CN106686448A - HDTV interface and high definition audio and video access method thereof - Google Patents
HDTV interface and high definition audio and video access method thereof Download PDFInfo
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- CN106686448A CN106686448A CN201510761993.9A CN201510761993A CN106686448A CN 106686448 A CN106686448 A CN 106686448A CN 201510761993 A CN201510761993 A CN 201510761993A CN 106686448 A CN106686448 A CN 106686448A
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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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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- 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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- Multimedia (AREA)
- Signal Processing (AREA)
- Television Systems (AREA)
Abstract
The invention discloses an HDTV (High Definition Television) interface and a high definition audio and video access method thereof. The HDTV interface includes a wireless receiving module, a signal processing module and a signal interface module. The wireless receiving module receives radio frequency signals carrying audio and video service. The signal processing module performs TDS-OFDM demodulation, decoding and synchronization treatment on the radio signals received by the wireless receiving module, obtains audio and video signals and outputs the audio and video signals. The signal interface module receives the audio and video signals output by the signal processing module. According to the invention, the HDTV interface can receive and treat the radio frequency signals reliably so as to obtain high quality audio and video signals, is high in device integration level and has advantages of small convergence error and short convergence time.
Description
Technical field
The present invention relates to digital TV technology, relates more specifically to a kind of digital TV in high resolution interface.
Background technology
At present, DTTB（Digital Television Terrestrial Broadcasting, DTTB）The achievable stage is reached, the DTTB transmission standards announced on our times mainly there are 3 kinds：United States advanced television systems committee（Advanced Television System Committee, ATSC）The ATSC standards of formulation, the digital video broadcast-terrestrial in Europe（Digital
Video Terrestrial Broadcasting-Terrestrial, DVB-T）, Japan Terrestrial Integrated Service digital broadcasting（Integrated Service Digital Broadcasting-Terrestrial, ISDB-T）.Based on the further investigation to this 3 kinds of terrestrial digital television systems, Tsing-Hua University is proposed based on time-domain synchronization OFDM（Time Domain Synchronous Orthogonal Frequency
Division Multiplex, TDS-OFDM）The ground digital television broadcast transmission system of modulation technique, and the DTTB standards of China are adopted, are established as by China, it is named as " ground digital multimedia TV broad cast（Terrestrial Digital Multimedia Television Broadcasting, DMB-T）Transmission system ".
DMB-T Transmission systems adopt following items major technique：
The orthogonal multiple carrier technology of Domain Synchronous.The greatest difficulty that terrestrial wideband is wirelessly transferred is the frequency selective fading that multipath causes, and OFDM technology then has unique advantage in terms of contrary frequency Selective intensity.However, the orthogonality between subcarrier proposes strict requirements to synchronous.Europe forms its core technology using full frequency-domain processing mode --- the OFDM of coding（Coded
Orthogonal Frequency Division Multiplex, COFDM）Technology, because its system synchronization and channel estimation are conditional, need to use the technical measures such as the iterative algorithm and high power synchronizing pilot of complexity.And TDS-OFDM simply and easily realizes quick code word capture and sane synchronized tracking by time domain and frequency domain mixed processing.
Pseudo-random sequence (Pseudo-Noise, the PN) filling technique of protection interval.In order to avoid intersymbol interference, DVB to employ the OFDM protection intervals of Cyclic Prefix filling in multidiameter delay spread channels so as to which the efficiency of transmission is lost.DMB-T has been invented based on the high protection synchronous transmission technology of PN sequence spread spectrum techniques, and fills OFDM protection intervals with it, and the spectrum utilization efficiency for making system improves 10%, and has more than 20dB synchronous protection gains.
Fast Channel estimation technique.It is longer for the iterative channel estimation process of existing terrestrial DTV transmission standard（Actual parameter is estimated about to need 1.024ms）Deficiency, DMB-T uses new TDS-OFDM channel estimation techniques, realizes that Fast Channel is estimated by orthogonal related and Fourier transform（Actual parameter is estimated about to need 0.6ms）, improve system Mobile Reception Performance.
Error correcting technique of the forward error correction coding in combination with phase mapping.For the reality that the relative VSB single-carrier technologies of signal-noise ratio threshold using multicarrier COFDM technologies are poor, DMB-T has invented a kind of new system cascade error correction ISN and minimum Eustachian distance maximizes mapping techniques, makes the improvement that more than 10% is obtained using the system signal noise ratio thresholding of multi-transceiver technology.
