CN101729757A - Wireless terminal and method for realizing audio-video signal retransmission - Google Patents
Wireless terminal and method for realizing audio-video signal retransmission Download PDFInfo
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Abstract
The invention discloses a wireless terminal for realizing audio-video signal retransmission, comprising a video/data stream conversion device used for converting digital broadcast video signals into a video data stream, an audio-video/data stream conversion device used for converting analog middle frequency audio-video signals to an audio-video data stream and a WiFi launching module used for receiving the audio-video data stream and the video data stream and converting the audio-video data stream and the video data stream to WiFi video/audio wireless broadcast signals. In the invention, by utilizing the WiFi to retransmit the audio-video signals, multiple WiFi terminals can be used for receiving the video signals, for example, a notebook computer/a mobile phone/a PDA and the like with the WiFi can be used as a receiving terminal of the audio-video signals and can also be used for applications such as video monitor/conference PPT video real-time retransmission and the like.
Description
Technical field
The present invention relates to the wireless device that one kind of multiple standard video signals WiFi transmits, particularly realize wireless terminal and the method that audio-video signal is transmitted.
Background technology
Ripe products such as analog/digital TV card are arranged in the market, as DMB, CMMB, TV rods such as DVB-C/T/H.DVB receiver and wireless network card dual-mode device are also arranged.Its basic function is a receiving digital signals, the frequency of radio frequency chip is combined under the total line traffic control of I2C and is carried out frequency sweep, and all channels in the bid carry out the mixing demodulation to the signal of program frequency point, the intermediate frequency digital media stream send baseband circuit to handle, and broadcasts video image by software interface.But can only a card one machine when being to use.Can't accomplish that the multi-user watches simultaneously.
Summary of the invention
The present invention can only pass through broadcasting and TV/multimedia such as DVB/CVBS in order to overcome the audio-video signal that exists in the prior art, the defective that forms such as S-Video are propagated is developed, therefore the purpose of this invention is to provide a kind of wireless terminal of realizing that audio-video signal is transmitted, utilize WiFi to transmit audio-video signal, can use multi-section WiFi terminal receiving video signals, as with notebook computer/mobile phone/PDA of WiFi etc. as the audio-video signal receiving terminal, also can be used as video monitoring/application such as meeting PPT real-time video forwarding.
In addition, another object of the present invention provides a kind of method that realizes that audio-video signal is transmitted.
The present invention carries out tuning and encoding and decoding with hardware circuit to vision signal, handles by PC, is transferred to the circuit framework of WiFi emitter.The present invention includes but be not limited to the stereo LR/ digital broadcasting-television signal of FM/ (DVB-T/C) and multimedia video signal such as camera, the video retransmission unit that S-Video, CVBS etc. and WiFi emitter combine.
According to first aspect present invention, realize that the wireless terminal that audio-video signal is transmitted comprises:
The digital broadcasting vision signal is converted to the video/data stream conversion device of video data stream;
The analog intermediate frequency audio-video signal is converted to the audio frequency and video/data flow conversion equipment of audio and video data streams;
Receive described audio and video data streams and video data stream, convert thereof into the WiFi transmitter module of WiFi video/audio radio broadcasting signal.
Wherein, the video/data stream conversion device comprises: the digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment to obtain the RF front-end module of IQ signal; Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain the base band demodulating module of data flow.
Wherein, described audio frequency and video/data flow conversion equipment comprises: intermediate frequency anolog TV signals or audio intermediate frequency signal are carried out mixing, ADC sampling, video decode, IQ modulate to obtain the intermediate frequency audio frequency and video front-end module of IQ signal; Described IQ signal is demodulated into the intermediate frequency audio frequency and video demodulation module of audio and video data streams.
Wherein, audio frequency and video/data flow conversion equipment also comprises the analog tuner that the PAL TV signal is modulated into the intermediate frequency anolog TV signals.
According to a second aspect of the invention, realize that the wireless terminal that audio-video signal is transmitted comprises:
Broadcast video signal is converted to the video/data stream conversion device of video data stream;
Broadcast voice signal is converted to the audio/data stream conversion device of audio data stream;
Receive described audio data stream and video data stream, convert thereof into the WiFi transmitter module of WiFi video/audio radio broadcasting signal.
Wherein said video-signal converting apparatus comprises: first change-over circuit that digital video broadcast signal is converted to video data stream; The analog video broadcasts conversion of signals is become second change-over circuit of video data stream.
