CN2223540Y - Alarm monitor for telephone - Google Patents

Abstract

The utility model relates to an alarm monitor for a telephone, which is a special purpose monitoring device matched with a double-tone automatic digital signal alarm telephone. The alarm monitor for a telephone is mainly composed of an automatic answering circuit for a telephone and a double-tone signal decoding circuit for a telephone. Moreover, the system support of an 8031 SCM microcomputer is obtained. The alarm monitor for a telephone can also comprise an acoustic-optic alarm circuit which is connected to the subscriber line of the local telephone. When once the alarm signal from the double-tone alarm telephone is received, the warning message can be automatically displayed and printed, and an alarm signal is dispatched. The alarm monitor for a telephone is especially suitable for the independent alarm systems in the community or the industrial and mining enterprises and units.

Description

The telephone call monitor

The utility model relates to a kind of telephone call monitor, is a kind of center alarm receiver that utilizes the telephone communication transmission line.

Utilize subscriber phone to realize that the technical scheme of reporting to the police automatically is existing a plurality of at present, they rely on the support of the professional center warning receiving system of telephone office or public security department mostly during use, are difficult to promote the use of in community or business unit.The other alarm call is a phonetic alarm device, though lower to receiving system requirements, promptly quite connect phone No. one time, be difficult to realize the automatic supervision of warning system.In the patent application of the key name that the applicant proposes at the same time for " digital signal alarm telephone set automatically ", disclose a kind of telecommunications office " 12 7 " platform that utilizes and carried out the phone that digital signal is reported to the police, this alarm call has adopted the double-tone communication technology frequently, still lacks enough reception surveillance technical support backgrounds.

The purpose of this utility model is to monitor receiver for double-tone frequency word signal alarm phone provides a kind of automatic warning.

Task of the present utility model is achieved in that a receiving system that is connected with local user's line comprises:

Microcomputer holding componentss such as one 8031 single-chip microcomputer and program storage keyboard, display interface circuit, clock module and keyboard, demonstration, printer, power supply;

A local telephone communication interface circuit, form by local telephone network ring automatic-answering back device circuit and double-tone frequency decoding circuit, ring automatic-answering back device circuit will be taken from the bell signal of city's circuit and handle through rectifier D and switching tube G1, add to the CLK end of a trigger M17, the output of this trigger, one the road delivers to the drive circuit of relay J, a data port of described 8031 is delivered on another road, the contact switch JK control local line ZJX of this relay J is overturn to decoding circuit by described answering circuit, the double-audio signal that described double-tone frequency decoding circuit will be taken from local line ZJX is coupled through transformer B1, deliver to double-tone coding chip M10 frequently, the binary system delivery outlet Q of this chip M10 is connected with one group of data port of described single-chip microcomputer 8031.

One as automatic function for monitoring is replenished, and this device can also comprise a sound light alarming circuit that is connected with 8031 single-chip microcomputers, and it is reported to the police and triggers a switching value control that sends by 8031.

This automatic alarm monitor can utilize existing local network and the relevant supporting composition telephone alarm system of double-tone frequency automatically alarming telephone set, can show and print the two-stage dialing information that alarm telephone set is sent here, number as the alerts user phone, Yue Ding alarm code and time of fire alarming voluntarily, in the zone that " 127 " platform is opened, can be used as multi-functional automatic monitoring device uses, in the zone that " 127 " platform is not opened, receive and directly support the frequently automatic digital signal alarm telephone set of double-tone, the independent warning system of particularly suitable community and business unit

With regard to drawings and Examples, the utility model is specified below:

Fig. 1 is this principle of device block diagram

Fig. 2 is communication interface circuit and sound light alarming circuit schematic diagram.

8031 single-chip microcomputer M1 and support circuit M2-M9 thereof and printer μ A-16A, keyboard JB, nixie display SM constitute a computer management system together among Fig. 1, wherein latch M2, M9 are 74LS373, procedure stores chip M3 is 2764, interface chip M4 is 8279, MS is 74LS138 in the drive circuit of nixie display SM, and M7 and M9 are MC1413.Clock chip M6 is MSM5832, and its A mouth is connected with the delivery outlet Q of latch M9, and the D mouth is connected with data/address bus D BUS, provides to report to the police constantly when reporting to the police, at ordinary times as the clock information source.8031 singlechips are the tape program memory not, so establish procedure stores chip M3.Address bus A BUS takes out from 8031 PO mouth and P2 mouth, and wherein the PO mouth is the address date time-sharing multiplex.The input of communication interface circuit TJ is connected with local network ZLX, and the output of its binary digit is connected with 8031 P1 mouth, and this circuit is also to switching signal that obtains ring of serial port RXD conveying of 8031, and accepts the reset signal that 8031 P1 mouth is beamed back.Sound light alarming circuit BJ obtains a warning triggering signal from 8031 P2 mouth.

