CN2338927Y - Ear phone type receiver for receiving audio signal of television - Google Patents

Abstract

The utility model relates to a wireless earphone for a TV. The utility model is characterized in that the wireless earphone comprises an audio signal transmitter and an audio signal receiver, wherein the transmitter is provided with a plug which is used for extracting audio signals and can be plugged in an AV jack of a TV or an earphone jack, and the audio signal receiver is provided with an earphone. The utility model can not only transmit and receive TV audio signals through crossing the obstacles of residential houses, but also has the advantages of small volume and low cost.

Description

The television set wireless headset

The utility model relates to a kind of television set wireless headset.

Existing a kind of television set wireless headset that uses in the residential houses is an energy reflector and an energy that the audio signal of TV converts infrared wave to be made of the receiver that infrared wave is reduced into audio signal.The shortcoming that exists: the one, infrared ray in transmission if run into human body or other obstacle signals can't transmit; The 2nd, volume is big, cost is high.

The purpose of this utility model is that a kind of television set wireless headset will be provided, and it not only can pass through the barrier transmission in the residential houses, receive the audio signal of television set, and volume is little, and cost is low.

The utility model comprises: audio signal reflector and voice-frequency signal receiver, reflector are provided with the plug in order to the extraction audio signal that can insert television set AV jack or earphone jack, and audio signal receiver is provided with earphone.

Than existing television set wireless headset with infrared wave transmission signal, the utlity model has following remarkable advantage: 1) the signal transmission effect is good.The utility model is because with the audio signal electromagnetic wave transmission signal.Therefore, the audio signal energy penetrate thing that its reflector sends passes to receiver.2) volume is little, cost is low, and is easy to use.The former need adopt a plurality of infrared, receiving tube, and reflector with the civil power transformation after as working power, so volume is big, cost is high.The utility model then mainly adopts not only simple structure of cheap electronic component commonly used, and the power consumptive province.As reflector, adopt No. 7 batteries of a joint can use 1 wheat harvesting period.

Below in conjunction with drawings and Examples the utility model is specifically described.

Fig. 1 is an audio signal reflector functional-block diagram of the present utility model.

Fig. 2 is an audio signal reflector embodiment circuit diagram.

Fig. 3 is the transmitting antenna organigram of audio signal reflector, and 2 for being printed on the transmitting antenna on the circuit board among the figure.

Fig. 4 is an audio signal reflector view.(3 is transmitter switch among the figure; 4 is in order to insert the plug of television set earphone jack; 5 is in order to insert the standby plug of television set AV jack.)

Fig. 5 is a voice-frequency signal receiver functional-block diagram of the present utility model.

Fig. 6 is a voice-frequency signal receiver embodiment circuit diagram.

Fig. 7 is the voice-frequency signal receiver view.

With reference to accompanying drawing, the utility model comprises: comprise audio signal reflector and audio signal receiver.Reflector is provided with and can inserts television set AV jack, or the plug in order to the extraction audio signal of earphone jack, and audio signal receiver is provided with earphone.

Above-mentioned audio signal reflector is by the plug 1 that extracts the tv audio signal, and multi resonant modulating oscillation circuit and transmitting antenna 2 connect to form, and audio signal receiver is by reception antenna, and audio frequency receives circuit part, and power amplifier part and earphone are formed.Transmitting antenna 2 on the audio signal reflector is for being printed on the comb teeth shape part printed circuit on the circuit board.The topped scope of the frequency of oscillation of multi resonant modulating oscillation circuit is whole FM, i.e. 88MHZ-108MHZ.The audio signal that audio frequency reception circuit part is made up of TDA7088T integrated package and peripheral electron element thereof is searched for receiving circuit automatically.

Reflector operating circuit such as Fig. 2 of the utility model embodiment.Its operation principle is as follows: from the audio signal of television set, through potentiometer W dividing potential drop, capacitor C ₁Be coupled to the modulating emission circuit of multivibrator, frequency of oscillation is by L, C ₂Form, regulate inductance L and can cover whole FM (88HMZ-108HMz) frequency range.

