CN105245972B - There is the DVB-T Set Top Box that captions process the MIMO-type of function - Google Patents
There is the DVB-T Set Top Box that captions process the MIMO-type of function Download PDFInfo
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- CN105245972B CN105245972B CN201510650655.8A CN201510650655A CN105245972B CN 105245972 B CN105245972 B CN 105245972B CN 201510650655 A CN201510650655 A CN 201510650655A CN 105245972 B CN105245972 B CN 105245972B
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- 239000011159 matrix material Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 5
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 230000006870 function Effects 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 13
- 230000001360 synchronised effect Effects 0.000 description 4
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- 230000007774 longterm Effects 0.000 description 1
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- 210000001260 vocal cord Anatomy 0.000 description 1
Classifications
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
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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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Radio Transmission System (AREA)
Abstract
The present invention relates to the DVB T Set Top Box of a kind of MIMO-type with captions process function, including, multiple reception antennas, audio playing module and video playback module, multiple reception antennas receive the DVB T signal of MIMO-type, to play the audio signal in the DVB T signal of described MIMO-type in audio playing module, and on video playback module, play the video signal in the DVB T signal of described MIMO-type and Subtitle Demonstration data.By means of the invention it is possible to realize the broadcasting of DAB, video and captions on the DVB T Set Top Box of MIMO-type with multiple antennas.
Description
The present invention is Application No. 201310183561.5, filing date May 15 in 2013 day,
Dividing of the patent of bright entitled " there is the DVB-T Set Top Box that captions process the MIMO-type of function "
Case application.
Technical field
The present invention relates to digital TV field, particularly relate to a kind of MIMO with captions process function
The DVB-T Set Top Box of type.
Background technology
MIMO (Multiple-Input Multiple-Out-put) system is one and applies to 802.11n
Core technology.802.11n be IEEE continue 802.11b a wireless local area network technology brand-new after g, speed
Degree is up to 600Mbps.Meanwhile, proprietary MIMO technology can improve existing 802.11a/b/g network
Performance.This technology is proposed in 1908 by Marconi the earliest, and he utilizes multiple antennas to suppress letter
Road declines.According to transmitting-receiving two-end antenna amount, relative to common SISO (Single-Input
Single-Output) system, MIMO can also include SIMO (Single-Input
Multi-ple-Output) system and MISO (Multiple-Input Single-Output) system.MIMO
Represent multiple-input and multiple-output, be widely adopted in forth generation mobile communication technology standard, such as IEEE
802.16e (Wimax), Long Term Evolution (LTE).Mark at new generation of wireless LAN (WLAN)
In standard, it is generally used for IEEE 802.11n but it also may for other 802.11 technology.MIMO has
Time be referred to as space diversity because he use multiple spatial channel transmission and receive data.Only website (moves
Dynamic equipment) or access point (AP) support to dispose MIMO during MIMO.MIMO technology
Application, make space become one and may be used for putting forward high performance resource, and wireless system can be increased
Coverage.
The ground digital television broadcast DVB-T receptor of existing single antenna reception due to often by with
On the mobile vehicle including taxi, bus, the people for ride-on vehicles dismiss boring sky
Between idle, obtain self required merchandise news simultaneously, but, owing to including taxi, public vapour
The mobile vehicle of car itself has that translational speed is fast, the unfixed characteristic in position, it may appear that move to remote
From the local situation of launching centre, due to the decline of signal, can cause receiving that signal is the most weak, TV
Ropy problem, have impact on the normal play of information, is therefore used for by MIMO technology vehicle-mounted
DVB-T receptor is a development trend of present terrestrial television receiver technology, further, since
Captions are propagated by DVB broadcast singal as independent of audio frequency, the certain content of video, to its
Receiving and have certain professional and complexity, the DTV that market seldom has band captions to process connects
Receipts machine is on sale.