Among Fig. 2, ZJX connects local telephone, and the circuit that normal-closed end by relay contact JK and electric capacity, rectifier bridge D etc. form presents high resistant to local telephone, is equivalent to phone on-hook state.When automatically alarming telephone set is put through this local telephone of ZJX and ring, bell signal is sent into full-wave rectifier D through the normal-closed end of relay contact JK, through rectification, after filtering and the voltage stabilizing, base stage at switching tube G1 forms positive voltage, about 0.7V, make the G1 conducting, the collector electrode output low level signal of G1 is to 13 pin of inverter, and 12 pin output high level is to the CLK end of trigger M13 (4013), and the output Q of M17 becomes the base stage that high level is delivered to triode G2 by low level, make the G2 conducting, drive relay J, make contact JK action, the elementary of transformer B1 jumps on the local telephone ZJX line, the state that is presented is equivalent to phone " off-hook ", and bell signal stops immediately.Another output Q of trigger M17 delivers to a low level signal at the RXD end of single-chip microcomputer 8031 simultaneously, notify 8031 to prepare to receive code signal that automatically alarming telephone set is sent out, the P26 end output delegation level signal of this moment 8031 is through the anti-phase high level that is shaped as, 9 pin are gone into, and 8 pin go out, and one the road delivers to 2 pin of language integrated circuit SR8808, make it to start working, the voice signal of output drives loud speaker YSQ work after power amplifier LM386 amplifies, finish acoustic alarm.6 pin of oscillator M14 are delivered on another road, 3 open circuit and oscillator work that NAND gate is formed among the M14, after G3 amplifies, driven for emitting lights diode D2 work, the circuit that the flicker frequency of D2 is made up of 1,2,3 pin of pin among the M14 and resistance capacitance is determined, reports to the police thereby finish light.Subsequently, the password that automatically alarming telephone set sent is coupled through transformer B1, the electric capacity stopping direct current, resistor network decay balance, deliver to double-audio signal and receive decoding special chip M10 (MT8870), MT8870 carries out high and low stopband filtering to the frequent coded signal of double-tone, amplitude limit, frequency detecting and affirmation, decipher, latch back output, its delivery outlet Q0～Q3 is input to binary digital signal in P10～P13 mouth of 8031, the frequent sign indicating number of double-tone of every reception is just to binary signal of 8031 outputs, thereby finishes the input and the demodulation work of alarm cipher.Trigger M17 also holds to R from reset signal of P16 mouth acquisition of 8031, and after above-mentioned work was finished, reset enable signal trigger M17 resetted, relay J is recovered reset condition, local telephone ZJX disconnects with transformer B1, receives again on the rectifier bridge, is equivalent to the phone on-hook.So far the telephone call monitor is handled a group alarm signal, waits for the arrival of next group alarm signal.

Claims (2)

1, a kind of telephone call monitor is characterized in that described monitor comprises:

1 8031 single-chip microcomputer M1 and support program memory M3, interface chip M4, clock module M6 and keyboard JB, printer μ P-16A, display SM, power supply;

A local telephone communication interface circuit, form by local telephone network ring automatic-answering back device circuit and double-tone frequency decoding circuit, ring automatic-answering back device circuit will be taken from the bell signal of city's circuit and handle through rectifier D and switching tube G1, add to the CLK end of a trigger M17, the output of this trigger, one the road delivers to the drive circuit of relay J, a data port of described 8031 is delivered on another road, the contact switch JK control local line ZJX of this relay J is overturn to decoding circuit by described answering circuit, the double-audio signal that described double-tone frequency decoding circuit will be taken from local line ZJX is coupled through transformer B1, deliver to double-tone coding chip M10 frequently, the binary system delivery outlet Q of this chip M10 is connected with one group of data port of described single-chip microcomputer 8031.

2, telephone call monitor according to claim 1 is characterized in that described monitor also comprises a sound light alarming circuit that is connected with single-chip microcomputer 8031, and it is reported to the police and triggers a switching signal control that is sent by described 8031 single-chip microcomputers.

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