CN103248927A - MIMO (multiple-input multiple-output)-type DVB-T(Digital Video Broadcasting-Terrestrial) set top box with caption processing function - Google Patents
MIMO (multiple-input multiple-output)-type DVB-T(Digital Video Broadcasting-Terrestrial) set top box with caption processing function Download PDFInfo
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
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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
- H04N21/4343—Extraction or processing of packetized elementary streams [PES]
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- 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
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- 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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
Abstract
The invention relates to an MIMO (multiple-input multiple-output)-type DVB-T(Digital Video Broadcasting-Terrestrial) set top box with a caption processing function, which comprises a plurality of receiving antennae, an audio playing module and a video playing module, wherein the receiving antennae are used for receiving an MIMO-type DVB-T signal so as to play an audio signal in the MIMO-type DVB-T signal on the audio playing module and to play a video signal and caption display data in the MIMO-type DVB-T signal on the video playing module. By adopting the MIMO-type DVB-T set top box with the caption processing function, playing of digital audio, video and captions can be realized on an MIMO-type DVB-T set top box with a plurality of antennae.
Description
Technical field
The present invention relates to digital TV field, relate in particular to a kind of DVB-T set-top box with MIMO type of captions processing capacity.
Background technology
MIMO(Multiple-Input Multiple-Out-put) system is a core technology that applies to 802.11n.802.11n be IEEE continue 802.11b a brand-new wireless local area network technology behind the g, speed can reach 600Mbps.Simultaneously, proprietary MIMO technology can be improved the performance of existing 802.11a/b/g network.This technology is proposed in 1908 by Marconi the earliest, and he utilizes many antennas to suppress channel fading.According to the transmitting-receiving two-end antenna amount, with respect to common SISO(Single-Input Single-Output) system, MIMO can also comprise SIMO(Single-Input Multi-ple-Output) system and MISO(Multiple-Input Single-Output) system.MIMO represents multiple-input and multiple-output, is widely adopted in the 4th third-generation mobile communication technical standard, for example IEEE802.16e(Wimax), Long Term Evolution (LTE).In new generation of wireless local area network (LAN) (WLAN) standard, be generally used for IEEE802.11n, but also can be used for other 802.11 technology.MIMO is known as space diversity sometimes, because he uses multiple spatial channel to transmit and receives data.Could dispose MIMO when having only website (mobile device) or access point (AP) to support MIMO.The MIMO The Application of Technology makes the space become a kind of resource that can be used for improve performance, and can increase the coverage of wireless system.
The ground digital television broadcast DVB-T receiver that existing single antenna receives comprises taxi owing to being often used in, on the moving vehicle of bus, for the people of ride-on vehicles dismiss boring free time, obtain self required merchandise news simultaneously, but, owing to comprise taxi, it is fast that the moving vehicle of bus itself has translational speed, the unfixed characteristic in position, situation away from the place of launching centre can appear moving to, because the decline of signal, it is very weak to cause receiving signal, the problem of television-quality difference, influenced the normal play of information, therefore the MIMO technology is used for vehicle-mounted DVB-T receiver and is a development trend of present terrestrial television reception technique, in addition, since in the DVB broadcast singal with captions as being independent of audio frequency, the certain content of video and propagating, reception to it has certain professional and complexity, and the digital television receiver that seldom has the band captions to handle on the market is on sale.
Therefore, need a kind of DVB-T set-top box with MIMO type of captions processing capacity, adopt multiple-input and multiple-output MIMO technology, provide a plurality of antennas to carry out the transmission of signal at transmitter terminal, provide a plurality of antennas to carry out the reception of signal at receiver end, thereby the multiaerial system of constructing, overcome the phenomenon of multipath fading, improve the reception of TV signal, the advertising results of the Ads on Vehicles that the amusement medium company that carries out the Ads on Vehicles business releases have been ensured, to the processing of resolving and decode of the captions in the DVB broadcast singal, caption function is added in the DVB-T set-top box simultaneously specially.
Summary of the invention
In order to address the above problem, the invention provides a kind of DVB-T set-top box with MIMO type of captions processing capacity, use a plurality of antennas to receive the radiofrequency signal of MIMO type, and the radiofrequency signal that receives separated the OFDM frame, the OFDM demodulation, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo decoding of 1/2 code check is handled, to obtain to parse the transport stream TS stream of audio-video frequency content, replace original single-shot list to receive pattern with two two receipts patterns, improved the stability of receive channel, thereby ensured the quality of reception of TV signal, and in set-top box, increase special captions processing module and captions processing buffering area, make the user can watch various caption information.