Accordingly, it would be desirable to a kind of, there is the DVB-T Set Top Box that captions process the MIMO-type of function, adopt
Use multiple-input and multiple-output MIMO technology, provide multiple antennas to carry out the transmission of signal at transmitter terminal,
There is provided multiple antennas to carry out the reception of signal at receiver end, thus construct multiaerial system, next gram
Take the phenomenon of multipath fading, improve the reception of TV signal, ensured and carried out Ads on Vehicles business
The effect of advertising of Ads on Vehicles released of amusement media companies, the most specially to DVB broadcast letter
Captions in number carry out resolving and decoding process, are added by caption function in DVB-T Set Top Box.
Summary of the invention
In order to solve the problems referred to above, the invention provides a kind of MIMO-type with captions process function
DVB-T Set Top Box, use multiple antenna to receive the radiofrequency signal of MIMO-type, and to receiving
Radiofrequency signal carry out solve OFDM frame, OFDM demodulation, 16QAM demodulation, matrix sub-clustering spiral
The anti-Bit Interleave interweaved and the Turbo decoding process of 1/2 code check, can parse sound with acquisition and regard
Frequently the transport stream TS stream of content, replaces original single-shot list to receive pattern with double double receipts patterns, improves
Receive the stability of channel, thus ensure the quality of reception of TV signal, and in Set Top Box
Increase special captions processing module and captions process relief area so that user can watch various
Caption information.
According to an aspect of the present invention, it is provided that a kind of MIMO-type with captions process function
DVB-T Set Top Box, including multiple reception antennas, audio playing module and video playback module, multiple
Reception antenna receives the DVB-T signal of MIMO-type, described to play in audio playing module
Audio signal in the DVB-T signal of MIMO-type, and play described on video playback module
Video signal in the DVB-T signal of MIMO-type and Subtitle Demonstration data.
The DVB-T Set Top Box described in more specifically, with the MIMO-type that captions process function enters one
Step includes: the plurality of reception antenna receives the MIMO-type of transmission in DVB-T channel
DVB-T signal, it is thus achieved that radiofrequency signal；Down-converted module, connect the plurality of reception antenna with
Receive described radiofrequency signal, by described radiofrequency signal simulation down coversion to be transformed on intermediate frequency,
To signal digitized on intermediate frequency, then the signal after digitized is carried out Digital Down Convert, described numeral
Process in down-converted module is that multichannel processes, to receive respectively from the plurality of reception antenna
Radiofrequency signal；Channel data decoder module, connects described down-converted module to receive under numeral
Signal after frequency conversion, and carry out successively the signal after the described Digital Down Convert received solving OFDM
The anti-Bit Interleave and 1/2 that frame, OFDM demodulation, 16QAM demodulation, matrix sub-clustering spiral interweave
The Turbo decoding of code check, to obtain the Turbo of 1/2 code check decoded transport stream TS stream, with institute
The Turbo of 1/2 code check stating the Turbo decoding correspondence of 1/2 code check encodes for Error Correction of Coding,
The Turbo of 16QAM demodulation, the anti-Bit Interleave that matrix sub-clustering spiral interweaves and 1/2 code check is decoded as
Single channel processes, and solution OFDM frame, OFDM demodulation are that multichannel processes, and described TS stream has 188 words
The MPEG-2 frame structure of joint；Demultiplexing module, connects described channel data decoder module to receive institute
State the Turbo decoded transport stream TS stream of 1/2 code check, the Turbo of described 1/2 code check is decoded
After transport stream TS stream demultiplex, to obtain audio TS bag, video TS bag and captions respectively
TS bag, audio TS bag, video TS bag and captions TS bag have different PID Packet Identifier PID, institute
State PID identifier of different types of data bag distribution different value in flowing for the TS after multiplexing；Solve
TS bag module, connects described demultiplexing module to receive audio TS bag, video TS bag and captions TS
Bag, and audio TS bag, video TS bag and captions TS bag are carried out XieTSBao, to obtain respectively
Audio frequency PES bag, video PES bag and captions PES bag, described PES bag is DTV basic code
Stream, is by compressed audio coding data, video compression coding data or captions coded data packet
Packing and add that PES packet header is formed, each PES bag includes Presentation Time Stamp PTS, described
PTS is used for compressed audio coding data, the video compression coding representing in the PES bag of described PTS place
Data or the predetermined reproduction time of captions coded data；Solve PES bag module, connect described XieTSBao
Module to receive audio frequency PES bag, video PES bag and captions PES bag, and to audio frequency PES bag,
