CN2328144Y - Wireless earphone - Google Patents

Abstract

The utility model discloses a wireless earphone, which combines radio communication with an ordinary wired earphone and substitute radio for the wire of the wired earphone. The utility model can be connected with a video or an audio for use, which brings convenience to users. When used, the host machine of the wireless earphone is connected with the jack of the video or the audio; the signal of the video or the audio is modulated into a radio-frequency signal by the host machine to be transmitted into space. The wireless earphone can be made into headset which can be worn on head; the user can walk at will within a certain range and appreciate a video program or an audio program under the condition of not affecting other people's learning and rest.

Description

Wireless headset

The utility model relates to a kind of audio-visual equipment, particularly television set.Existing town house condition restriction, in order not influence other people study and work, many people can not teleview at leisure, listen to the music, though available earphone uses only for a people, can not many people listen simultaneously, and the restriction of wired earphone, can not arbitrarily walk about.

The purpose of this utility model is that radio communication is combined with common wired earphone, designs a kind of TV, sound equipment audio signal wireless transmission, receiving system.

The utility model is made up of radio transmitter and receiver, the audio frequency amplifier that radio transmitter comprises potentiometer VP1, be made up of triode Q3, resistance R 12, R13, capacitor C 11, C12, the frequency tripling oscillator that is made of the junction capacitance of triode Q2 and corresponding electric capacity, crystal X1, loop A 123 and variable capacitance diode VD1, the rf power amplifier circuit that is made of triode Q1 and inductor L2 and respective element, filter circuit, matching inductor L1, the antenna be made up of capacitor C 3, C2, C1, coil T1; Its annexation is for connecting successively, voice signal exports audio frequency amplifier to through potentiometer VP1, be coupled to transfiguration second tube sheet VD1 two ends through the audio signal of amplifying by resistance R 11, capacitor C 10, resistance R 8, by the frequency tripling oscillator audio signal is modulated on the carrier wave, the output coils T2 frequency-selecting of oscillator, be coupled to radio frequency amplifier by capacitor C 6, amplifying signal by filter circuit after coupling inductance L 1 is fed to antenna; Wireless headset comprises antenna, capacitor C 1, coil T1, T2, T3 impedance matching and frequency-selective network, the radio frequency amplifier that triode Q1 and coil T4 form, modulation integrated package U1, audio frequency amplifier, its annexation is that frequency-selective network is connected with radio frequency amplifier, radio frequency amplifier coils T4 frequency-selecting is fed to 16 pin of the integrated U1 of determining of modulation, U1 1., 2. pin internal circuit and peripheral crystal oscillator X1, coil L1, capacitor C 5, C6, C7 forms local oscillator, 455KHz filter intermediate frequency is through 3. pin output of U1, again after the 455KHz band-pass filter, by U1 5. pin be input to 6. pin of integrated package U1,7. the IF limiting amplifier of pin inside amplifies, and amplified IF signal is reduced to the low-frequency sound signal in the 8. inner frequency discriminator of integrated package U1.The audio-frequency power amplifier that this signal is formed through three plate pipe Q2, Q3, Q4 and peripheral circuit amplifies, and amplifies output and promotes earphone work, and audio signal is transformed into sound.

Alternating current 220V becomes direct current 12V through the transformer rectifying and wave-filtering, and one the tunnel becomes direct current 6V for the main frame electricity consumption through 7806 integrated package voltage stabilizings, and another Lu Kejing plug charges to wireless headset.

The utility model combines radio communication with common wired earphone, with the line of the alternative wired earphone of radio, it can connect use with television set, sound equipment, greatly facilitates to the user.During use, main frame is received the jack of TV, sound equipment, and the television acoustics signal is modulated into emission of radio frequency signals to the space through main frame, and wireless headset is made wear-type and can be worn on the head, arbitrarily walk about within the specific limits, under the situation that does not influence other people study, has a rest, appreciate the television acoustics program.

Fig. 1 is the main frame electronic-circuit diagram;

Fig. 2 is wireless tramline circuit diagram.

