CN101252682B - Interactive digital television front end high unvoiced sound video interface system - Google Patents
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Abstract
The invention discloses an interactive type digital television front end high-definition audio-video interface system, which comprises a service station, a wireless receiving module, a signal processing module, a signal interface module, an interface converting module and a digital television terminal. The signal processing module comprises a carrier wave recovery unit, a Time Domain Synchronous Orthogonal Frequency Division Multiplex (TDS-OFDM) demodulation unit, a channel estimation unit, a synchronous recovery unit, a decoding unit and a synchronous recovery module. The wireless receiving module receives radio frequency signals carrying audio-video service transmitted by the service station. The signal processing module performs TDS-OFDM demodulation, decoding, and synchronous processing to the radio frequency signals, so as to obtain and output audio-video signals. The signal interface module receives and transmits the audio-video signals. The interface converting module converts the audio-video signals. The digital television terminal receives the audio-video signals converted by the interface converting module. The audio-video interface system of the invention can receive and process the radio frequency signals with high reliability to obtain high quality audio-video signals, the system integration degree is high, the network construction cost is low, the convergence error is small, and the convergence time is short.
Description
Technical field
The present invention relates to the digital television techniques field, relate more specifically to a kind of interactive digital television front end high unvoiced sound video interface system.
Background technology
At present, Digital Television Terrestrial Broadcasting (Digital Television Terrestrial Broadcasting, DTTB) but reached implementation phase, the DTTB transmission standard of announcing on the our times mainly contains 3 kinds: United States advanced television systems committee (Advanced Television System Committee, ATSC) the ATSC standard of Zhi Dinging, digital video broadcast-terrestrial (the Digital Video Terrestrial Broadcasting-Terrestrial in Europe, DVB-T), the floor synthetic service digital broadcasting of Japan (Integrated Service DigitalBroadcasting-Terrestrial, ISDB-T).Based on further investigation to these 3 kinds of terrestrial digital television systems, Tsing-Hua University has proposed based on time-domain synchronization OFDM (Time Domain SynchronousOrthogonal Frequency Division Multiplex, TDS-OFDM) ground digital television broadcast transmission system of modulation technique, and adopted, formulate for the DTTB standard of China by China, called after " ground digital multimedia TV broad cast (Terrestrial Digital Multimedia Television Broadcasting, DMB-T) transmission system ".
The DMB-T transmission system adopts following several major techniques:
The orthogonal multiple carrier technology of Domain Synchronous.The greatest difficulty of ground broadband wireless transmission is the frequency selective fading that multipath causes, the OFDM technology then has special advantages aspect the decline of contrary frequency selectivity.Yet the orthogonality between subcarrier is to the synchronous requirement that proposes strictness.Europe adopts the full frequency-domain processing mode to form its core technology---coded OFDM (Coded Orthogonal Frequency DivisionMultiplex, COFDM) technology, because its system synchronization and channel estimating are conditional, need with technical measures such as complicated iterative algorithm and high power synchronizing pilots.And TDS-OFDM is by time domain and frequency domain mixed processing, realized that simply and easily quick code word catches and sane synchronous tracking.
Protection pseudo random sequence (Pseudo-Noise, PN) filling technique at interval.In order to avoid intersymbol interference in the multidiameter delay spread channels, the OFDM protection interval that DVB has adopted Cyclic Prefix to fill is lost the efficient of its transmission.DMB-T has invented the height protection synchronous transmission technology based on PN sequence spread spectrum technology, and fills the OFDM protection at interval with it, makes the spectrum utilization efficiency of system improve 10%, and the above synchronous protection gain of 20dB is arranged.
The Fast Channel estimation technique.The deficiency of the iterative channel estimation process at existing terrestrial DTV transmission standard long (a time actual parameter need approximately to estimate 1.024ms), DMB-T uses new TDS-OFDM channel estimation technique, relevant and Fourier transform realization Fast Channel estimation (a time actual parameter need approximately to estimate 0.6ms) has improved system and has moved receptivity by quadrature.