Wherein said first change-over circuit comprises: the digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment to obtain the video RF front-end module of IQ signal; Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain the base band demodulating module of data flow.
Wherein said second change-over circuit comprises: Composite Video Broadcast Signal CVBS or S-Video are carried out mixing, ADC sampling, video decode, IQ modulate to obtain the intermediate frequency front-end module of IQ signal; Described IQ signal is demodulated into the intermediate frequency video demodulator module of video data stream.
Wherein said second change-over circuit also comprises: the analog tuner that the PAL TV signal is modulated into CVBS or S-Video.
Wherein said audio/data stream conversion device comprises: the audio broadcast signal that is received is carried out mixing, ADC sampling, video decode, IQ modulate to obtain the intermediate frequency audio front end module of IQ signal; Described IQ signal is demodulated into the middle frequency domain audio demodulation module of audio data stream.
According to a third aspect of the invention we, realize that the method that audio-video signal is transmitted may further comprise the steps:
A) convert the digital broadcasting vision signal to video data stream;
B) convert the analog intermediate frequency audio-video signal to audio and video data streams;
C) receive described audio and video data streams and video data stream, convert thereof into WiFi video/audio radio broadcasting signal.
Wherein said step a) comprises: the digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment, to obtain the IQ signal; Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain data flow; Detect described ADC sampling output to amplify according to the described variable gain of the strong and weak control of RSSI.
Wherein said step b) comprises: intermediate frequency anolog TV signals or audio intermediate frequency signal are carried out mixing, ADC sampling, video decode, IQ modulate to obtain the IQ signal; Described IQ signal is demodulated into audio and video data streams.
The present invention has following technique effect:
1) practical application is wide: can be used as zonule audio-video-frequency broadcast WiFi focus and cover, need not to set up professional radio and television equipment, and with low cost.Also can be used as the mobile wireless video monitoring;
2) mainly rely on software to come the medium digital stream of control hardware intermodule, the hardware designs difficulty is low, and is compatible good.
The present invention is described in detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram of wireless device first embodiment of realization audio-video signal forwarding of the present invention;
Fig. 2 is the schematic diagram of wireless device second embodiment of realization audio-video signal forwarding of the present invention;
Fig. 3 is the circuit theory diagrams that show the first embodiment details;
Fig. 4 is the wireless device of realization audio-video signal forwarding of the present invention and the flow chart of method.
Embodiment
Fig. 1 has shown wireless device first embodiment that realization audio-video signal of the present invention is transmitted.In first embodiment, realize that the wireless terminal that audio-video signal is transmitted comprises: the video/data stream conversion device that digital broadcasting vision signal DVB (representing with radio frequency among the figure) is converted to video data stream; The analog audio-video conversion of signals is become the audio frequency and video/data flow conversion equipment of audio and video data streams, and described analog audio-video signal comprises modulating FM audio signal, stereo LR audio signal, PAL vision signal, CVBS vision signal and S-Video vision signal; And receive described audio and video data streams and video data stream, convert thereof into the WiFi transmitter module of WiFi video/audio radio broadcasting signal.
Referring to Fig. 3, video data stream and audio and video data streams insert described WiFi transmitter module via the pci bus interface of PC control.
Referring to Fig. 1 and Fig. 3, the video/data stream conversion device comprises: the digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment to obtain the RF front-end module of IQ signal; Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain the base band demodulating module of data flow such as ST code stream.
Referring to Fig. 1 and Fig. 3, the base band demodulating module comprises the RSSI detector that detects ADC sampling output, and this detector amplifies according to the variable gain of the strong and weak control of video front-end module of RSSI.
Referring to Fig. 1 and Fig. 3, audio frequency and video/data flow conversion equipment comprises: intermediate frequency anolog TV signals (as CVBS vision signal or S-Video vision signal) or audio intermediate frequency signal (modulating FM audio signal or stereo LR audio signal) are carried out mixing, ADC sampling, video decode, IQ modulate to obtain the intermediate frequency audio frequency and video front-end module of IQ signal; Described IQ signal is demodulated into the intermediate frequency audio frequency and video demodulation module of audio and video data streams such as ST code stream.
Audio frequency and video/data flow conversion equipment also comprises: the PAL TV signal is modulated into the analog tuner (Fig. 1 does not show) of intermediate frequency anolog TV signals such as CVBS vision signal or S-Video vision signal so that again via intermediate frequency audio frequency and video front-end module with the sincere IQ signal of its conversion.