As Fig. 1, the audio frequency amplifier of receiving triode Q3, resistance R 12, R13, capacitor C 11, C12 composition through the main frame output plug from the voice signal of TV, sound equipment output carries out the audio frequency amplification, potentiometer VP1 is used for regulating the size of input audio voltage, in order to change main frame emission frequency deviation, be coupled to variable capacitance diode VD1 two ends through the audio signal of amplifying by resistance R 11, capacitor C 10, resistance R 8, resistance R 9, R10, R8 provide bias voltage for variable capacitance diode VD1, so the junction capacitance of transfiguration second tube sheet VD1 just changes with the variation of audio voltage.

The frequency tripling oscillator that the junction capacitance of triode Q2 and corresponding electric capacity, crystal X1, loop A 123 and variable capacitance diode VD1 constitutes, its feedback voltage is taken from the voltage ratio of capacitor C 8, C9, the junction capacitance of variable capacitance diode VD1 changes the variation that causes frequency of oscillation, and audio signal just is modulated on the carrier wave.

As Fig. 2: the wireless headset antenna receives useful signal, after input impedance matching and frequency-selective network capacitor C 1, coil T1, T2, T3 frequency-selecting, the radio frequency amplifier of delivering to triode Q1 and coil T4 and peripheral circuit composition amplifies, be fed to the inner frequency mixer of 16 pin of integrated package U1 after the high-frequency signal coils T4 frequency-selecting after being exaggerated, carry out difference frequency with local frequency, radio frequency is become the 455KHz intermediate-freuqncy signal.Integrated package U1 1., 2. pin internal circuit and peripheral crystal oscillator X1, coil L1, capacitor C 5, C6, C7 form local oscillator, the 455KHz intermediate frequency is through 3. pin output of integrated package U1, again after the 455KHz band-pass filter, by integrated package U1 5. pin be input to U1 6. pin, 7. the IF limiting amplifier of pin inside amplifies, amplified IF signal is reduced to the low-frequency sound signal in the 8. inner frequency discriminator of U1.The audio-frequency power amplifier that this signal is formed through three plate pipe Q2, Q3, Q4 and peripheral circuit amplifies, and amplifies output and promotes earphone work, and audio signal is transformed into sound.

Claims (1)

1. A kind of wireless headset, form the frequency tripling oscillator that it is characterized in that audio frequency amplifier that radio transmitter comprises potentiometer VP1, is made up of triode Q3, resistance R 12, R13, capacitor C 11, C12, constitutes by the junction capacitance of triode Q2 and corresponding electric capacity, crystal X1, loop A 123 and variable capacitance diode VD1, the rf power amplifier circuit that constitutes by triode Q1 and coil L2 and respective element, filter circuit, matching inductor L, the antenna formed by capacitor C 3, coil T1, capacitor C 2, C1 by radio transmitter and receiver; Its annexation is for connecting successively, voice signal exports audio frequency amplifier to through potentiometer VP1, be coupled to transfiguration second tube sheet VD1 two ends through the audio signal of amplifying by resistance R 11, capacitor C 10, resistance R 8, by the frequency tripling oscillator audio signal is modulated on the carrier wave, the output coils T2 frequency-selecting of oscillator, be coupled to radio frequency amplifier by capacitor C 6, amplifying signal by filter circuit after coupling inductance L 1 is fed to antenna; Wireless headset comprises antenna, capacitor C 1, coil T1, T2, T3 impedance matching and frequency-selective network, the radio frequency amplifier that triode Q1 and coil T4 form, modulation integrated package U1, audio frequency amplifier, its annexation is that frequency-selective network is connected with radio frequency amplifier, radio frequency amplifier coils T4 frequency-selecting is fed to 16 pin of integrated package U1, U1 1., 2. pin internal circuit and peripheral crystal oscillator X1, coil L1, capacitor C 5, C6, C7 forms local oscillator, 455KHz filter intermediate frequency is through 3. pin output of U1, again after the 455KHz band-pass filter, by integrated package U1 5. pin be input to 6. pin of U1,7. the IF limiting amplifier of pin inside amplifies, amplified IF signal is reduced to the low-frequency sound signal in the 8. inner frequency discriminator of U1, this signal is through triode Q2, Q3, the audio-frequency power amplifier that Q4 and peripheral circuit are formed amplifies, amplify output and promote earphone work, audio signal is transformed into sound.

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