With the frame structure of Absolute Time Synchronization.DMB-T host-host protocols devise the multi-frame structure with Absolute Time Synchronization, facilitate automatic wake-up function to arrange, and reach power saving purpose, support portable reception；With the function control that Absolute Time Synchronization mechanism is conducive to single-frequency network synchronization sending signal, DMB-T single-frequency network synchronizations equipment is set easily to realize than the same category of device of international existing standard.Its physical channel frame structure is as shown in Figure 1：
Frame structure is classification, and a basic frame structure is referred to as a signal frame.Frame group is defined as 255 signal frames, and its first frame definition is frame group head.Signal frame in frame group has unique frame number, and from 0 to 254, signal frame number (then) is encoded into the frame synchronization sequence of current demand signal frame label.Superframe is defined as a framing group, and the top layer of frame structure is referred to as superframe group.Superframe is numbered, from 0 to largest frames group number.Hyper Frame Number (SFN) is encoded into first frame group head of superframe together with superframe group number (SFGN).SFGN is defined as the calendar date of superframe pocket transmission, and superframe group is repeated cyclically with a consecutive days as the cycle, and it is encoded as the first two byte in first frame group head of a superframe in downgoing line superframe group.In Beijing time 00：00：00AM, physical channel frame structure is reset and starts a new superframe group.One signal frame is made up of two parts：Frame synchronization and frame.Frame synchronization is identical with the baseband signalling rate of frame, it is stipulated that for 7.56MSps.Frame synchronizing signal adopts the random sequence of walsh codes, to realize many identification of base stations.Frame synchronization includes preamble, frame synchronization sequence and rear synchronization.For the different signal frame in a signal frame group, there are different frame synchronizing signals.So, frame synchronization can be used to recognize as the frame synchronization feature of a distinctive signal frame.Frame synchronization adopts binary phase shift keying（Binary Phase Shift Key,
BPSK）Modulate to obtain stable synchronization.
System information is transmitted.DMB-T host-host protocols are the frame head that the signal frame of each μ S information data of length 500 sets unique address, facilitate the identification and separation of data message, the technical foundation with fusion multi-service broadcast.
At present, Tsing-Hua University has applied for patent name for " ground digital multimedia TV broad cast system ", the patent of Patent No. 00123597.4 for the above-mentioned technology of DMB-T Transmission systems.The patent diselosesll：A kind of T-DMB television system, as shown in Fig. 2 it includes：One network control center 10, at least one emitter 20 and at least one receiver 30, the digital code stream for being transmitted at least is transmitted the first and second signal frames to emitter 20 from the network control center 10, emitter 20 is transmitted into received signal modulation in the air, is received by receiver 30.
For TDS-OFDM modulation techniques, its modulation step includes the core technology that above-mentioned Tsing-Hua University's patent is adopted：A, the MPEG-TS code streams of input form the IDFT data blocks that length is 3780 after channel coding process in frequency domain；B, adopt DFT by IDFT data blocks be transformed to length for 3780 time domain discrete sample value frame, 7.56M/s sample value；C, OFDM protection interval intubating length be 378 PN sequences as frame head；D, frame head and frame are combined into the signal frame that time span is 550；E, FIR low pass filter of the employing with line phase delay characteristic carry out frequency-domain shaping to signal；F, baseband signal is carried out up-conversion modulate in RF carrier wave.
From the above, the scheme of a kind of T-DMB television system and its transmission is proposed currently for DMB-T, but for the RF carrier wave that user side receives Transmission system transmission, and audio-video signal, the more preferable solution of neither one are obtained to the process of RF carrier wave.
Now, because the display terminal resolution ratio of " high definition " digital television in T-DMB television system reaches 1920 × 1080 pixels, visual effect number, cost performance is high, therefore people constantly present growing trend to the demand of " high definition " digital television.However, for above-mentioned reasons, current digital TV in high resolution processes RF carrier wave audio-video signal aspect and there is also deficiency.Therefore, it is necessary to providing a kind of energy high reliability receives and processes the method that high resolution audio and video is accessed in the digital TV in high resolution interface and interactive digital television front end system of RF carrier wave.
The content of the invention
It is an object of the invention to provide a kind of digital TV in high resolution interface, can high reliability receive and process RF carrier wave so as to obtain high-quality audio-video signal.
To achieve these goals, the digital TV in high resolution interface that the present invention is provided includes wireless receiving module, signal processing module and Signal interface module.The wireless receiving module receives the radiofrequency signal for carrying audio frequency and video business.The radiofrequency signal that the signal processing module receives the wireless receiving module carries out TDS-OFDM demodulation, decoding and synchronization process, obtains audio-video signal, and exports the audio-video signal.The Signal interface module receives the audio-video signal of the signal processing module output.