According to an aspect of the present invention, a kind of DVB-T set-top box with MIMO type of captions processing capacity is provided, comprise a plurality of reception antennas, audio playing module and video playback module, a plurality of reception antennas receive the DVB-T signal of MIMO type, with the audio signal in the DVB-T signal of playing described MIMO type in audio playing module, and the vision signal in the DVB-T signal of the described MIMO type of video playback module broadcast and captions demonstration data.
More specifically, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: described a plurality of reception antennas are received in the DVB-T signal of the MIMO type that transmits in the DVB-T channel, obtain radiofrequency signal; The down-converted module, connect described a plurality of reception antenna to receive described radiofrequency signal, described radiofrequency signal is carried out analog down to be transformed on the intermediate frequency, on intermediate frequency to signal digitalized, then the signal after the digitlization is carried out Digital Down Convert, processing in the described Digital Down Convert processing module is that multichannel is handled, to receive the radiofrequency signal from described a plurality of reception antennas respectively; The channel data decoder module, connect described down-converted module to receive the signal after the Digital Down Convert, and the signal after the described Digital Down Convert that receives separated the OFDM frame successively, the OFDM demodulation, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo of 1/2 code check decodes, with the decoded transport stream TS stream of the Turbo that obtains 1/2 code check, the Turbo coding of 1/2 code check corresponding with the Turbo decoding of described 1/2 code check is used for error correction coding, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo of 1/2 code check is decoded as the single channel processing, separate the OFDM frame, OFDM is demodulated into multichannel and handles, and described TS stream has the MPEG-2 frame structure of 188 bytes; Demultiplexing module, connect described channel data decoder module with the decoded transport stream TS stream of the Turbo that receives described 1/2 code check, the decoded transport stream TS stream of the Turbo of described 1/2 code check is carried out demultiplexing, to obtain audio TS bag, video TS bag and captions TS bag respectively, audio TS bag, video TS bag and captions TS bag have different Packet Identifier PID, and described PID is used to the be responsible for assigning identifier of different value of different types of data in the TS stream after multiplexing; Separate TS bag module, connect described demultiplexing module to receive the audio TS bag, video TS bag and captions TS bag, and to the audio TS bag, video TS bag and captions TS bag carry out XieTSBao, to obtain audio frequency PES bag respectively, video PES bag and captions PES bag, described PES bag is the Digital Television elementary stream, be by to the audio compression coded data, video compression coding data or the packing of captions coded data packet also add that PES packet header forms, comprise in each PES bag and show that timestamp PTS, described PTS are used for the audio compression coded data of the described PTS of expression place PES bag, the predetermined reproduction time of video compression coding data or captions coded data; Separate PES bag module, connect described solution TS bag module to receive audio frequency PES bag, video PES bag and captions PES bag, and audio frequency PES bag, video PES bag and captions PES bag carried out XiePESBao, obtain audio compression coded data and audio frequency PTS, video compression coding data and video PTS, captions coded data and captions PTS; Captions coded data buffer, connect described solution PES bag module to obtain captions coded data and captions PTS, and according to identifier storage captions coded data and the captions PTS of the page or leaf of appointment, described page or leaf comprises combined page and auxiliary page or leaf, described combined page comprises the captions coded data that captions are exclusive, described auxiliary page or leaf comprises the captions coded data that different captions share, and the identifier of described page or leaf wraps from captions PES; The captions processing module, connect described captions coded data buffer and form a needed captions coded data of demonstration from described captions coded data buffer, to read, the captions coded data of reading is decoded, the captions that obtain a demonstration show data, the captions of a demonstration are shown that data and this captions PTS that shows needed captions coded data correspondence of composition output in the Display Register, and described one is shown as screen captions that present at screen; Display Register, connecting described captions processing module shows data and forms this with the captions that obtain a demonstration and show the captions PTS of needed captions coded data correspondence, when the current time shows the captions PTS of needed captions coded data correspondence for forming this, the captions of playing this demonstration in the video playback module of described set-top box show data, described Display Register also connects the video decode module to obtain vision signal and video PTS, when the current time is video PTS, play described vision signal in the video playback module of described set-top box; The audio decoder module connects described solution PES bag module with acquisition audio compression coded data and audio frequency PTS, and to the decoding of audio compression coded data, to obtain audio signal; The video decode module connects described solution PES bag module with acquisition video compression coding data and video PTS, and to the video compression coding data decode, to obtain vision signal; Described audio playing module connects described audio decoder module, to obtain audio signal and audio frequency PTS, when the current time is audio frequency PTS, plays described audio signal; Described video playback module connects described Display Register, shows data and vision signal to play captions, and captions show that data and vision signal are the combination display mode; Wherein, described down-converted module comprises digital controlled oscillator mixing unit, described digital controlled oscillator mixing unit produces sine and cosine ripple sample value, and with the sine and cosine ripple sample value of generation and the signal multiplication after the described digitlization in the described down-converted module, finish mixing, to obtain than the more low-frequency signal of the signal after the described digitlization.
