CN205726076U - A kind of video reception circuit of wireless video eyeglass - Google Patents
A kind of video reception circuit of wireless video eyeglass Download PDFInfo
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- CN205726076U CN205726076U CN201620650245.3U CN201620650245U CN205726076U CN 205726076 U CN205726076 U CN 205726076U CN 201620650245 U CN201620650245 U CN 201620650245U CN 205726076 U CN205726076 U CN 205726076U
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Abstract
The utility model discloses the video reception circuit of a kind of wireless video eyeglass, including omnidirectional antenna, directional aerial, antenna change-over switch, RF receiving circuit, local oscillation circuit, intermediate frequency filtering amplifying circuit, demodulator circuit, video signal output circuit and microcontroller, video signal output circuit connects the output of demodulator circuit, omnidirectional antenna connects the first input end of antenna change-over switch, and directional aerial connects the second input of antenna change-over switch；The output termination RF receiving circuit of antenna change-over switch, the control signal output of control termination microcontroller.The utility model audio-video signal quality of reception is high, range of receiving adaptability is good, it is ensured that receive stable image in all cases.
Description
[technical field]
The utility model relates to wireless video eyeglass, particularly relates to the video reception circuit of a kind of wireless video eyeglass.
[background technology]
Antenna has different radiation or receiving ability to space different directions, here it is the directionality of antenna.According to side
The difference of tropism, antenna has omnidirectional and orientation two kinds.
Omnidirectional antenna, shows as 360 ° of all homogeneous radiations i.e. in the horizontal direction on figure, namely usually described is directionless
Property.Generally lobe width is less, and gain is bigger.
Directional aerial, shows as certain angle range of radiation in the horizontal direction on figure, namely usually described has direction
Property.The same with omnidirectional antenna, lobe width is less, and gain is bigger.
Traditional wireless video eyeglass uses single antenna, and during aircraft flight deviation desired trajectory, directional aerial cannot obtain
The quality of reception of good audio-video signal；On the contrary, when aircraft is away from receiver, omnidirectional antenna is difficult to obtain good
The quality of reception of audio-video signal.
[content of the invention]
The technical problems to be solved in the utility model is to provide a kind of audio-video signal quality of reception height, range of receiving adapts to
Property the video reception circuit of wireless video eyeglass.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is, regarding of a kind of wireless video eyeglass
Frequency receives circuit, including omnidirectional antenna, directional aerial, antenna change-over switch, RF receiving circuit, local oscillation circuit, intermediate frequency filtering
Amplifying circuit, demodulator circuit, video signal output circuit and microcontroller, video signal output circuit connects the output of demodulator circuit
End, omnidirectional antenna connects the first input end of antenna change-over switch, and directional aerial connects the second input of antenna change-over switch；Antenna
The output termination RF receiving circuit of switching switch, the control signal output of control termination microcontroller.
Above-described video reception circuit, including channel button, the output termination microcontroller of channel button
First control signal input of device.
Above-described video reception circuit, including video signal quality testing circuit, video signal quality testing circuit
Input termination video signal output circuit, output termination microcontroller the second control signal input.
Above-described video reception circuit, including RSSI testing circuit, the input termination intermediate frequency filter of RSSI testing circuit
Ripple amplifying circuit, output termination the 3rd control signal input.
Above-described video reception circuit, described video reception circuit, intermediate frequency filtering amplifying circuit includes that intermediate frequency is put
Big circuit, intermediate frequency filtering circuit and pre-amplification circuit, the input termination intermediate frequency filtering circuit of RSSI testing circuit.
The audio-video signal quality of reception of the utility model video reception circuit is high, range of receiving adaptability is good, it is ensured that
Stable image is received in the case of various.
[brief description]
With detailed description of the invention, the utility model is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the theory diagram of the video reception circuit of the utility model embodiment wireless video eyeglass.
[detailed description of the invention]
The video reception circuit of the utility model embodiment wireless video eyeglass is as it is shown in figure 1, include omnidirectional antenna, orientation
Antenna, antenna change-over switch, RF receiving circuit, local oscillation circuit, intermediate frequency filtering amplifying circuit, demodulator circuit, vision signal are defeated
Going out circuit, channel button, video signal quality testing circuit, RSSI testing circuit and microcontroller, vision signal exports
Circuit connects the output of demodulator circuit, and omnidirectional antenna connects the first input end of antenna change-over switch, and directional aerial connects antenna switching
Second input of switch；The output termination RF receiving circuit of antenna change-over switch, the control letter of control termination microcontroller
Number output.
First control signal input of the output termination microcontroller of channel button；Video signal quality detection electricity
The input termination video signal output circuit on road, the second control signal input of output termination microcontroller；RSSI detects electricity
The input termination intermediate frequency filtering amplifying circuit on road, output termination the 3rd control signal input.