In one embodiment of the invention, the signal processing module includes demodulation module, decoder module and synchronous recovery module.The demodulation module carries out TDS-OFDM demodulation to the radiofrequency signal for carrying audio frequency and video business, obtains baseband signal.The decoder module is decoded to the baseband signal that the demodulation module is demodulated, and obtains the audio-video code stream.The synchronous recovery module is synchronized to the audio-video code stream that the decoder module decodes output in time domain and/or frequency domain.
It is preferred that the demodulation module includes carrier recovery unit, TDS-OFDM demodulating units, channel estimating unit and synchronous recovery unit.The carrier signal for TDS-OFDM demodulation is extracted in the radiofrequency signal for carrying audio frequency and video business that the carrier recovery unit is received from the wireless receiving module.The TDS-OFDM demodulating units recover the radiofrequency signal of the carrier wave that obtains to receiving and are demodulated using the carrier recovery unit, obtain baseband signal.The channel estimating unit carries out channel estimation according to the radiofrequency signal that the wireless receiving module is received, so as to compensate to the baseband signal that the TDS-OFDM demodulating units are demodulated.The synchronous recovery unit recovers the synchronizing information of the radiofrequency signal that the wireless receiving module is received.
It is preferred that the decoder module includes deinterleaving unit and error correction decoding unit.The unit that deinterleaves is deinterleaved conversion, and output transform data to the baseband signal after demodulation module demodulation.Conversion decoding data of the error correction decoding unit using error correction decoding algorithm to the deinterleaving unit output, obtains audio-video signal.
In one embodiment of the invention, the wireless receiving module includes an antenna.
Compared with prior art, digital TV in high resolution interface of the invention can with high reliability receive radiofrequency signal by wireless receiving module, and process radiofrequency signal with high reliability to obtain high-quality audio-video signal by signal processing module.In addition, digital TV in high resolution interface of the present invention improves level of integrated system by the way that wireless receiving module and signal processing module with demodulating and decoding function are integrated.Additionally, the present invention receives radiofrequency signal by the way of wireless access, the use of a large amount of cables or optical cable is saved, reduce networking cost, while also saving subscribers' line, reduce user cost.
By description below and accompanying drawing is combined, the present invention will become more fully apparent, these accompanying drawings are used to explain embodiments of the invention.
Description of the drawings
Fig. 1 is prior art physical channel frame structure schematic diagram.
Fig. 2 is prior art T-DMB television system block diagram.
Fig. 3 is the structured flowchart of digital TV in high resolution interface of the present invention.
Fig. 4 is the structured flowchart of the signal processing module of digital TV in high resolution interface shown in Fig. 3.
Fig. 5 is the flow chart of the method that high resolution audio and video is accessed in interactive digital television front end system of the present invention.
Specific embodiment
With reference now to Description of Drawings embodiments of the invention, the element numbers being similar in accompanying drawing represent similar element.
With reference to Fig. 3, a kind of digital TV in high resolution interface of the present embodiment includes wireless receiving module 110, signal processing module 120 and Signal interface module 130.The wireless receiving module 110 receives the radiofrequency signal for carrying audio frequency and video business.The wireless receiving mould 110 includes antenna.The radiofrequency signal that the signal processing module 120 receives the wireless receiving module 110 carries out TDS-OFDM demodulation, decoding and synchronization process, obtains audio-video signal, and exports the audio-video signal.The Signal interface module 130 receives the audio-video signal of the output of the signal processing module 120.
In detail, with reference to Fig. 4, the signal processing module 120 includes demodulation module 121, decoder module 122 and synchronous recovery module 123.The radiofrequency signal of audio frequency and video business is carried described in the demodulation module 121 pairs carries out TDS-OFDM demodulation, obtains baseband signal.The baseband signal that 122 pairs of demodulation modules 121 of the decoder module are demodulated is decoded, and obtains the audio-video code stream.The audio-video code stream of 123 pairs of decoding outputs of the decoder module 122 of the synchronous recovery module is synchronized in time domain and/or frequency domain.
The demodulation module 121 of the signal processing module 120 includes carrier recovery unit 121b, TDS-OFDM demodulating unit 121a, channel estimating unit 121c and synchronous recovery unit 121d.The carrier signal for TDS-OFDM demodulation is extracted in the radiofrequency signal for carrying audio frequency and video business that carrier recovery unit 121b is received from the wireless receiving module 110.The TDS-OFDM demodulating units 121a recovers the radiofrequency signal of the carrier wave that obtains to receiving and is demodulated using carrier recovery unit 121b, obtains baseband signal.Channel estimating unit 121c carries out channel estimation according to the radiofrequency signal that the wireless receiving module 110 is received, so as to compensate to the baseband signal that the TDS-OFDM demodulating units 121a is demodulated.The synchronous recovery unit 121d recovers the synchronizing information of the radiofrequency signal that the wireless receiving module 110 is received.