More specifically, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: described audio playing module is the left and right acoustic channels loud speaker, and described video playback module is LCD.
More specifically, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: described demultiplexing module is carried out network information table NIT, BAT bouquet association table BAT or the service information list SDT that demultiplexing also obtains business information SI to the decoded transport stream TS stream of the Turbo of described 1/2 code check, to be used for the parsing of electronic program guide (EPG) information.
More specifically, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: the maximum length of described PES bag is the 64K byte, when forming a needed captions coded data of demonstration greater than the 64K byte, use the transmission of a plurality of captions PES bag to form this and show needed captions coded data.
Description of drawings
Below with reference to accompanying drawing embodiment of the present invention are described, wherein:
The block diagram of the DVB-T set-top box of the MIMO type with captions processing capacity that Fig. 1 illustrates according to an embodiment of the present invention.
Wherein, 1, a plurality of reception antenna; 2, down-converted module; 3, channel data decoder module; 4, demultiplexing module; 5, separate TS bag module; 6, separate PES bag module; 7, captions coded data buffer; 8, captions processing module; 9, Display Register; 10, audio decoder module; 11, video decode module; 12, audio playing module; 13, video playback module.
Embodiment
Embodiment to the DVB-T set-top box of the MIMO type with captions processing capacity of the present invention is elaborated below with reference to accompanying drawings.
Fig. 1 illustrates the block diagram of the DVB-T set-top box of the MIMO type with captions processing capacity that illustrates according to an embodiment of the present invention.The DVB-T set-top box of wherein said MIMO type comprises, a plurality of reception antennas 1, audio playing module 12 and video playback module 13, a plurality of reception antennas 1 receive the DVB-T signal of MIMO type, with the audio signal in the DVB-T signal of playing described MIMO type in audio playing module 12, and vision signal and captions in the DVB-T signal of the described MIMO type of video playback module 13 broadcasts show data.Further, the DVB-T set-top box of described MIMO type comprises that also described a plurality of reception antennas 1 are received in the DVB-T signal of the MIMO type that transmits in the DVB-T channel, obtains radiofrequency signal; Down-converted module 2, connect described a plurality of reception antenna 1 to receive described radiofrequency signal, described radiofrequency signal is carried out analog down to be transformed on the intermediate frequency, on intermediate frequency to signal digitalized, then the signal after the digitlization is carried out Digital Down Convert, processing in the described Digital Down Convert processing module 2 is that multichannel is handled, to receive the radiofrequency signal from described a plurality of reception antennas respectively; Channel data decoder module 3, connect described down-converted module 2 to receive the signal after the Digital Down Convert, and the signal after the described Digital Down Convert that receives separated the OFDM frame successively, the OFDM demodulation, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo of 1/2 code check decodes, with the decoded transport stream TS stream of the Turbo that obtains 1/2 code check, the Turbo coding of 1/2 code check corresponding with the Turbo decoding of described 1/2 code check is used for error correction coding, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo of 1/2 code check is decoded as the single channel processing, separate the OFDM frame, OFDM is demodulated into multichannel and handles, and described TS stream has the MPEG-2 frame structure of 188 bytes; Demultiplexing module 4, connect described channel data decoder module 3 with the decoded transport stream TS stream of the Turbo that receives described 1/2 code check, the decoded transport stream TS stream of the Turbo of described 1/2 code check is carried out demultiplexing, to obtain audio TS bag, video TS bag and captions TS bag respectively, audio TS bag, video TS bag and captions TS bag have different Packet Identifier PID, and described PID is used to the be responsible for assigning identifier of different value of different types of data in the TS stream after multiplexing; Separate TS bag module 5, connect described demultiplexing module 4 to receive the audio TS bag, video TS bag and captions TS bag, and to the audio TS bag, video TS bag and captions TS bag carry out XieTSBao, to obtain audio frequency PES bag respectively, video PES bag and captions PES bag, described PES bag is the Digital Television elementary stream, be by to the audio compression coded data, video compression coding data or the packing of captions coded