CN204498260U - A kind of radio transmitter of vision signal - Google Patents
A kind of radio transmitter of vision signal Download PDFInfo
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- CN204498260U CN204498260U CN201520130857.5U CN201520130857U CN204498260U CN 204498260 U CN204498260 U CN 204498260U CN 201520130857 U CN201520130857 U CN 201520130857U CN 204498260 U CN204498260 U CN 204498260U
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Abstract
The utility model discloses a kind of radio transmitter of vision signal, and it comprises: DC power supply VCC; Be serially connected in the resistance R1 between DC power supply VCC and ground and resistance R2; Be connected to the oscillating circuit of the common port of resistance R1 and resistance R2; The base stage contact resistance R1 of transistor Q1, this transistor Q1 is connected DC power supply VCC with after the common port of resistance R2, emitter series resistor R3 ground connection, collector series connection inductance L 2 and resistance R4, and the emitter of this transistor Q1 connects the output of oscillating circuit; The electric capacity C4 in parallel with inductance L 2; Wherein one end of this inductance L 2 connects vision signal S1 waiting for transmission by coupling capacitance C5, and the other end serial connection coupling capacitance C6 of this inductance L 2 is connected with radio-frequency antenna ANT.The electronic component that the utility model circuit uses is less, circuit structure simple, realize the advantage that cost is lower and circuit body sum size is less.
Description
Technical field
The utility model relates to transmission of video circuit, especially relates to a kind of radio transmitter of vision signal.
Background technology
At present, in wireless video monitoring, wireless image sensor field, video information is obtained by video acquisition device (such as camera, imageing sensor), output digital video signal or analog video signal to computer or server, are more externally transmitted by wireless network by computer or server end.Prior art mainly relies on computer or server carries out video reception and forward process, relends and helps wireless router or other wireless network modules (such as Zigbee wireless network module) to carry out wireless transmission to vision signal.Therefore, existing video radio transmitter exist complex structure, physical size excessive, realize the large defect of cost, be unfavorable for being used in some undersized video monitoring apparatus, wireless image sensing device.
In addition, prior art also for video wireless transmission, the corresponding video circuit of development and Design.Such as, Chinese patent application CN201320560590.4 proposes a kind of video image radiating circuit, as shown in Figure 1, comprise the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8, 9th electric capacity C9, tenth electric capacity C10, first inductance L 1, second inductance L 2, first diode D1, first triode VT1, second triode VT1, second diode D2, potentiometer RP, signal loader JP, transformer T, microwave is wide puts UPC and antenna ANT.The analog voltage signal that this circuit exports camera and local oscillation signal mix out radiofrequency signal, radiofrequency signal sends through microwave amplifier with after being total to the amplification of emitting stage circuit, wire transmission can be become into wireless transmission, but, there is following technological deficiency in this technical scheme: owing to have employed the components and parts such as the larger transformer of volume size, potentiometer in circuit, the electronic devices and components One's name is legion of forming circuit, circuit structure is complicated, circuit volume and size are comparatively large, are unfavorable for being used in some undersized video monitoring apparatus, wireless image sensing device.
Utility model content
For overcoming the defect of prior art, the utility model proposes that a kind of circuit is simple, circuit small volume and realize the radio transmitter of lower-cost vision signal.
The utility model adopts following technical scheme to realize: a kind of radio transmitter of vision signal, and it comprises: DC power supply VCC; Be serially connected in the resistance R1 between DC power supply VCC and ground and resistance R2; Be connected to the oscillating circuit of the common port of resistance R1 and resistance R2; The base stage contact resistance R1 of transistor Q1, this transistor Q1 is connected DC power supply VCC with after the common port of resistance R2, emitter series resistor R3 ground connection, collector series connection inductance L 2 and resistance R4, and the emitter of this transistor Q1 connects the output of oscillating circuit; The electric capacity C4 in parallel with inductance L 2; Wherein one end of this inductance L 2 connects vision signal S1 waiting for transmission by coupling capacitance C5, and the other end serial connection coupling capacitance C6 of this inductance L 2 is connected with radio-frequency antenna ANT.
