer inside completes multiplexing function jointly by the multiplexing encapsulation unit of multiplexing process unit and a plurality of different frequent points.Multiplexing encapsulation unit can adopt FPGA (Programmable Gate Array, field programmable gate array) realize, the multiplexing encapsulation unit of a plurality of different frequent points comprises: the multiplexing encapsulation unit FPGA1 of the first frequency point number, the multiplexing encapsulation unit FPGA2 of the second frequency point number ..., the multiplexing encapsulation unit FPGAn of n frequency point number, n > 1.Between multiplexing process unit and a plurality of multiplexing encapsulation unit, adopt data/address bus to connect, make transfer of data very convenient.Multiplexer externally adopts the FE mouth of 100M, for receiving the control information of control console and from the multiplexed sub frame data of transcoder.Transcoder by 100M Fast Ethernet mouth receive the output of multiplex coding device H.264 or the multi-medium data of AVS form, and each road multi-medium data is become to multiplexed sub frame according to the definition process of multiplexing standard, multiplexed sub frame is exported to multiplexer by the FE mouth of 100M.The multiplexing process unit of multiplexer completes the work that multi-frame is set up, and the multiplexing encapsulation unit of multiplexer completes the work that multi-frame is converted to PMS code stream.
As shown in Figure 3, to realize the multiplexing process of multifrequency point as follows for the equipment based in Fig. 2:
Step S201, control desk serial sends the control information of a plurality of frequencies to multiplexer.In this area, control information generally includes: the channel configuration information of multiplexed frame allocation list, network information table, service allocation list and multiplexed frame etc.
Step S202, the control information of a plurality of frequencies of multiplexing process element analysis in multiplexer, generates multiplexed sub frame number and frequency point number mapping table according to the multiplexed frame allocation list in the control information of a plurality of frequencies and network information table, and sends to transcoder.The corresponding relation that includes multiplexing frame number and multiplexed sub frame number in multiplexed frame allocation list, comprises the corresponding relation of multiplexed sub frame number and frequency point number in network information table.Frequency and frequency point number are corresponding one by one.
Step S203, conventionally, the multiplexing process unit in multiplexer also needs to generate with the control information of a plurality of frequencies the control frame of corresponding frequency, and using control frame as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively.
Step S204, transcoder receives the multichannel code source data of each frequency, and according to multiplexed sub frame number and frequency point number mapping table, using multichannel code source data as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively.Multichannel code source data comprises the multichannel data broadcast message of the multichannel audio-video frequency data of encoder output, multichannel EPG (Electronic Program Guide, the electronic program guides) information of EDS server output and broadcast data server output.
Step S205, multiplexing process unit in multiplexer obtains multiplexed sub frame corresponding to each frequency point number number associated multiplexed sub frame data by switch to transcoder with frequency point number mapping table according to multiplexed sub frame number, according to the multiplexed frame allocation list of a plurality of frequencies, multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number is formed to the multiplexed frame data of respective tones period.
Step S206, take time slot by the multiplexed frame data of respective tones period and writes the buffering area of the multiplexing encapsulation unit of a plurality of respective tones periods in multiplexer as unit in the multiplexing process unit in multiplexer.
Step S207, each multiplexing encapsulation unit is first cut bag to the multiplexed frame data of respective tones period in its buffering area, again according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of the multiplexed frame of a plurality of frequencies, PMS bag is passed through to a plurality of SPI (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) or ASI (Asynchronous Serial Interface, asynchronous serial port) send to modulator.
Third embodiment of the invention, sum up the function of each part of system in the second embodiment, as shown in Figure 4, the present embodiment is introduced a kind of device of realizing multi-frequency point multiplexing of paths of data, multiplexing encapsulation unit and the transcoding units of control desk, multiplexing process unit, a plurality of frequencies carry out data interaction by the network equipment, wherein:
1) control desk, for sending to multiplexing process unit by the control information of a plurality of frequencies.Control information comprises: the channel configuration information of multiplexed frame allocation list, network information table, service allocation list and multiplexed frame;
2) multiplexing process unit, for generate multiplexed sub frame number and frequency point number mapping table according to the multiplexed frame allocation list of the control information of a plurality of frequencies and network information table, sends to transcoding units; The multiplexed sub frame number corresponding according to each frequency point number obtains multiplexed sub frame data to transcoding units, then multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number formed to the multiplexed frame data of respective tones period according to the multiplexed frame allocation list of a plurality of frequencies;
Multiplexing process unit also writes respectively the buffering area of the multiplexing encapsulation unit of a plurality of respective tones periods for the multiplexed frame data of each frequency point number being take to time slot according to the channel configuration information of the multiplexed frame of a plurality of frequencies as unit.
Conventionally, multiplexing process unit also needs to form with the control information of a plurality of frequencies the control frame of a plurality of frequencies, and using control frame as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively.
3) the multiplexing encapsulation unit of a plurality of frequencies, comprise: the multiplexing encapsulation unit of the first frequency point number, the encapsulation unit of the second frequency point number ..., the multiplexing encapsulation unit of n frequency point number, n > 1, each multiplexing encapsulation unit is first cut bag to the multiplexed frame data in its buffering area, according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of multiplexed frame, export to modulator again.
4) transcoding units, for receiving multichannel code source data according to described mapping table as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively.