The operating circuit of the audio signal receiver of embodiment such as Fig. 5.The TDA7088T integrated circuit that this machine adopts Philips company to produce, it is made up of mixting circuit, local-oscillator circuit, intermediate frequency amplification and amplitude limiter circuit, frequency-discriminating circuit, squelch circuit and AFC circuit.It selects the 70KHZ IF-FRE for use, intermediate frequency is selected to be realized by the inner RC active filter of integrated package, and adopt frequency-locked loop (FLC) technology to compress the bandwidth of intermediate-freuqncy signal, with the IF-FRE that satisfies 70KHZ to the intermediate frequency signal bandwidth, with the restriction of the IF-FRE that satisfies 70KHZ to the intermediate frequency signal bandwidth.Aerial signal is through C ₁Coupling is separated C through intermediate-frequency filter from intermediate-freuqncy signal after being selected into mixting circuit and local oscillation signal mixing from integrated circuit TDA7088T (11) pin ₂It is the interchange shunt capacitance of radio frequency input stage.C ₃, C ₄, C ₅, C ₆Form R with internal circuit _cThe intermediate frequency filtering circuit.C ₇Be that intermediate frequency amplitude limiting amplifier circuit input stage exchanges shunt capacitance.C ₈For frequency discriminator electric capacity it and internal circuit constitute 90 ° of phase-shift networks of intermediate-freuqncy signal always.C ₁₁It is the output capacitance of mute control circuit.C ₁₂Be the maintenance electric capacity of tuning voltage, be connected on (16) pin, and by resistance R ₁With C ₁₂On tuning voltage be added to variable capacitance diode D ₁On.Variable capacitance diode D ₁And inductance L, and the variable capacitance diode of circuit inside constitutes local oscillation circuit together.C ₁₄It is the tuning voltage capacitance.C ₁₃It is the power supply decoupling capacitance.Divide two-way from the audio signal of TDA7088T (2) pin output, the one tunnel connects C ₁₀And R ₂Form the de-emphasis network that FM broadcasting receives, another road connects coupling electrochemical capacitor C ₁₅Anode, negative terminal connects the base stage of power amplifier three-phase pipe BG.R ₃Be the inclined to one side value resistance of BG triode, the volume of receiver is to regulate k by the emitter series resistor that changes transistor BG ₄Be the volume by-pass cock, divide high and low two grades of volume, from transistor collector with ground and meet C ₁₇Electric capacity, its effect are the high-frequency noises that suppresses power amplifier.Potential winding L ₂Be the retardation coil of radiofrequency signal, to stop aerial signal on the machine line by the distributed capacitance of earphone coil and power amplifier output capacitance C ₁₇Shunting, C ₁₆Electrolytic capacitor is a power filtering capacitor.

The course of work of the utility model embodiment is as follows: transmitter is inserted the television set earphone jack, tv volume is transferred to moderate position, (television set is not if there is earphone jack, another plug 5 of available backup is connected to the AV jack), volume is closed simultaneously, open transmitter switch, reflector just begins emission work.

Receiver is connected earphone, turn on the power switch button K ₁, click search button K ₃, circuit just voluntarily by the low side frequency to high-end frequency search, once receive the radio station, just stop search, if will listen to next radio station, as long as click the search button again, this can trace into the sound of required TV programme like this.When clicking reset button K ₂The time, circuit will be got back to the low-limit frequency end immediately.When pressing sound volume button K ₄The time, it is big that volume becomes, to satisfy user's needs.

This receiver also can be used as a broadcast receiver with the senior automatic function of search of frequency modulation separately and use, and method of operation is the same.

Embodiment of the present utility model has not only solved other people problem of sound equipment interference when televiewing, and therefore its receiver also can have bigger application value separately as a FM receiver use.

Claims (5)

1, a kind of television set wireless headset, it is characterized in that: comprise audio signal reflector and audio signal receiver, reflector is provided with and can inserts television set AV jack, or the plug in order to the extraction audio signal of earphone jack, and audio signal receiver is provided with earphone.

2, television set wireless headset according to claim 1 is characterized in that: the transmitting antenna on the audio signal reflector is the comb teeth shape part printed circuit that is printed on the circuit board.

3, television set wireless headset according to claim 1 and 2, it is characterized in that: the audio signal reflector is by the plug that extracts the tv audio signal, multi resonant modulating oscillation circuit and transmitting antenna connect to form, audio signal receiver is by reception antenna, audio frequency receives circuit part, and power amplifier part and earphone are formed.

4, television set wireless headset according to claim 3 is characterized in that: the topped scope of the frequency of oscillation of multi resonant modulating oscillation circuit is whole FM, i.e. 88MHZ-108MHZ.

5, television set wireless headset according to claim 3 is characterized in that audio frequency receives the audio signal that circuit part is made up of TDA7088T integrated package and peripheral electron element thereof and searches for receiving circuit automatically.

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