The error correcting technique that forward error correction coding combines with phase mapping.At the relatively poor reality of the relative VSB single-carrier technology of signal-noise ratio threshold that adopts multicarrier COFDM technology, DMB-T has invented a kind of new system's cascade error correction ISN and minimum Eustachian distance maximization mapping techniques, makes the improvement of system signal noise ratio thresholding acquisition more than 10% of adopting multi-transceiver technology.
Frame structure with Absolute Time Synchronization.The DMB-T host-host protocol has designed the multi-frame structure with Absolute Time Synchronization, and convenient automatic arousal function setting reaches the power saving purpose, supports portable reception; The function that helps single frequency network synchronized transmission signal with Absolute Time Synchronization mechanism is controlled, and makes DMB-T single frequency network synchronizer than the easier realization of 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 called a signal frame.The frame group is defined as 255 signal frames, and its first frame definition is a frame group head.Signal frame among the frame group has unique frame number, label from 0 to 254, and signal frame number (then) is encoded in the frame synchronization sequence of current demand signal frame.Superframe is defined as a framing group, and the top layer of frame structure is called the superframe group.Superframe is numbered, from 0 to largest frames group number.Hyper Frame Number (SFN) is encoded in first frame group head of superframe with superframe group number (SFGN).SFGN is defined as the calendar date of superframe pocket transmission, and the superframe group is to carry out periodicity the cycle to repeat with a consecutive days, and it is encoded as preceding two bytes in first frame group head of a superframe among the downgoing line superframe group.At Beijing time 00:00:00AM, physical channel frame structure is reset and begins a new superframe group.A signal frame is made up of two parts: frame synchronization and frame.The baseband signalling rate of frame synchronization and frame is identical, is defined as 7.56MSps.Frame synchronizing signal adopts the random sequence of walsh codes, to realize many identification of base stations.Frame synchronization comprises preamble, frame synchronization sequence and back synchronously.Different signal frame among the signal frame group has different frame synchronizing signals.So frame synchronization can be used for identification as the frame synchronization feature of a distinctive signal frame.Frame synchronization adopt binary phase shift keying (Binary Phase Shift Key, BPSK) modulation with obtain stable synchronously.
System information transmits.The DMB-T host-host protocol has been set the frame head of unique address for the signal frame of each length 500 μ S information data, the identification that makes things convenient for data message with separate, have the technical foundation that merges multi-service broadcasting.
At present, Tsing-Hua University has applied for that at the above-mentioned technology of DMB-T transmission system patent name is " ground digital multimedia TV broad cast system ", and the patent No. is 00123597.4 patent.Described patent discloses: a kind of T-DMB television system, as shown in Figure 2, it comprises: the network control center 10, at least one transmitter 20 and at least one receiver 30, the digital code stream that is transmitted is transmitted first and second signal frames at least from the described network control center 10 give transmitter 20, transmitter 20 to aerial, is received received signal modulate emission by receiver 30.
The core technology that above-mentioned Tsing-Hua University patent adopts is the TDS-OFDM modulation technique, and its modulation step comprises: the MPEG-TS code stream of a, input is 3780 IDFT data block in frequency domain formation length through chnnel coding processing back; B, to adopt DFT that the IDFT data block is transformed to length be 3780 time domain discrete sample value frame, 7.56M/s sample value; C, to insert length at interval in the protection of OFDM be that 378 PN sequence is as frame head; D, frame head and frame are combined into time span is 550 signal frame; The FIR low pass filter that e, employing have the linear phase lag characteristic carries out frequency-domain shaping to signal; F, baseband signal is carried out up-conversion be modulated on the RF carrier wave.
From the above, the scheme of a kind of T-DMB television system and transmission thereof has been proposed at DMB-T at present, but receive the RF carrier wave that transmission system transmits for user side, and the processing of RF carrier wave is obtained audio-video signal, the better solution of neither one.
