CN2279040Y

CN2279040Y - Wireless sound receiving device for TV set

Info

Publication number: CN2279040Y
Application number: CN96241832U
Authority: CN
Inventors: 赵树航
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-08
Filing date: 1996-11-08
Publication date: 1998-04-15
Anticipated expiration: 2006-11-08

Abstract

The utility model relates to a wireless sound receiving device for TV sets, which is composed of a frequency modulated signal transmitting circuit and a frequency modulated sound receiving circuit, wherein the frequency modulated signal transmitting circuit is arranged in a TV, and the signal input end of the frequency modulated signal transmitting circuit is connected with the existing audio output end of a TV through an electronic switch K; the frequency modulated sound receiving circuit is arranged in a remote controller for a TV, and the connecting end of an earphone is connected with an earphone jack arranged on a casing of a TV so as to realize that people can listen the television sound with the earphone plugged in a remote controller under the state of silent of a TV, and the inconvenience of using a long earphone wire plugged in a TV is avoided. The utility model has the advantages of simple structure and convenient operation.

Description

The wireless listening device of television audio

The utility model relates to the wireless listening device of a kind of television audio.

At present if want under the mute of television set state, to listen to television field frame, must be inserted on the television set with very long earphone lead, the listener can not be free movable, very inconvenient; Having on the television set of picture-in-picture function, if want to make the people who watches key frame and little picture, do not disturbing mutually in sound accompaniment, is impossible realize on existing television set.

The purpose of this utility model is to provide a kind of television audio wireless listening device, and it is to realize that by installing the FM signal radiating circuit additional and install fm radio circuit additional in television set in TV remote controller the wireless of television field frame listen to.

The purpose of this utility model is to realize like this, it is made up of FM signal radiating circuit and fm radio circuit, the FM signal radiating circuit is contained in the television set, and its signal input part connects existing audio output 1,2 on the television set by two gear electronic switch K; Fm radio circuit comprises the earphone link, and this circuit is contained in the TV remote controller, and the earphone link is connected with earphone jack on being located at shell.The television set that picture-in-picture function is arranged, the signal input part of FM signal radiating circuit connects large and small picture audio output 1,2 and 1,3 respectively by three gear electronic switch K.Electronic switch K is subjected to mute button and little picture sound accompaniment by key control.

The formation of FM signal radiating circuit is: by two or three driving switch K connection electrical resistance R3, resistance R 2, capacitor C 1, resistance R 3 connection electrical resistance R1, resistance R 1 connection electrical resistance R2, capacitor C 1, K switch also connects capacitor C 2, capacitor C 2 connection electrical resistance R4, the base stage of higher-order of oscillation triode VT1 connects K switch respectively, capacitor C 2, capacitor C 1, resistance R 2, the collector electrode of triode VT1 connects capacitor C 3, inductance L, coupling capacitance C4, positive feedback capacitor C 5, capacitor C 6 two ends joining powers, capacitor C 3, C1, C5, resistance R 2, R3, R4, one grade of contact of second gear K switch is connected another grade neutral gear with 2 ends; Two grades of contacts of third gear switch K are connected another grade neutral gear with 2,3 ends respectively.

The formation of fm radio circuit is: connect capacitor C 23 by antenna, C22, capacitor C 23, C22 connects 13 of inductance L 2 and integrated circuit (IC), 14 pin, inductance L 2 and capacitor C 22 connect capacitor C 14, pin 6 connects inductance L 1, capacitor C 21, C19, capacitor C 21 series capacitance C20, pin 5 connects capacitor C 5, pin 4 connects capacitor C 4, the emitter of triode BG1 connects capacitor C 4, C19, C26, C18, C17, C15, C12, C11, C8, C1, C3, C20, inductance L 1, resistance R 4, power supply, and by squelch switch K1 connection electrical resistance R5, its collector electrode connects LED, its base stage connects pin 1 by resistance R 2, capacitor C 1, resistance R 4, pin 4 connects capacitor C 4, pin 3 connects capacitor C 3, pin 2 connection electrical resistance R4, the base stage of triode BG2, resistance R 1, capacitor C 2, the base stage connection electrical resistance R4 of triode BG2, collector electrode connects capacitor C 26, resistance R 4, squelch switch K1, power supply, emitter connects capacitor C 25, resistance R 3, inductance L 3 connects capacitor C 25 and earphone link, collector and emitter connects capacitor C 26, power supply, pin 16 ground connection, pin 18 connects capacitor C 18, pin 17 connects capacitor C 17, and pin 15 connects capacitor C 15, and pin 12 connects capacitor C 12, pin 11 connects capacitor C 11, C10, pin 10 connects capacitor C 10, and pin 7 and pin 9 connect capacitor C 7, and pin 8 connects capacitor C 8.

Fig. 1 is FM signal radiating circuit figure of the present utility model

Fig. 2 is fm radio circuit figure of the present utility model

Circuit theory is as follows: the transistor VT1 in the FM signal radiating circuit is a higher-order of oscillation pipe, C5 is a positive feedback electric capacity, it makes transistor VT1 starting of oscillation work, and vibration is constantly produced, frequency of oscillation mainly by inductance L and electric capacity decision, as the base stage of audio signal to transistor VT1, makes transistor VT1 emitter junction electric capacity change with audio signal, then by after the high-frequency signal modulation, thereby reach the purpose of frequency modulation.At last the high-frequency signal of modulation being delivered to antenna by the collector electrode of transistor VT1 through coupling capacitance C4 outwards launches; Power supply can adopt the 1.5V dry cell.

