CN1256846C - Radio video-audio transceiving system - Google Patents
Radio video-audio transceiving system Download PDFInfo
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- CN1256846C CN1256846C CN 03126984 CN03126984A CN1256846C CN 1256846 C CN1256846 C CN 1256846C CN 03126984 CN03126984 CN 03126984 CN 03126984 A CN03126984 A CN 03126984A CN 1256846 C CN1256846 C CN 1256846C
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Abstract
The present invention discloses a radio video-audio transmitting and receiving system. The transmitting and receiving device comprises power supply circuit, a transmitting circuit, a transmitting microprocessor, a receiving circuit, receiving microprocessor, video switching circuit, etc., wherein the video switching circuit is used for receiving computer video signals of VGA, SVGA, XGA, etc., and converting the computer video signals into an S-VHS video signal in an NTSC/PAL system and a composite video signal which is provided for the transmitting circuit; a signal switching circuit is arranged in the video switching circuit, and the signal switching circuit is used for sending the composite video signal, the audio signal or external input audio-video signals to the transmitting circuit after amplification filtration and cushioning, and the composite video signal, the audio signal or the external input audio-video signals are provided by the video switching circuit; radio transmission is carried out to audio frequency and video frequency. The present invention can be widely applied to business in brief demonstration, interactive training, computer classroom teaching, marriage dress video tape manufacture, family entertainment net surfing, information distribution, TV walls, etc.
Description
Technical field
The present invention relates to a kind of wireless audio and video receive-transmit system, more particularly, it relates to a kind of system that transmits and receives of wireless audio and video transmission of the XGA-to-TV of can be used for video conversion.
Background technology
In recent years, the audio frequency and video transmission product that has occurred shape form formula on the market, but relate to the same video formats (PAL-PAL of TV-to-TV mostly, NTSC-NTSC) wireless transmission between, wireless transmission between the PC-to-TV different systems if desired, the VGA-to-TV video converter of then must plugging in addition.In like manner, video converter adopts wire transmission, is subjected to concrete environmental limit bigger, in the radio transmitting device use of just must plugging into of some occasion.
At present, relatively the operating frequency of Chang Yong TV-TO-TV wireless audio and video transmission system has: 0.9G, 1.2G, 1.3G, 2.4G etc., wherein the frequency of the operating frequency of 0.9G system and gsm system is approaching, and present global each corner of the mobile phone signal network coverage, if adopt near the frequency this frequency range to cause interference to transmitting device, thereby directly have influence on the effect of transmitting device, so frequency range is not suitable for present use; 1.2G system applies is the most universal, and certain ability that penetrates barrier is also arranged, but has radiation and human body that certain harm is arranged to environment; 2.4G～2.4835GHz belongs to the S frequency range, it is industrial science medical treatment frequency range that this frequency range also is ISM (industry science medical), belong to industrial free radiation frequency range, this frequency range is not limited by the international wireless electricity committee more, can not damage health; This working frequency range disturbs few, and the picture quality laser propagation effect is better.
The XGA-TO-TV video converter of using can receive the VGA from any PC, notebook computer at present, SVGA or XGA signal, and convert the vision signal of NTSC or pal mode to, the XGA-TO-TV video converter carries out the RGB analog signal at first respectively the A/D signal of 8BIT) conversion, the conversion back forms the digital signal of RGB.The synchronizing signal of VGA generates corresponding sequential simultaneously.Carry out Flic-Free then
TMFiltering; Be converted into the vision signal of simulation again through D/A through the digital video signal behind the Flic-Free filter filtering.Can export S-Video vision signal and Composite composite video signal simultaneously.Because adopt wire transmission mode, transmission range, adapter path etc. is subjected to bigger restriction, dismounting, mobile inconvenience, cable wiring manufacture is loaded down with trivial details.