Now, because the display terminal resolution of " high definition " digital television reaches 1920 * 1080 pixels in the T-DMB television system, visual effect number, the cost performance height, so people constantly present growing trend to the demand of " high definition " digital television.Yet for above-mentioned reasons, also there is deficiency in present digital TV in high resolution to RF carrier processing audio-video signal aspect.Therefore, be necessary to provide a kind of and can high reliability receive the also interactive digital television front end high unvoiced sound video interface system of processing RF carrier wave.
Summary of the invention
The purpose of this invention is to provide a kind of interactive digital television front end high unvoiced sound video interface system, thereby the energy high reliability receives and the processing RF carrier wave obtains high-quality audio-video signal.
To achieve these goals, interactive digital television front end high unvoiced sound video interface system provided by the invention comprises service station, wireless receiving module, signal processing module, Signal interface module, interface modular converter and digital TV terminal.Described service station sends the radiofrequency signal that carries the audio frequency and video business.Described wireless receiving module receives the described radiofrequency signal that carries the audio frequency and video business.Described signal processing module carries out TDS-0FDM demodulation, decoding and Synchronous Processing with the radiofrequency signal that described wireless receiving module receives, and obtains audio-video signal, and exports this audio-video signal.Wherein, described signal processing module comprises demodulation module, decoder module and recovers module synchronously.Described demodulation module carries out the TDS-OFDM demodulation to the described radiofrequency signal that carries the audio frequency and video business, obtains baseband signal.Described decoder module is decoded to the baseband signal that described demodulation module demodulates, and obtains described audio-video code stream.Described synchronous recovery module is carried out in time domain and/or frequency domain the described audio-video code stream of described decoder module decoding output synchronously.And described demodulation module comprises carrier recovery unit, TDS-OFDM demodulating unit, channel estimating unit and synchronous recovery unit.Described carrier recovery unit is extracted the carrier signal that is used for the TDS-OFDM demodulation from the radiofrequency signal that carries the audio frequency and video business that described wireless receiving module receives.The carrier wave that described TDS-OFDM demodulating unit uses described carrier recovery unit to recover to obtain carries out demodulation to the radiofrequency signal that receives, and obtains baseband signal.Described channel estimating unit is carried out channel estimating according to the radiofrequency signal that described wireless receiving module receives, thereby the baseband signal that described TDS-OFDM demodulating unit is demodulated compensates.Described synchronous recovery unit recovers the synchronizing information of the radiofrequency signal that described wireless receiving module receives.Described Signal interface module receives the audio-video signal of described signal processing module output, and sends described audio-video signal.Described interface modular converter is changed the audio-video signal that described Signal interface module sends.Described digital TV terminal receives the audio-video signal of described interface modular converter conversion.
Preferably, described decoder module comprises deinterleaving unit and error correction decoding unit.The baseband signal of described deinterleaving unit after to described demodulation module demodulation carried out the deinterleaving conversion, and the output transform data.Described error correction decoding unit by using error correction decoding algorithm is decoded to the transform data of described deinterleaving unit output, obtains audio-video signal.
In one embodiment of the invention, described wireless receiving module comprises an antenna.
In yet another embodiment of the present invention, described Signal interface module is connected by a cable with described interface modular converter.
Compared with prior art, interactive digital television front end high unvoiced sound video interface system of the present invention can pass through wireless receiving module high reliability ground received RF signal, and handles radiofrequency signal to obtain high-quality audio-video signal by signal processing module high reliability ground.In addition, interactive digital television front end high unvoiced sound video interface system of the present invention has improved level of integrated system by wireless receiving module and the signal processing module with demodulating and decoding function are integrated.In addition, the present invention adopts the mode received RF signal of wireless access, and the use of having saved a large amount of cables or optical cable has reduced the networking cost, has also saved subscriber's line simultaneously, has reduced user cost.Moreover the mode of wireless access of the present invention has made things convenient for user's advancing equipment, has improved user experience, can be applied to mobile TV simultaneously, has enlarged application.At last, therefore the present invention need not insert the COFDM pilot signal, and directly utilize spread spectrum by adopting the TDS-OFDM technology, inserts the PN sequence, thereby carries out synchronously, channel estimating, thereby it is little to have a convergence error, the advantage that convergence time is short.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is a prior art physical channel frame structure schematic diagram.