First embodiment can also comprise the baseband controller of local oscillating frequency, radio frequency frequency sweep and the locking frequency of described RF front-end module of control and described intermediate frequency audio frequency and video front end.As shown in Figure 3, this baseband controller can be arranged in the base band demodulating module.
Fig. 2 has shown wireless device second embodiment that realization audio-video signal of the present invention is transmitted, in a second embodiment, realize that the wireless terminal that audio-video signal is transmitted comprises: the video/data stream conversion device that broadcast video signal (as DVB or CVBS or S-Video or PAL) is converted to video data stream such as ST code stream; Broadcast voice signal (modulating FM audio signal or stereo LR audio signal) is converted to the audio/data stream conversion device of audio data stream such as ST code stream; Receive described audio data stream and video data stream, convert thereof into the WiFi transmitter module of WiFi video/audio radio broadcasting signal.
Need to prove that particular circuit configurations shown in Figure 3 can be applied to second embodiment equally.
In a second embodiment, audio data stream and video data stream insert described WiFi transmitter module (referring to Fig. 3) via the pci bus interface of PC control equally.
As shown in Figure 2, video-signal converting apparatus comprises: first change-over circuit that digital video broadcast signal is converted to video data stream; And second change-over circuit that the analog video broadcasts conversion of signals is become video data stream.
Referring to Fig. 3, first change-over circuit comprises: the digital video broadcast signal DVB that receives is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment to obtain the video RF front-end module of IQ signal; Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain the base band demodulating module of data flow.
Wherein said base band demodulating module can comprise the RSSI detector that detects described ADC sampling output, is used for the variable gain amplification according to the strong and weak control of video front-end module of RSSI.
Referring to Fig. 2, second change-over circuit comprises: Composite Video Broadcast Signal CVBS or S-Video are carried out mixing, ADC sampling, video decode, IQ modulate to obtain the intermediate frequency front-end module of IQ signal; Described IQ signal is demodulated into the intermediate frequency video demodulator module of video data stream.
Referring to Fig. 2, second change-over circuit also comprises the analog tuner that the PAL TV signal is modulated into CVBS or S-Video, so that via the sincere IQ signal of intermediate frequency front-end module conversion.
Referring to Fig. 2, the audio/data stream conversion device comprises: the audio broadcast signal that is received is carried out mixing, ADC sampling, video decode, IQ modulate to obtain the intermediate frequency audio front end module of IQ signal; Described IQ signal is demodulated into the middle frequency domain audio demodulation module of audio data stream.
In a second embodiment, the base band demodulating module equally also comprises the baseband controller of local oscillating frequency, radio frequency frequency sweep and the locking signal of control RF front-end module or intermediate frequency video front module or intermediate frequency audio front end module.
Below in conjunction with Fig. 3 the present invention is further specified.
Fig. 3 has shown the circuit theory of first embodiment, as shown in Figure 3, RF front-end module comprises: lawnmower filter (not shown), the VGA variable gain amplifier, radio frequency down-conversion device (comprising local oscillator) and quadrature section Stas loop (comprising the amplifier low pass filter that is used for I signal and the amplifier and the low pass filter that are used for Q signal).The base band demodulating module comprises: ADC (or analog to digital conversion) device of sampling, QPSK/BPSK demodulator, Viterbi decoder, Li De-Suo Luomen deinterleaver.
The DVB signal obtains quadrature IQ signal through filtering, the amplification of VGA variable gain, radio frequency down-conversion and the IQ modulation treatment of RF front-end module.ADC adopts RSSI to judge the signal power to the IQ signal, and VGA amplifies signal by the total circuit control of I2C, improves SNR; Quadrature IQ intermediate-freuqncy signal is carried out the QPSK/BPSK demodulation carry out base band ADC if sampling in the base band demodulating module after, Veterbi decoding, and Li De-Suo Luomen deinterleaves, and generating MPEG TS transmission code stream is data flow.
Intermediate frequency audio frequency and video front-end module comprises: frequency mixer, ADC sampling and (video) decoding circuit, the VGA automatic gain amplifies link, and the IQ modulation circuit, so that obtain quadrature IQ signal by mixing, ADC sampling and (video) decoding, the amplification of VGA automatic gain, IQ modulation.Intermediate frequency audio frequency and video demodulation module is similar to the base band demodulating module, is used for IQ signal transformation is become data flow.
