CN2290161Y - Wireless microphone - Google Patents
Wireless microphone Download PDFInfo
- Publication number
- CN2290161Y CN2290161Y CN 96247786 CN96247786U CN2290161Y CN 2290161 Y CN2290161 Y CN 2290161Y CN 96247786 CN96247786 CN 96247786 CN 96247786 U CN96247786 U CN 96247786U CN 2290161 Y CN2290161 Y CN 2290161Y
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Abstract
The utility model relates to a wireless microphone, which comprises a transmitting part and a receiving part. In the transmitting part, an amplifying unit, a frequency modulation unit, a high-frequency oscillation unit, a frequency selection amplifying unit and a high-frequency power amplifier unit are orderly connected in series. An output of the microphone is connected with an output of the amplifying unit; an output of the high-frequency power amplifier unit is connected with an input of an impedance transformer; an output of the impedance transformer is connected with a transmitting antenna. The receiving part is composed of a frequency modulation reception integrated block, and local oscillation is a phase-locked loop voltage controlled oscillation circuit. A frequency selective network is connected between a receiving antenna and the integrated block. The utility model has the advantages of few peripheral components, high reliability, good consistency, clear sound quality and stable radio frequency transmission.
Description
A kind of radio microphone relates to the circuit that is used for transducer.
Chinese patent has been announced a kind of " Microphone for karaoke " for No. 93237972.9, is made up of microphone head, microphone housing, reverberation circuit, control circuit, DC power supply and external socket.Under wired and wireless operating state, significant reverberation effect is arranged all, the reverberation degree of depth can zero to reverberation the strongest between smooth adjustment, can make common microphone when the reverberation degree of depth is zero and use, transmitting range is far away during wireless operating state, suitable literature and art is sung and home entertaining.
The purpose of this utility model provides a kind of radio microphone, and it has sound clarity, the characteristics that radio frequency transmission is stable.
The utility model adopts such technical scheme: this radio microphone is formed by transmitting and receiving two parts, the amplifying unit, frequency modulation unit, high frequency oscillation unit, frequency-selecting amplifying unit, the radio frequency power amplifier unit that it is characterized in that radiating portion are connected in series successively, transducer output connects amplifying unit output, the output of radio frequency power amplifier unit connects the impedance transformer input, and antenna is penetrated in impedance transformer output sending and receiving; Receiving unit mainly is made of the FM reception integrated package, and local oscillator is the phase-locked loop Voltage-Controlled oscillation circuit, is connected to frequency-selective network between reception antenna and described integrated package.
It is few to the utlity model has peripheral cell, reliability height, high conformity, sound clarity, the characteristics that radio frequency transmission is stable.
The concrete structure of utility model is provided by following embodiment and accompanying drawing.
The radio microphone radiating portion block diagram that Fig. 1 the utility model proposes for foundation.
The radio microphone radiating portion schematic diagram that Fig. 2 the utility model proposes for foundation.
The radio microphone receiving unit schematic diagram that Fig. 3 the utility model proposes for foundation.
Below in conjunction with drawings and Examples the radio microphone that foundation the utility model proposes is described further.
This radio microphone is formed by transmitting and receiving two parts.The radiating portion circuit block diagram is referring to Fig. 1.Wherein, amplifying unit, frequency modulation unit, high frequency oscillation unit, frequency-selecting amplifying unit, radio frequency power amplifier unit are connected in series successively.Transducer output connects amplifying unit output, and the output of radio frequency power amplifier unit connects the impedance conversion unit and the output sending and receiving of impedance conversion unit are penetrated wireless.After transducer receives sound, be converted to the signal of telecommunication and deliver to amplifying unit, after amplifying, be added to frequency modulation unit, realize frequency modulation(FM).High frequency oscillation unit produces the carrier frequency frequency, signal after frequency-selecting amplifying unit, radio frequency power amplifier unit amplify, through impedance conversion by transmitting antenna to the space radiation frequency-modulated wave.Amplifying unit, frequency modulation unit, frequency-selecting amplifying unit, radio frequency power amplifier unit preferably are made of an integrated package and a small amount of peripheral cell, and preferable corresponding integrated package model is MC2833P.High frequency oscillation unit is made of the external crystal oscillator of described integrated package (piezoelectric crystal), and receiving unit receives integrated external phase-locked loop Voltage-Controlled oscillation circuit by frequency modulation (FM) and forms.The model of FM reception integrated package is TDA2021T.Receiving unit preferably is connected to the noise elimination unit, and when antenna end did not have FM signal, the receiving unit non-output signal was realized noise elimination.
The radiating portion schematic diagram is referring to Fig. 2, and moving-coil transducer M converts the sound that receives to the signal of telecommunication, send 5 pin of IC1 through resistance R 1 and capacitor C 1, C3, and the model of IC1 is MC2833P.IC1 is a frequency modulation emission integrated package, and amplifying unit is contained in its inside, and 5 pin are its input, and 4 pin are output.3 pin of IC1 are the frequency modulation unit input, and FM signal is delivered to 13 pin by the 14 pin output of IC1 after L2, C7 frequency-selecting.