data packet also add that PES packet header forms, comprise in each PES bag and show that timestamp PTS, described PTS are used for the audio compression coded data of the described PTS of expression place PES bag, the predetermined reproduction time of video compression coding data or captions coded data; Separate PES bag module 6, connect described solution TS bag module 5 to receive audio frequency PES bag, video PES bag and captions PES bag, and audio frequency PES bag, video PES bag and captions PES bag carried out XiePESBao, obtain audio compression coded data and audio frequency PTS, video compression coding data and video PTS, captions coded data and captions PTS; Captions coded data buffer 7, connect described solution PES bag module 6 to obtain captions coded data and captions PTS, and according to identifier storage captions coded data and the captions PTS of the page or leaf of appointment, described page or leaf comprises combined page and auxiliary page or leaf, described combined page comprises the captions coded data that captions are exclusive, described auxiliary page or leaf comprises the captions coded data that different captions share, and the identifier of described page or leaf wraps from captions PES; Captions processing module 8, connect described captions coded data buffer 7 and form a needed captions coded data of demonstration from described captions coded data buffer 7, to read, the captions coded data of reading is decoded, the captions that obtain a demonstration show data, the captions of a demonstration are shown data and form this show that the captions PTS of needed captions coded data correspondence outputs in the Display Register 9, described one is shown as screen captions that present at screen; Display Register 9, connecting described captions processing module 8 shows data and forms this with the captions that obtain a demonstration and show the captions PTS of needed captions coded data correspondence, when the current time shows the captions PTS of needed captions coded data correspondence for forming this, the captions of playing this demonstration in the video playback module 13 of described set-top box show data, described Display Register 9 also connects video decode module 13 to obtain vision signal and video PTS, when the current time is video PTS, play described vision signal in the video playback module 13 of described set-top box; Audio decoder module 10 connects described solution PES bag module 6 with acquisition audio compression coded data and audio frequency PTS, and to the decoding of audio compression coded data, to obtain audio signal; Video decode module 11 connects described solution PES bag module 6 with acquisition video compression coding data and video PTS, and to the video compression coding data decode, to obtain vision signal; Described audio playing module 12 connects described audio decoder module 10, to obtain audio signal and audio frequency PTS, when the current time is audio frequency PTS, plays described audio signal; Described video playback module 13 connects described Display Register 9, shows data and vision signal to play captions, and captions show that data and vision signal are the combination display mode; Wherein, described down-converted module 2 comprises digital controlled oscillator mixing unit, described digital controlled oscillator mixing unit produces sine and cosine ripple sample value, and with the sine and cosine ripple sample value of generation and the signal multiplication after the described digitlization in the described down-converted module 2, finish mixing, to obtain than the more low-frequency signal of the signal after the described digitlization.
Wherein, captions refer to show with written form the non-presentation content such as dialogue of TV, film, stage works the inside, also make a general reference the literal of films and television programs post-production.The voice content of program is shown in the captions mode, can help the more weak spectators of hearing to understand programme content.In addition, captions also can be used for the translate foreign languages program, allow the spectators that do not understand this foreign language, can hear the vocal cords of original work, understand programme content simultaneously.The translation of the foreign language that occurs below movie screen or television screen dialogue or other explain orally literal and all literal, as the title of film, credits present, libretto, dialogue, declarer so that personage introduction, place name and age etc. to be arranged.
Wherein, PES stream is the Digital Television elementary stream, is used for digital TV broadcast signal.Wherein, at the signal transmitting terminal, audio frequency, video and other additional datas are carried out data compression through the MPEG-2 encoder, form elementary stream, just ES flows, ES stream packing again forms the code stream that has packet header, is exactly PES(Packetized Elementary Streams), i.e. Da Bao elementary stream.Briefly, PES is ES stream packing, adds that packet header forms.