Because the problem difference to be solved of different product, the technical scheme difference of taking, the electrical characteristic difference of product lacks the integral body of systematic function is considered, so the video conversion simply is connected with wireless transmission and just has the matching problem of different product, its overall performance is also not fully up to expectations; Use also inconvenient.
Summary of the invention
One of purpose of the present invention is in order to overcome above-mentioned the deficiencies in the prior art, provide a kind of can be with computer VGA, SVGA or XGA vision signal convert that quality is higher to, good stability and the S-VHS vision signal of high definition and the wireless audio and video transmission system of composite video signal.
Another object of the present invention is to improve the useful life and the saves energy of radiating circuit.
Another purpose of the present invention is can be with computer VGA, and SVGA or XGA vision signal convert the output of PAL/NTSC TV signal to, and the PAL/NTSC TV signal that the outside can be provided is directly carried out the wireless audio and video transmission system of wireless transmission and reception again.
For achieving the above object, the present invention takes following technical scheme:
A kind of wireless audio and video receive-transmit system comprises:
Radiating circuit is used for composite video signal and audio signal being modulated and launching;
Receiving circuit is used to receive the modulation signal that radiating circuit is launched, and output is reduced to corresponding composite video signal and audio signal;
Video conversion circuit, be used to receive VGA from any PC, notebook computer, digital video signal such as SVGA or XGA, convert thereof into the S-VHS vision signal and the composite video signal of NTSC or pal mode, and this composite video signal is delivered to described radiating circuit emission after amplifying buffering, filtering.
Described video conversion circuit comprises input interface circuit, the video conversion chip, the composite video signal filter network, S-VHS vision signal filter network and output interface circuit, the composite video signal filter network comprises a LC filter network and a Л type filter network at least, S-VHS vision signal filter network comprises the 2nd LC filter network and the 2nd Л type filter network at least, rgb signal is the input video conversion chip behind input interface circuit, after the video conversion chip converts the rgb signal of importing to composite video signal and S-VHS vision signal, composite video signal is earlier after connect corresponding output interface circuit after a LC filter network and the Л type filter network filtering, and the S-VHS vision signal is earlier after connect corresponding output interface circuit after the 2nd LC filter network and the 2nd Л type filter network filtering.
Described radiating circuit comprises emission microprocessor U1, emission power circuit and transmitter module, the emission power circuit comprises controlled voltage stabilizing circuit and power control circuit, power supply connects controlled voltage stabilizing circuit after filtering, controlled voltage stabilizing circuit is output as radiating circuit required operating voltage is provided, the size of controlled voltage stabilizing circuit output voltage is controlled by power control circuit, the control signal of being sent by emission microprocessor U1 connects power control circuit, be used for when not having transmiting signal source, control controlled voltage stabilizing circuit by the emission microprocessor and be in power down mode.
Described controlled voltage stabilizing circuit comprises the adjustable voltage stabilizing chip of three ends, described power control circuit comprises triode, power supply connects the voltage input end of the adjustable voltage stabilizing chip of three ends after filtering, the control signal of being sent by emission microprocessor U1 connects the base stage of triode, the collection utmost point of triode connects the voltage-regulation end of the adjustable voltage stabilizing chip of described three ends, and the voltage output end of three ends are adjustable voltage stabilizing chip provides required operating voltage for radiating circuit.
Described radiating circuit comprises vision signal commutation circuit and audio signal commutation circuit, vision signal commutation circuit and audio signal commutation circuit are by the control of emission microprocessor, the vision signal commutation circuit outputs to described transmitter module to carrying out switching controls through the video video signal converted with the outside vision signal that inserts, and the audio signal commutation circuit outputs to described radiating circuit to carrying out switching controls from the audio signal of any computer with the outside audio signal that inserts.