Wherein, intermediate frequency filtering amplifying circuit includes IF amplifier circuit, intermediate frequency filtering circuit and pre-amplification circuit, RSSI
The input termination intermediate frequency filtering circuit of testing circuit, from the sampling of intermediate frequency filter circuit.
The operation principle of the video reception circuit of the utility model embodiment wireless video eyeglass is as shown in Figure 1:
1) radio-frequency front-end LAN part:
Directional aerial ANT1 receives the radiofrequency signal from emitter TX, it is ensured that can reach biography farther out in a predetermined direction
Defeated distance；
Omnidirectional receives the radiofrequency signal from emitter TX to antenna ANT, it is ensured that can receive aircraft in certain distance
Image in the transmission of all directions；
RF switch switching is by switching current work antenna, and Micro-processor MCV ensures in two antennas, in work at present
The image quality that antenna receives is quickly switched into, in the case of deteriorating and be less than expected image quality, the antenna having received.
RF receiving circuit includes that 5.8GHz wave filter, the first height are put, automatic gain control circuit and the second height are put:
Radiofrequency signal outside 5.8GHz filter attenuation 5.8GHz frequency range, allows inband signaling pass through；
It is low-noise amplifier that first height puts LNA, and the small-signal receiving antenna is amplified；
AGC is automatic gain control circuit, when receipt signal is very strong to input (when transmitter distance receiver is close)
Signal is decayed, and reduces the gain of second level LNA, prevents LNA saturated；
It is low-noise amplifier that second height puts LNA, is amplified front end signal, increases LNA gain；
2) local oscillation circuit includes VCO, crystal oscillator and phase-locked loop circuit:
VCO: voltage controlled oscillator, produces 5.2GHz frequency range local oscillator (LO) frequency signal；
Phaselocked loop (PLL): stablize and lock carrier frequency；
8MHZ crystal oscillator: reference signal source；
Frequency mixer: the RF signal of the second level is mixed with local oscillator, produces 480MHz intermediate-freuqncy signal；
3) intermediate-frequency channel:
Put in first: amplify the intermediate-freuqncy signal after mixing；
Intermediate-frequency filter (480MHZ), channel selection, decline outside frequency band part, takes out this intermediate frequency, filters other signals；
Intermediate-frequency preamplifier: the decay of compensation sound intermediate frequency surface wave filter；
4) demodulator circuit:
Video demodulator: complete FM demodulation, take out vision signal+audio carrier signal, i.e. baseband signal；
6.0&6.5MHz trap circuit: leach audio carrier signal, prevents sound interference image；
Video amplifier: vision signal is amplified to the 1Vp-p of standard；
Video clamp and output: waveform full line, recover the DC component in vision signal；
6.0&6.5MHz filter circuit: take out the modulated sound carrier signal in baseband signal, leach vision signal, prevent
Video interference sound；
Sound demodulation: demodulate modulated 6.0&6.5MHz FM signal, takes out voice signal；
L-Audio amplifies output: L channel is amplified to 1Vp-p output；
R-Audio amplifies output: R channel is amplified to 1Vp-p output.
The RF signal receiving from antenna, through 2..4GHz bandwidth-limited circuit, takes out 5.725GHz-5.875GHz
Band signal, after attenuation band external signal, delivers to the first height and puts LNA (low-noise amplifier),
It is re-fed into the second height to put LNA and be amplified, to ensure enough signal gains；Put the RF letter of LNA through the second height
Number, send into frequency mixer and be mixed with local oscillation signal, produce the intermediate-freuqncy signal of 480MHZ；Intermediate-freuqncy signal is after intermediate frequency amplifier amplification
Being sent to intermediate frequency SAW filter, taking out this channel signals, attenuation band is outer and other signals of adjacent frequency；Filtered intermediate-freuqncy signal is sent
Enter in being amplified to compensate for preamplifier；Frequently the demodulation of FM broadband demodulator is sent into after the insertion loss of wave filter.
Being produced 5.2GHz frequency band signals by VCO (voltage controlled oscillator), the channel frequency being completed by MCU is arranged and control data
Signal delivers to phase-locked loop pll, by the locking of phase-locked loop pll completing channel frequency；
This product F M demodulator demodulation mode is FM PLL demodulation mode, takes out from modulated 480MHZ intermediate-freuqncy signal
Baseband signal is i.e.: vision signal+sound accompaniment modulated signal；
In video channel, vision signal is through 6.0&6.5MHz trap circuit: leach audio carrier signal, prevents sound from doing
Disturb image, after taking out vision signal, send into the 1Vp-p that video amplifier circuit is amplified to standard,
Rear feeding video clamp circuit carries out shaping and recovers output after DC level.
