CN2414566Y

CN2414566Y - Remote lisening device for television set

Info

Publication number: CN2414566Y
Application number: CN 00224167
Authority: CN
Inventors: 程山
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-28
Filing date: 2000-01-28
Publication date: 2001-01-10
Anticipated expiration: 2010-01-28

Abstract

The utility model discloses a remote listening device for a television, which comprises an audio transmitter and an audio receiver of the television. Since the utility model uses a simpler circuit, the utility model has the characteristics of fewer components, simple structure, low manufacture cost, and low price, and the defect that the learning and the resting of another people can be disturbed when a user watches the television can be overcome in the process of using.

Description

Distant tin of device of television set

The utility model relates to a kind of television audio emission receiving device.

When turning on the television set TV reception, the sound of TV programme can disturb other people study and the generation of having a rest, influence other people study and rest, particularly family has child to want homework or the people that is on the night shift will rest the time, other people have to not see TV, though the TV that now has has earphone, general earphone cord is too short, the width of cloth of picture tube is penetrated people's eyes and health is produced harm, influences healthy.

The purpose of this utility model is to provide a kind of cost television set low, easy to use distant tin of device.

The purpose of this utility model is achieved through the following channels: distant tin of device of television set, comprise audio transmitter and voice receiver, and the circuit of described voice receiver is: reception antenna is connected with 12 pin of integrated package TDA7021; 3 pin of the input termination integrated package TDA7021 of high-frequency generator, output is connected on 1,2 pin of integrated package TDA7021, boost-voltage regulator is connected on 3 pin of integrated package TDA7021, on 4,5 pin of integrated package TDA021, connect the frequency division receiver, described frequency division receiver is by coil L, block switch K and capacitor C 1, C2, C3, C4, C5 form, and 2 pin of power discharging integrated block TDA7052 are connected with 14 pin of integrated package TDA7021, and loudspeaker Y B is connected with 5,8 pin of power discharging integrated block TDA7052; It is characterized in that: the circuit of described audio transmitter is: deamplification resistance R 1 connects the emitter of triode NC, divider resistance R2, R3 takes out audio signal and is connected on triode NC in base stage through capacitor C 1, capacitor C ' 2, C ' 1 also is connected in the base stage of triode NC, at the base stage of triode NC biasing resistor R4 in parallel, series connection dividing potential drop capacitor C ' 4 of emitter and base stage, capacitor C ' 3 are connected in parallel between the collector and emitter, coil L1 block switch K1 and capacitor C 6, C7, C8, C9 composes in parallel frequency divider and is connected on the collector electrode of triode NC, and antenna is penetrated in capacitor C ' 5 sending and receiving.Originally be no more than 40 yuan, volume is little, and is in light weight, and transmitter places by the television set, and the receiver use that is easy to carry also overcomes wired earphone, and TV watching person moves inconvenient shortcoming, if family has multiple TV set, avoids mutual interference.

Following condensation accompanying drawing is described in further detail the utility model:

Fig. 1 is the circuit diagram of audio transmitter;

Fig. 2 is the circuit diagram of voice receiver;

The emission of Fig. 3 television audio, recipient's block diagram.

As shown in Figure 1, deamplification resistance R 1 connects in the emitter circuit of triode NC, divider resistance R2, R3 takes out the base stage that through capacitor C ' 1 is connected on triode NC with audio signal, capacitor C ' 2, C1 also is connected in the base stage of triode NC, the modulation of emission distance is done in ' 2 to use capacitor C, simultaneously at the base stage of triode NC biasing resistor R4 in parallel, series connection dividing potential drop capacitor C ' 4 between emitter and base stage, make the oscillation point of triode NC reach relative stablizing, capacitor C ' 3 also are connected between the collector and emitter, the modulation of the logical extra wide degree of working frequency, with coil L1 block switch K1 and capacitor C 6, C7, C8, C9 composes in parallel frequency divider, is connected on the collector electrode of triode NC, in order to control radiofrequency signal on any four points of 66-108MHZ, directionally after the vibration, ' 5 coupling is to transmitting antenna by capacitor C.

As shown in Figure 2, reception antenna is connected with 12 pin of integrated package TDA7021,3 pin of the input termination integrated package TDA7021 of high-frequency generator, output is connected on 1,2 pin of integrated package TDA7021, boost-voltage regulator connects on 3 pin of integrated package TDA7021, on 4,5 pin of integrated package TDA7021, connect the frequency division receiver, described frequency division receiver is by coil L, block switch K and capacitor C 1, C2, C3, C4, C5 form, 2 pin of power discharging integrated block TDA7052 are connected with 14 pin of integrated package TDA7021, and loudspeaker Y B is connected with 5,8 pin of power discharging integrated block TDA7052.

As shown in Figure 3, after television audio signals outputs to the audio transmitter vibration, outwards emission, voice receiver receives television audio signals.

Claims

1. distant tin of device of a television set comprises audio transmitter and voice receiver, and the circuit of described voice receiver is: reception antenna is connected with 12 pin of integrated package TDA7021; 3 pin of the input termination integrated package TDA7021 of high-frequency generator, output is connected on 1,2 pin of integrated package TDA7021, boost-voltage regulator is connected on 3 pin of integrated package TDA7021, on 4,5 pin of integrated package TDA021, connect the frequency division receiver, described frequency division receiver is by coil L, block switch K and capacitor C 1, C2, C3, C4, C5 form, and 2 pin of power discharging integrated block TDA7052 are connected with 14 pin of integrated package TDA7021, and loudspeaker Y B is connected with 5,8 pin of power discharging integrated block TDA7052; It is characterized in that: the circuit of described audio transmitter is: deamplification resistance R 1 connects the emitter of triode NC, divider resistance R2, R3 takes out audio signal and is connected on triode NC in base stage through capacitor C 1, capacitor C ' 2, C ' 1 also is connected in the base stage of triode NC, at the base stage of triode NC biasing resistor R4 in parallel, series connection dividing potential drop capacitor C ' 4 of emitter and base stage, capacitor C ' 3 are connected in parallel between the collector and emitter, coil L1 block switch K1 and capacitor C 6, C7, C8, C9 composes in parallel frequency divider and is connected on the collector electrode of triode NC, and antenna is penetrated in capacitor C ' 5 sending and receiving.