By to the each part mentioned above Circuit Optimization, the technique effect that the present invention gives prominence to is:
1, by the composite video signal filter network that comprises a LC filter network and a Л type filter network at least being set and the S-VHS vision signal filter network that comprises a LC filter network and a Л type filter network at least being set, can disturb the interference noise of coming in the effectively filtering outer signals, output quality is higher, the S terminal signals and the composite video signal of good stability and high definition, video conversion system can be with 640 * 480 (up to 85Hz), 800 * 600 (up to 75Hz) 1024 * 768 (up to 60Hz) become the vision signal of NTSC or pal mode up to the image transitions of 16.7 million true color.
2, the emission power circuit that comprises controlled voltage stabilizing circuit and power control circuit by setting, by launching the control signal connection control circuit that microprocessor U1 sends, when not having transmiting signal source, control controlled voltage stabilizing circuit by the emission microprocessor and be in power down mode, control whole video converting system is in the energy saver mode of low-power consumption, has increased the useful life and the saves energy of radiating circuit.
3, by vision signal commutation circuit and audio signal commutation circuit are set, can output to described transmitter module to carrying out switching controls with the outside vision signal that inserts, can output to described radiating circuit carrying out switching controls with the outside audio signal that inserts from the audio signal of any computer through the video video signal converted.
Description of drawings
Fig. 1 is the video conversion circuit schematic diagram of wireless audio and video receive-transmit system;
Fig. 2 is the conversion chip internal structure block diagram in the video conversion circuit;
Fig. 3 is the radio-frequency transmissions circuit theory diagrams of wireless audio and video receive-transmit system;
Fig. 4 is the receiving circuit schematic diagram of wireless audio and video receive-transmit system.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing 1 to 4:
A kind of wireless audio and video receive-transmit system is made up of wireless audio and video emitter and wireless audio and video receiving system.
The wireless audio and video emitter comprises video conversion circuit and radiating circuit, and receiving system comprises: receive power circuit and receiving circuit.
Fig. 1 is a video conversion circuit, comprises input interface circuit, video conversion chip, the driving of RGB_BUF buffering, SDRAM buffer memory, function expansion, reset circuit SWITCH, composite video signal filter network, S-VHS vision signal filter network and output interface circuit.Wherein input interface VGA-IN is the socket of one 8 pins; The video conversion chip is AT2139, and Fig. 2 is the conversion chip internal structure block diagram in the video conversion circuit, and the effect of this chip is that the rgb signal that will import converts composite video signal and S-VHS vision signal to; A Л type filter network of being made up of C114, C115, C116, C117, L108, L109 of LC filter network that the composite video signal filter network is made of L103, C105 and back is formed; S-VHS vision signal filter network is made up of two groups of LC filtering and filtering of Л type with spline structure, the 2nd Л type filter network of forming by C106, C107, C108, C109, L104, L105 of the 2nd LC filter network that constitutes by L101, C103 and back respectively, another the 2nd Л type filter network of forming by C110, C111, C112, C113, L106, L107 of another the 2nd LC filter network that constitutes by L102, C104 and back; DRAM buffer memory 2402 is used for the parameter of storage system; The function expanded circuit can be realized the amplification of image, dwindles the adjusting of aspects such as brightness.