Wherein, the MPEG2 form in the DVD program is MPEG2-PS, and full name is Program Stream, and the full name of TS then is Transport Stream.MPEG2-PS is mainly used in the fixedly program of duration that has of storage, and as the DVD film, MPEG-TS then is mainly used in the program of real-time transmission, such as the TV programme of broadcasting in real time.If the front one of the vob file on the DVD is cut (perhaps simply being exactly corrupted data), will cause whole file to decode so, and TV programme is whenever to turn on television set can both decode (watching), so to be exactly requirement begin all can independently decode from arbitrary fragment of video flowing the characteristics of MPEG2-TS form.
Wherein, digital video broadcasting (DVB, Digital Video Broadcasting) is by " a series of of DVB Project maintenance are the international Digital Television Open Standard of admitting." DVB Project " be one by the industrial organization of more than 300 member compositions, it is by european telecommunications standards institute (European Telecommunications Standards Institute, ETSI), European electronic standard tissue (European Committee for Electrotechnical Standardization, CENELEC) and (the European Broadcasting Union of European Broadcasting Union, EBU) (Joint Technical Committee JTC) initiates " the joint specialist group " that constitutes jointly.DVB system transmissions mode has following several: satellite television (DVB-S and DVB-S2), cable TV (DVB-C), terrestrial television (DVB-T), hand-held terrestrial wireless (DVB-H).These standard definitions physical layer and the data link layer of transmission system.Equipment is by synchronous parallel interface (synchronous parallel interface, SPI), and synchronous serial interface (synchronous serial interface, SSI), or Asynchronous Serial Interface (asynchronous serial interface, ASI) mutual with physical layer.Data are transmitted in the mode of mpeg 2 transport stream, and require to meet stricter restriction (DVB-MPEG).The standard (DVB-H) of the instant compressed transmission data of portable terminal is among the test at present.The main distinction of these transmission meanss is the modulation system used, because the requirement difference of the different frequency bandwidths that their are used.Utilize the DVB-S of high frequency carrier to use the QPSK modulation system, utilize the DVB-C of low frequency carrier signal to use the QAM-64 modulation system, and utilize the DVB-T of VHF and UHF carrier wave to use the COFDM modulation system.
Wherein, ground digital television broadcast is part important in the radio and television system.Ground digital television broadcast has overcome not only that the artificial antenna TV is subject to disturb, poor image quality, the shortcoming of ghost image is arranged, and can also transmit nearly 8 cover TV programme in a television channel, has greatly improved the utilance of wireless frequency spectrum.The bigger variation that terrestrial DTV brings is, can stablize to receive the high quality television programme signal under mobile status, makes in-car TV, portable hand-held TV become possibility.Countries in the world government all pays much attention to the development of ground digital television broadcast, mainly contains following reason: the one, and ground digital television broadcast is public service, digitized process relates to popular interests; The 2nd, frequency resource is the public resource of society, is the non-renewable resources by governability and control; The 3rd, digital television broadcasting development meeting produces tremendous influence to the information manufacturing industry.At present, four kinds of different ground digital television broadcast transmission standards have been formed in the world, be the ATSC standard of the U.S., the DVB-T standard in Europe, the ISDB-T standard of Japan, on August 18th, 2006, China has promulgated terrestrial DTV transmission " digital television ground broadcast transmission system frame structure, chnnel coding and the modulation " national standard (standard No. is GB20600-2006) of oneself, and will be from formal enforcement on August 1 in 2007.Many countries have all carried out ground digital television broadcast in the world, and the ground digital television broadcast coverage rate of the U.S. has reached 99%.
In addition, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: described audio playing module 12 is the left and right acoustic channels loud speaker, and described video playback module 13 is LCD.The user can be according to the LCD of watching the different resolution that preference and economic capability selector top box developer customize of oneself.
In addition, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: the decoded transport stream TS stream of Turbo of 4 pairs of described 1/2 code checks of described demultiplexing module carries out network information table NIT, BAT bouquet association table BAT or the service information list SDT that demultiplexing also obtains business information SI, to be used for the parsing of electronic program guide (EPG) information.
In addition, described DVB-T set-top box with MIMO type of captions processing capacity further comprises: the maximum length of described PES bag is the 64K byte, when forming a needed captions coded data of demonstration greater than the 64K byte, use the transmission of a plurality of captions PES bag to form this and show needed captions coded data.
