CN2150688Y - Sound accompaniment infra-red tele-listening device for television - Google Patents

Abstract

The utility model provides a sound accompaniment infra-red tele-listening device for television without the use of pulling wires, which is composed of two independent parts: an infrared ray emitter and an infrared ray receiver. The utility model is characterized in that the emission part: an infrared luminous tube D1 is connected with the sound accompaniment output hub of the television through an audion BG1 and coupling capacitor C1, and the infrared luminous tube D1 sends out sound accompaniment infrared light signals. The receiving part: an infrared receiving tube D2 is connected with a secondary audio frequency amplifier which is composed of audions BG2, BG3 and earphones, and the earphones which are connected with the output end of the amplifier send out sounds. Users wear the earphones to watch the television, and the sounds can not interfere other people.

Description

Sound accompaniment infra-red tele-listening device for television

The utility model provides the listening device of the sound accompaniment infrared in a kind of TV receiving apparatus, belongs to electronic technology field.

The sound accompaniment sound source of existing various television receivers, all be to send by the loud speaker of device in TV shell, promptly having partly under following situation near television set, the people is willing to see TV, groups of people are reluctant to see TV in addition, be in as child and do one's assignment or environmental work, study or rest etc. that other people need peace and quiet, and can't avoid beyond the operating distance of the television field frame sound time, existing television set just can't satisfy these two parts people's requirement simultaneously.In order to solve this contradiction, the television set of producing mostly is equipped with sound accompaniment output earphone jack now, in the earphone patchhole, i.e. automatic disconnection on-board speaker circuit, loud speaker is sounding not, observer is put on earphone and is listened to sound accompaniment, just can not disturb contiguous other people.But the shortcoming of this device be earphone with television set between have the about one meter lead of length to link to each other, seeing that closely TV obviously is harmful to beholder's eyesight like this, as adjusting to suitable distance is 3-4 rice, then earphone cord must be increased to respective length, and drag the oversize use of line inconvenient, if any walking in the middle of other people, also line can be mixed disconnected.This attachment device can only be listened to for a people.

The purpose of this utility model is the weak point at said apparatus, design a kind of television field frame infrared ray tele-listening device that need not drag line, the user puts on earphone and watches TV at suitable distance place, television set the place ahead, can arbitrarily walk and listen to sound accompaniment and can not disturb other people, also can use identical receiver independently to listen to the sound accompaniment of same television set for many people simultaneously.

This device radiating portion fixed placement is close at television set.The receiving unit element is few, and with No. 5 batteries of two joints, volume is little, and is in light weight, during use as long as have no occluder before the receiver, not necessarily over against reflector, because of indoor wall also can reflected infrared ray, in indoor audition directivity and not really strong.

The utility model device is finished with the following methods:

This device comprises one by infrared light emission pipe D ₁, triode BG ₁And capacitor C ₁The infrared transmitter that constitutes and one are by infrared receiver tube D ₂, triode BG ₂, BG ₃Infrared ray audio signal reception amplifier with the earphone formation.Its structural feature is infraluminescence pipe D ₁By transistor BG ₁Coupling capacitance C ₁Link to each other infraluminescence pipe D with the television audio output plughole ₁Launch the audio frequency infrared signal; At receiver end, infrared receiving tube D ₂With one by triode BG ₂, BG ₃The input of the secondary audio frequency amplifier of forming for main element is BG ₂Base stage link to each other, be BG at the output of audio frequency amplifier ₃Collector electrode also link to each other with the positive pole of power supply by an earphone.The sound accompaniment infrared signal is by D ₂Receive and be converted to the signal of telecommunication, after audio frequency amplifier amplifies, sound again by earphone.

Below in conjunction with accompanying drawing implementation method is described.

1, the reflector of this device is partly:

Insert with reference to one, 3.5 millimeter two core plug of accompanying drawing in the sound accompaniment output earphone jack of television set, audio signal is taken out, this signal is in resistance R ₁After the last dividing potential drop by capacitor C ₁Be coupled to triode BG ₁Base stage, R ₂Be to be BG ₁Provide the resistance of bias current, R ₃Play stable operating point, C ₂Be triode BG ₁The audio frequency bypass condenser.Signal drives infraluminescence pipe D after triode amplifies ₁Sending intensity goes out with the infrared radiation that audio signal changes.

2, the reception of this device is partly:

With reference to accompanying drawing two, infrared adapter D ₂Receive after sound accompaniment infrared signal that emission partly sends is converted to the signal of telecommunication, it is sent into triode BG ₂Base stage, this small-signal electric current is carried out the first time amplifies, R ₄Be BG ₂Load resistance, the audio voltage signal of Chan Shenging is again through coupling capacitance C thereon ₆Add to the second amplifying stage triode BG ₃Base stage, the tone currents after further amplifying by the corresponding levels, flowing through is serially connected with BG ₃Earphone in the collector circuit is sounded.R ₇, R ₈Obtain BG after the dividing potential drop ₃The bias voltage of base stage, R ₅, R ₉Be BG ₂, BG ₃Emitter resistance, C ₅, C ₇Be respectively BG ₂, BG ₃The audio frequency bypass condenser of emitter.W is a volume control potentiometer, and it is to the BG that flows through ₂The signal of base stage plays shunting action, with control flows to BG ₂The base signal size of current reaches the purpose of controlling earphone sound size.C ₄, C ₈, R ₆Form filtering and decoupling circuit, prevent amplifying circuit self-oscillation.

Claims (3)

1, one by infrared light emission pipe D ₁, infrared receiver tube D ₂, transistor BG ₁, BG ₂, BG ₃Television field frame infrared ray tele-listening device with earphone constitutes is characterized in that infraluminescence pipe D ₁Also by triode BG ₁, coupling capacitance C ₁Link to each other with the television audio output plughole.

2, by the device of claim 1 regulation, it is characterized in that infrared receiving tube D ₂With one by triode BG ₂, BG ₃The input of two utmost point audio frequency amplifiers that constitute is BG ₂Base stage link to each other.

3, by the device of claim 2 regulation, it is characterized in that by triode BG ₂, BG ₃The output of the audio frequency amplifier that constitutes is BG ₃Collector electrode receive the positive pole of power supply by an earphone.

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