Video PES bag and captions PES bag carry out XiePESBao, it is thus achieved that compressed audio coding data and audio frequency
PTS, video compression coding data and video PTS, captions coded data and captions PTS；Captions are compiled
Code data buffer, connects described solutions PES bag module with acquisition captions coded data and captions PTS,
And storing captions coded data and captions PTS according to the identifier of the page specified, described page includes combination
Page and auxiliary page, described combined page includes the captions coded data that captions are exclusive, described auxiliary page bag
Including the captions coded data that different captions share, the identifier of described page is from captions PES bag；Captions
Processing module, connects described captions Coded Data Buffer with from described captions Coded Data Buffer
Read the captions coded data required for composition one display, the captions coded data of reading is solved
Code, it is thus achieved that one display Subtitle Demonstration data, by one show Subtitle Demonstration data and composition this
Captions PTS corresponding to captions coded data required for individual display exports in Display Register, described
One is shown as the screen captions presented on screen；Display Register, connects described captions and processes mould
Block is to obtain the Subtitle Demonstration data of a display and to form the captions coded number required for this display
According to corresponding captions PTS, when current time is the captions coded data pair required for this display of composition
During the captions PTS answered, the captions playing this display on the video playback module of described Set Top Box show
Registration evidence, described Display Register is also connected with Video decoding module to obtain video signal and video PTS,
When current time is video PTS, the video playback module of described Set Top Box is play described video
Signal；Audio decoder module, connect described solution PES bag module with obtain compressed audio coding data and
Audio frequency PTS, and compressed audio coding data are decoded, to obtain audio signal；Video decoding module,
Connect described solution PES bag module to obtain video compression coding data and video PTS, and to video pressure
Contracting coded data decodes, to obtain video signal；Described audio playing module connects described audio decoder
Module, to obtain audio signal and audio frequency PTS, when current time is audio frequency PTS, plays described
Audio signal；Described video playback module connects described Display Register, with caption playing video data
With video signal, Subtitle Demonstration data and video signal are combination display pattern；Wherein, described lower change
Frequently processing module includes digital controlled oscillator mixing unit, and described digital controlled oscillator mixing unit produces just remaining
Described in string ripple sample value, and sine and cosine ripple sample value and the described down-converted module that will produce
Signal multiplication after digitized, completes mixing, with the signal lower frequency after obtaining than described digitized
Signal.
The DVB-T Set Top Box described in more specifically, with the MIMO-type that captions process function enters one
Step includes: described audio playing module is left and right acoustic channels speaker, and described video playback module is liquid crystal
Display.
The DVB-T Set Top Box described in more specifically, with the MIMO-type that captions process function enters one
Step includes: the decoded transport stream TS of Turbo of described 1/2 code check is flow to by described demultiplexing module
Row demultiplexing also obtains the network information table NIT of business information SI, BAT bouquet association table BAT or industry
Business information table SDT, for the parsing of electronic program guide (EPG) information.
The DVB-T Set Top Box described in more specifically, with the MIMO-type that captions process function enters one
Step includes: the greatest length of described PES bag is 64K byte, when the word required for composition one display
When curtain coded data is more than 64K byte, use this display of transmission composition of multiple captions PES bag required
The captions coded data wanted.
Accompanying drawing explanation
Below with reference to accompanying drawing, embodiment of the present invention are described, wherein:
What Fig. 1 illustrated according to an embodiment of the present invention has the MIMO-type of captions process function
The block diagram of DVB-T Set Top Box.
Wherein, 1, multiple reception antenna；2, down-converted module；3, channel data decoding mould
Block；4, demultiplexing module；5, TS bag module is solved；6, PES bag module is solved；7, captions coding
Data buffer；8, captions processing module；9, Display Register；10, audio decoder module；11、
Video decoding module；12, audio playing module；13, video playback module.
Detailed description of the invention
Below with reference to accompanying drawings the present invention is had the DVB-T that captions process the MIMO-type of function
The embodiment of Set Top Box is described in detail.