Adopt the DVB-T set-top box with MIMO type of captions processing capacity of the present invention, it is single to have improved original structure, the DVB-T set-top box of poor compatibility, receiving mode by many antennas receptions, overcome original channel multi-path fade-out, improve the reception of digital television program, enriched the content of ground digital television broadcast simultaneously, in original digital video-audio signal, increase additional data and electronic program guides, for the user of vehicle-mounted digital television provides more audio-visual content and guide information, satisfied many-sided demand of user, in addition, the captions processing capacity of complexity is carried out in structure arrangement and the adding DVB-T set-top box, for the user provides due captions service in the DVB digital television broadcasting.
Be understandable that though the present invention with the preferred embodiment disclosure as above, yet above-described embodiment is not in order to limit the present invention.For any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (5)
1. DVB-T set-top box with MIMO type of captions processing capacity is characterized in that described set-top box comprises:
A plurality of reception antennas, audio playing module and video playback module, a plurality of reception antennas receive the DVB-T signal of MIMO type, with the audio signal in the DVB-T signal of playing described MIMO type in audio playing module, and the vision signal in the DVB-T signal of the described MIMO type of video playback module broadcast and captions demonstration data.
2. the DVB-T set-top box with MIMO type of captions processing capacity as claimed in claim 1 is characterized in that, also comprises:
Described a plurality of reception antenna is received in the DVB-T signal of the MIMO type that transmits in the DVB-T channel, obtains radiofrequency signal;
The down-converted module, connect described a plurality of reception antenna to receive described radiofrequency signal, described radiofrequency signal is carried out analog down to be transformed on the intermediate frequency, on intermediate frequency to signal digitalized, then the signal after the digitlization is carried out Digital Down Convert, processing in the described Digital Down Convert processing module is that multichannel is handled, to receive the radiofrequency signal from described a plurality of reception antennas respectively;
The channel data decoder module, connect described down-converted module to receive the signal after the Digital Down Convert, and the signal after the described Digital Down Convert that receives separated the OFDM frame successively, the OFDM demodulation, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo of 1/2 code check decodes, with the decoded transport stream TS stream of the Turbo that obtains 1/2 code check, the Turbo coding of 1/2 code check corresponding with the Turbo decoding of described 1/2 code check is used for error correction coding, the 16QAM demodulation, the inverse ratio spy that matrix sub-clustering spiral interweaves interweaves and the Turbo of 1/2 code check is decoded as the single channel processing, separate the OFDM frame, OFDM is demodulated into multichannel and handles, and described TS stream has the MPEG-2 frame structure of 188 bytes;
Demultiplexing module, connect described channel data decoder module with the decoded transport stream TS stream of the Turbo that receives described 1/2 code check, the decoded transport stream TS stream of the Turbo of described 1/2 code check is carried out demultiplexing, to obtain audio TS bag, video TS bag and captions TS bag respectively, audio TS bag, video TS bag and captions TS bag have different Packet Identifier PID, and described PID is used to the be responsible for assigning identifier of different value of different types of data in the TS stream after multiplexing;
Separate TS bag module, connect described demultiplexing module to receive the audio TS bag, video TS bag and captions TS bag, and to the audio TS bag, video TS bag and captions TS bag carry out XieTSBao, to obtain audio frequency PES bag respectively, video PES bag and captions PES bag, described PES bag is the Digital Television elementary stream, be by to the audio compression coded data, video compression coding data or the packing of captions coded data packet also add that PES packet header forms, comprise in each PES bag and show that timestamp PTS, described PTS are used for the audio compression coded data of the described PTS of expression place PES bag, the predetermined reproduction time of video compression coding data or captions coded data;
Separate PES bag module, connect described solution TS bag module to receive audio frequency PES bag, video PES bag and captions PES bag, and audio frequency PES bag, video PES bag and captions PES bag carried out XiePESBao, obtain audio compression coded data and audio frequency PTS, video compression coding data and video PTS, captions coded data and captions PTS;
Captions coded data buffer, connect described solution PES bag module to obtain captions coded data and captions PTS, and according to identifier storage captions coded data and the captions PTS of the page or leaf of appointment, described page or leaf comprises combined page and auxiliary page or leaf, described combined page comprises the captions coded data that captions are exclusive, described auxiliary page or leaf comprises the captions coded data that different captions share, and the identifier of described page or leaf wraps from captions PES;