The VGA signal of exporting on computer or the miscellaneous equipment is imported from VGA_IN, signal is divided into rgb signal and V, H synchronizing signal, rgb signal is sent into the driving of RGB_BUF buffering and is carried out processing and amplifying, amplify to wait and handle two groups of signals of back output, send into video conversion chip (AT2139) for one group, carry out the video conversion process that converts at a high speed, V, H synchronizing signal are then through R105, C101 and R106 send into the video conversion chip and handle after the C102 filtering.The video conversion chip is handled respectively, exports V, H synchronizing signal, S terminal signals and composite video signal respectively after converting at a high speed.V, the H synchronizing signal of output output to the VGA_OUT interface.Simultaneously, rgb signal is sent into another group analog rgb signal after processing and amplifying is carried out in the driving of RGB_BUF buffering, and directly output is used to connect terminal presentation facilities such as display, monitoring.Because of various input signals all are through RGB_BUF and the video conversion chip amplifies, various processing reduction such as filtering, and can be weak because of decomposition after not worrying delivering to the VGA display through the VGA signal after the processing and amplifying.The S terminal signals and the composite video signal of the output of video conversion chip are admitted to LC filter network efficiently, carry out the Л type filtering second time, export behind the interference noise that interference is come in the filtering outer signals, composite video signal outputs to the VEDIOA end behind the JI type filter network that C114, C115, C116, C117, L108, the L109 of the LC of L103, C105 filter network and back form; The Y of S terminal signals, C signal are then respectively by with exporting behind the LC filtering of spline structure and the Л type filtering two-stage filter network.The SDRAM buffer memory cooperates the video conversion chip to carry out treatment of picture simultaneously.S terminal signals and composite video signal with can output quality higher, good stability and high definition.SWITCH provides reset signal required in the circuit then for the video conversion chip. guaranteed the power surges the when user starts shooting and the various bad phenomenon that directly have influence on machine performance such as deadlock that cause; The SWITCH circuit also provides the dwindling of image, amplified, moved to left, moved to right, on move, move down translation function with standard.
Fig. 2 is video conversion chip AT2139 internal process figure, and the RGB analog signal is carried out A/D (A/D is that analog signal conversion the is a digital signal) conversion of 8BIT at first respectively, and the conversion back forms the digital signal of RGB.The synchronizing signal of VGA generates corresponding sequential simultaneously.The digital signal of RGB is carried out color separated earlier, carries out Flic-Free then
TMFiltering.Flic-Free
TMBe a kind of digital filter of anti-flicker, it acts on the image flicker phenomenon that prevents that display device from being occurred in the course of the work, thereby reduces the Bi Laodu of eyes, prevents to cause the further injury to eyes.It can provide 4 grades of different filter states this filter.And a kind of built-in color-bar test pattern is provided, rebuild and test signal as video, and select to provide reference point for filtering.Convert thereof into the vision signal of NTSC or pal mode through the digital video signal behind the Flic-Free filter filtering.The conversion of scanning frequency is finished by external memory storage EDO.Digital video signal is converted into the vision signal of simulation again through the D/A of 10BIT.After the filter circuit that is formed by FB inductance and electric capacity carries out filtering, be output into the composite video signal of simulation.
Video conversion system can be with 640 * 480 (up to 85Hz), and 800 * 600 (up to 75Hz) 1024 * 768 (up to 60Hz) become the vision signal of NTSC or pal mode up to the image transitions of 16.7 million true color.All Video processing are all handled with digital signaling.Owing in D/A converter, adopted super depth-sampling (Oversampling) technology, thereby made the simulation output filter very simple.Three output pins array output simultaneously composite video signal of master chip.Video conversion system is supported VESA DPMS power save mode, is in the energy saver mode of low-power consumption simultaneously by master control system control whole video converting system.
Fig. 3 is the radio-frequency transmissions circuit theory diagrams, and radiating circuit comprises that signal switching circuit, emission microprocessor U1, emission power circuit and transmitter module VM_T2AS form.
The emission power circuit comprises that power supply connects controlled voltage stabilizing circuit after filtering, controlled voltage stabilizing circuit is output as radiating circuit required operating voltage is provided, the size of controlled voltage stabilizing circuit output voltage is controlled by power control circuit, the control signal of being sent by emission microprocessor U1 connects power control circuit, be used for when not having transmiting signal source, control controlled voltage stabilizing circuit by the emission microprocessor and be in power down mode.
As shown in Figure 3, the emission power circuit comprises controlled voltage stabilizing circuit, constant voltage circuit and power control circuit, controlled voltage stabilizing circuit adopts the adjustable voltage stabilizing chip of three ends U13 (LM317) to reach the purpose of adjustable voltage, power control circuit comprises triode Q14, power supply meets the voltage input end Vin of the adjustable voltage stabilizing chip of three ends U13 (LM317) after filtering, the control signal of being sent by emission microprocessor U1 connects the base stage of triode Q14, the emitter grounding of triode Q14, the collection utmost point of triode Q14 meets the voltage-regulation end ADJ of the adjustable voltage stabilizing chip of three ends U13, and the voltage output end Vout of three ends are adjustable voltage stabilizing chip provides adjustable operating voltage for the wireless audio and video radiating circuit.Constant voltage circuit adopts LM7805 high stability power module, provides required operating voltage by LM7805 high stability power module for transmitter module.