Fig. 1 illustrates that the captions that have illustrated according to an embodiment of the present invention process the MIMO-type of function
The block diagram of DVB-T Set Top Box.The DVB-T Set Top Box of wherein said MIMO-type includes,
Multiple reception antennas 1, audio playing module 12 and video playback module 13, multiple reception antennas 1
Receive the DVB-T signal of MIMO-type, to play described MIMO in audio playing module 12
Audio signal in the DVB-T signal of type, and on video playback module 13, play described MIMO
Video signal in the DVB-T signal of type and Subtitle Demonstration data.Further, described MIMO
The DVB-T Set Top Box of type also includes, the plurality of reception antenna 1 receives and passes in DVB-T channel
The DVB-T signal of defeated MIMO-type, it is thus achieved that radiofrequency signal；Down-converted module 2, connects
Described radiofrequency signal, to receive described radiofrequency signal, is simulated lower change by the plurality of reception antenna 1
Signal after digitized, to be transformed on intermediate frequency, to signal digitized on intermediate frequency, is then carried out by frequency
Digital Down Convert, the process in described Digital Down Convert processing module 2 is that multichannel processes, to connect respectively
Receive the radiofrequency signal from the plurality of reception antenna；Channel data decoder module 3, connect described under
Frequency-conversion processing module 2 is with the signal after reception Digital Down Convert, and becomes under the described numeral received
Signal after Pin carries out solving OFDM frame, OFDM demodulation, 16QAM demodulation, matrix sub-clustering successively
Anti-Bit Interleave and the Turbo of 1/2 code check that spiral interweaves decode, to obtain the Turbo of 1/2 code check
Decoded transport stream TS stream, 1/2 code check corresponding with the Turbo of described 1/2 code check decoding
Turbo coding is for Error Correction of Coding, the anti-Bit Interleave that 16QAM demodulation, matrix sub-clustering spiral interweave
Being decoded as single channel with the Turbo of 1/2 code check to process, solution OFDM frame, OFDM demodulation are at multichannel
Reason, described TS stream has the MPEG-2 frame structure of 188 bytes；Demultiplexing module 4, connects institute
State the channel data decoder module 3 Turbo decoded transport stream TS stream with described 1/2 code check of reception,
The Turbo decoded transport stream TS stream of described 1/2 code check is demultiplexed, to obtain sound respectively
Frequently TS bag, video TS bag and captions TS bag, audio TS bag, video TS bag and captions TS bag
Having different PID Packet Identifier PID, described PID is dissimilar number in flowing for the TS after multiplexing
Identifier according to bag distribution different value；Solve TS bag module 5, connect described demultiplexing module 4 to receive
Audio TS bag, video TS bag and captions TS bag, and to audio TS bag, video TS bag and captions
TS bag carries out XieTSBao, to obtain audio frequency PES bag, video PES bag and captions PES bag respectively,
Described PES bag is DTV elementary stream, is by compressed audio coding data, video compress
Coded data or captions coded data packet are packed and add that PES packet header is formed, in each PES bag
Including Presentation Time Stamp PTS, described PTS for representing the audio frequency in the PES bag of described PTS place
The predetermined reproduction time of compress coding data, video compression coding data or captions coded data；Solve PES
Bag module 6, connects described solution TS bag module 5 to receive audio frequency PES bag, video PES bag and word
Curtain PES bag, and audio frequency PES bag, video PES bag and captions PES bag are carried out XiePESBao,
Obtain compressed audio coding data and audio frequency PTS, video compression coding data and video PTS, captions
Coded data and captions PTS；Captions Coded Data Buffer 7, connects described solution PES bag module 6
To obtain captions coded data and captions PTS, and store captions coding according to the identifier of the page specified
Data and captions PTS, described page includes combined page and auxiliary page, and described combined page includes captions institute solely
Some captions coded data, described auxiliary page includes the captions coded data that different captions share, described
The identifier of page is from captions PES bag；Captions processing module 8, connects described captions coded data and delays