I2C bottom control part can be provided by baseband chip; Baseband controller is to the control of radio-frequency front-end/intermediate frequency demodulation module, and as the operation of needs radio frequency frequency sweep, the I2C bus is combined configuration frequently according to radio frequency chip, sends corresponding instruction, and vibration, locking signal are combined in control frequently; By inner RSSI merit detector judgment signal power, control VGA circuit amplifies signal.The upper layer software (applications) control section is used for the initialization to all modules of native system, the distribution control of signal flow scheduling.
Above-mentioned two data are flowed through and are sent into the WiFi module by the PC bus interface, for closing, when the PC bus was sent into TS stream, put WiFi and enable the level height by software by the upper layer software (applications) default setting for the WiFi module, radio frequency is opened, and launches after the modulation of data flow process WiFi module, uppermixing, the power amplification simultaneously.
The method that realization audio-video signal of the present invention is transmitted realizes based on the said equipment, comprises the steps:
A) convert the digital broadcasting vision signal to video data stream;
B) convert the analog intermediate frequency audio-video signal to audio and video data streams;
C) receive described audio and video data streams and video data stream, convert thereof into WiFi video/audio radio broadcasting signal.
Step a) comprises: the digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment, to obtain the IQ signal; Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain data flow; And detect described ADC sampling output to amplify according to the described variable gain of the strong and weak control of RSSI.
Step b) comprises: intermediate frequency anolog TV signals or audio intermediate frequency signal are carried out mixing, ADC sampling, video decode, IQ modulate to obtain the IQ signal; Described IQ signal is demodulated into audio and video data streams.
Fig. 4 has shown the flow process the when wireless device of multiple standard video signal WiFi forwarding shown in Figure 3 is worked.
Workflow comprises: system powers on, initialization, and software selects the input signal classification to carry out the mixing demodulation, handles the WiFi emission.
If DVB-T/C signal: to the comprehensive frequency sweep that is provided with of the frequency of radio frequency chip, the calculating of concrete frequency is with reference to DATASHEET by digit chip control I2C, and upper layer software (applications) is finished the configuration that correlation is combined again and again.Allow and combine frequency of oscillation stepping from low to high frequently, system finishes frequency sweep one time, catches all channels in the frequency range, and frequency is stored.So that directly call next time.When each frequency sweep, because each frequency signal intensity difference may be bigger, the AGC control circuit of demodulation chip is to settings that gain of radio frequency chip VGA circuit, so that signal is amplified, and the raising signal to noise ratio; Catch through radio frequency, demodulation chip output TS code stream on the pci bus after, can watch the DVB-T/C program by the PC side software, the PC side software is installed in WiFi terminal-hand-held or notebook computer, comprise software-driven interface routine with WiFi hardware, control WiFi switching channels instruction repertorie carries out software decode to the digital medium-frequency signal behind the WiFi frequency locking, is presented on the LCD of handheld terminal or notebook; The WiFi order is opened in Control Software output, and the WiFi bridging chip begins initialization, and the WiFi radio frequency is opened successively, and by the encoding digital signals modulation that bridging chip transfers, mixing is launched; The user installs WiFi program receiving software at notebook computer, searches for, and can receive program stream and plays back by the software format conversion; For analog pal formula signal, software is selected hardware via configuration, the same DVB-T of mode of operation;
For if video signal, as the S-VIDEO or the family expenses broadcasting and TV set-top box/DVD disc player of notebook output, software is selected the hardware via configuration, and the audio/video coding chip carries out the ADC sampling to the different systems signal, coding is sent the digital stream signal equally and is handled to the PC bus; This function can be used for the single user WiFi emission of meeting, and multi-user WiFi terminal receives to be used, and need not projecting apparatus;
To audio intermediate frequency signal, as stereo LR signal, same software is selected the hardware via configuration, and the audio/video coding chip carries out the ADC sampling to the different systems signal, and coding is sent the digital stream signal equally and handled to the PC bus, the WiFi emission; Can cooperate the existing WiFi audio amplifier in market to use;
Equally, for the vision signal of camera input, software is selected the hardware via configuration, and coding chip carries out the ADC sampling to signal frequently, and coding is sent the digital stream signal and handled to the PC bus, the WiFi emission; Can be used for the wireless mobile WiFi terminal monitoring in sub-district.