Fm radio circuit mainly is made up of fremodyne, and fremodyne is made up of extensive monolithic radio reception application-specific integrated circuit (TDA7000), has the noise elimination function; The power supply power supply of remote controller.TDA7000 is the integrated circuit of special-purpose FM receiver, inside comprise frequency conversion, in put, frequency discrimination and preposition low putting.This integrated circuit is the Low Medium Frequency that adopts 70KHz.Because intermediate frequency reduces, and can adopt rc active filter, and resistance and amplifier are contained in IC interior, the outside only connects fixed capacitor, has saved external Lc intermediate frequency transformer, and peripheral cell is reduced, and debugs simpler; Power supply can adopt the 3V dry cell.

Its use principle is as follows: headset plug is inserted in the earphone jack on the TV remote controller, fm radio circuit work in the remote controller, when the mute button of pressing on the remote controller housing face-plate, two gear electronic switch K closures in the television set, the work of FM signal radiating circuit, like this television audio signals with the form of frequency-modulated wave by emitting in the television set, receive the FM signal that television transmission is come out by the fm radio circuit in the remote controller, by transforming FM signal is transferred to audio signal, listen to the earphone that is inserted on the remote controller.

The television set that picture-in-picture function is arranged, except that realizing above-mentioned functions, because the FM signal radiating circuit in the television set connects respectively greatly by three gear electronic switches, little picture audio output, press little picture sound accompaniment button, electronic switch K connects the audio frequency output of little picture, disconnect the audio frequency output of key frame, little picture audio frequency emits with the frequency modulation form, what remote controller received is the sound accompaniment of little picture, like this when television set is raised living device and is the key frame sound accompaniment, with the sound accompaniment that the earphone that is inserted on the remote controller is listened to little picture, the people that watches key frame and the people of little picture are not disturbed mutually in sound accompaniment.

The utility model has the advantages that owing in television set, install FM signal emission electricity additional Road and in TV remote controller, install fm radio circuit additional, thus be implemented in television set Under the mute state, listen to television field frame with the earphone that is inserted on the remote controller, avoided usefulness Very long earphone cord is inserted in the inconvenience on the television set, the listener when listening to, can from By activity; The television set that picture-in-picture function is arranged, except above-mentioned advantage is arranged, also can be at electricity When raising living device and be the key frame sound accompaniment depending on machine, listen to the earphone that is inserted on the remote controller The sound accompaniment of little picture, the people who makes the people that watches key frame and little picture in sound accompaniment mutually not Disturb. The utility model is simple in structure, and is easy to use.

Claims

1, the wireless listening device of a kind of television audio, it is characterized in that forming by FM signal radiating circuit and fm radio circuit, the FM signal radiating circuit is contained in the television set, and its signal input part connects existing audio output 1,2 on the television set by two gear electronic switch K; Fm radio circuit comprises the earphone link, and this circuit is contained in the TV remote controller, and the earphone link is connected with earphone jack on being located at shell.

2, the wireless listening device of television audio as claimed in claim 1, it is characterized in that having the television set of picture-in-picture function, the signal input part of FM signal radiating circuit connects large and small picture audio output 1,2 and 1,3 respectively by three gear electronic switch K.

3, the wireless listening device of television audio as claimed in claim 1 or 2, the formation that it is characterized in that the FM signal radiating circuit is: by two or three driving switch K connection electrical resistance R3, resistance R 2, capacitor C 1, resistance R 3 connection electrical resistance R1, resistance R 1 connection electrical resistance R2, capacitor C 1, K switch also connects capacitor C 2, capacitor C 2 connection electrical resistance R4, the base stage of higher-order of oscillation triode VT1 connects K switch respectively, capacitor C 2, capacitor C 1, resistance R 2, the collector electrode of triode VT1 connects capacitor C 3, inductance L, coupling capacitance C4, positive feedback capacitor C 5, capacitor C 6 two ends joining powers, capacitor C 3, C1, C5, resistance R 2, R3, R4, one grade of contact of second gear K switch is connected another grade neutral gear with 2 ends; Two grades of contacts of third gear switch K are connected another grade neutral gear with 2,3 ends respectively.

4, the wireless listening device of television audio as claimed in claim 1 or 2, the formation that it is characterized in that fm radio circuit is: connect capacitor C 23 by antenna, C22, capacitor C 23, C22 connects 13 of inductance L 2 and integrated circuit (IC), 14 pin, inductance L 2 and capacitor C 22 connect capacitor C 14, pin 6 connects inductance L 1, capacitor C 21, C19, capacitor C 21 series capacitance C20, pin 5 connects capacitor C 5, pin 4 connects capacitor C 4, the emitter of triode BG1 connects capacitor C 4, C19, C26, C18, C17, C15, C12, C11, C8, C1, C3, C20, inductance L 1, resistance R 4, power supply, and by squelch switch K1 connection electrical resistance R5, its collector electrode connects LED, its base stage connects pin 1 by resistance R 2, capacitor C 1, resistance R 4, pin 4 connects capacitor C 4, pin 3 connects capacitor C 3, pin 2 connection electrical resistance R4, the base stage of triode BG2, resistance R 1, capacitor C 2, the base stage connection electrical resistance R4 of triode BG2, collector electrode connects capacitor C 26, resistance R 4, squelch switch K1, power supply, emitter connects capacitor C 25, resistance R 3, inductance L 3 connects capacitor C 25 and earphone link, collector and emitter connects capacitor C 26, power supply, pin 16 ground connection, pin 18 connects capacitor C 18, pin 17 connects capacitor C 17, pin 15 connects capacitor C 15, pin 12 connects capacitor C 12, and pin 11 connects capacitor C 11, C10, pin 10 connects capacitor C 10, pin 7 and pin 9 connect capacitor C 7, and pin 8 connects capacitor C 8.