CN2418627Y - External-conneted earphone intercommunicating device for fixed telephone set - Google Patents

Abstract

The utility model relates to an external connection earphone intercommunicating device for a fixed telephone set, which expands the hand free function of the existing telephone set into the intercommunicating function of an external connection earphone. The utility model is properly added with switching circuits so that the function of a fixed telephone set is improved. The users do not need to hold the receivers when the users have a conversation. The utility model has the advantages of convenient operation, favorable intercommunicating effect, reduced fatigue and enhanced work efficiency.

Description

The external earphone talkback unit of landline telephone

The utility model relates to the electronic communication technology field.

The receiver of existing telephone set is that receiver and transmitter are installed in two ends of listening in the cylinder shell respectively, when making a phone call, with holding receiver, receiver one end is close to ear, and with the close sound generation source of transmitter one end, the shortcoming of a maximum of this mode that receives calls will held receiver with one exactly, when needs receive calls on one side, keep a record on one side or other operation (for example: inspection information, operating computer etc.) time, often think that hand is not enough, at this moment have to temporarily receiver be clamped with neck and shoulder, keep a short time, busy clerk always the case.

There are some telephone sets to be provided with hands-free device, receiver (little loud speaker) and transmitter (microphone) are installed in the main station, click Hands-free key during use earlier, just talk line is transferred on the hands-free device, need not to hold receiver and just realized conversation, the shortcoming of this device is an interference environment, allows the those present hear dialog context, can not be too far away during conversation from telephone set, also be inconvenient for the personnel that will leave the seat inspection information.

The purpose of this utility model is to change traditional earphone structure, uses receiver and transmitter instead the earplug Worn type, need not to hold receiver during conversation, and its communication effect is then with to use traditional receiver the same, and people's both hands are freed, and increases work efficiency.

The utility model is to realize like this, horn wire and microphone lines in the existing telephone machine handfree circuit are drawn, be connected with external microphone with external earphone respectively, establish a link on the lug machine outside, external earphone can be suspended on user's the ear or head, external microphone is hung in the intercommunication position, good communication effect be arranged in order to make outer external earphone and external microphone, add on the lug machine circuit outside to be subjected to words to adjust circuit, on external microphone lines road, add and send the words amplifying circuit.

The utility model changes the hand-held of conventional telephone set receiver into the earphone Worn type, need not to hold receiver during conversation, and people's both hands are freed, and easy to use, communication effect is good, and the user can reduce fatigue, increases work efficiency.

The contrast accompanying drawing is further described below.

Accompanying drawing 1 is a structural representation of the present utility model,

Accompanying drawing 2 is a wiring example of the present utility model.

Design a change-over circuit 3 earlier, adjust circuit (R1 comprising being subjected to words, R2) and send words amplifying circuit (Q1), be subjected to words to adjust circuit (R1, R2) interface J1 inserts on the hands-free horn wire of existing telephone machine circuit, send the interface J2 of words amplifying circuits (Q1) to insert on the hands-free microphone line of existing telephone machine circuit, this change-over circuit 3 is made little circuit board be installed in the telephone set 4, also part can be installed directly on existing teleset line plate.Be subjected to words to adjust circuit (R1, R2) another interface J3 receives external earphone 1, send another interface J4 of words amplifying circuits (Q1) to receive external microphone 2, on earphone 1, be provided with a link 5, link 5 is suspended on user hard of hearing, earphone 1 is fixed in one's ear, microphone 2 is hung in the intercommunication position with a pole 6.

Earlier the hands-free button 7 of telephone set 4 is pressed during use, at this moment microphone is replaced by external earphone 1 and external microphone 2, and the calling signal is delivered to earphone 1 after R1 and R2 decay, and the reply signal is delivered to by microphone 2 and sent into main frame after Q1 amplifies, and realizes conversation.

Talk-through clicks Hands-free key 7 again, cuts off the utility model function and transfers hand-held receiver function of use to.

Claims (2)

1, the external earphone talkback unit of landline telephone is made of earphone (1) and microphone (2), and it is characterized in that: earphone (1) and microphone (2) are placed on the outside of telephone set (4).

2, the external earphone talkback unit of landline telephone according to claim 1, it is characterized in that: on the circuit that connects external earphone (1), have one to be subjected to words to adjust circuit (R1, R2), on the circuit that connects external microphone (2), send words amplifying circuit (Q1).

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