CN201571045U - Voice wireless transmission device - Google Patents
Voice wireless transmission device Download PDFInfo
- Publication number
- CN201571045U CN201571045U CN2009202734930U CN200920273493U CN201571045U CN 201571045 U CN201571045 U CN 201571045U CN 2009202734930 U CN2009202734930 U CN 2009202734930U CN 200920273493 U CN200920273493 U CN 200920273493U CN 201571045 U CN201571045 U CN 201571045U
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- Prior art keywords
- circuit
- frequency
- voice
- base
- modulator
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Abstract
The utility model relates to a voice wireless transmission device, which comprises a voice signal transmitting circuit and a voice signal receiving circuit, and is characterized in that analog signals are taken as a signal source, and a modulator is used for modulating the frequency of analog audio signals, and a frequency multiplier and a power amplifier are used for processing and achieving wireless transmission of the analog signals; the receiving circuit can use a common LM386 integrated power amplifier or a radio to directly receive, and modulation signals are coupled to a base of the modulator by a microphone M via C1; R1 is a load resistance of the microphone M, and the modulator consists of T1 , R2, R3, C2, C3, C4, C6 and L1 which form a common base capacitance three-point oscillator circuit; since the base is connected with C2 in the circuit, the base is grounded for high frequency, and a collector is grounded for audio frequency; the collector junction capacitance C2 is actually connected with the two ends of the oscillator circuit in parallel, and the frequency multiplier consists of R5, R6, C7, C8, R7, T2 and L2; and the power amplifier consists of R8, R9, T3, R10 and C11.
Description
Affiliated technical field
Native system is the field of wireless transmission of voice-transmission system, particularly voice.
Background technology
Since first transistor in 1954 comes out, huge variation has taken place in people's life style, demand side opposite or the tape information transmission mode that obtains news, information and entertainment content was replaced by the wireless messages transmission gradually in the past. and this system just is signal source with the analog signal, utilize frequency modulation, frequency multiplication and power amplification three parts to handle, launch by antenna again after reaching specification requirement collecting the analog voice signal that comes; Adopt common wireless receive mode to receive simulated audio signal, reach loudspeaker and be reduced into sound after the power amplification circuit that LM386 forms carries out power amplification, the wireless transmission that finally completes successfully simulated audio signal is amplified.
Summary of the invention
The voice transfer major part all also adopts wire transmission now.The design's purpose is in order to solve voice wire transmission cost height, to use the defective be restricted, and a kind of voice radio transmitting device that provides.
The technical scheme that its technical problem that solves the utility model adopts is: be made up of signal transmission circuit and signal receiving circuit; Adopt analog signal as signal source, utilize modulator that simulated audio signal is carried out the wireless transmission that analog signal was handled and realized to frequency modulation, frequency multiplier and power amplifier, receiving circuit can adopt general LM386 integrated power amplifying circuit or directly receive with broadcast receiver, finally realizes the wireless transmission of voice.
The beneficial effects of the utility model are, this system configuration is simple, and cost is low. be convenient to produce in a large number and come into operation. and because of the frequency of transmitting terminal emission is about 90MHZ, common FM receiver can both very clearly receive signal.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is an analog signal radiating circuit principle.
Fig. 2 is the signal receiving circuit schematic diagram of making of LM386.
Among the figure: 1, microphone M, 2, frequency modulator, 3, frequency multiplier, 4, power amplifier, 5, antenna, 6, pronunciation receiver.
Embodiment
In Fig. 1, modulation signal by microphone M (CRZ-22) through C
1Be coupled to the base stage of modulator, R
1Load resistance for microphone M.Frequency modulator is by T
1, R
2, R
3, C
2, C
3, C
4, C
6And L
1Form the common base Colpitts oscillation circuit.This circuit is because base stage is connected to C
2, be base earth to high frequency, then be grounded collector (collector electrode connects power supply through L1) to audio frequency, collector junction capacitance C
2Therefore the actual oscillation circuit two ends that are connected in parallel on, change with audio signal, and frequency of oscillation is respective change also, thereby obtain FM signal.Frequency multiplier is by R5, R6, and C7, C8, R7, T2 and L2 form.T
2Adjustable C
7To obtain the frequency multiplication frequency.Power amplifier is by R8, R9, and T3, R10 and C11 form.T
3Adjustable C
10To obtain maximum output frequency.C wherein
3, C
7, C
10All be to select 7-25 μ f for use.
