CN101359974B - High-efficient source adaptation method suitable for LDPC block coding in T-MMB system - Google Patents
High-efficient source adaptation method suitable for LDPC block coding in T-MMB system Download PDFInfo
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Abstract
The invention provides an efficient information source adapter method adapted to block encoding of low density parity check code (LDPC) in a terrestrial mobile multimedia broadcasting (T-MMB), information source adapter kits are used for encapsulating audio and video basic flow at a sending end, and information source adapter units the length of which is fixed at 288 bytes are used for encapsulating the information source adapter kits. Specific information source adapter unit program description unit are used for carrying description information of audio and video and data. A receiving end uses the program description unit to obtain the information of audio and video data, analyses the information source adapter units to obtain the information source adapter kits, and obtains audio and video frames and time information at last. Meanwhile, start position alignment and accurate and efficient fault-tolerant processing of encoding and decoding can be realized during LDPC encoding and decoding process.
Description
Technical field
The present invention relates to digital multimedia broadcasting system, particularly a kind of message-source adapted technology that in the T-MMB system, is applicable to the LDPC block encoding.
Background technology
Ground mobile multimedia broadcast T-MMB system is on the basis of digital audio broadcasting (DAB) and T-DMB (T-DMB) standard; Use time-multiplexed method can in a plurality of subchannels, transmit the DAB business simultaneously; DAB-IP is professional; T-DMB is professional and T-MMB is professional, as shown in Figure 1.The T-MMB business support is LDPC block encoding (as shown in Figure 2, stream mode transmission) and high order modulation efficiently, like 8DPSK or 16DAPSK, thereby realizes a kind of Compatiable DAB system digital multimedia broadcasting system of high-efficiency high-quality again.
The coding flow process of T-MMB system: the video of the video traffic among the T-MMB and audio frequency, through message-source adapted, scrambling (optional); The energy dissipation scrambler through being the LDPC coding of unit with 288 bytes, carries out time-interleaved again; Send into MSC (MSC) multiplexer; Through frequency interlacing and OFDM modulation, pass through up-conversion and power amplification again, finally go out through transmission antennas transmit.The message-source adapted technology is under band-limited prerequisite, solves the problem of transmission information source content and information source information.
Because the block length of LDPC block encoding is 288 bytes in the T-MMB system; Supposing to adopt existing message-source adapted standard is that MPEG-2TS (motion image expert group 2 MPTS) mode of unit is packed like 188 bytes; When carrying out error handling processing, must lead to errors and accurately to locate.If error code has appearred in the LDPC piece of one 288 byte; The LDPC decoding of receiving terminal is owing to can not judge it specifically is which the bit appearance mistake in 288 bytes; Receiving terminal can only suppose that each bit all mistake might occur; And possibly comprise 3 data in the TS bag in 288 bytes, and then need 3 TS bags be put mistake, the data that impact have the 188*3=564 byte.And if adopt with 288 bytes is the message-source adapted of unit, at receiving terminal,, then only need 1 SAU is put mistake if mistake appears in a LDPC piece, the data that impact have only 288 bytes.So propose here to be applicable among the T-MMB that the LDPC IOB is the source adaptation method (SAF) of 288 bytes.
Moreover the adaptation technique of similar MPEG-2 TS stream all is the digital television application design for high bandwidth, in a channel, comprises multiple programs, therefore needs a cover complex data structures to describe, as: the program description (PSI) in the TS stream.And mobile TV/China mobile multi-media broadcasting technology is in order to save power consumption; Only can comprise a programs in the general channel; And complex data structures can cause excessive transport overhead; So be not suitable for mobile TV/CMMB, therefore need a kind of message-source adapted simple in structure, that transport overhead is little technological.
Because 288 bytes are large enough to hold present T-MMB audio frequency and video and data message and scramble information, propose here to describe audio frequency and video and scramble information with a message-source adapted unit.Compare in the MPEG-2 TS stream and utilize PSI to describe audio/video information and scramble information, transport overhead is saved and is surpassed half.
On the other hand, be surrounded by the head of 4 bytes with respect to the TS of 188 bytes, the adaptation unit that the present invention proposes is in 288 bytes, carries the head of 4 bytes, thus the bandwidth conservation of header information nearly half.
Summary of the invention
The objective of the invention is adopting LDPC block encoding block length is the T-MMB business of 288 bytes, proposes new message-source adapted technology SAF, can in the T-MMB system, simplify and realize message-source adapted efficiently.
The present invention proposes a kind of LDPC block encoding message-source adapted technology efficiently that in the T-MMB system, is adapted to, and comprising:
Encapsulate audio frequency and video with message-source adapted bag (SAP) and flow basically, it is a unit that audio frequency and video flow with a frame of video or audio frame basically, and the head of SAP carries the timestamp information of frame audio frequency and video, and the loading section of SAP is the audio, video data of a frame.