Storage 7 is to read the captions required for composition one display from described captions Coded Data Buffer 7
Coded data, is decoded the captions coded data of reading, it is thus achieved that the Subtitle Demonstration number of a display
According to, by the captions coded data pair required for the Subtitle Demonstration data shown and this display of composition
The captions PTS answered exports in Display Register 9, and one is shown as presented on screen
Screen captions；Display Register 9, connects described captions processing module 8 to obtain the captions of a display
Captions PTS corresponding to captions coded data required for video data and this display of composition, when currently
When time is captions PTS corresponding to captions coded data required for this display of composition, at described machine
Playing the Subtitle Demonstration data of this display on the video playback module 13 of top box, described display caches
Device 9 is also connected with Video decoding module 13 to obtain video signal and video PTS, when current time is for regarding
Frequently, during PTS, the video playback module 13 of described Set Top Box is play described video signal；Audio frequency
Decoder module 10, connects described solution PES bag module 6 to obtain compressed audio coding data and audio frequency
PTS, and compressed audio coding data are decoded, to obtain audio signal；Video decoding module 11,
Connect described solution PES bag module 6 to obtain video compression coding data and video PTS, and to video
Compress coding data decodes, to obtain video signal；Described audio playing module 12 connects described sound
Frequently decoder module 10, to obtain audio signal and audio frequency PTS, when current time is audio frequency PTS,
Play described audio signal；Described video playback module 13 connects described Display Register 9, to play
Subtitle Demonstration data and video signal, Subtitle Demonstration data and video signal are combination display pattern；Its
In, described down-converted module 2 includes digital controlled oscillator mixing unit, and described digital controlled oscillator mixes
Frequently unit produces sine and cosine ripple sample value, and by the sine and cosine ripple sample value produced and described down coversion
The signal multiplication after described digitized in reason module 2, completes mixing, to obtain than described digitized
After the signal of signal lower frequency.
Wherein, captions refer to that the dialogue inside with written form display TV, film, stage works etc. is non-
Presentation content, also refers to the word of films and television programs post-production.By the voice content of program with captions side
Formula shows, the spectators that audition can be helped more weak understand programme content.It addition, captions can be used for turning over
Translate foreign language program, allow and do not understand the spectators of this foreign language, the vocal cords of original work can be heard, understand joint simultaneously
Mesh content.The translation of the foreign language dialogue occurred below movie screen or television screen or other solutions
Say word and all words, as the title of film, credits present, libretto, dialogue, declarer with
There are personage introduction, place name and age etc..
Wherein, PES stream is DTV elementary stream, in digital TV broadcast signal.Wherein,
At signal transmitting terminal, by audio frequency, video and other additional datas through MPEG-2 encoder number
According to compression, forming elementary stream, namely ES stream, ES stream is packed into the code stream with packet header again,
It is exactly PES (Packetized Elementary Streams), the elementary stream i.e. packed.Briefly,
PES is ES stream packing, adds what packet header was formed.
Wherein, the MPEG2 form in DVD program, is MPEG2-PS, and full name is Program
The full name of Stream, TS is then Transport Stream.MPEG2-PS is mainly used in the tool of storage
Having the program of fixing duration, such as DVD movie, MPEG-TS is then mainly used in transmission in real time
The TV programme of program, such as real-time broadcast.If by before the vob file on DVD one section
Cut (or being exactly simply corrupted data), then may result in whole file cannot decode, and electric
It is whenever to turn on television set to decode (watching) depending on program, so, MPEG2-TS lattice
The feature of formula requires that the arbitrary fragment from video flowing starts to be all independently to decode.