Fig. 2 is a pronunciation receiver, is the minimum usage of LM386 outward element.Because pin 1 and 8 open circuits, the voltage gain of integrated amplifier is 26dB, and promptly voltage amplification factor is 20.Utilize R
wThe volume of scalable loud speaker.R and C
2Series connection constitutes correcting network and is used for carrying out phase compensation.This method is simple and practical, and therefore, the receiving unit of design just adopts this kind scheme.
Claims (4)
1. a voice radio transmitting device is made up of voice signal radiating circuit and voice signal receiving circuit; It is characterized in that: adopt analog signal as signal source, utilize modulator that simulated audio signal is carried out the wireless transmission that analog signal was handled and realized to frequency modulation, frequency multiplier and power amplifier, receiving circuit can adopt general LM386 integrated power amplifying circuit or directly receive with broadcast receiver, modulation signal by microphone M through C
1Be coupled to the base stage of modulator, R
1Be the load resistance of microphone M, modulator is by T
1, R
2, R
3, C
2, C
3, C
4, C
6And L
1Form the common base Colpitts oscillation circuit, this circuit is because base stage is connected to C
2, be base earth to high frequency, then be grounded collector to audio frequency, collector junction capacitance C
2The actual oscillation circuit two ends that are connected in parallel on, frequency multiplier are by R5, R6, and C7, C8, R7, T2 and L2 form; Power amplifier is by R8, R9, and T3, R10 and C11 form, R
wBe used to regulate the volume of loud speaker, R and C
2Series connection constitutes correcting network and carries out phase compensation.
2. voice radio transmitting device according to claim 1 is characterized in that: voice signal receiving circuit base stage is connected to electric capacity, is base earth to high frequency, then is grounded collector to audio frequency, and collector capacitance is connected in parallel on the oscillation circuit two ends.
3. voice radio transmitting device according to claim 1 is characterized in that: the voice signal receiving circuit is directly done receiving terminal with common FM receiver.
4. voice radio transmitting device according to claim 1 is characterized in that: the power amplification circuit that the voice signal receiving circuit is made of LM386.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202734930U CN201571045U (en) | 2009-11-30 | 2009-11-30 | Voice wireless transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202734930U CN201571045U (en) | 2009-11-30 | 2009-11-30 | Voice wireless transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201571045U true CN201571045U (en) | 2010-09-01 |
Family
ID=42663346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202734930U Expired - Fee Related CN201571045U (en) | 2009-11-30 | 2009-11-30 | Voice wireless transmission device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201571045U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158792A (en) * | 2011-01-18 | 2011-08-17 | 黄勇 | Frequency modulation radio microphone |
| CN102231633A (en) * | 2011-03-23 | 2011-11-02 | 刘昭利 | Wireless frequency modulation transmitter manufactured by using varactor diode |
| CN105784290A (en) * | 2016-03-10 | 2016-07-20 | 上海万寅安全环保科技有限公司 | Audio detection apparatus |
-
2009
- 2009-11-30 CN CN2009202734930U patent/CN201571045U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158792A (en) * | 2011-01-18 | 2011-08-17 | 黄勇 | Frequency modulation radio microphone |
| CN102231633A (en) * | 2011-03-23 | 2011-11-02 | 刘昭利 | Wireless frequency modulation transmitter manufactured by using varactor diode |
| CN105784290A (en) * | 2016-03-10 | 2016-07-20 | 上海万寅安全环保科技有限公司 | Audio detection apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100901 Termination date: 20101130 |