CN2329123Y

CN2329123Y - Anti-frandulent use of telephone and cipher limiting dialing and automatic dialing alarm

Info

Publication number: CN2329123Y
Application number: CN 97214389
Authority: CN
Inventors: 李稚寅
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-05
Filing date: 1997-05-05
Publication date: 1999-07-14
Anticipated expiration: 2007-05-05

Abstract

The utility model relates to an anti-theft automatic dialing alarm for limiting dialing with ciphers for a telephone, belonging to the technical field of communication circuits, and composed of a single-chip computer PIC16C57 system circuit, a code detecting sending circuit M1 for dual-audio signals, an anti-theft circuit for limiting dialing, and an acoustic-optic alarm circuit A1 and an alarm sensor circuit S1. The utility model is connected in series between the telephone and a voice circuit of an outside line. When an unauthorized user uses the telephone, the anti-theft automatic dialing alarm can efficiently limit the dialing. When the telephone is stolen, or when sensors for protecting theft, fire and gas receive alarm signals, the utility model can send out audible and visual alarms and automatically call predetermined phone numbers or a BP machine. Thus, the utility model is suitable for enterprises, institutions and residential buildings.

Description

Phone anti-frandulent use and password limit are dialled and the automatic dialing alarm device

The utility model relates to a kind of phone anti-frandulent use and the password limit is dialled and the automatic dialing alarm device.Belong to the telecommunication circuit technical field.

Existing automatic dialing alarm device does not possess the phone anti-frandulent use and the password limit is dialled function; And existing phone anti-frandulent use and password dialing limiter do not possess the automatic dialing alarm function yet.

The purpose of this utility model is only to use a slice PIC16C57 single-chip microcomputer just can realize simultaneously that phone anti-frandulent use and password limit dials and the automatic dialing alarm function.

Technical solution of the present utility model is as follows:

It is characterized in that described device is to be serially connected between telephone set and the outside line speech channel.It comprises a PIC16C57 single-chip microcomputer IC1 and the EEPROM24LC01 data storage IC2 that directly links with IC1; Double-audio signal is detectd yard signaling circuit M1 and phone anti-frandulent use and limit and is dialled circuit; Also can comprise sound light alarming circuit A1 and alert sensor circuit S1.During standby, this device is battery-powered; During work,, make outside line speech channel voltage through polar protective circuit B1 by single-chip microcomputer IC1 control optocoupler O2 conducting, optocoupler O2, resistance R 6 after diode Z1 voltage stabilizing, is irritated diode D2 through counnter attack again, and resistance R 7 is powered to IC1.Stolen group outside line voltage signal is behind B1 in reflection outside line speech channel, and by resistance R 4, R5 divides a port RB7 who is sent to IC1.The port RB4 of IC1 and emitter one end of optocoupler O1 link to detect whether off-hook of user.The port RB3 of IC1 and be serially connected in telephone set and the outside line speech channel between the base stage of triode TG1 link with the break-make of control TG1, thereby realize that limit dials function.The port RB2 of IC1 and the base stage of triode TG2 link with the break-make of control TG2.During the TG2 conducting, can realize simulating off-hook.Be connected to capacitor C 1 between an input L1 of this device and an output TEL1; Be connected to capacitor C 2 between another input L2 and another output TEL2, so that the bell signal path to be provided.

Double-audio signal is detectd yard signaling circuit M1 and is detectd decoding circuit IC3 and UMC91531 signaling IC circuit 4 by MC145436, and capacitor C 21 and crystal oscillator CRY2 form.The 13rd pin of IC3, respectively corresponding the 8th pin with IC4 of the 14th pin, the 1st pin, the 2nd pin, the 7th pin, the 6th pin, the 5th pin link and simultaneously respectively with the 9th pin of IC1, the 8th pin, the 7th pin, the 6th pin links.Realize time-sharing multiplex by software control.Thereby only make and control whole device with regard to enough ports are arranged with a slice IC1.

The utility model has the advantages that: 1). only use a slice PIC16C57 single-chip microcomputer just can realize that phone anti-frandulent use and password limit dials and the automatic dialing alarm function.Circuit is simple, and cost is low.2). use powered battery.The electric current that sample circuit takes out from the telephone line power supply is not more than 5 microamperes; Thereby satisfy 3.2 requirements of GB9032_88 and GB9031_88.Telephone line is had no adverse effects.

Below in conjunction with accompanying drawing technical solution of the present utility model is elaborated:

When single-chip microcomputer detects RB7 is that electronegative potential and RB6 are stolen group of phone during for high potential; At this moment automatic dial-up circuit is worked immediately, transfers to the warning number fast, notifies owner.It is then occupied because of circuit to steal group person, can't put through number, the on-hook of having to.When steal dialling the person once more during off-hook, will repeat above step.

When single-chip microcomputer detects RB7 is that electronegative potential and RB6 are telephone wire during also for electronegative potential and are cut off.At this moment, single-chip microcomputer will start sound light alarming circuit immediately.

When single-chip microcomputer when to detect RB4 be high, be user's off-hook.At this moment, RB5 is output as height, and double-audio signal is detectd decoding circuit IC3 and got electric work.Check whether the number that the user transfers to is dail-limiting number.In this way, then RB3 is output as low.TG1 ends, and the disconnect user phone connects with the outside line speech channel.The time that disconnects is by software set.

When single-chip microcomputer from RC0, when RC1, RC2 and RC3 detected the signal that alarm sensor transmits, RB2 was output as high potential.Make the TG2 conducting, the simulation off-hook.Then, start double-audio signal signaling circuit and sound light alarming circuit.

Telephone number and password all leave among the IC2.IC2 is eeprom chip 24LC01.Be not afraid of power down.

Password input and modification; Dail-limiting number; The warning number; The order of setting up defences and withdraw a garrison is all imported from telephone key.Detect the decoding circuit decoding by double-audio signal; Then by software processes.

Claims

1. phone anti-frandulent use and password limit is dialled and the automatic dialing alarm device, it is characterized in that described device is to be serially connected between telephone set and the outside line speech channel.It comprises a PIC16C57 single-chip microcomputer IC1 and the data storage IC2 that directly links with IC1; Double-audio signal detects yard signaling circuit M1 and the phone limit is dialled circuit TG1; Also can comprise sound light alarming circuit A1 and alert sensor circuit S1.

(1). during standby, this device is battery-powered.

(2). during work, outside line speech channel voltage is through polar protective circuit B1, optocoupler O2, resistance R 6, diode D2, resistance R 7 is powered to IC1.

(3). the outside line voltage signal is behind B1, and by resistance R 4, R5 divides a port RB7 who is sent to IC1.

(4) emitter one end of .IC1 port RB4 and optocoupler O1 links.

(5) base stage of .IC1 port RB3 and triode TG1 links.

(6) base stage of .IC1 port RB2 and triode TG2 links.

(7). be connected to capacitor C 1 between an input L1 of this device and an output TEL1; Be connected to capacitor C 2 between another input L2 and another output TEL2.

2. phone anti-frandulent use according to claim 1 and password limit are dialled and the automatic dialing alarm device, it is characterized in that double-audio signal detects yard signaling circuit M1 and detect decoding circuit IC3 and UMC91531 signaling IC circuit 4 by MC145436, capacitor C 21 and crystal oscillator CRY2 form.The 13rd pin of IC3, respectively corresponding the 8th pin with IC4 of the 14th pin, the 1st pin, the 2nd pin, the 7th pin, the 6th pin, the 5th pin link and simultaneously respectively with the 9th pin of IC1, the 8th pin, the 7th pin, the 6th pin links.