Wherein, DVB (DVB, Digital Video Broadcasting), is by " DVB
A series of DTV Open Standards recognized by the world that Project safeguards.“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), Europe electronic standard
Tissue (European Committee for Electrotechnical Standardization, CENELEC)
" the associating constituted jointly with European Broadcasting Union (European Broadcasting Union, EBU)
Expert group " (Joint Technical Committee, JTC) initiate.DVB system transfers mode has
The most several: satellite television (DVB-S and DVB-S2), cable television (DVB-C), ground
TV (DVB-T), hand-held terrestrial wireless (DVB-H).These standards define the thing of transmission system
Reason layer and data link layer.Equipment by synchronous parallel interface (synchronous parallel interface,
SPI), synchronous serial interface (synchronous serial interface, SSI), or Asynchronous Serial Interface
(asynchronous serial interface, ASI) is mutual with physical layer.Data are transmitted with MPEG-2
The mode of stream is transmitted, and requires to meet tightened up restriction (DVB-MPEG).To mobile terminal it is
Time compressed transmission data standard (DVB-H) be currently under among test.These transmission means
Differ primarily in that the modulation system of use, because the requirement of the frequency bandwidth of they application different is not
With.The DVB-S utilizing high frequency carrier uses QPSK modulation system, utilizes the DVB-C of low frequency carrier signal
Use QAM-64 modulation system, and utilize the DVB-T of VHF and UHF carrier wave to use COFDM
Modulation system.
Wherein, the ingredient that ground digital television broadcast is important in being radio and television system.Ground number
Word television broadcasting not only overcome analog radio depending on being easily disturbed, poor image quality, have ghost image lack
Point, it is also possible to transmit up to 8 set TV programme in a television channel, greatly improve wireless frequency
The utilization rate of spectrum.The larger change that terrestrial DTV brings is, stably can connect under mobile status
Receive high quality television programme signal so that in-car TV, portable hand-held TV are possibly realized.The world
National governments all pay much attention to the development of ground digital television broadcast, mainly have following reason: one is ground
Face digital television broadcasting is public service, and digitized process relates to the interests of masses；Two is frequency money
Source is the public resource of society, is the non-renewable resources by governability and control；Three is numeral electricity
Information manufacturing industry can be produced tremendous influence depending on Broadcast Development.At present, four kinds are defined in the world not
The ATSC standard of same ground digital television broadcast transmission standard, the i.e. U.S., the DVB-T in Europe
Standard, the ISDB-T standard of Japan, on August 18th, 2006, China has promulgated the ground number of oneself
Word television transmission " digital television ground broadcast transmission system frame structure, Channel Coding and Modulation " country
Standard (standard No. is GB20600-2006), and formally will implement from 1 day August in 2007.Generation
In boundary, many countries have carried out ground digital television broadcast, the ground digital television broadcast of the U.S.
Coverage rate has reached 99%.
The DVB-T Set Top Box described in it addition, with the MIMO-type that captions process function wraps further
Include: described audio playing module 12 is left and right acoustic channels speaker, and described video playback module 13 is liquid
Crystal display.According to oneself, user can watch that preference and economic capability select Set Top Box exploitation to decide through consultation
The liquid crystal display of the different resolution of system.
The DVB-T Set Top Box described in it addition, with the MIMO-type that captions process function wraps further
Include: the Turbo decoded transport stream TS stream of described 1/2 code check is carried out by described demultiplexing module 4
Demultiplexing also obtains the network information table NIT of business information SI, BAT bouquet association table BAT or business
Information table SDT, for the parsing of electronic program guide (EPG) information.
The DVB-T Set Top Box described in it addition, with the MIMO-type that captions process function wraps further
Including: the greatest length of described PES bag is 64K byte, the captions required for composition one display are compiled
When code data are more than 64K byte, use required for this display of transmission composition of multiple captions PES bag
Captions coded data.
Use the present invention has the DVB-T Set Top Box that captions process the MIMO-type of function, improves
Original structure is single, the DVB-T Set Top Box of poor compatibility, the reception received by multiple antennas
Pattern, overcomes original channel multi-path fade-out, improves the reception of digital television program, simultaneously
Enrich the content of ground digital television broadcast, original digital video-audio signal increases additional number
According to and electronic program guides, provide more audio-visual content and guide letter for the user of vehicle-mounted digital television
Breath, meets many-sided demand of user, it addition, it is whole that complicated captions process function is carried out structure
Manage and add in DVB-T Set Top Box, providing the user due captions in DVB digital television broadcasting
Service.