The course of work: power supply VIN is through capacitor C 40, send into the IN end of the adjustable voltage stabilizing chip of three ends U13 after the C32 filtering, the OUT end of U13 obtains output voltage TAVCC after capacitor C 31 filtering, external control voltage DRtxvcc is through the base stage of resistance R 95 input triode Q14, series resistor R73 between the ADJ of U13 end and OUT end, one end of resistance R 68 and the collector electrode of triode Q14 connect the ADJ end of U13 jointly, the emitter-base bandgap grading common ground of the other end and triode Q14, voltage TAVCC is subjected to resistance R 68, the influence of R73 and triode Q14, the emission microcontroller circuit is by control voltage DRtxvcc, just energy control output voltage TAVCC; When non-selected any transmiting signal source, emission microcontroller circuit control U13 is in power down mode.Thereby useful life, the saves energy of transmitter module have been increased.
External power source inserts through C40, C32, C35, C41 filtering high-frequency interferencing signal from the J2 interface, send into 5 volts of direct voltages exporting high accuracy, high stability after the LM7805 voltage stabilizing, after C36, C42 filtering, send into transmitter module the 5th pin again, for internal circuit provides reliable power supply.
Prior art has been ignored the importance of power supply, reduces reliability of products greatly.Bring various irreparable damages to the terminal use.The present invention adopts the controlled voltage stabilizing circuit of intelligent low-power consumption and the reliability that power control circuit guarantees power supply.
Signal switching circuit comprises vision signal commutation circuit and audio signal commutation circuit, mainly form by triode Q8 to Q13, inverter U7A to U7F, signal switching circuit is by the control of emission microprocessor, the vision signal commutation circuit outputs to described radiating circuit to switching with the outside vision signal that inserts through the video video signal converted, and the audio signal commutation circuit outputs to described radiating circuit to switching with the outside audio signal that inserts from the audio signal of any computer.
Vision signal and be input to signal switching circuit by the vision signal of video conversion circuit output and after amplifying buffering, filtering, deliver to radiating circuit.And the emission microcontroller circuit is exported two groups of signal CA5, CA6 is to signal switching circuit, carry out audio signal, the control of vision signal, the vision signal control section, at the control port CA5 of central processing unit is under the situation of high level for low level CA6, RGB video signal converted VIDEOA is through terminal resistance R72 and capacitor C 8, behind the filter circuit that inductance L 3 is formed, behind triode Q9 pre-arcing road, import the VIDEO. of transmitter module because CA6 is that high level is behind a not gate U7B by diode D13, make the input end grounding of Q8 amplifying circuit, pass through diode D12 ground connection from the outer video signal Video-in of J3 input, can not be input to video transmission end VIDEO.Same reason is under the low level situation at CA5 for high level CA6, the signal VIDEOA of RGB conversion is by diode D13 ground connection, and the signal Video-in of outside input is input to the transmitting terminal VEDIO of transmitter module behind the amplifying circuit of diode D12 and Q8 composition.
The input switching of audio signal has adopted the commutation circuit identical with video circuit, its sound intermediate frequency that two sendaisles are arranged.At control signal CA5 is that the audio signal of going the same way with video signal VIDEO is sent out under the situation of high level for low level CA6.Left channel audio signal (from the J1 input) is through resistance R 78, be input to the AUDIOL end of transmitter module behind the amplifying circuit of diode D17 and Q12, right channel audio signal (from the J1 input) is through resistance R 76, be input to the AUDIOR end of transmitter module behind the amplifying circuit of diode D15 and Q11, during for high level be cut off at CA6 from the audio signal of going the same way with vision signal Video-in of J2 input this moment.
