CN2182501Y - Telephone extension with multi-custom intercommunicating apparatus - Google Patents

Abstract

The utility model discloses a telephone extension with multi-custom intercommunicating apparatus, characterized in that a converting switch is used for realizing the switch connection among the communication lines, the signal output terminal of the oscillating circuit of the identification signal, and the signal input terminal of the frequency detection circuit. The communication line can transfer oscillation frequency signals and voice signals by time sharing. Communication bus with two cores are used for completing all signal transmission. The utility model has the advantages of simple structure, low cost price, and low manufacturing cost.

Description

Telephone extension with multi-custom intercommunicating apparatus

The utility model relates to a kind of extension that same circuit carries out multi-user's intercommunication that is overlapped in, and particularly relates to a kind of extension from a certain extension set frequency of oscillation to a plurality of other extension sets that are connected to same circuit that can select to send.

At present, the intercommunication that sell in market, generally only being suitable for two sides converses, because the extension set inside of this talkback unit does not have can be for the ring structure of identification, therefore, the dilatation meeting of this device extension set brings very big problem, makes the scheme of using a plurality of extension sets on same circuit, is difficult to be applied in practice.

The purpose of this utility model is to provide a kind of extension of multi-user's talkback unit, this extension can send or receive the frequency signal of selecting a certain extension set to bus, and the frequency signal that receives discerned, when the natural mode shape of the frequency signal that receives and extension set is consistent, extension set just sends ring, thereby reach extension set can be discerned.

The purpose of this utility model also is the extension that provided two order wire terminals only to be arranged.

Its purpose realizes like this: it comprises receiver, transmitter, amplifying circuit, ringing circuit, oscillating circuit, frequency detection circuit, change over switch and battery, wherein, oscillating circuit signal output part and feedback signal input are connected to the extension set coding circuit of natural mode shape of a plurality of available different extension sets and self coding circuit that determines the natural mode shape of self, be characterized in, one order wire terminals, the oscillating circuit signal output part, the frequency detection circuit signal input part forms the annexation that these order wire terminals connect oscillating circuit signal output part or frequency detection circuit signal input part convertiblely by one group of line end of above-mentioned change over switch, and self coding circuit of oscillating circuit then another group line end by change over switch constitutes and the relation that is connected or disconnects of oscillating circuit feedback signal input.

Fig. 1--Fig. 2 is a concrete structure circuit diagram of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing:

With reference to Fig. 1, wherein, amplifying circuit constitutes by amplifying integrated IC3, after its acceptance is amplified from the speech signal of telecommunication of bus and to it, signal is delivered to transmitter SP2 be reduced to sound, the input of this amplifying circuit and receiver is connected to the terminals of order wire, comprises the common terminals that directly are connected to order wire or is connected to the terminals of order wire indirectly, as be connected to change over switch K1-2 line end as shown in Figure 2; Oscillating circuit is used to other extension set of identification and can sends the natural mode shape corresponding with each extension set, frequency detection circuit is used to catch the frequency signal that belongs in the intrinsic center surge frequency range of local-oscillator circuit, in the present embodiment, the frequency that oscillating circuit and frequency detection circuit adopt the two the to be integrated in one integrated LM567 that decodes, this integrated if the 5th pin and the 6th pin indirectly on resistance R, and the 6th pin is through a capacitor C ground connection, just can constitute an oscillating circuit, wherein, the 5th pin is the signal output part of this oscillating circuit, the 6th pin is the feedback signal input, in addition, on above-mentioned basis,, drops on its 3rd pin by R as long as being connected a certain signal frequency, in the time of in the centre frequency scope that C determined, the 8th pin will become low level by original high level, promptly constitute a frequency detection circuit that can detect frequency simultaneously, wherein, the 3rd pin is this frequency detection circuit signal input part, and the 8th pin is this frequency detection circuit signal output part; The extension set coding circuit is made of resistance R x and button ANx, and the value of resistance R x should make the Cf of this extension set and the product of Rx equate substantially with the Rf product with the Cf of extension set X; Ringing circuit is made of the integrated IC2 of ring, and it is according to the frequency detection circuit signal output part, and the signal of promptly above-mentioned the 8th pin carries out ring.

Below for being connected to the course of work of a plurality of the utility model extension sets on the same circuit:

When extension set is in on-hook, change over switch K1-1 is connected to K1-3, and K2-1 is connected to K2-3, making the extension set frequency detection circuit is that capture range is caught the frequency signal that sends from bus at any time with the centre frequency by Cf and Rf decision, if carry machine, then change over switch K1-1 transfers in K1-2, K2-1 and K2-3 disconnect, for extension set is selected the corresponding natural frequency of other a certain extension set and sends this frequency to bus to prepare, as at this moment pressing the button ANx, then oscillating circuit signal output part B is by change over switch K1-2, K1-1 sends the oscillator signal that a frequency of oscillation is Rx and Cf decision to bus, if at this moment other extension set is in hook state, then oscillator signal is sent to the frequency detection circuit signal input part Q of each extension set, but have only the Cf of X extension set and the centre frequency scope of Rf decision can catch by the above-mentioned Rx of machine extension set and the frequency of oscillation of Cf decision carried, so at this moment have only the frequency detection circuit output low level of X extension set, this low level makes corresponding ringing circuit send bell ring, if the X extension set is also carried machine, either party speech signal of telecommunication is just delivered to the other side through communication bus and is amplified integrated IC3, sound through amplifying the rear drive transmitter, reach and realize conversation.

It is desirable to, the battery negative power end of extension set, amplifying circuit negative pole end, ringing circuit negative pole end constitute the annexation that this negative power end connects amplifying circuit negative pole end or ringing circuit negative pole end convertiblely by the 3rd group of line end of change over switch again in the such scheme, the extension set amplifying circuit power supply under this state that is in on-hook is cut off, thereby can reaches the waste of avoiding power supply.

Extension of the present utility model, owing to adopt said structure, make the branch function from a plurality of extension sets that are connected to same circuit, select a certain extension set, promptly have only selected extension set just to send bell ring, ring does not take place in all the other extension sets, be suitable as the extension of multi-user's talkback unit, simultaneously, realize that order wire is connected with the conversion of oscillating circuit signal output part with the frequency detection circuit signal input part owing to adopt change over switch, make order wire can realize that timesharing transmits oscillation frequency signal and voice signal, thereby only must there be two order wire terminals then can finish all signal transmission, have simple in structure, the advantage that the cost cost is low.

Claims (3)

1, a kind of extension of multi-user's talkback unit, comprise receiver, transmitter, amplifying circuit, ringing circuit, oscillating circuit, frequency detection circuit, change over switch and battery, wherein, oscillating circuit signal output part and feedback signal input are connected to the extension set coding circuit of natural mode shape of a plurality of available different extension sets and self coding circuit that determines the natural mode shape of self, it is characterized in that, one order wire terminals, the oscillating circuit signal output part, the frequency detection circuit signal input part forms the annexation that these order wire terminals connect oscillating circuit signal output part or frequency detection circuit signal input part convertiblely by one group of line end of above-mentioned change over switch, and self coding circuit of oscillating circuit then another group line end by change over switch constitutes and the relation that is connected or disconnects of oscillating circuit feedback signal input.

According to the extension of claim 1, it is characterized in that 2, described extension set coding circuit is a circuit that is formed by resistance and button serial connection.

3, according to the extension of claim 1 or 2, it is characterized in that the negative power end of battery, amplifying circuit negative pole end, ringing circuit negative pole end constitute the annexation that this negative power end connects amplifying circuit negative pole or ringing circuit negative pole end convertiblely by the 3rd group of line end of change over switch.

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