Fig. 2 is a prior art T-DMB television system block diagram.
Fig. 3 is an interactive digital television front end high unvoiced sound video interface system network topological diagram of the present invention.
Fig. 4 is an interactive digital television front end high unvoiced sound video interface system block diagram shown in Figure 3.
Fig. 5 is the structured flowchart of signal processing module of the digital TV front-end of interactive digital television front end high resolution audio and video interface equipment shown in Figure 4.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
As shown in Figure 3-4, the interactive digital television front end high unvoiced sound video interface system of present embodiment comprises service station 500, digital TV front-end 100, cable 200, interface modular converter 300 and digital TV terminal 400.Described service station 500 sends the radiofrequency signal that carries the audio frequency and video business.Described digital TV front-end 100 comprises wireless receiving module 110, signal processing module 120 and Signal interface module 130.The wireless receiving module 110 of described digital TV front-end receives the radiofrequency signal that carries the audio frequency and video business.In the present embodiment, described wireless receiving module 110 comprises antenna.The signal processing module 120 of described digital TV front-end 100 carries out TDS-OFDM demodulation, decoding and Synchronous Processing with the radiofrequency signal that described wireless receiving module 110 receives, and obtains audio-video signal, and exports this audio-video signal.The Signal interface module 130 of described digital TV front-end 100 is connected by cable 200 with described interface modular converter 300.Described Signal interface module 130 receives the audio-video signal of described signal processing module 120 outputs, and described audio-video signal is sent to interface modular converter 300 by cable 200.After described interface modular converter 300 converted the audio-video signal of Signal interface module 130 outputs of described digital TV front-end 100 signal of the interface that is suitable for digital TV terminal 400 to, interface modular converter 300 sent to digital TV terminal 400 to described audio-video signal.Present embodiment can be realized multiport, multiple terminals access by described interface modular converter 300 is expanded.The cable 200 of present embodiment can be realized long-distance transmissions, can realize two-way interactive by the function expansion.
At length, with reference to figure 5, the signal processing module 120 of described digital TV front-end 100 comprises demodulation module 121, decoder module 122 and recovers module 123 synchronously.121 pairs of described radiofrequency signals that carry the audio frequency and video business of described demodulation module are carried out the TDS-OFDM demodulation, obtain baseband signal.The baseband signal that 122 pairs of described demodulation modules 121 of described decoder module demodulate is decoded, and obtains described audio-video code stream.The described audio-video code stream of 123 pairs of described decoder module 122 decoding outputs of described synchronous recovery module is carried out in time domain and/or frequency domain synchronously.