Microprocessor U1 identification is simultaneously selected the transmission channel of wireless transmission system by the action frequency of scanning key switch SW2.The most initial channel of circuit is CH1, and the user is switched the transmission channel by SW2, and each channel all has corresponding indicator light, allows the user can understand current transmitting channel.
The power-failure memory function is arranged when user's switching on and shutting down again, system's configuration information that the emission microcontroller circuit will reading of data access chip internal when the user starts shooting again, setting when resetting to system's last time shutdown, thus played the power-failure memory function.Power supply partly circuit has also played filtering, voltage stabilizing, effects such as the power distribution of each circuit, supply.Reset circuit also provides reliable reset signal for the emission microcontroller circuit, and to reduce problems such as causing no image transmission when the switching on and shutting down, the reset circuit of CPU adopts and hangs down electric recognition technology, has strengthened the entire system reliability.
Wireless transmitting system adopts 2.4G frequency range, inner compartment shield mode, the standard of closing international FCC.
Technical parameter is as follows: radio frequency transmitted frequency: Ch1-2414MHz; Ch2-2432MHz; Ch3-2450MHz; Ch4-2468MHz.Modulation system: frequency modulation
Audio signal is respectively from 3 pin of transmitter module VM_T2AS and the input of 4 pin, and vision signal is delivered to first pin input of transmitter module VM_T2AS after the J3 input.Audio signal and vision signal send into carry out behind the transmitter module A/D convert to the final stage of carrying out sending to after the filtering transmitter module after the digital signal carry out with the 2.4G frequency synthesis after send, and in the selection of sendaisle, change with SW2.Adopted microprocessor conversion in this product, when the user presses SW2, after microprocessor is eliminated shake by the method for software, the switching of the channel that carries out, SW2 switches once by channel is corresponding next time, and the channel of the current transmitter module of microprocessor stores, when starting shooting next time, still use this channel.
Fig. 4 is the receiving system circuit theory diagrams, comprises receiving microprocessor U11 (AT89C2051), receiver module VM_R2AS, power circuit, data access circuit U 10 etc.;
Receiving system adopts the identical power circuit of emitter operating voltage to be provided for described wireless audio and video receiving system, adopts fixing output three terminal regulator V5, is used to receiving circuit that the operating voltage of high stability is provided; Described fixedly output three terminal regulator circuit adopts LM7805 voltage stabilizing chip, thereby has increased useful life, the saves energy of receiving circuit.
The audio signal of dual track is imported by way of triode Q20 from receiver module 1 pin, 2 pin respectively, exports behind the amplifying circuit that Q21 forms.Vision signal is exported behind the amplifying circuit of the 10th pin output through triode Q22 composition of receiver module.
Aspect channel selection, receive the input of microprocessor U11 (AT89C2051) scanning external key SW3, the output channel switching signal allows it enter channel and exchanges function, up to receiving correct signal to receiver module after receiving microprocessor U11 (AT89C2051) analysis.The indicator light of receiving terminal can be indicated current receiving channels simultaneously, for example, is in the 3rd channel now, and indicator light LED6 can be rhythmical glittering, and three minor tick times are short, is then to extinguish one long slightly period, the circulation in cycle like this.Receiving circuit also has a storage chip, after the user mixes up emission and the channel that receives, and the channel of microprocessor stores transmitting channel and reception.Thereby the user can use the channel that oneself is provided with, and has avoided same local the use and problem that the mutual intersection brought receives.The reception radio frequency range of wireless audio and video receiving system: Ch1-2414MHz; Ch2-2432MH; Ch3-2450MHz; Ch4-2468MHz.