13 pin of IC1,12 pin, 11 pin are respectively base stage, the emitter and collector of its inner triode Tr2, and 7 pin, 8 pin, 9 pin are respectively emitter, base stage and the collector electrode of its inner triode Tr1.Constitute frequency selective amplifier by the Tr2 in BL1, C5 and the IC1, the signal after the amplification is coupled to 8 pin through BL1 level of transformer.Constitute the radio frequency power amplifier unit by the TP2 in L3, C12 and the IC1, the FM signal after the amplification is sent the impedance conversion unit by the output of 9 pin.10 pin of IC1 connect power supply, 6 pin, 7 pin ground connection, ground connection behind the 2 foot meridian capacitor C4.The high frequency oscillation unit that piezoelectric crystal JT, inductance L 1, capacitor C 15, C16 constitute.JT and L1 are serially connected between 1 pin and 16 pin of IC1,16 pin of IC1 and the indirect C16 of 15 pin, and 15 pin connect dc power cathode behind C15.BL2 constitutes impedance transformer, its simple capacitor C 12 that connects, and antenna is penetrated in inferior utmost point sending and receiving.
The receiving unit circuit theory diagrams are referring to Fig. 3, and IC2 is the FM reception integrated package, and model is TDA7021T.The high-frequency fm signal that sends by radiating portion after reception antenna receives, the network frequently of sending to be elected.Be connected in series with L6 and C21 again after C18, L4, C19, the L5 parallel connection and constitute frequency-selective network.Frequency-selective network output connects 12 pin of IC2.13 pin ground connection behind C26 of IC2, indirect capacitor C 22, the 16 foot meridian capacitor C32 ground connection of 10 pin and 11 pin, the direct ground connection of 3 pin, 1 foot meridian capacitor C30 connects positive source, and 2 foot meridian capacitor C29 connect positive source, and 4 pin directly connect positive source.
5 pin by piezoelectric crystal JT2, inductance L 7, capacitor C 25, resistance R 7, IC2 constitute the phase-locked loop Voltage-Controlled oscillation circuit.R7 and JT2 also connect after C25 connects 5 pin of IC2, and L7 is connected on positive source.6 pin of IC2 connect positive source behind C24.7 pin connect the positive plate of power supply behind C23, C20 is connected between 8 pin and 7 pin.14 pin of IC2 are audio output.Ground connection behind capacitor C 27, resistance R 9, R8, R8 and R9 contact are the input jack that output can connect sound equipment.Ground connection behind the 15 foot meridian capacitor C28.
9 pin of transistor BG2, R10, C31, C33 formation noise elimination unit .IC2 connect the base stage of BG2, C33, R10 and after be connected between the base stage and ground of BG2, C31 is connected between the base stage and collector electrode of BG2, and the collector electrode of BG2 connects 2 pin of IC2, and emitter connects power cathode.When antenna end did not have FM signal, the 9 pin high level of IC2 made the BG2 conducting, and 2 pin of IC2 are connected with ground, the output of 14 pin no signals; As FM signal constantly 9 pin of IC2 be low level, BG2 ends, IC2 closed loop work, thereby realize the noise elimination function.
Claims (4)
1. radio microphone, form by transmitting and receiving two parts, the amplifying unit, frequency modulation unit, high frequency oscillation unit, frequency-selecting amplifying unit, the radio frequency power amplifier unit that it is characterized in that radiating portion are connected in series each other successively, transducer output connects amplifying unit output, the output of radio frequency power amplifier unit connects the impedance transformer input, and antenna is penetrated in impedance transformer output sending and receiving; Receiving unit is made of the FM reception integrated package, and local oscillator is the phase-locked loop Voltage-Controlled oscillation circuit, is connected to frequency-selective network between reception antenna and described integrated package.
2. radio microphone according to claim 1 is characterized in that receiving unit is connected to the noise elimination unit.
3. radio microphone according to claim 1 is characterized in that the radiating portion core parts are the MC2833P integrated package.
4. radio microphone according to claim 1, the FM reception integrated package that it is characterized in that receiving unit is the TDA7021T integrated package.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96247786 CN2290161Y (en) | 1996-12-16 | 1996-12-16 | Wireless microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96247786 CN2290161Y (en) | 1996-12-16 | 1996-12-16 | Wireless microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2290161Y true CN2290161Y (en) | 1998-09-02 |
Family
ID=33919832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96247786 Expired - Fee Related CN2290161Y (en) | 1996-12-16 | 1996-12-16 | Wireless microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2290161Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361399C (en) * | 2005-02-04 | 2008-01-09 | 宁波日兴电子有限公司 | FM wireless transmission outdoor sound equipment system |
-
1996
- 1996-12-16 CN CN 96247786 patent/CN2290161Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361399C (en) * | 2005-02-04 | 2008-01-09 | 宁波日兴电子有限公司 | FM wireless transmission outdoor sound equipment system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |