CN2406432Y

CN2406432Y - Multifunction wireless microphone and earphone device

Info

Publication number: CN2406432Y
Application number: CN 99245144
Authority: CN
Inventors: 艾晓峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-18
Filing date: 1999-10-18
Publication date: 2000-11-15
Anticipated expiration: 2009-10-18

Abstract

The utility model relates to a multifunctional wireless microphone and earphone device used as a wireless earphone in a wireless microphone, a learning-aid device, an FM radio and a sonic appliance. The utility model is composed of an emitter, a receiver, conversion plugs and audio cable wires, wherein, the emitter is connected in series with a microphone, a signal amplification circuit of a microphone, a pre-emphasis circuit and a conversion switch, conversion switches are arranged between a receiving demodulation circuit and an audio amplification circuit and between a power supply and the audio amplification circuit in the manner of series connection, and the receiving demodulation circuit and the audio amplification circuit are arranged in the receiver. The utility model has the advantages of small body, light weight, simple structure, convenient operation, low cost, and power consumption saving.

Description

Multifunction wireless microphone and Headphone device

The utility model relates to a kind of radio communication technology, especially relates to a kind of multifunction wireless microphone and Headphone device that can be used as the wireless headset in wireless microphone, learning-aid device, FM receiver and the stereo set.

In existing technology, Chinese patent ZL97247790.X provides a kind of wireless microphone and earphone unification device, and this technology only with a cover modulation demodulation system, has realized two kinds of functions of wireless microphone and wireless headset, has saved manufacturing cost.But its reflector non-transformer automatic switch and auto-conversion function, the stereo set output signal needs the potentiometer adjusting that decays, so operation is not too convenient, tonequality is also relatively poor during as wireless microphone, and adopted stereo decoding circuit and stereo power amplifier in its receiver, and output needs two sockets, so cost is higher, power consumption is bigger, and operation is convenient inadequately.

The purpose of this utility model is to overcome above-mentioned defective, provide a kind of simple in structure, cost is low, the multifunction wireless microphone and the Headphone device of power consumptive province, easy and simple to handle, function admirable.

The technical solution of the utility model is as follows: it is made up of reflector, receiver, changeover plug, audio-frequency electric cable.Reflector is formed by attenuator circuit, modulation circuit, radio frequency amplifying circuit serial connection, on modulation circuit, radio frequency amplifying circuit, also connect microphone and microphone signal amplifying circuit, preemphasis circuit, serial conversion switch between the power supply of the power supply of modulation circuit and radio frequency amplifying circuit and microphone signal amplifying circuit.Receiver is in series by High Amplifier Circuit, receiving demodulation circuit, audio amplifier circuit, is reaching serial conversion switch between power supply and the audio amplifier circuit between receiving demodulation circuit and the audio amplifier circuit.

The utility model has the advantages that fuselage is little, in light weight, simple in structure, easy and simple to handle, cost is low, the power consumptive province.

Fig. 1 is the transmitter circuit block diagram.

Fig. 2 is the acceptor circuit block diagram.

Fig. 3 is the transmitter circuit schematic diagram

Fig. 4 is the acceptor circuit schematic diagram.

Fig. 5 is the cable pictorial diagram.

Fig. 6 is a reflector printed board ground wire wiring diagram.

The utility model is made up of reflector, receiver, changeover plug, audio-frequency electric cable, wherein:

As shown in Figure 1, reflector is formed by attenuator circuit, modulation circuit, radio frequency amplifying circuit serial connection; The preemphasis circuit of connecting on attenuator circuit also is in series with two microphones and two microphone signal amplifying circuits, tone color adjustment and preemphasis circuits on modulation circuit, radio frequency amplifying circuit; Automatic switch in parallel on power supply hand switch K1, automatic change-over CZ1 connects between the power supply of modulation and the power supply of radio frequency amplifying circuit and microphone signal amplifying circuit.As shown in Figure 3, preemphasis circuit is by C6, R6 forms and C8, R7 forms, preemphasis and attenuator circuit are by C8, R7, R8, R9, K4 forms, K4 is the attenuation by-pass cock, C7 is a shunt capacitance, be connected in parallel on the CZ1 two ends, R10 is an isolation resistance, be connected between attenuator circuit and the coupling capacitance C9 R11, D1 forms voltage stabilizing circuit, the indication of D1 double as power supply, modulation circuit is by triode T3, coil L1, C10, C12, C13, R12, R13, R14 constitutes, radio frequency amplifying circuit is by triode T4, coil L2, C14, C15, C17, R15 forms, L3, L4 is the high frequency retardation coil, C5, C11, C16 strobes, B1 is an Electret condenser microphone, R1 provides operating current for B1, and the microphone signal amplifying circuit is by C1, C2, R2, R3, T1 forms, and B2 is a moving-coil microphone, by C3, C4, R4, R5, T2 constitutes the moving-coil microphone signal amplification circuit, W1 is that tone color is adjusted potentiometer, C18, C19, D2, D3 constitutes voltage doubling rectifing circuit, R16, R17, T5, T6 constitutes electronic switching circuit.