Wherein, this oscillating circuit is made up of the inductance L 1 be connected in series successively, electric capacity C1, electric capacity C2 and electric capacity C3, the wherein common end grounding of inductance L 1 and electric capacity C3, the common port contact resistance R1 of electric capacity C1 and electric capacity C2 and the common port of resistance R2, electric capacity C2 is connected the emitter of transistor Q1 with the common port of electric capacity C3.
Wherein, the resonance frequency of the LC resonant circuit of inductance L 2 and electric capacity C4 formation is equal with the resonance frequency of oscillating circuit.
Wherein, transistor Q1 is N-type pliotron.
Compared with prior art, the utility model has following beneficial effect:
1, signal tranmitting frequency of the present utility model arbitrarily regulates by the parameter of FM circuit and oscillating circuit, and vision signal can adopt any frequency to launch, wide accommodation.
2, the electronic component that uses of the utility model circuit is less, and circuit structure is simple, realizes cost lower.
3, circuit of the present utility model uses large-sized inductance negligible amounts, and replace the transformer coupled between DC power supply VCC and vision signal S1 of prior art by a resistance R4, thus without the need to using larger-size transformer, further reduce volume and the size of circuit, thus make the utility model be able to utilization in some undersized video monitoring apparatus, wireless image sensing device to provide advantage.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art;
Fig. 2 is the circuit diagram of the utility model embodiment.
Embodiment
As shown in Figure 2, the utility model proposes that a kind of circuit is simple, circuit small volume and realize the radio transmitter of lower-cost vision signal, it comprises: DC power supply VCC; The biasing circuit be connected with DC power supply VCC, this biasing circuit is made up of the resistance R1 be serially connected between DC power supply VCC and ground and resistance R2; Be connected to the oscillating circuit of the common port of resistance R1 and resistance R2, this oscillating circuit is made up of the inductance L 1 be connected in series successively, electric capacity C1, electric capacity C2 and electric capacity C3, the wherein common end grounding of inductance L 1 and electric capacity C3, the common port contact resistance R1 of electric capacity C1 and electric capacity C2 and the common port of resistance R2; Transistor Q1, the base stage contact resistance R1 of this transistor Q1 is connected DC power supply VCC with after the common port of resistance R2, emitter series resistor R3 ground connection, collector series connection inductance L 2 and resistance R4, and the emitter of this transistor Q1 connects the output (i.e. the common port of electric capacity C2 and electric capacity C3) of oscillating circuit; The electric capacity C4 in parallel with inductance L 2; Wherein one end of this inductance L 2 connects vision signal S1 waiting for transmission by coupling capacitance C5, and the other end serial connection coupling capacitance C6 of this inductance L 2 is connected with radio-frequency antenna ANT.
Wherein, transistor Q1 is N-type pliotron.
Wherein, oscillating circuit also can adopt the quartz crystal oscillator of a built-in oscillation frequency to replace, and the output of this quartz crystal oscillator connects the emitter of transistor Q1.The shortcoming of quartz crystal oscillator is that frequency is fixed non-adjustable.
Wherein, the LC resonant circuit that inductance L 2 and electric capacity C4 are formed is FM circuit, and select the resonance frequency of suitable parameter and adjustable LC resonant circuit, this resonance frequency is tranmitting frequency.