Modulated 6.0&6.5MHz FM signal in voice-grade channel is through 6.0&6.5MHz filter circuit: take out baseband signal
In modulated sound carrier signal, leach vision signal, prevent from sending into after video interference sound
FM audio demodulator demodulates, and demodulator completes the demodulation of two road signals simultaneously, then is amplified to through audio-frequency amplifier
The 1Vp-p output of standard.
5) channel button: user is wanted the local oscillator that the frequency setting is received by SPI mode control.
6) RSSI (received signal strength indicator) testing circuit: the signal that antenna receives, amplifies and this through two grades high
The 480MHZ intermediate-freuqncy signal that mixing of shaking produces filters out of band signal through SAW filter, is then passed through IF amplifier circuit and arrives
RSSI (received signal strength indicator) detector detects, and exports the DC voltage corresponding with signal strength signal intensity, and signal is stronger, RSSI
Pin output voltage is higher；Signal is more weak, and the voltage of RSSI pin output is lower；This voltage is as judging that two reception antennas receive letter
The standard of number intensity；Give MCU as control signal.
7) video signal quality testing circuit: utilize Sync Separator Chip to isolate synchronous head, vision signal is weak to necessarily
Degree, the synchronous head of separation has loss, and synchronous head number can reduce.MCU is individual relative to what benchmark number was lost according to synchronous head
Number judges to receive picture quality.
8) microcontroller completes FREQUENCY CONTROL and channel selection:
A: receipt signal quality according to double antenna and current video picture quality and when real update work antenna, work as picture
When quality is in setting expection, current antenna is not made to switch；
B: current antenna receives image quality less than when setting expection image quality, switches current antenna；
C: when dual-antenna reception image quality is below and sets expected picture, when real update current antenna, make to work as the day before yesterday
It is work antenna that line is in best reception antenna in the case of less than expected picture.
The utility model above example overcomes the direction defect of single antenna, it is ensured that receive stable image, expands
Antenna receiving angle, thus ensure at FPV in-flight, aircraft flight deviation desired trajectory and distant when, Dou Nengshi
When select antenna optimization to receive image effect, it is ensured that picture quality is for can receive picture quality.
Claims (5)
1. a video reception circuit for wireless video eyeglass, including antenna, RF receiving circuit, local oscillation circuit, intermediate frequency filtering
Amplifying circuit, demodulator circuit, video signal output circuit and microcontroller, the output termination RF receiving circuit of antenna, video
Signal output apparatus connects the output of demodulator circuit, it is characterised in that include antenna change-over switch, and described antenna includes omnidirectional
Antenna and directional aerial, omnidirectional antenna connects the first input end of antenna change-over switch, and directional aerial connects the of antenna change-over switch
Two inputs；The output termination RF receiving circuit of antenna change-over switch, the control signal output of control termination microcontroller.
2. video reception circuit according to claim 1, it is characterised in that including channel button, channel selection is opened
First control signal input of the output termination microcontroller closing.
3. video reception circuit according to claim 1, it is characterised in that include video signal quality testing circuit, depending on
Frequently the input termination video signal output circuit of signal quality testing circuit, the second control signal of output termination microcontroller is defeated
Enter end.
4. video reception circuit according to claim 1, it is characterised in that include RSSI testing circuit, RSSI detects electricity
The input termination intermediate frequency filtering amplifying circuit on road, output termination the 3rd control signal input.
5. video reception circuit according to claim 4, it is characterised in that intermediate frequency filtering amplifying circuit includes that intermediate frequency amplifies
Circuit, intermediate frequency filtering circuit and pre-amplification circuit, the input termination intermediate frequency filtering circuit of RSSI testing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620650245.3U CN205726076U (en) | 2016-06-27 | 2016-06-27 | A kind of video reception circuit of wireless video eyeglass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620650245.3U CN205726076U (en) | 2016-06-27 | 2016-06-27 | A kind of video reception circuit of wireless video eyeglass |
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| Publication Number | Publication Date |
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| CN205726076U true CN205726076U (en) | 2016-11-23 |
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| CN201620650245.3U Active CN205726076U (en) | 2016-06-27 | 2016-06-27 | A kind of video reception circuit of wireless video eyeglass |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960557A (en) * | 2017-02-22 | 2017-07-18 | 华南农业大学 | A kind of multiple antennas automatic switching control equipment and method based on RSSI |
-
2016
- 2016-06-27 CN CN201620650245.3U patent/CN205726076U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960557A (en) * | 2017-02-22 | 2017-07-18 | 华南农业大学 | A kind of multiple antennas automatic switching control equipment and method based on RSSI |
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