CN2324715Y - Colinear calling extension controlled by one-chip computer - Google Patents

Abstract

The utility model relates to a collinear calling extension machine controlled by a single chip microcomputer, which is composed of an extension machine shell and a control circuit which is arranged in an extension machine, wherein, the extension machine control circuit comprises a protective circuit, a double-audio reception circuit, a code identifying circuit, a conversion circuit, a ringing circuit and a communication circuit, wherein, the code identifying circuit is composed of a single-chip microcomputer and related software thereof. The utility model decodes and identifies the double-audio code transmitted by a main machine. When the external code coincides with the code of the machine, control signals are sent out, and the ringing circuit and the communication circuit are controlled to work. The control circuit has few components, simple circuit and reliable performance, and is convenient for application.

Description

Notify from a phone call handset by monolithic processor controlled conllinear

The utility model belongs to a kind of phone handset, relates to a kind of by monolithic processor controlled conllinear call handset.

It is very extensive to use a pair of circuit to carry out inner system applies scope of notifying from a phone call, and for example: all there is demand students' dormitory, dormitory, hotel and some other public arenas to this, and therefore many people only carry out the device of inner call with a pair of circuit in development.Comparatively simple method just is to use common double audio frequency (DTMF) telephone set (or change a social system a little it) as main frame, to mix power supply, designs a kind of special-purpose handset with decoder and ring speaking circuit again and gets final product.The decoding circuit of this handset often adopts the R-S trigger of chain structure, ordering with solve the repeated code that links to each other and all will take some measures, make circuit loaded down with trivial details, contact or components and parts have fault will influence acceptable effect or wrong number slightly in manufacturing, and the characteristics that conllinear is notified from a phone call, exactly every handset is required all very strictness, a handset is out of order, and will influence the normal operation of whole device.

The purpose of this utility model provides a kind ofly notifies from a phone call handset by monolithic processor controlled conllinear, can make that to notify from a phone call circuit simple, and can guarantee to notify from a phone call the normal operation of circuit.

For achieving the above object, the utility model is taked following design: notify from a phone call handset by monolithic processor controlled conllinear, it is made up of handset casing and the control circuit that is contained in the handset, the handset control circuit comprises six parts, be respectively protective circuit, double-tone receiving circuit frequently, know decoding circuit, change-over circuit, ringing circuit and speaking circuit; Guarantee that wherein the input of circuit connects the output of conllinear paging system main frame, the output of protective circuit is connected with the input pin of double-tone frequency receiving circuit and knowledge decoding circuit respectively; The double-tone data output end pin of receiving circuit frequently is connected with the data input pin of knowing decoding circuit; The output pin of knowing decoding circuit is connected with change-over circuit, and wherein a switching tube in the change-over circuit connects ringing circuit, and another switching tube then connects the conversation phone; Above-mentioned six partial circuits altogether.

Sign indicating number be decoded, be known to the utility model can with the double audio code that main frame transmits by being loaded on single-chip microcomputer and the interlock circuit thereof in the handset.When alien code is consistent with native code, send control signal, control ringing circuit and speaking circuit work.This control circuit uses that components and parts are few, circuit simple, dependable performance, be convenient to use.

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

Fig. 1 is circuit theory diagrams of the present utility model

Notify from a phone call handset by monolithic processor controlled conllinear, comprise handset and be contained in control circuit in the handset casing, this control circuit (as shown in Figure 1) comprises six parts, is respectively: the protective circuit of being made up of rectifier bridge W1; The double-tone of being made up of U1 (LMT8870) and related device thereof is receiving circuit frequently; The knowledge decoding circuit of forming by U2 (AT89C2051) single-chip microcomputer and corresponding software thereof; The change-over circuit of forming by cradle switch K1 and switching tube Q1, Q2; The ringing circuit of forming by musical film U3 (MX-01) and power amplifier U4 (LM386); The speaking circuit of forming by U5 (TEA1062) and related elements.

The input 1,2 of described protective circuit W1 connects the output of conllinear paging system main frame, the positive pole of this protective circuit is failed the connection of causing trouble and is known the input pin 20 of decoding circuit U2 and the input pin 2,3 of double-tone frequency receiving circuit U1, the data output end pin 11-15 of double-tone frequency receiving circuit U1 and the corresponding connection of data input pin 12-16 of knowledge decoding circuit U2; The output pin 17 of U2 is connected between base resistance R1, the R2 of switching tube Q1, Q2.Wherein the emitter of switching tube Q1 connects the b point of cradle switch K1, and its collector electrode connects ringing circuit; The emitter of switching tube Q2 connects the c point of cradle switch K1, and its collector electrode connects speaking circuit; The b point of cradle switch K1 links to each other with the pin 1 of knowing decoding circuit U2.

Above-mentioned six partial circuits altogether.

The operation principle of being notified from a phone call handset by monolithic processor controlled conllinear is as follows: the double audio code that double-tone frequency receiving circuit U1 sends main frame is translated into binary-coded decimal, when alien code is consistent with native code, cradle switch a, b are connected, after receiving control signal, switching tube Q1 conducting, then ringing circuit work and send ringing tone and ring; The handset off-hook, cradle switch a, c join, receive control signal after, switching tube Q2 conducting, speaking circuit work.

Be connected the single-chip microcomputer on the conllinear circuit, also can connect the circuit of other form, to control other electrical installation.

Claims (3)

1, a kind of by monolithic processor controlled conllinear call handset, it is made up of handset casing and the control circuit that is contained in the handset, the handset control circuit comprises six parts, is respectively protective circuit, double-tone receiving circuit frequently, knows decoding circuit, change-over circuit, ringing circuit and speaking circuit; It is characterized in that: the input of protective circuit connects the output of conllinear paging system main frame, and the output of protective circuit is connected with the input pin of double-tone frequency receiving circuit and knowledge decoding circuit respectively; The double-tone output pin of receiving circuit frequently is connected with the data input pin of knowing decoding circuit; The data output pin of knowing decoding circuit is connected with change-over circuit, and wherein a switching tube in the change-over circuit connects ringing circuit, and another switching tube then connects the conversation phone; Above-mentioned six partial circuits altogether.

2, according to claim 1 a kind of by monolithic processor controlled conllinear call handset, it is characterized in that: single-chip microcomputer and corresponding software thereof are formed the knowledge decoding circuit.

3, according to claim 1 a kind of by monolithic processor controlled conllinear call handset, it is characterized in that: be connected the single-chip microcomputer on the conllinear circuit, also can connect other electrical installation.

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