As shown in Figure 2, receiver is in series by High Amplifier Circuit, receiving demodulation circuit, audio amplifier circuit, is reaching serial conversion switch between power supply and the audio amplifier circuit between receiving demodulation circuit and the audio amplifier circuit; High Amplifier Circuit is made up of R1, R2, C1, C2, T1, receiving demodulation circuit is made of IC1 (TDA7088T), R3, R4, R5, C3-C15, C17, D1, L1, L2, audio amplifier circuit is by T2, W2, L3, C18-C22, R6, R7 group, K2 is a mains switch, K3 is a change over switch, D2 is the power supply indication, and R8 is a current-limiting resistance, and C16, C23 strobe.

Changeover plug is connected with diameter 6.5mm monophony plug by the R sound channel in the diameter 3.5mm stereo plug and is constituted.

The audio-frequency electric cable, its structure as shown in Figure 5,1 and 3 is the stereo plug of diameter 3.5mm among the figure, and 2 is RCA connector, it be by the R sound channel in the stereo plug 1 by shielding conductor connect with RCA connector 2, RCA connector 2 constitutes with two sound channels in the stereo plug 3 are in parallel by shielding conductor.

The reflector ground wire is arranged to annular as shown in Figure 6 ground wire, and extended distance is 0.5cm, and locates weld one 10 μ electrochemical capacitors M, N at 2 and make it form ac circuit, and then transmitter noise can be reduced to very little.

When the utility model during as wireless headset, at first cable 1 end is inserted the input socket CZ1 of double as automatic change-over, cable 2 ends are inserted the stereo set audio signal output end or 3 ends are inserted the television field frame output, C18 during signal one tunnel passes through then, D2, D3, the voltage doubling rectifing circuit that C19 forms, produce the direct voltage that equals the input signal twice at the C19 two ends, this direct voltage offers by R16, R17, T5, the electronic switch that T6 forms, at first make T6 produce the base stage bias current and make the T6 conducting by R16, make its saturated (being equivalent to switch closure) for T5 provides the bias current loop, reflector enters operating state.Another road of signal is through being connected in parallel on the C7 filter away high frequency noise at socket two ends, enter the preemphasis circuit of C8, R7 composition and the attenuator circuit of forming jointly by C8 and R7, R8, R9, K4, K4 is the attenuation by-pass cock, then K4 closes when incoming signal level is high, otherwise then disconnect, for modulation circuit provides suitable modulation voltage, the ratio of R8, R9 resistance is 2: 1.5; Through the audio signal of overdamping by isolation resistance R10 (prevent high-frequency signal from being shunted) by audio signal to coupling capacitance C9, enter by triode T3, (L1 is that printed inductance is in printed board to coil L1, prevent that mechanical oscillation and the coil that causes owing to variations in temperature from expanding with heat and contract with cold, inductance value is changed and the occurrence frequency skew), capacitor C 10, C12, C13, resistance R 12, R13, the modulation circuit that R14 constitutes, change C12 and can change modulating frequency, high brightness diode D1 both formed voltage stabilizing circuit with R11, the double simultaneously power supply of doing is indicated, it makes its frequency more stable for the T3 base stage provides stable voltage, modulation signal adds to by triode T4 by coupling capacitance C14, coil L2 and resistance R 15, the radio frequency amplifying circuit that capacitor C 15 constitutes, the signal after the amplification is coupled to a day alignment spatial emission through capacitor C 17; C5, C11, the C16 L4 that strobes, L3 is the high frequency retardation coil, this moment, earphone is inserted socket CZ2, the change over switch K3 of receiver pulled out to the top A is linked to each other with a, A ｀ links to each other with a ｀, again with mains switch K2 closure, it is energized, after being received by the radiofrequency signal of reflector emission, pass through as shown in Figure 4 by C1, C2, R1, R2, after the High Amplifier Circuit that T1 forms amplifies, entering IC1 pin 11 is exported by IC1 pin 2 behind the IC1 frequency discrimination, audio signal after the output is through coupling capacitance C18, potentiometer W2, coupling capacitance C19, enter by triode T2, high frequency retardation coil L3, capacitor C 20, C21, C22, resistance R 6, the audio amplifier circuit that R7 constitutes inputs to earphone again; Change W2 scalable volume, S1 is a reset key, and S2 is a search key, clicks the i.e. up search of S2, and finding promptly stops search behind the radio station makes its frequency lock by internal circuit, clicks continuation again and up searches for, and clicks the S1 reset key and promptly gets back to frequency least significant end.High brightness LED D2 does power supply indication usefulness, and R8 current-limiting resistance, C16, C23 are filter capacitor.TX one is about 10cm multiply flexible conductor and is loaded in the receiver casing, reception antenna during as the wireless microphone receiver.