The decoder module 122 of the signal processing module 120 includes deinterleaving unit 122a and error correction decoding unit 122b.The deinterleaving unit 122a is deinterleaved conversion, and output transform data to the baseband signal after the demodulation of the demodulation module 121.Conversion decoding datas of the error correction decoding unit 122b using error correction decoding algorithm to the deinterleaving unit 122a outputs, obtains audio-video signal.
With reference to Fig. 5, the method that high resolution audio and video is accessed in the interactive digital television front end system of the present invention comprises the steps：（1）Reception carries the radiofrequency signal (step S1) of audio frequency and video business；（2）The carrier signal (step S2) for TDS-OFDM demodulation is extracted from the radiofrequency signal;（3）The radiofrequency signal for receiving is demodulated using the carrier wave, obtains baseband signal (step S3);（4）Channel estimation is carried out according to the radiofrequency signal, so as to compensate (step S4) to the baseband signal;（5）The synchronizing information (step S5) of the radiofrequency signal received described in recovering；（6）Conversion, and output transform data (step S6) are deinterleaved to the baseband signal；（7）Using error correction decoding algorithm to the conversion decoding data, audio-video signal (step S7) is obtained；（8）The audio-video code stream is synchronized (step S8) in time domain or/and frequency domain；（9）The audio-video signal (step S9) is exported to terminal.
Above in association with most preferred embodiment, invention has been described, but the invention is not limited in embodiment disclosed above, and should cover modification, equivalent combinations that various essence of the invention are carried out.
Claims (5)
1. a kind of digital TV in high resolution interface, including：
Wireless receiving module, the wireless receiving module receives the radiofrequency signal for carrying audio frequency and video business；
Signal processing module, the radiofrequency signal that the signal processing module receives the wireless receiving module carries out TDS-OFDM demodulation, decoding and synchronization process, obtains audio-video signal, and exports the audio-video signal；And
Signal interface module, the Signal interface module receives the audio-video signal of the signal processing module output.
2. digital TV in high resolution interface as claimed in claim 1, it is characterised in that：The signal processing module includes：
Demodulation module, the demodulation module carries out TDS-OFDM demodulation to the radiofrequency signal for carrying audio frequency and video business, obtains baseband signal；
Decoder module, the decoder module is decoded to the baseband signal that the demodulation module is demodulated, and obtains the audio-video code stream；And
Synchronous recovery module, the synchronous recovery module is synchronized to the audio-video code stream that the decoder module decodes output in time domain and/or frequency domain.
3. digital TV in high resolution interface as claimed in claim 2, it is characterised in that：The demodulation module includes：
Carrier recovery unit, extracts the carrier signal for TDS-OFDM demodulation in the radiofrequency signal for carrying audio frequency and video business that the carrier recovery unit is received from the wireless receiving module;
TDS-OFDM demodulating units, the TDS-OFDM demodulating units recover the radiofrequency signal of the carrier wave that obtains to receiving and are demodulated using the carrier recovery unit, obtain baseband signal;
Channel estimating unit, the channel estimating unit carries out channel estimation according to the radiofrequency signal that the wireless receiving module is received, so as to compensate to the baseband signal that the TDS-OFDM demodulating units are demodulated;
Synchronous recovery unit, the synchronous recovery unit recovers the synchronizing information of the radiofrequency signal that the wireless receiving module is received.
4. digital TV in high resolution interface as claimed in claim 2, it is characterised in that：The decoder module includes：
Unit is deinterleaved, the deinterleaving unit is deinterleaved conversion, and output transform data to the baseband signal after demodulation module demodulation；And
Error correction decoding unit, conversion decoding data of the error correction decoding unit using error correction decoding algorithm to the deinterleaving unit output, obtains audio-video signal.
5. digital TV in high resolution interface as claimed in claim 1, it is characterised in that：The wireless receiving module includes an antenna.
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| CN201510761993.9A CN106686448A (en) | 2015-11-09 | 2015-11-09 | HDTV interface and high definition audio and video access method thereof |
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| CN201510761993.9A CN106686448A (en) | 2015-11-09 | 2015-11-09 | HDTV interface and high definition audio and video access method thereof |
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Application publication date: 20170517 |