Resistance R1 and resistance R2 is to DC power supply VCC dividing potential drop, and the dividing potential drop on resistance R2 provides direct current biasing for transistor Q1.Inductance L 1 and electric capacity C1 ~ electric capacity C3 form oscillating circuit, and its high-frequency carrier signal produced exports the emitter at transistor Q1.Because the base potential of transistor Q1 only exceeds a junction voltage than emitter, therefore in base stage, the waveform of voltage is consistent with emitter, and this is high-frequency carrier signal.Vision signal S1 is coupled to the collector electrode of transistor Q1 through electric capacity C5, and due to the existence of resistance R4, this vision signal S1 can not couple directly to ground by DC power supply VCC, but the direct voltage provided with DC power supply VCC is superimposed.L2 and C4 forms FM circuit, regulate its parameter can resonance in carrier frequency (i.e. the resonance frequency of FM circuit and the resonance frequency of oscillating circuit consistent).The two ends of FM circuit are the radiofrequency signal after modulation, and radiofrequency signal is coupled to radio-frequency antenna ANT by coupling capacitance C6 and carries out wireless transmission.
To sum up, compared with prior art, the utility model has following Advantageous Effects:
1, signal tranmitting frequency of the present utility model arbitrarily regulates by the parameter of FM circuit and oscillating circuit, and vision signal can adopt any frequency to launch, wide accommodation.
2, the electronic component that uses of the utility model circuit is less, and circuit structure is simple, it is lower to realize cost.
3, circuit of the present utility model uses large-sized inductance negligible amounts, and replace the transformer coupled between DC power supply VCC and vision signal S1 of prior art by a resistance R4, thus without the need to using larger-size transformer, further reduce volume and the size of circuit, thus make the utility model be able to utilization in some undersized video monitoring apparatus, wireless image sensing device to provide advantage.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1. a radio transmitter for vision signal, is characterized in that, comprising: DC power supply VCC; Be serially connected in the resistance R1 between DC power supply VCC and ground and resistance R2; Be connected to the oscillating circuit of the common port of resistance R1 and resistance R2; The base stage contact resistance R1 of transistor Q1, this transistor Q1 is connected DC power supply VCC with after the common port of resistance R2, emitter series resistor R3 ground connection, collector series connection inductance L 2 and resistance R4, and the emitter of this transistor Q1 connects the output of oscillating circuit; The electric capacity C4 in parallel with inductance L 2; Wherein one end of this inductance L 2 connects vision signal S1 waiting for transmission by coupling capacitance C5, and the other end serial connection coupling capacitance C6 of this inductance L 2 is connected with radio-frequency antenna ANT.
2. the radio transmitter of a kind of vision signal according to claim 1, it is characterized in that, this oscillating circuit is made up of the inductance L 1 be connected in series successively, electric capacity C1, electric capacity C2 and electric capacity C3, the wherein common end grounding of inductance L 1 and electric capacity C3, the common port contact resistance R1 of electric capacity C1 and electric capacity C2 and the common port of resistance R2, electric capacity C2 is connected the emitter of transistor Q1 with the common port of electric capacity C3.
3. the radio transmitter of a kind of vision signal according to claim 1, is characterized in that, the resonance frequency of the LC resonant circuit that inductance L 2 and electric capacity C4 are formed is equal with the resonance frequency of oscillating circuit.
4. the radio transmitter of a kind of vision signal according to claim 1, it is characterized in that, transistor Q1 is N-type pliotron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520130857.5U CN204498260U (en) | 2015-03-08 | 2015-03-08 | A kind of radio transmitter of vision signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520130857.5U CN204498260U (en) | 2015-03-08 | 2015-03-08 | A kind of radio transmitter of vision signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204498260U true CN204498260U (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520130857.5U Expired - Fee Related CN204498260U (en) | 2015-03-08 | 2015-03-08 | A kind of radio transmitter of vision signal |
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| Country | Link |
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| CN (1) | CN204498260U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634514A (en) * | 2016-02-22 | 2016-06-01 | 成都聚智工业设计有限公司 | Novel wireless transmitting circuit |
-
2015
- 2015-03-08 CN CN201520130857.5U patent/CN204498260U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634514A (en) * | 2016-02-22 | 2016-06-01 | 成都聚智工业设计有限公司 | Novel wireless transmitting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 Termination date: 20160308 |