SAP is encapsulated in the loading section of message-source adapted unit (SAU) by cutting.SAU length adopts the block length of LDPC coding among the T-MMB, is fixed as 288 bytes.The packed transmission in specific message-source adapted unit program description unit PDU of the descriptor of all audio frequency, video and data.
According to above-mentioned method; It is characterized in that further comprising: SAU comprises the head of 4 bytes, and the main contents of head comprise sync byte, unit ID, mistake indication, system reference clock information, the initial bag indication of information source, scrambling indication and message-source adapted bag start offset etc.
According to above-mentioned method; It is characterized in that further comprising: the content of the video presentation section among the PDU; Mainly comprise video type, video unit ID (UID), decoding buffer size, the highest code check, average bit rate and the concrete parameter information of video decode, like information such as video resolutions.
According to above-mentioned method; It is characterized in that further comprising: the content of the audio description section among the PDU; Mainly comprise audio types, audio frequency UID, decoding buffer size, the highest code check, average bit rate and the concrete parameter information of video decode, like information such as audio sample rate and sound channels.
According to above-mentioned method, it is characterized in that further comprising: the condition among the PDU receives descriptor and comprises: condition receives information such as identification of the manufacturer, Entitlement Control Message (ECM) UID and Entitlement Management Message (EMM) UID.
According to above-mentioned method, it is characterized in that further comprising: the LDPC decoding block of receiving terminal occurs after the error bit, and the message-source adapted unit header is provided with a wrong indication information position, and perhaps putting the message-source adapted unit is dummy cell.
According to above-mentioned method, it is characterized in that further comprising: transmission/receiving terminal all carried out the alignment of coding/decoding grouping original position with the SAU synchronous head before the LDPC coding/decoding.
Description of drawings
Fig. 1 is a T-MMB system transmissions block diagram.
Fig. 2 is the professional process chart of T-MMB.
Fig. 3 is the SAF message-source adapted structure chart of T-MMB system.
Fig. 4 is that the message-source adapted bag of T-MMB system is formed structure chart.
Fig. 5 is the structure chart in the message-source adapted unit of T-MMB system.
Fig. 6 is the structure chart of the program description unit of T-MMB system.
Fig. 7 is the video presentation information structure diagram in the program description unit.
Fig. 8 is the audio description information structure diagram in the program description unit.
Fig. 9 is that the condition in the program description unit receives information structure diagram.
Figure 10 is the LDPC coding flow process that adopts the SAF technology in the T-MMB emission system
Figure 11 is the LDPC decoding process that adopts the SAF technology in the T-MMB receiving system
Embodiment
The T-MMB system can support DAB, DAB-IP, T-DMB and T-MMB professional, and T-MMB is professional to adopt the LDPC block encoding, and the 8DPSK/16DAPSK modulation.Because the block length of LDPC block encoding is 288 bytes among the T-MMB, be the SAF technology encapsulation information source and the information thereof of 288 bytes so adopt adaptation unit.
A kind of LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to that the present invention relates to, professional to the T-MMB that adopts the LDPC block encoding, at transmitting terminal, carry out before the chnnel coding audio frequency and video and information thereof being encapsulated.The encapsulation level is as shown in Figure 3.
The data of message-source adapted encapsulation have two kinds: the descriptor of audio frequency and video and audio, video data.
Encapsulation process such as Fig. 3 to audio, video data: to audio frequency, the video-frequency basic flow behind the coding; Be unit all with a frame; Be encapsulated as a message-source adapted bag (SAP),, comprise packet header and load like Fig. 4; Packet header has loadtype (audio frequency and video compression standard) and this frame to show timestamp and decoded time stamp, is frame data of audio frequency and video in the load.
At last, each message-source adapted bag is encapsulated, be divided into the adaptation unit (SAU) of regular length 288 bytes,, comprise adaptation unit head and adaptation unit load like Fig. 5.Wherein, the main information of head has: mistake indication and system reference clock and scramble information.Receiver can indicate to judge whether wrong bit occurs in this unit with mistake, and the system reference clock can make the clock of receiver and transmitting terminal keep synchronously.
Looking audio description information is encapsulated in the PDU adaptation unit.PDU is a special message-source adapted unit, and UID is fixed as 0, like Fig. 6, comprises head and load.The head of PDU is the head of adaptation unit, and the main contents of load are descriptors such as video, audio frequency, data and condition reception information, and wherein video, audio frequency and condition receive descriptor, respectively like Fig. 7, shown in 8,9.
Receive and resolve adaptation unit at receiving terminal, obtain the PDU unit according to UID earlier, resolve the descriptor that the UID that looks audio frequency and audio/video decoder among the PDU need, and this descriptor is passed to audio/video decoder.
The UID that solves according to PDU obtains the adaptation unit of audio frequency or video; From the adaptation unit load of audio frequency and video, obtain data and demonstration or decoded time stamp behind the audio/video coding, judge the beginning of new frame audio frequency and video with initial indication of message-source adapted bag in the adaptation unit head and message-source adapted bag start offset.Thus, source decoder can obtain a frame audio, video data and a temporal information thereof.
Transmitting terminal adopts the LDPC coding flow process of SAF technology shown in figure 10; After SAF technology adapted data entering chnnel coding; At first find first SAU synchronous head byte, and whether at interval according to 3 or 3 above sync bytes appear in 288 bytes continuously, judge whether synchronously.After synchronously, be unit with SAU, other data that synchronous head is outer are carried out energy dissipation, carry out the LDPC block encoding afterwards, carry out subsequent treatment again.
Receiving terminal adopts the LDPC decoding process of SAF technology shown in figure 11: before data got into the LDPC decoding, the treatment technology and the coding side of inspection synchronous head were similar, and different is 576 bytes that are spaced apart of synchronous head.After the Synchronous Processing, carry out the LDPC decoding, it is unit that the LDPC after the decoding divides into groups with 288 bytes, other outer data of synchronous head is carried out energy separate diffusion, promptly obtains a SAU.Judge whether the LDPC decoding check value that each SAU divides into groups is 0, if 0, then this LDPC does not have error code in dividing into groups, if 1, then explaining among this LDPC has error code, and the error message indication of the corresponding SAU head that then should divide into groups is set to 1, or it is set to dummy cell.
Claims (7)
1. one kind is applicable to LDPC block encoding source adaptation method efficiently in the T-MMB system, comprising:
Encapsulate audio frequency and video with message-source adapted bag SAP and flow basically, it is a unit that audio frequency and video flow with a frame of video or audio frame basically, and the head of SAP carries the timestamp information of frame audio frequency and video, and the loading section of SAP is the audio, video data of a frame; SAP is encapsulated in the loading section of message-source adapted cell S AU by cutting; SAU length adopts the block length of LDPC coding among the T-MMB, is fixed as 288 bytes;
The packed transmission in specific message-source adapted unit program description unit PDU of the descriptor of all audio frequency, video and data.
2. according to the described LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to of claim 1; It is characterized in that further comprising: SAU comprises the head of 4 bytes, and the main contents of head comprise sync byte, unit ID, mistake indication, system reference clock information, the initial bag indication of information source, scrambling indication and message-source adapted bag start offset.
3. according to the described LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to of claim 1; It is characterized in that further comprising: the content of the video presentation section among the PDU; Mainly comprise video type, video UID, decoding buffer size, the highest code check, average bit rate and the concrete parameter information of video decode, the concrete parameter information of said video decode comprises video resolution information.
4. according to the described LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to of claim 1; It is characterized in that further comprising: the content of the audio description section among the PDU; Mainly comprise audio types, audio frequency UID, decoding buffer size, the highest code check, average bit rate and the concrete parameter information of audio decoder, the concrete parameter information of said audio decoder comprises audio sample rate information and channel information.
5. according to the described LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to of claim 1, it is characterized in that further comprising: the condition among the PDU receives descriptor and comprises: condition receives identification of the manufacturer information, ECM UID information and EMM UID information.
6. according to the described LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to of claim 1; It is characterized in that further comprising: receiving terminal carries out the LDPC decoding to receiving data; After check value is made mistakes; This SAU head is provided with a wrong indication information position, and perhaps putting this SAU is dummy cell.
7. according to the described LDPC block encoding source adaptation method efficiently that in the T-MMB system, is applicable to of claim 1, it is characterized in that further comprising: transmission/receiving terminal all carried out the alignment of coding/decoding grouping original position with the SAF synchronous head before the LDPC coding/decoding.
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| CN103297173B (en) * | 2012-02-24 | 2016-08-03 | 国家广播电影电视总局广播科学研究院 | The sub data transmission of China's digital audio broadcast system connects receiving method, device |
| CN107295317A (en) * | 2017-08-25 | 2017-10-24 | 四川长虹电器股份有限公司 | A kind of mobile device audio/video flow live transmission method |
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| CN1889404A (en) * | 2006-07-31 | 2007-01-03 | 华为技术有限公司 | Mobile satellite broadcasting system and method for realizing multimedia business transmission |
| 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 |
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| 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 |
| CN1889404A (en) * | 2006-07-31 | 2007-01-03 | 华为技术有限公司 | Mobile satellite broadcasting system and method for realizing multimedia business transmission |
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