CN201733291U - Wireless frequency modulation transmitter - Google Patents
Wireless frequency modulation transmitter Download PDFInfo
- Publication number
- CN201733291U CN201733291U CN2010202347061U CN201020234706U CN201733291U CN 201733291 U CN201733291 U CN 201733291U CN 2010202347061 U CN2010202347061 U CN 2010202347061U CN 201020234706 U CN201020234706 U CN 201020234706U CN 201733291 U CN201733291 U CN 201733291U
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- frequency modulation
- module
- frequency
- audio
- audio interface
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Abstract
The utility model provides a wireless frequency modulation transmitter, which comprises an audio interface module, a stereo sound adjusting module, a frequency modulation transmitting module and a frequency modulation amplifying module. The audio interface module, the stereo sound adjusting module, the frequency modulation transmitting module and the frequency modulation amplifying module are connected in sequence, input digital audio signals are received by the audio interface module and are modulated into stereo sound analog audio frequency, the stereo sound analog audio frequency is converted by the frequency modulation transmitting module wirelessly, and finally frequency modulation audio signals are output by the frequency modulation amplifying module.
Description
Technical field
The utility model relates to a kind of electronic equipment, especially a kind of wireless frequency modulation reflector.
Background technology
A lot of musical instrumentses all are to be connected with sound equipment by tone frequency channel wire, are not under many circumstances easily to carry out cable to connect, and also are not easy to carry, and equipment also is not easy to move.
Summary of the invention
The shortcoming of for a change above-mentioned traditional music equipment, the utility model provide a kind of wireless frequency modulation reflector.
The utility model comprises audio interface module, stereo adjusting module, frequency modulation transmitter module, the frequency modulation amplification module, it is characterized in that, audio interface module, stereo adjusting module, frequency modulation transmitter module, the frequency modulation amplification module connects successively, receives the input of digital audio and video signals by the audio interface module, be adjusted into stereo analogue audio frequency after, carry out wireless conversion by the frequency modulation transmitter module, and through frequency modulation amplification module output frequency modulated audio signal.
The beneficial effects of the utility model are, the wireless frequency modulation reflector can insert musical instruments at any time, and launches by wireless frequency modulation, as long as just there is the FM reception system can play out music, and equipment is easy to carry about with one, and has better flexibility and portability.
Description of drawings:
Fig. 1 is a schematic diagram of the present utility model, and Fig. 2 is the utility model electricity structure chart.
Embodiment:
As shown in Figure 1, the utility model comprises audio interface module 1, stereo adjusting module 2, frequency modulation transmitter module 3, frequency modulation amplification module 4, audio interface module 1, stereo adjusting module 2, frequency modulation transmitter module 3, frequency modulation amplification module 4 connects successively, receives the input of digital audio and video signals by audio interface module 1, be adjusted into stereo analogue audio frequency after, carry out wireless conversion by frequency modulation transmitter module 3, and through frequency modulation amplification module 4 output frequency modulated audio signals.
As shown in Figure 2, audio signal by the input of 1 pin, 22 pin after, cooperate by delivering in the blender behind preemphasis circuit, amplitude limiter circuit and the low pass filter by 21,20,19,2,3,4 pin and the external circuit of BH1417.By the oscillating circuit of the access 7.6MHz crystal oscillator of 13 pin, 14 pin input, produce the subcarrier signal of 38kHz by 200 frequency divisions.The 38kHz subcarrier is by producing the pilot signal of 19kHz behind 2 frequency divisions, L channel deducts the signal of R channel and the subcarrier of 38kHz carries out the balance modulation, and the composite signal after the modulation is by the output of 5 pin.Modulating emission circuit adopts the phase-locked loop systems of frequency stabilization.After the decoding of frequency codes process and phase demodulation of 15,16,17, the 18 pin input of BH1417, by the control signal VCO of 7 pin output LC oscillator.The high-frequency oscillating circuits that this VCO control external discrete element is formed produces the carrier signal of FM frequency modulation, and by 2 triode C9018 the composite stereo acoustical signal of 5 pin output is carried out the FM frequency modulation(FM).Signal after the modulation is input to BH1417 by 9 pin, and the radiofrequency signal after amplifying through inner radio frequency amplifier is exported by 11 pin.Signal after the output can directly be received 5,7,9,10,12 pins of launching BH1417 on the transmitting antenna and cooperate connected discrete component, constitutes the hunting of frequency and the rf modulations part of frequency modulated carrier; 13,14 pin need the crystal oscillator of external 7.6MHz, offer the needed stabilizing clocks of part such as phase demodulation, stereophonic signal modulation of BH1417 inside; 6,8 is power unit; 11 pin constitute the FM signal radiating portion with the outside element that is connected.After the 11 pin signals output of BH1417, adopt 9018 to come one-level to amplify the wireless output of back frequency modulation.
Claims (1)
1. wireless frequency modulation reflector, audio interface module (1), stereo adjusting module (2), frequency modulation transmitter module (3), frequency modulation amplification module (4), it is characterized in that, audio interface module (1), stereo adjusting module (2), frequency modulation transmitter module (3), frequency modulation amplification module (4) connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202347061U CN201733291U (en) | 2010-06-23 | 2010-06-23 | Wireless frequency modulation transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202347061U CN201733291U (en) | 2010-06-23 | 2010-06-23 | Wireless frequency modulation transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733291U true CN201733291U (en) | 2011-02-02 |
Family
ID=43524446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202347061U Expired - Fee Related CN201733291U (en) | 2010-06-23 | 2010-06-23 | Wireless frequency modulation transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201733291U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110897636A (en) * | 2019-12-31 | 2020-03-24 | 成都飞云科技有限公司 | Electrocardiosignal acquisition circuit, module, equipment, system and clothing |
-
2010
- 2010-06-23 CN CN2010202347061U patent/CN201733291U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110897636A (en) * | 2019-12-31 | 2020-03-24 | 成都飞云科技有限公司 | Electrocardiosignal acquisition circuit, module, equipment, system and clothing |
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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: 20110202 Termination date: 20110623 |