Although it is understood that the present invention discloses as above with preferred embodiment, but above-mentioned enforcement
Example is not limited to the present invention.For any those of ordinary skill in the art, without departing from
Under technical solution of the present invention ambit, all may utilize the technology contents of the disclosure above to the technology of the present invention
Scheme makes many possible variations and modification, or is revised as the Equivalent embodiments of equivalent variations.Therefore,
Every content without departing from technical solution of the present invention, the technical spirit of the foundation present invention is to above example
Any simple modification, equivalent variations and the modification done, all still falls within technical solution of the present invention protection
In the range of.
Claims (1)
1. one kind has the DVB-T Set Top Box that captions process the MIMO-type of function, it is characterised in that
Described Set Top Box includes:
Multiple reception antennas, audio playing module and video playback module, multiple reception antennas receive
The DVB-T signal of MIMO-type, to play described MIMO-type in audio playing module
Audio signal in DVB-T signal, and on video playback module, play described MIMO-type
Video signal in DVB-T signal and Subtitle Demonstration data；
Also include:
The plurality of reception antenna receives the DVB-T of the MIMO-type of transmission in DVB-T channel
Signal, it is thus achieved that radiofrequency signal；
Down-converted module, connects the plurality of reception antenna to receive described radiofrequency signal, by institute
State radiofrequency signal be simulated down coversion to be transformed on intermediate frequency, to signal digitized on intermediate frequency, so
Afterwards the signal after digitized is carried out Digital Down Convert, the process in described Digital Down Convert processing module
It is that multichannel processes, to receive the radiofrequency signal from the plurality of reception antenna respectively；
Channel data decoder module, connects described down-converted module to receive after Digital Down Convert
Signal, and to the signal after the described Digital Down Convert received successively carry out solve OFDM frame,
OFDM demodulation, 16QAM demodulation, the anti-Bit Interleave of matrix sub-clustering spiral intertexture and 1/2 code check
Turbo decoding, to obtain the Turbo of 1/2 code check decoded transport stream TS stream, with described
The Turbo coding of 1/2 code check of the Turbo decoding correspondence of 1/2 code check is for Error Correction of Coding, 16QAM
The Turbo of demodulation, the anti-Bit Interleave that matrix sub-clustering spiral interweaves and 1/2 code check is decoded as at single channel
Reason, solution OFDM frame, OFDM demodulation are that multichannel processes, and described TS stream has 188 bytes
MPEG-2 frame structure；
Demultiplexing module, connects described channel data decoder module to receive the Turbo of described 1/2 code check
Decoded transport stream TS stream, flows to the decoded transport stream TS of Turbo of described 1/2 code check
Row 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 PID Packet Identifier PID, and described PID is after for multiplexing
TS stream in different types of data bag distribution different value identifier；
Solve TS bag module, connect described demultiplexing module with receive audio TS bag, video TS bag and
Captions TS bag, and audio TS bag, video TS bag and captions TS bag are carried out XieTSBao, to divide
Not Huo get audio frequency PES bag, video PES bag and captions PES bag, described PES bag is DTV
Elementary stream, is by compressed audio coding data, video compression coding data or captions coded number
According to packet packing and being formed plus PES packet header, each PES bag includes Presentation Time Stamp PTS,
Described PTS is used for compressed audio coding data, the video pressure representing in the PES bag of described PTS place
Contracting coded data or the predetermined reproduction time of captions coded data；
Solve PES bag module, connect described solution TS bag module to receive audio frequency PES bag, video PES
Bag and captions PES bag, and carry out audio frequency PES bag, video PES bag and captions PES bag solving PES
Bag, it is thus achieved that compressed audio coding 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 with obtain captions coded data and
Captions PTS, and store captions coded data and captions PTS according to the identifier of the page specified, described
Page includes combined page and auxiliary page, and described combined page includes the captions coded data that captions are exclusive, institute
Stating the captions coded data that auxiliary page includes that different captions share, the identifier of described page is from captions
PES bag；
Captions processing module, connects described captions Coded Data Buffer with from described captions coded data
Buffer reads the captions coded data required for composition one display, the captions coded number that will read
According to being decoded, it is thus achieved that the Subtitle Demonstration data of a display, by the Subtitle Demonstration data shown
