CN2648737Y - Decoding code translator based on digital video broadcasting - Google Patents
Decoding code translator based on digital video broadcasting Download PDFInfo
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- CN2648737Y CN2648737Y CN 200320101251 CN200320101251U CN2648737Y CN 2648737 Y CN2648737 Y CN 2648737Y CN 200320101251 CN200320101251 CN 200320101251 CN 200320101251 U CN200320101251 U CN 200320101251U CN 2648737 Y CN2648737 Y CN 2648737Y
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Abstract
The utility model belongs to the technical fields of digital video broadcasting channel decoding and video transcoding, and relates to a decoding and transcoding device based on digital video broadcasting. The utility model comprises a demodulator which is used for demodulating received digital television signals, a descrambler which is used for removing scrambling signals in primitive code flow signals, a communication channel coding decoder which is used for decoding inner codes, de-interleaving and decoding outer codes, and a TS flow de-multiplexer which is used for de-multiplexing TS flow in order to obtain the ES flow of MPEG-2, wherein components of the utility model are in integration by order cascade connection. The utility model is characterized in that the utility model also comprises a transcoding device which is in the cascade connection with the TS flow de-multiplexer and converts MPEG-2 audio and video flows to MPEG-4 audio and video flows with low code rates. Therefore, requirements of VOD are satisfied, and the network playing of digital television programs is realized; in this way, extensive computer users can watch favorite digital television programs through a computer network in a VOD method.
Description
Technical field
The utility model belongs to digital video broadcast channels decoding technique and Video Transcoding Technology field.
Technical background
Digital television techniques can provide high-quality TV programme, is development of television trend.The transmission of Digital Television is an importance of digital television techniques, owing to adopted digital video compaction technique, the ability of digital television transfer increases greatly, can provide the service that surpasses the 500 digital video channels of cover and 60 analog channels such as the cable TV that adopts compression of digital video.
Digital video broadcasting (DVB--Digital Video Broadcasting) has comprised the common TV of satellite, cable TV and terrestrial broadcasting and the broadcast transmitted of high definition TV.
DVB is a standard series, main standards has three: DVB-S, DVB-C and DVB-T, be respectively applied for satellite, cable TV and terrestrial broadcasting, obtained the approval of European Telecommunication Standard ETS (EuropeanTelecommunication Standard) and International Telecommunications Union (ITU--International TelecommunicationUnion).Other standard comprises the interface of professional equipment and Integrated Receive Decoder (IRD-Integrated ReceiveDecoder); The interactive service related standards; The standard relevant and the related standards of measurement aspect with encryption.
The core technology of DVB is MPEG-2 audio/video coding and code stream multiplex technology.The DVB technology is mainly used in digital satellite, ground and cable tv broadcast at present.First generation Europe DVB receiver will provide the image that reaches " 625 row studio " (ITU-R Rec.BT 601) quality, and image can be 4: 3 or 16: 9 the ratio of width to height.Can also determine used code check according to business need.In general, selected code check is high more, and the quality of image is good more, but the frequency band that takies is wide more.Select for use and the picture material of code check have very big relation, and more image such as sports cast etc. should adopt bigger code check for moving; And can adopt less code check for the film and television program.Therefore under the situation of a multiplexing synthetic bit stream, all adopt the method for statistic multiplexing at present, can between the program that different code checks need, distribute total code check neatly a plurality of program bitstream.In order to satisfy the requirement of all kinds material, ITU-Rec.TB 601 studio quality requisite number code checks are 9Mbps, it is 5Mbps with storing system (PAL/SECAM) broadcast quality requisite number code check that Phase Alternate Line/order transmits colored, but different for different encoding devices.Because it is a kind of packet structure that MPEG-2 transmits bit stream, so can add adequate information easily,, lump together as video/audio and data service various business, and the form of information on services done detailed regulation, formed standard is exactly the information on services standard.Same because MPEG-2 does not determine actual scrambling system and key management system, the condition that DVB has formulated decoder application receives common interface.To interactive application, cable TV, PSTN/integrated services digital network (PSTN/ISDN), global system for mobile communications (GSM) and radio communication access interface have been defined.
Because transmission manner is different, the subject matter that will face when transmission is also different, and different DVB standards is different to the processing of transport stream (TS-Transport Stream), and different DVB standards have different chnnel codings and channel modulation mode.The DVB standard has all adopted ISN coding and the outer sign indicating number two-layer coding form of encoding aspect chnnel coding.On the sign indicating number coding, the DVB standard all is an employing reed solomon coding (RS:Reed-Solomon) outside, but the ISN coding is different, and what the ISN coding of DVB-S and DVB-T adopted is convolutional encoding, and the employing of the ISN of DVB-C coding is differential coding.Aspect Channel Modulation, DVB-S has adopted quaternary phase shift keying modulation (QPSK), DVB-C to adopt the quadrature width of cloth to modulate (QAM) mutually.Because therefore the difference of each DVB standard on chnnel coding and Channel Modulation just have nothing in common with each other at the IRD of digital cable customers end.