When this reality is done novel during as wireless microphone, with the K1 closure, extracting the audio-frequency electric cable then from CZ1, CZ1 converts the wireless microphone working method automatically to, at this moment the C of automatic change-over CZ1,2 connections of D, B1, B2 microphone signal amplifying circuit gets electric work (as shown in Figure 3), modulation and radio frequency amplifying circuit answer the K1 closure also to work, and B1 is an Electret condenser microphone, and R1 provides operating current for B1, capacitor C 1, C2, resistance R 2, R3, T1 forms the microphone signal amplifying circuit, and is coupled to W1, and B2 is a moving-coil microphone, capacitor C 3, C4, resistance R 4, R5 constitutes moving-coil microphone speech amplifying circuit, and also couples a signal to W1 and mix, and is exported by the W1G point; The relatively heavy forceful deepness of moving-coil microphone tone color, and that the Electret condenser microphone tone color is partial to is peace and quiet transparent, is equivalent to bass and high pitch loudspeaker in the audio amplifier.So this microphone has division function, during making Electret condenser microphone is fixed on the moving coil type microphone heart; Regulate W1 and can adjust tone color.The sound that the people speaks or sings is by microphone B1, B2 pick up and through the microphone signal amplifying circuit after potentiometer W1 mix, export R6 to by the G point, the preemphasis circuit that C6 forms, add to modulation and radio frequency amplifying circuit by preemphasis circuit through coupling capacitance C9, and outwards launch by antenna, at this moment, to setting aside A is linked to each other with b receiver change over switch K3, A ｀ links to each other with b ｀, 3.5 1 of the diameters of changeover plug are inserted CZ2, stereo set microphone input is inserted in the other end of diameter 6.5mm, and, can realize radio microphone function with the K2 closure, because of this microphone has division function, and can carry out the tone color adjustment, so tonequality is better.

If use separately receiver, change over switch K3 is pulled out to the upper end, A is linked to each other with a, A ｀ links to each other with a ｀, and earphone is inserted CZ2, and with the K2 closure, but listening in frequency modulation broadcast then.

If change earphone into changeover plug, be inserted into microphone 2 stereo set inputs, then can become the radio reception head of stereo set.

If reflector is in wireless microphone operating state (promptly not epenthesis frequently cable) with the K1 closure, and receiver is in wireless headset receives operating state (be about to A links to each other with a, A ' links to each other with a ') earphone is inserted CI2, the K2 closure, oneself is facing to the reflector speech, then can realize the function of learning-aid device from saying, listening certainly.

Claims

1. a multifunction wireless microphone and Headphone device that constitutes by reflector, receiver, it is characterized in that: it also is made up of changeover plug, audio-frequency electric cable, reflector is formed by attenuator circuit, modulation circuit, radio frequency amplifying circuit serial connection, at modulation circuit, also connect on the radio frequency amplifying circuit microphone and microphone signal amplifying circuit, preemphasis circuit; Serial conversion switch between the power supply of modulation and the power supply of radio frequency amplifying circuit and microphone signal amplifying circuit; Receiver is in series by High Amplifier Circuit, receiving demodulation circuit, audio amplifier circuit, is reaching serial conversion switch between power supply and the audio amplifier circuit between receiving demodulation circuit and the audio amplifier circuit.

2. multifunction wireless microphone according to claim 1 and Headphone device, it is characterized in that: on modulation circuit, radio frequency amplifying circuit, be in series with Electret condenser microphone and moving coil type microphone and two microphone signal amplifying circuits, and the series connection tone color is adjusted circuit on preemphasis circuit.

3. multifunction wireless microphone according to claim 2 and Headphone device, it is characterized in that: automatic switch in parallel on power supply hand switch K1, form voltage doubling rectifing circuit by C18, D2, D3, C19, electronic switch by R16, R17, T5, T6 form is connected into automatic switch by voltage doubling rectifing circuit and electronic switch.

4. multifunction wireless microphone according to claim 3 and Headphone device is characterized in that: the change over switch of connecting between the power supply of the power supply of modulation circuit and radio frequency amplifying circuit and microphone signal amplifying circuit is an automatic change-over.

5. multifunction wireless microphone according to claim 4 and Headphone device is characterized in that: changeover plug is connected with diameter 6.5mm monophony plug by R sound channel in the diameter 3.5mm stereo plug and is constituted.

6. multifunction wireless microphone according to claim 5 and Headphone device is characterized in that: by the R sound channel in the stereo plug by shielding conductor connect with RCA connector, RCA connector constitutes with two sound channels in another stereo plug are in parallel by shielding conductor.

7. multifunction wireless microphone according to claim 6 and Headphone device is characterized in that: the reflector ground wire is arranged to the annular ground wire that extended distance is 0.5cm, and locates weld one 10 μ electrochemical capacitors at M, the N of opening at 2, form ac circuit.