In the present embodiment, the demodulation module 121 of the signal processing module 120 of described digital TV front-end 100 comprises carrier recovery unit 121b, TDS-OFDM demodulating unit 121a, channel estimating unit 121c and synchronous recovery unit 121d.The carrier recovery unit 121b of described demodulation module 121 extracts the carrier signal that is used for the TDS-OFDM demodulation from the radiofrequency signal that carries the audio frequency and video business that described wireless receiving module 110 receives.The carrier wave that the TDS-OFDM demodulating unit 121a of described demodulation module 121 uses described carrier recovery unit 121b to recover to obtain carries out demodulation to the radiofrequency signal that receives, and obtains baseband signal.The channel estimating unit 121c of described demodulation module 121 carries out channel estimating according to the radiofrequency signal that described wireless receiving module 110 receives, thereby the baseband signal that described TDS-OFDM demodulating unit 121a is demodulated compensates.The synchronous recovery unit 121d of described demodulation module 121 recovers the synchronizing information of the radiofrequency signal that described wireless receiving module 110 receives.The decoder module 122 of the signal processing module 120 of described digital TV front-end 100 comprises deinterleaving unit 122a and error correction decoding unit 122b.The baseband signal of the deinterleaving unit 122a of described decoder module 122 after to described demodulation module 121 demodulation carried out the deinterleaving conversion, and the output transform data.The error correction decoding unit 122b of described decoder module 122 utilizes the error correction decoding algorithm that the transform data of described deinterleaving unit 122a output is decoded, and obtains audio-video signal.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (4)
1. interactive digital television front end high unvoiced sound video interface system comprises:
The service station, described service station sends the radiofrequency signal that carries the audio frequency and video business;
Wireless receiving module, described wireless receiving module receives the described radiofrequency signal that carries the audio frequency and video business;
Signal processing module, described signal processing module carries out TDS-OFDM demodulation, decoding and Synchronous Processing with the radiofrequency signal that described wireless receiving module receives, and obtains audio-video signal, and exports this audio-video signal;
Signal interface module, described Signal interface module receive the audio-video signal of described signal processing module output, and send described audio-video signal;
Interface modular converter, described interface modular converter are changed the audio-video signal that described Signal interface module sends; And
Digital TV terminal, described digital TV terminal receive the audio-video signal of described interface modular converter conversion;
Wherein, described signal processing module comprises:
Demodulation module, described demodulation module carries out the TDS-OFDM demodulation to the described radiofrequency signal that carries the audio frequency and video business, obtains baseband signal;
Decoder module, described decoder module is decoded to the baseband signal that described demodulation module demodulates, and obtains audio-video code stream; And
Recover module synchronously, described synchronous recovery module is carried out in time domain and/or frequency domain the described audio-video code stream of described decoder module decoding output synchronously.
Wherein, described demodulation module comprises:
Carrier recovery unit, described carrier recovery unit are extracted the carrier signal that is used for the TDS-OFDM demodulation from the radiofrequency signal that carries the audio frequency and video business that described wireless receiving module receives;
The carrier wave that TDS-OFDM demodulating unit, described TDS-OFDM demodulating unit use described carrier recovery unit to recover to obtain carries out demodulation to the radiofrequency signal that receives, and obtains baseband signal;
Channel estimating unit, described channel estimating unit is carried out channel estimating according to the radiofrequency signal that described wireless receiving module receives, thus the baseband signal that described TDS-OFDM demodulating unit is demodulated compensates;
Synchronous recovery unit, described synchronous recovery unit recover the synchronizing information of the radiofrequency signal that described wireless receiving module receives.
2. interactive digital television front end high unvoiced sound video interface system as claimed in claim 1 is characterized in that: described decoder module comprises:
Deinterleaving unit, the described deinterleaving unit baseband signal after to described demodulation module demodulation is carried out the deinterleaving conversion, and the output transform data; And
The error correction decoding unit, described error correction decoding unit by using error correction decoding algorithm is decoded to the transform data of described deinterleaving unit output, obtains audio-video signal.
3. interactive digital television front end high unvoiced sound video interface system as claimed in claim 1 is characterized in that: described wireless receiving module comprises an antenna.
4. interactive digital television front end high unvoiced sound video interface system as claimed in claim 1 is characterized in that: described Signal interface module is connected by a cable with described interface modular converter.
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| CN106658163A (en) * | 2015-10-31 | 2017-05-10 | 刘三水 | Front-end high-definition audio-video interface equipment of interactive digital television and high-definition audio-video access method thereof |
| CN106658164A (en) * | 2015-10-31 | 2017-05-10 | 刘三水 | Interactive digital television front high-definition audio and video interface system |
| CN106911951A (en) * | 2015-12-22 | 2017-06-30 | 黄秀梅 | Multifunctional network video reception terminal |
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