Integrated Receive Decoder (IRD-Integrated Receiver Decoder) is the receiving equipment of Digital Television.It receives the digital television signal of satellite or Headend transmission, converts original digital code stream to original compression preceding form through channel encode-decode, source encoding decoding.Be sent to the common TV receiver or directly be sent to Digital Television or multimedia computer through D/A conversion and video coding again.Different according to satellite, cable TV with the terrestrial broadcasting mode, be divided into satellite IRD, the IRD that cable TV IRD and terrestrial broadcasting IRD are three types.
The structure chart of general existing IRD such as Fig. 1 comprise that the cascade all-in-one-piece is used for satellite successively, cable TV or ground broadcast signal carry out the demodulator of demodulation, signal after the demodulation is carried out the descrambler of matched filtering, the output signal of descrambler is carried out interior outer-decoder and the channel encode-decode device that deinterleaves, the TS stream that obtains behind the channel-decoding is carried out the TS stream demodulation multiplexer of demultiplexing, with MPEG-2 decoder that the basic stream (ES:Elementary Stream) of the MPEG-2 form that obtains behind the TS stream demultiplexing is decoded and the PAL/NTSC encoder that carries out the anolog TV signals coding; Digital television signal is imported from demodulator, the MPEG-2 code stream is from the output of TS stream demodulation multiplexer output, audio signal and vision signal be respectively from MPEG-2 decoder output, and wherein vision signal is carried out the D/A conversion by the PAL/NTSC encoder and exported in the mode of analog signal.IRD can not need to have the PAL/NTSC encoder of the function of D/A conversion if IRD is used for Digital Television and multimedia computer.
Current, digital television broadcasting (DVB) and network video-on-demand (VOD) all provide the audio frequency and video service, and digital television broadcasting belongs to two different fields with VOD.Digital television broadcasting via satellite, cell site, ground and cable network provide digital television program for vast digital cable customers, and VOD provides online video request program by the Internet for users, and both compare pluses and minuses mutually.DVB has a large amount of digital television programs, these digital television programs can satisfy user's requirement from every side, the program of VOD will lack manyly by contrast, even we can say that the audio/video program that VOD provides can not mention in the same breath with DVB on quantity and content.And VOD provides service by the Internet, and service range can be towards the whole world, and the user can watch the audio/video program that it provides in any place.Because the restriction of radio network, DVB provides the scope of service then little many.
Because the core technology of DVB is MPEG-2, therefore current all IRD can only export the audio/video flow of MPEG-2.But because the code check of MPEG-2 is than higher, if the audio/video program that uses MPEG-2 will be subjected to the restriction of the network bandwidth when the Network Transmission as the film source of VOD.By contrast, the code check of MPEG-4 is then lower, and program quality do not have too big reduction yet, is more suitable for VOD.
Summary of the invention
The purpose of this utility model is in order to overcome the deficiency of existing Integrated Receive Decoder, on the basis of the transmission acceptance criteria DVB of existing Digital Television, a kind of novel decoding transcoder is proposed, can carry out transcoding to the video data stream of the MPEG-2 in the Digital Television, convert the video data stream of MPEG-2 to low code check MPEG-4 video data stream, to adapt to the needs of VOD.Can make vast VOD user watch abundant in content digital television program, thereby bring into play the advantage of DVB and two kinds of audio frequency and video services of VOD better simultaneously.
The utility model proposes a kind of decoding transcoder (code check) from the code check of MPEG-2 to MPEG-4 based on digital video broadcasting (DVB), comprise the demodulator that digital television signal that cascade all-in-one-piece successively is used for receiving carries out demodulation, be used for removing the descrambler of the scrambled signals of original signal bit stream, be used for inner decoding, deinterleave and the channel encode-decode device of outer-decoder, TS stream is carried out the TS stream demodulation multiplexer that demultiplexing flows with the ES that obtains MPEG-2, it is characterized in that, also comprise the transcoder that the MPEG-2 audio/video flow is converted to the MPEG-4 audio/video flow that hangs down code check with the cascade of TS stream demodulation multiplexer.
Technical characterstic of the present utility model
The utility model is with the modulator among the existing IRD, descrambler, channel decoder, demodulation multiplexer and video code translator cascade, thereby realized the transcoding of digital television program, the audio/video program of MPEG-2 form is transcoded into the audio/video program of MPEG-4 form, to adapt to the requirement of VOD, provide the audio frequency and video service of better quality with lower code check.Realize the netcast of digital television program, vast like this computer user just can watch the digital television program of oneself liking by computer network in the mode of VOD.
Advantage of the present utility model
1. the digital television program of MPEG-2 form is converted into the digital video programs of MPEG-4 form
2. by video code conversion, the form that can adopt MPEG-4 of digital television program is viewed and admired for everybody by the mode of VOD with lower code check
3. by to the transcoding of digital television program, make the user view and admire digital television program on computers, the two big advantages of DVB and VOD are combined by the Internet.
