CN2331139Y

CN2331139Y - TV receiver set high-frequency cordless earphone

Info

Publication number: CN2331139Y
Application number: CN 98213597
Authority: CN
Inventors: 吕田
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-21
Filing date: 1998-03-21
Publication date: 1999-07-28
Anticipated expiration: 2008-03-21

Abstract

The utility model relates to a high-frequency cordless earphone for TV sets, which belongs to a cordless acoustic device for TV sets. The utility model comprises an emitter and a receiver. Audio signals are emitted by the emitter in the form of electromagnetic waves, and then the electromagnetic waves are restored to the audio signals by the receiver which has the identical local frequency with the frequency of the emitter so as to realize the function of wireless listening. The utility model solves the problems of high cost in fabrication and poor effect in listening existing in the existing induction type and infrared type cordless headphones. The utility model has the advantages of simple structure, low cost and convenient carrying. The utility model does not generate disturbance and can not be disturbed.

Description

Television set high frequency cordless headphone

Television set high frequency cordless headphone of the present utility model belongs to a kind of television set wireless acoustics device, relates in particular to a kind of television set cordless headphone, and its classification number is: H04.

Present cordless headphone mostly is far infrared type and induction type, and far infrared type is to transfer the sound source signal of telecommunication to infrared form to emit, and needs infrared modulated to conciliate the line transfer road, so cost of manufacture is higher; Induction type is subjected to the influence of surrounding magnetic field because of meeting, so result of use is relatively poor.

The purpose of this utility model provides a kind of television set high frequency cordless headphone that sound is only spread out of by earphone with the high frequency form.

The utility model is made up of reflector and receiver two parts, the frequency of oscillation of the internal circuit of reflector is identical with the local frequency of receiver, reflector emits audio signal with the electromagnetic wave form, by receiver electromagnetic wave is reduced to audio signal again, realizes the wireless function of listening to.

Accompanying drawing 1 is the structural representation of reflector of the present utility model.

Accompanying drawing 2 is internal circuit diagrams of reflector of the present utility model.

Accompanying drawing 3 is structural representations of receiver of the present utility model.

Below in conjunction with accompanying drawing the utility model being done one describes in detail.

The utility model comprises reflector 1 and receiver 2 two parts, reflector 1 comprises shell 3, internal circuit 4, antenna 5, sub-plug 7 of headset plug 6 and audio input end and battery 12, two plugs 6 of reflector 1 or 7 are got one to be inserted on the television set on the corresponding socket, after the audio signal of television set sound source reaches adjustable resistance w1 dividing potential drop, reaching high frequency low-power triode BG amplifies, audio signal after will amplifying again is added on the LC high frequency of oscillation electromagnetic wave that is produced down by variable capacitance C and inductance coil L1 acting in conjunction, and the antenna 5 by reflector 1 emits at last; Receiver 2 comprises shell 8, internal circuit 9, loud speaker 10, antenna 11, battery 12, the local frequency of reflector 2 is identical with the tranmitting frequency of reflector 1, after receiver 2 receives the electromagnetic wave signal that reflector 1 spreads out of by antenna 11, by coupling, through inner high frequency amplification, mixing, intermediate frequency filtering amplification, amplitude limit, frequency discrimination, and residual intermediate frequency of elimination and harmonic wave, reach the loud speaker 10 of receiver 2 at last by power amplifier, like this, the sound of television set just sends from cordless headphone.

The utility model is simple in structure, and volume is little, and cost of manufacture is low, and is easy to carry, do not produce interference, and also not disturbed, result of use is good.

Claims

1, a kind of television set high frequency cordless headphone, comprise reflector (1) and receiver (2), it is characterized in that reflector (1) is made up of shell (3), internal circuit (4), antenna (5), headset plug (6) and the sub-plug of audio input end (7), receiver (2) is made up of shell (8), internal circuit (9), loud speaker (10), antenna (11), reflector (1) changes audio signal into electromagnetic wave signal and sends and deliver to receiver (2), and receiver (2) is reduced to electromagnetic wave signal voice signal again and sends by loud speaker (10); The local frequency of receiver (2) is identical with the frequency of oscillation of reflector (1).

2, television set high frequency cordless headphone as claimed in claim 1 is characterized in that internal circuit (4) comprises the LC high-frequency oscillating circuits that adjustable resistance W1 dividing potential drop, high frequency low-power triode BG are amplified, are made up of variable capacitance C and inductance coil L1.

3, television set high frequency cordless headphone as claimed in claim 1 is characterized in that the headset plug (6) of reflector (1) inserts on the television set receiver J-Horner.

4, television set high frequency cordless headphone as claimed in claim 1 is characterized in that the sub-plug of audio input end (7) of reflector (1) inserts on the television set earpiece audio output socket.