In a word, adopt technical scheme of the present invention to carry out after multiplexing conversion the multi-channel program data of encoder output, the PMS code stream of output is applicable to modulate emission.For the multifrequency point wireless transmission of multi-channel tv programs provide may, save maintenance and the operation cost of operator simultaneously, save the output of device hardware resource, can be widely used in broadcast television industry.
By the explanation of embodiment, should be to reach technological means and the effect that predetermined object takes to be able to more deeply and concrete understanding to the present invention, yet appended diagram be only to provide with reference to the use with explanation, be not used for the present invention to be limited.
Claims (10)
1. a method that realizes multi-frequency point multiplexing of paths of data, is characterized in that, comprising:
Step 1, according to the control information of a plurality of frequencies, generate multiplexed sub frame number and frequency point number mapping table; Described control information comprises: multiplexed frame allocation list, network information table, the corresponding relation that includes multiplexing frame number and multiplexed sub frame number in multiplexed frame allocation list, the corresponding relation that comprises multiplexed sub frame number and frequency point number in network information table, further generates multiplexed sub frame number and frequency point number mapping table according to the multiplexed frame allocation list of a plurality of frequencies and network information table in described step 1;
Step 2, using multichannel code source data corresponding to each frequency point number in described mapping table as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively;
Step 3, multiplexed sub frame corresponding to each frequency point number number associated multiplexed sub frame data are formed to the multiplexed frame data of respective tones period;
Step 4, the multiplexed frame data of respective tones period are carried out exporting to modulator after multiplexed signals stream PMS bag encapsulation process.
2. realize according to claim 1 the method for multi-frequency point multiplexing of paths of data, it is characterized in that, described control information also comprises: the channel configuration information of multiplexed frame.
3. realize according to claim 2 the method for multi-frequency point multiplexing of paths of data, it is characterized in that, in described step 3, further according to the multiplexed frame allocation list of a plurality of frequencies, multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number are formed to the multiplexed frame data of respective tones period.
4. according to the method that realizes multi-frequency point multiplexing of paths of data described in claim 2 or 3, it is characterized in that, described step 4 specifically comprises:
First the multiplexed frame data of respective tones period are cut to bag, then according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of the multiplexed frame of a plurality of frequencies, export to modulator;
The channel configuration information of described multiplexed frame comprises: byte-interleaved pattern, modulation system and Read-solomon RS bit rate.
5. realize according to claim 1 the method for multi-frequency point multiplexing of paths of data, it is characterized in that, described step 1 further comprises: the control frame that is generated corresponding frequency by the control information of a plurality of frequencies;
Described step 2 further comprises:
Using described control frame as multiplexed sub frame data respectively the multiplexed sub frame number corresponding with respective tones period be associated.
6. realize a device for multi-frequency point multiplexing of paths of data, multiplexing encapsulation unit and the transcoding units of control unit, multiplexing process unit, a plurality of frequencies carry out data interaction by the network equipment, wherein:
Control unit, for sending to multiplexing process unit by the control information of a plurality of frequencies; Described control information comprises: multiplexed frame allocation list, network information table, in multiplexed frame allocation list, include the corresponding relation of multiplexing frame number and multiplexed sub frame number, and in network information table, comprise the corresponding relation of multiplexed sub frame number and frequency point number,
Multiplexing process unit, for generate multiplexed sub frame number and frequency point number mapping table according to the control information of a plurality of frequencies, sends to transcoding units; The multiplexed sub frame number corresponding according to each frequency point number obtains multiplexed sub frame data to transcoding units, then multiplexed sub frame data corresponding to each frequency point number formed to the multiplexed frame data of respective tones period; Described multiplexing process unit is further used for generating multiplexed sub frame number and frequency point number mapping table according to the multiplexed frame allocation list of a plurality of frequencies and network information table, sends to transcoding units;
The multiplexing encapsulation unit of a plurality of frequencies, carries out exporting to modulator after multiplexed signals stream PMS bag encapsulation process for the multiplexed frame data to respective tones period;
Transcoding units, for receiving multichannel code source data corresponding to each frequency point number according to described mapping table as multiplexed sub frame data, the multiplexed sub frame corresponding with each frequency point number number is associated respectively.
7. realize according to claim 6 the device of multi-frequency point multiplexing of paths of data, it is characterized in that, described control information also comprises: the channel configuration information of multiplexed frame.
8. realize according to claim 7 the device of multi-frequency point multiplexing of paths of data, it is characterized in that, described multiplexing process unit is further used for according to the multiplexed frame allocation list of a plurality of frequencies, multiplexed sub frame number associated multiplexed sub frame data corresponding to each frequency point number being formed the multiplexed frame data of respective tones period.
9. according to the device of realizing multi-frequency point multiplexing of paths of data described in claim 7 or 8, it is characterized in that, described multiplexing process unit is further used for, according to the channel configuration information of the multiplexed frame of a plurality of frequencies, the multiplexed frame data of each frequency point number be take to time slot and writes respectively the buffering area of the multiplexing encapsulation unit of a plurality of respective tones periods as unit;
Described multiplexing encapsulation unit is further used for first the multiplexed frame data in its buffering area being cut to bag, then according to forming the PMS bag of respective tones period behind the channel configuration information interpolation PMS packet header of multiplexed frame, exports to modulator.
10. realize according to claim 6 the device of multi-frequency point multiplexing of paths of data, it is characterized in that, described multiplexing process unit further forms the control frame of a plurality of frequencies with the control information of a plurality of frequencies, using described control frame as multiplexed sub frame data respectively the multiplexed sub frame number corresponding with each frequency point number be associated.
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