The captions processing module, connect described captions coded data buffer and form a needed captions coded data of demonstration from described captions coded data buffer, to read, the captions coded data of reading is decoded, the captions that obtain a demonstration show data, the captions of a demonstration are shown that data and this captions PTS that shows needed captions coded data correspondence of composition output in the Display Register, and described one is shown as screen captions that present at screen;
Display Register, connecting described captions processing module shows data and forms this with the captions that obtain a demonstration and show the captions PTS of needed captions coded data correspondence, when the current time shows the captions PTS of needed captions coded data correspondence for forming this, the captions of playing this demonstration in the video playback module of described set-top box show data, described Display Register also connects the video decode module to obtain vision signal and video PTS, when the current time is video PTS, play described vision signal in the video playback module of described set-top box;
The audio decoder module connects described solution PES bag module with acquisition audio compression coded data and audio frequency PTS, and to the decoding of audio compression coded data, to obtain audio signal;
The video decode module connects described solution PES bag module with acquisition video compression coding data and video PTS, and to the video compression coding data decode, to obtain vision signal;
Described audio playing module connects described audio decoder module, to obtain audio signal and audio frequency PTS, when the current time is audio frequency PTS, plays described audio signal;
Described video playback module connects described Display Register, shows data and vision signal to play captions, and captions show that data and vision signal are the combination display mode;
Wherein, described down-converted module comprises digital controlled oscillator mixing unit, described digital controlled oscillator mixing unit produces sine and cosine ripple sample value, and with the sine and cosine ripple sample value of generation and the signal multiplication after the described digitlization in the described down-converted module, finish mixing, to obtain than the more low-frequency signal of the signal after the described digitlization.
3. the DVB-T set-top box with MIMO type of captions processing capacity as claimed in claim 2 is characterized in that:
Described audio playing module is the left and right acoustic channels loud speaker, and described video playback module is LCD.
4. the DVB-T set-top box with MIMO type of captions processing capacity as claimed in claim 2 is characterized in that:
Described demultiplexing module is carried out network information table NIT, BAT bouquet association table BAT or the service information list SDT that demultiplexing also obtains business information SI to the decoded transport stream TS stream of the Turbo of described 1/2 code check, to be used for the parsing of electronic program guide (EPG) information.
5. the DVB-T set-top box with MIMO type of captions processing capacity as claimed in claim 2 is characterized in that:
The maximum length of described PES bag is the 64K byte, when forming a needed captions coded data of demonstration greater than the 64K byte, uses the transmission of a plurality of captions PES bag to form this and shows needed captions coded data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310183561.5A CN103248927B (en) | 2013-05-15 | 2013-05-15 | There is the DVB-T Set Top Box of the MIMO-type of captions processing capacity |
| CN201510650655.8A CN105245972B (en) | 2013-05-15 | 2013-05-15 | There is the DVB-T Set Top Box that captions process the MIMO-type of function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310183561.5A CN103248927B (en) | 2013-05-15 | 2013-05-15 | There is the DVB-T Set Top Box of the MIMO-type of captions processing capacity |
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| CN201510650655.8A Division CN105245972B (en) | 2013-05-15 | 2013-05-15 | There is the DVB-T Set Top Box that captions process the MIMO-type of function |
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| CN103248927B CN103248927B (en) | 2016-01-20 |
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| CN201310183561.5A Active CN103248927B (en) | 2013-05-15 | 2013-05-15 | There is the DVB-T Set Top Box of the MIMO-type of captions processing capacity |
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Cited By (2)
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| CN109218758A (en) * | 2018-11-19 | 2019-01-15 | 珠海迈科智能科技股份有限公司 | A kind of trans-coding system that supporting CC caption function and method |
| CN114302215A (en) * | 2021-12-29 | 2022-04-08 | 北京奕斯伟计算技术有限公司 | Video data stream decoding system, method, electronic device, and medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108174242A (en) * | 2018-01-09 | 2018-06-15 | 武汉斗鱼网络科技有限公司 | Live data multiplexing method, device, storage medium and equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105245972A (en) | 2016-01-13 |
| CN105245972B (en) | 2016-10-26 |
| CN103248927B (en) | 2016-01-20 |
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