The captions PTS corresponding with the captions coded data required for this display of composition exports Display Register
In, one is shown as the screen captions presented on screen；
Display Register, connects described captions processing module to obtain the Subtitle Demonstration data of a display
The captions PTS corresponding with the captions coded data required for this display of composition, when current time is group
When becoming captions PTS corresponding to captions coded data required for this display, regarding of described Set Top Box
Frequently playing the Subtitle Demonstration data of this display on playing module, described Display Register is also connected with video
Decoder module is to obtain video signal and video PTS, when current time is video PTS, described
Described video signal is play on the video playback module of Set Top Box；
Audio decoder module, connects described solution PES bag module to obtain compressed audio coding data and sound
Frequently PTS, and compressed audio coding data are decoded, to obtain audio signal；
Video decoding module, connects described solution PES bag module to obtain video compression coding data and to regard
Frequently PTS, and video compression coding data are decoded, to obtain video signal；
Described audio playing module connects described audio decoder module, to obtain audio signal and audio frequency
PTS, when current time is audio frequency PTS, plays described audio signal；
Described video playback module connects described Display Register, with caption playing video data and video
Signal, Subtitle Demonstration data and video signal are combination display pattern；
Wherein, described down-converted module includes digital controlled oscillator mixing unit, and described numerical control is vibrated
Device mixing unit produces sine and cosine ripple sample value, and by the sine and cosine ripple sample value produced and described lower change
Frequently the signal multiplication after the described digitized in processing module, completes mixing, to obtain than described numeral
The signal of the signal lower frequency after change；
Described audio playing module is left and right acoustic channels speaker, and described video playback module is liquid crystal display
Device；
The Turbo decoded transport stream TS stream of described 1/2 code check is solved by described demultiplexing module
Multiplexing also obtains the network information table NIT of business information SI, BAT bouquet association table BAT or business letter
Breath table SDT, for the parsing of electronic program guide (EPG) information；
The greatest length of described PES bag is 64K byte, and the captions required for composition one display are compiled
When code data are more than 64K byte, use required for this display of transmission composition of multiple captions PES bag
Captions coded data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 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 |
| 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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| CN201310183561.5A Division 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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| CN105245972B true CN105245972B (en) | 2016-10-26 |
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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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| 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 |
| 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 |
| CN114302215B (en) * | 2021-12-29 | 2023-09-29 | 北京奕斯伟计算技术股份有限公司 | Video data stream decoding system, method, electronic device and medium |
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|---|---|---|---|---|
| EP1387501A1 (en) * | 2002-08-01 | 2004-02-04 | Sony International (Europe) GmbH | Transmitting and receiving device for a MIMO wireless communication system with adaptive antenna processing |
| CN101494774A (en) * | 2008-01-23 | 2009-07-29 | 厦门华侨电子股份有限公司 | Non-compression high definition video signal wireless transmission method based on wavelet conversion characteristics |
| CN102045588A (en) * | 2010-12-31 | 2011-05-04 | 深圳市鼎盛威电子有限公司 | Digital TV (television) advertisement and VOD (video on demand) integrated system |
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2013
- 2013-05-15 CN CN201510650655.8A patent/CN105245972B/en not_active Expired - Fee Related
- 2013-05-15 CN CN201310183561.5A patent/CN103248927B/en active Active
Patent Citations (3)
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|---|---|---|---|---|
| EP1387501A1 (en) * | 2002-08-01 | 2004-02-04 | Sony International (Europe) GmbH | Transmitting and receiving device for a MIMO wireless communication system with adaptive antenna processing |
| CN101494774A (en) * | 2008-01-23 | 2009-07-29 | 厦门华侨电子股份有限公司 | Non-compression high definition video signal wireless transmission method based on wavelet conversion characteristics |
| CN102045588A (en) * | 2010-12-31 | 2011-05-04 | 深圳市鼎盛威电子有限公司 | Digital TV (television) advertisement and VOD (video on demand) integrated system |
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| CN103248927A (en) | 2013-08-14 |
| CN105245972A (en) | 2016-01-13 |
| CN103248927B (en) | 2016-01-20 |
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