In sum, principle of the present invention is by the wireless device of analog/digital medium circuit in conjunction with the WiFi circuit, signal flow therebetween to be led by software.
Thus, the wireless terminal of realization audio-video signal forwarding of the present invention generally includes with lower module:
Intermediate frequency audio frequency and video front-end module comprises S-Video commonly used, CVBS, and FM, stereo L/R signal input can be sampled to this type of audio-video signal, and coding and format conversion are media data flow, are sent on the pci bus;
The analog/digital RF front-end module: the radio frequency pre-process circuit-RF signal is carried out filtering, height is put; The DVB radio-frequency transmitter is the zero intermediate frequency framework substantially now, and to intermediate frequency IQ signal, demodulator circuit solves the TS transport stream to the IQ signal processing to DVB radiofrequency signal single-conversion; To the input of DVB-T/C signal, ST is arranged at present, PHILIPS, Botong company etc. all releases small low-consumption silicon tuner.Thomson is perhaps also arranged, and the CAN tuner that three magnitudes are released directly demodulates digital broadcast signal TS stream, for the decoding chip demodulation;
Use pal mode for domestic anolog TV signals, also can use the analog tuner of this type of producer, analog signal is modulated to CVBS.Again signal being carried out mpeg encoded handles;
The intermediate frequency decoder module: the present invention carries out sample code for audio-video signal, sends to pci bus and handles;
The WiFi module: the WiFi module application is commonplace at present, can select PCI WiFi module for use, and driving is provided by chip producer; If use externally, can use USB WiFi module;
Software control: plank initialization after system powers on, software detection can be carried out communication and control by I2C bus and hardware to radio frequency/baseband equipment identification, according to signal format, switch hardware path is handled and is transmitted signal, and application software is to the broadcast of video flowing.
With regard to operation principle, job step of the present invention comprises:
A, radiofrequency signal are imported by radio frequency connector, carry out mixing through the radio frequency pretreatment module, are demodulated to the IQ signal by section's Stas ring, by the encoding and decoding digit chip IQ are carried out demodulation, output video TS transport stream;
B, demodulation module and radio-frequency front-end have feedback network, form closed circuit, and signal is carried out automatic gain control; TS stream manifests image frame by the software interface interface, passes through the PC bus simultaneously, sends the WiFi radiating circuit to, and audio/video program is launched, and covers as the sub-district;
C, intermediate frequency audio-video signal can switch to corresponding hardware path and carry out ADC sampling demodulation, software processes, and WiFi launches.
The notebook computer of D, band WiFi, PDA, equipment such as mobile phone terminal install and receive application software, can search vision signal, watch program as terminal.
Therefore, the wireless device of multiple types vision signal WiFi forwarding proposed by the invention has following outstanding feature:
1) practical application is wide: can be used as zonule audio-video-frequency broadcast WiFi focus and cover, need not to set up professional radio and television equipment, and with low cost. Also can be used as mobile wireless video monitoring;
2) mainly rely on software to come the medium digital stream of control hardware intermodule, the hardware design difficulty is low, and is compatible good. The present invention can be with video signal sampling, the bimodulus forwarding unit of launching by the WiFi module after encoding and decoding are processed. So that the WiFi terminal use can share same video source simultaneously; Saved hardware cost.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention. Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.
Claims (19)
1. wireless terminal of realizing that audio-video signal is transmitted comprises:
The digital broadcasting vision signal is converted to the video/data stream conversion device of video data stream;
The analog intermediate frequency audio-video signal is converted to the audio frequency and video/data flow conversion equipment of audio and video data streams;
Receive described audio and video data streams and video data stream, the WiFi transmitter module of (compatibility that wireless Fidelity is wireless authentication) the video/audio radio broadcasting signal that converts thereof into WiFi.
2. wireless terminal according to claim 1, wherein said video data stream and audio and video data streams insert described WiFi transmitter module via the pci bus interface of PC control.
3. wireless terminal according to claim 1, wherein said video/data stream conversion device comprises:
To the digital video broadcast signal of receiving carry out filtering, variable gain amplification, down-conversion and IQ (In-phase, Quadrature-phase) modulation treatment is to obtain the RF front-end module of IQ signal;
Described IQ signal is carried out ADC (analog-to-digital conversion) sampling, demodulation, decodes and deinterleave and handle to obtain the base band demodulating module of data flow.