4. by cascade, improve integrated level, helped the stable of system.
Description of drawings
Fig. 1 is existing IRD structured flowchart.
Fig. 2 is a decoding transcoder structured flowchart of the present utility model.
Embodiment
The utility model proposes based on the concrete case study on implementation of the decoding transcoder of DVB as follows:
The decoding transcoder structure that the utility model is introduced as shown in Figure 2, it comprises successively cascade all-in-one-piece demodulator, descrambler, channel encode-decode device, TS stream demodulation multiplexer, the transcoder from MPEG-2 to MPEG-4.
Function to each element of the present utility model adds a concrete explanation below:
1. demodulator: the digital television signal that receives is carried out demodulation.
2. descrambler: general digital television broadcasting system all can adopt the condition reception technique, and original signal bit stream is carried out scrambling, thereby makes the user who has only mandate just can enjoy digital television program.In the utility model, descrambler is carried out and is gone to disturb function.
3. channel encode-decode device: the error correction coding of channel comprises coding 3 parts outside coding in the channel, convolutional interleave and the channel in the DVB system.Therefore the decoding of chnnel coding also comprises 3 parts in the utility model:
(1) inner decoding
In different DVB systems, ISN coding is different, and what DVB-S and DVB-T adopted is convolutional encoding, is differential coding and DVB-C adopts, and therefore in different DVB standards, the decoder of ISN coding and decoding is just different.
(2) deinterleave
In DVB, all DVB standards all are that the interleave depth of employing is 12 convolutional interleave, therefore also need to deinterleave before carrying out outer-decoder.
(3) outer-decoder
In DVB, all DVB standards all are the RS codings that adopts, and therefore need carry out the decoding of RS coding.
4.TS stream demodulation multiplexer: TS stream is carried out demultiplexing to obtain the ES stream of MPEG-2.
5. video code translator: the MPEG-4 audio/video flow that the MPEG-2 audio/video flow is converted to low code check.
The structure of the transcoder of present embodiment can adopt conventional products such as pixel domain cascade transcoder (CPDT--Cascaded Pixel Domain Transcoder) structure, or DCT territory decoder (DDT--DCTDomain Transcoder) structure.
The application of present embodiment is a cable digital TV, is based on the DVB-C standard implementation.
Claims (3)
1, a kind of decoding transcoder based on digital video broadcasting, comprise digital television signal that cascade all-in-one-piece successively is used for receiving carry out the demodulator of demodulation, be used to remove the scrambled signals of original signal bit stream descrambler, be used for inner decoding, deinterleave and the channel encode-decode device of outer-decoder, TS stream carried out the TS stream demodulation multiplexer of demultiplexing with the ES stream that obtains MPEG-2, it is characterized in that, also comprise the transcoder that the MPEG-2 audio/video flow is converted to the MPEG-4 audio/video flow that hangs down code check with the cascade of TS stream demodulation multiplexer.
2, the decoding transcoder based on digital video broadcasting as claimed in claim 1 is characterized in that, said transcoder adopts pixel domain cascade transcoder.
3, the decoding transcoder based on digital video broadcasting as claimed in claim 1 is characterized in that, said transcoder adopts DCT territory decoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320101251 CN2648737Y (en) | 2003-10-17 | 2003-10-17 | Decoding code translator based on digital video broadcasting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200320101251 CN2648737Y (en) | 2003-10-17 | 2003-10-17 | Decoding code translator based on digital video broadcasting |
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| CN2648737Y true CN2648737Y (en) | 2004-10-13 |
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| CN 200320101251 Expired - Lifetime CN2648737Y (en) | 2003-10-17 | 2003-10-17 | Decoding code translator based on digital video broadcasting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159863B (en) * | 2006-10-08 | 2010-06-09 | 凌阳科技股份有限公司 | Image decoding and image transcoding method and system |
| CN101345869B (en) * | 2008-07-11 | 2011-02-02 | 华为技术有限公司 | Signal receiving method and system, and video decoding device |
| CN101262610B (en) * | 2008-03-27 | 2011-05-18 | 复旦大学 | A playing system for AVS-TS programs at portable terminal |
| CN101635830B (en) * | 2009-08-18 | 2011-09-28 | 深圳市同洲电子股份有限公司 | Method of video on demand, server side and client side |
-
2003
- 2003-10-17 CN CN 200320101251 patent/CN2648737Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159863B (en) * | 2006-10-08 | 2010-06-09 | 凌阳科技股份有限公司 | Image decoding and image transcoding method and system |
| CN101262610B (en) * | 2008-03-27 | 2011-05-18 | 复旦大学 | A playing system for AVS-TS programs at portable terminal |
| CN101345869B (en) * | 2008-07-11 | 2011-02-02 | 华为技术有限公司 | Signal receiving method and system, and video decoding device |
| CN101635830B (en) * | 2009-08-18 | 2011-09-28 | 深圳市同洲电子股份有限公司 | Method of video on demand, server side and client side |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131017 Granted publication date: 20041013 |