The present invention directly exports with PAL/NTSC owing to can convert the S-VEDIO signal of common TV function identification to SVGA, XGA, the VGA vision signal from any computer to; Can carry out wireless transmission again, and reception, to go up demonstration through the display unit (as television set, projecting apparatus etc.) of the PAL/NTSC standard of the computer video of conversion standard or the external indoor and outdoor of television video certain distance outside, can also directly record with video tape recorder; Can be widely used in business in brief demonstration, interactive training, computer teaching in classroom, the making of wedding gauze kerchief video tape, home entertaining, play games, online, information issue, video wall etc.
Claims (4)
1, a kind of wireless audio and video receive-transmit system comprises:
Radiating circuit is used for composite video signal and audio signal being modulated and launching;
Receiving circuit is used to receive the modulation signal that radiating circuit is launched, and output is reduced to corresponding composite video signal and audio signal;
Video conversion circuit, be used to receive VGA from any PC, notebook computer, digital video signal such as SVGA or XGA, convert thereof into the S-VHS vision signal and the composite video signal of NTSC or pal mode, and this composite video signal is delivered to described radiating circuit emission after amplifying buffering, filtering;
It is characterized in that: described video conversion circuit comprises input interface circuit, the video conversion chip, the composite video signal filter network, S-VHS vision signal filter network and output interface circuit, the composite video signal filter network comprises a LC filter network and a Л type filter network at least, S-VHS vision signal filter network comprises the 2nd LC filter network and the 2nd Л type filter network at least, rgb signal is the input video conversion chip behind input interface circuit, after the video conversion chip converts the rgb signal of importing to composite video signal and S-VHS vision signal, composite video signal is earlier after connect corresponding output interface circuit after a LC filter network and the Л type filter network filtering, and the S-VHS vision signal is earlier after connect corresponding output interface circuit after the 2nd LC filter network and the 2nd Л type filter network filtering.
2, wireless audio and video receive-transmit system according to claim 1, it is characterized in that: described radiating circuit comprises emission microprocessor U1, emission power circuit and transmitter module, the emission power circuit comprises controlled voltage stabilizing circuit and power control circuit, power supply connects controlled voltage stabilizing circuit after filtering, controlled voltage stabilizing circuit is output as radiating circuit required operating voltage is provided, the size of controlled voltage stabilizing circuit output voltage is controlled by power control circuit, the control signal of being sent by emission microprocessor U1 connects power control circuit, be used for when not having transmiting signal source, control controlled voltage stabilizing circuit by the emission microprocessor and be in power down mode.
3, wireless audio and video receive-transmit system according to claim 2, it is characterized in that: described controlled voltage stabilizing circuit comprises the adjustable voltage stabilizing chip of three ends, described power control circuit comprises triode, power supply connects the voltage input end of the adjustable voltage stabilizing chip of three ends after filtering, the control signal of being sent by emission microprocessor U1 connects the base stage of triode, the collection utmost point of triode connects the voltage-regulation end of the adjustable voltage stabilizing chip of described three ends, and the voltage output end of three ends are adjustable voltage stabilizing chip provides adjustable operating voltage for radiating circuit.
4, according to any described wireless audio and video receive-transmit system of claim 1-3, it is characterized in that: described radiating circuit comprises vision signal commutation circuit and audio signal commutation circuit, vision signal commutation circuit and audio signal commutation circuit are by the control of emission microprocessor, the vision signal commutation circuit outputs to described transmitter module to carrying out switching controls through the video video signal converted with the outside vision signal that inserts, and the audio signal commutation circuit outputs to described radiating circuit to carrying out switching controls from the audio signal of any computer with the outside audio signal that inserts.
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| CN 03126984 CN1256846C (en) | 2003-06-22 | 2003-06-22 | Radio video-audio transceiving system |
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| CN 03126984 CN1256846C (en) | 2003-06-22 | 2003-06-22 | Radio video-audio transceiving system |
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| CN110012241A (en) * | 2019-05-11 | 2019-07-12 | 青岛大迡网络科技有限公司 | Wireless video control and editing system |
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