4. wireless terminal according to claim 3, wherein said base band demodulating module comprises RSSI (indication of the received signal strength indication received signal intensity) detector that detects described ADC sampling output, is used for amplifying according to the variable gain of the strong and weak control of video front-end module of RSSI.
5. wireless terminal according to claim 1, wherein said audio frequency and video/data flow conversion equipment comprises:
Intermediate frequency anolog TV signals or audio intermediate frequency signal are carried out mixing, ADC sampling, video decode, IQ to be modulated to obtain the intermediate frequency audio frequency and video front-end module of IQ signal;
Described IQ signal is demodulated into the intermediate frequency audio frequency and video demodulation module of audio and video data streams.
6. wireless terminal according to claim 5, wherein said audio frequency and video/data flow conversion equipment also comprises: PAL (Phase Alternating Line, line-by-line inversion) TV signal is modulated into the analog tuner of intermediate frequency anolog TV signals.
7. according to claim 3 or 5 described wireless terminals, also comprise the baseband controller of local oscillating frequency, radio frequency frequency sweep and the semaphore lock of described RF front-end module of control and described intermediate frequency audio frequency and video front end.
8. wireless terminal of realizing that audio-video signal is transmitted comprises:
Broadcast video signal is converted to the video/data stream conversion device of video data stream;
Broadcast voice signal is converted to the audio/data stream conversion device of audio data stream;
Receive described audio data stream and video data stream, convert thereof into the WiFi transmitter module of WiFi video/audio radio broadcasting signal.
9. wireless terminal according to claim 8, wherein said audio data stream and video data stream insert described WiFi transmitter module via PCI (the Peripheral Component Interconnect) bus interface of PC control.
10. wireless terminal according to claim 8, wherein said video-signal converting apparatus comprises:
Digital video broadcast signal is converted to first change-over circuit of video data stream;
The analog video broadcasts conversion of signals is become second change-over circuit of video data stream.
11. wireless terminal according to claim 10, wherein said first change-over circuit comprises:
The digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment to obtain the video RF front-end module of IQ signal;
Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain the base band demodulating module of data flow.
12. wireless terminal according to claim 11, wherein said base band demodulating module comprise the RSSI detector that detects described ADC sampling output, are used for the variable gain amplification according to the strong and weak control of video front-end module of RSSI.
13. wireless terminal according to claim 10, wherein said second change-over circuit comprises:
Composite Video Broadcast Signal CVBS or S-Video are carried out mixing, ADC sampling, video decode, IQ to be modulated to obtain the intermediate frequency front-end module of IQ signal;
Described IQ signal is demodulated into the intermediate frequency video demodulator module of video data stream.
14. wireless terminal according to claim 13, wherein said second change-over circuit also comprises:
The PAL TV signal is modulated into the analog tuner of CVBS or S-Video.
15. wireless terminal according to claim 8, wherein said audio/data stream conversion device comprises:
The audio broadcast signal that is received is carried out mixing, ADC sampling, video decode, IQ to be modulated to obtain the intermediate frequency audio front end module of IQ signal;
Described IQ signal is demodulated into the middle frequency domain audio demodulation module of audio data stream.
16. according to claim 11 or 13 or 15 described wireless terminals, described base band demodulating module also comprises the baseband controller of local oscillating frequency, radio frequency frequency sweep and the locking signal of control RF front-end module or intermediate frequency video front module or intermediate frequency audio front end module.
17. a method that realizes that audio-video signal is transmitted may further comprise the steps:
A) convert the digital broadcasting vision signal to video data stream;
B) convert the analog intermediate frequency audio-video signal to audio and video data streams;
C) receive described audio and video data streams and video data stream, convert thereof into WiFi video/audio radio broadcasting signal.
18. method according to claim 17, wherein said step a) comprises:
The digital video broadcast signal of receiving is carried out filtering, variable gain amplification, down-conversion and IQ modulation treatment, to obtain the IQ signal;
Described IQ signal is carried out ADC sampling, demodulation, decodes and deinterleave and handle to obtain data flow;
Detect described ADC sampling output to amplify according to the described variable gain of the strong and weak control of RSSI.
19. method according to claim 17, wherein said step b) comprises:
Intermediate frequency anolog TV signals or audio intermediate frequency signal are carried out mixing, ADC sampling, video decode, IQ to be modulated to obtain the IQ signal;
Described IQ signal is demodulated into audio and video data streams.
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