CN2266848Y - Calling system connector for telephone - Google Patents

Abstract

The utility model relates to a telephone connector for a calling system, comprising a connecting support and a control circuit. An induction coil and a loudspeaker are correspondingly below the connecting support. One end of the induction coil and the loudspeaker is connected with a calling device or other voice experimental device, and the other end is connected with a public end of a circuit. The loudspeaker is connected with two-stage amplifiers serially connected through capacitance, and output terminals of the amplifiers are connected with a frequency detection circuit. The telephone connector for the calling system is a product with which the calling system can be communicated with an external line telephone without connecting into a telephone network. The impedance characteristic of the telephone network is not affected, and whistler caused by the sound feedback can not be produced. Using the utility model is equal to extending the external line telephone into a guest room.

Description

The paging system phone connector

The utility model belongs to the interface arrangement of telephone network, relates to a kind of paging system phone connector.

The current communication technology has had very high level and various means.Develop into beeper, mobile telephone, cordless telephone, TV acoustic image phone etc. from common phone.The equipment of writing to each other of these new and high technologies brings great convenience to society undoubtedly.The little hotel of the student dormitory of some institution of higher learning, dormitory, middle school even some equipment deficiencies, hostel etc. also can't resolve dormitory and the outside problem of directly taking on the telephone but even to this day.When outside line is called, can only shout or call out with the call personnel by the wired broadcasting pager.After being subjected to words side to hear cry, rush out of, go to connect and be located at only outside line in the reception room from the room.This call mode had both caused overworking of call personnel, had prolonged the holding time of outside line again, also caused noise jamming in the building simultaneously, influenced the normal study and work of people.Convenient for pursuing conversation, also there are some units often to use and remove lock, thereby external call circuit and inner call equipment are interconnected.But because the off-hook resistance of phone is about 300 ohm, on-hook resistance is infinitely great.So units concerned's regulation: phone does not allow random parallel operation, the various call equipment that unit uses, experiment speech ciphering equipment etc. be non-goes into net arrangement, this definitely can not directly insert the local telephone communication net, because will have a strong impact on communication quality by electronic circuit (or switch).

The purpose of this utility model is to design a kind of can the isolation with telephone communication network, the paging system phone connector that can communicate with the user again.

The purpose of this utility model realizes by following scheme: the paging system phone connector comprises connection support and control circuit.Control circuit comprises electromagnetic induction coil, loudspeaker, the two poles of the earth amplifier, frequency detection circuit etc.Described connection support below correspondence is equipped with induction coil and loudspeaker.And an end of induction coil and loudspeaker and call equipment or other phonetic experiment equipment join, the public land end of other end connecting circuit.Loudspeaker connect the dual-stage amplifier that is connected in series by an electric capacity simultaneously, and amplifier out connects frequency detection circuit.

The paging system phone connector is to allow paging system (or other can not directly be connected into the speech ciphering equipment of telephone communication network) needn't insert telephone network and a kind of product that can connect with outside line.It directly sends signal with voice to phone network again by the signal in the electromagnetic induction reception phone network, so neither influences the impedance operator of phone network, can not produced by sound feedback again and utter long and high-pitched sounds.Therefore with this connector with after speech ciphering equipment is connected, equal outside line has been extended to guest room (residence), can avoid the call personnel to raise a cry and the noise jamming that causes, reduced unnecessary the walking about of guest, and saved air time and expense.

Fig. 1 is an electrical schematic diagram of the present utility model

Below in conjunction with accompanying drawing and to be with the duplex wired paging system of BX-958 of Beijing University of Post ﹠ Telecommunication north Xiang company development that example specifies as follows:

As shown in Figure 1: the paging system phone connector comprises connection support and control circuit.The lower position correspondence of described connection support 1 is equipped with electromagnetic induction coil 2 and loudspeaker 3.The mounting distance of its medium-height trestle and coil and loudspeaker should be as far as possible little.Connecting support 1 is made by insulating material.Electromagnetic induction coil 2 and loudspeaker 3 one ends and call equipment or other phonetic experiment equipment 4 (in the present embodiment, with the main frame of the duplex wired paging system of BX-958) join the public land end of other end connecting circuit.Loudspeaker 3 connect the dual-stage amplifier 6,7 that is connected in series by an electric capacity 5 simultaneously, and amplifier then is made up of LM324.Amplifier 7 outputs connect frequency detection circuit 8.This circuit is made up of integrated circuit LM567, is connected to light-emitting diode 9,10 (or other warning device) on the 8th pin of testing circuit.

During use, the outside line ring, the operator on duty picks up telephone handle, from receiver, learn to seek who callee after, by operation paging system main frame 4, corresponding handset named leads to.Telephone handle 11 is placed on the connection support 1, makes the receiver of handle aim at the electromagnetic induction coil 2 that connects support 1 below; And make the receiver of handle aim at the loudspeaker 3 that connect support 1 below.At this moment, electromagnetic induction coil 2 is subjected to the influence in audio frequency magnetic field, the tone currents of inducting.Pass to handset, finish and talked about function by 4 controls of paging system main frame; The microphone of 3 alignment handle of loudspeaker can be finished the function of giving orders or instructions.The frequency detection circuit of being made up of LM567 is used for detecting the busy-back signal of 450Hz.When the outside line on-hook, transmit busy-back signal, a part of sidetone signal passes to two stage amplifer 6,7 and testing circuit 8 through electric capacity 5, after testing circuit 8 detects busy tone, Light-Emitting Diode 9,10 flashes, and prompting operator on duty conversation finishes, needs outside line cleaner handgrip 11 is resetted.

Claims (3)

1, the paging system phone connector comprises connection support and control circuit, control circuit comprises electromagnetic induction coil, loudspeaker, dual-stage amplifier, frequency detection circuit etc., it is characterized in that: described connection support (1) below correspondence is equipped with electromagnetic induction coil (2) and loudspeaker (3), one end of electromagnetic induction coil (2) and loudspeaker (3) and call equipment or other phonetic experiment equipment (4) join, the public land end of other end connecting circuit, loudspeaker (3) connect the dual-stage amplifier (6) that is connected in series by an electric capacity (5) simultaneously, (7), amplifier (7) output connects frequency detection circuit (8).

2, paging system phone connector according to claim 1 is characterized in that: be connected to warning devices (9,10) such as light-emitting diode on the 8th pin of testing circuit (8).

3, paging system phone connector according to claim 1 is characterized in that: the mounting distance that connects support (1) and electromagnetic induction coil (2) and loudspeaker (3) should be as far as possible little.