CN2166563Y - Anti-theft alarm for telephone - Google Patents

Abstract

The utility model provides a multi-function anti-theft alarm for a telephone, which has the advantages of convenient operation, flexible use and stable and reliable machine performance. The utility model comprises a control circuit, an automatic identification circuit, a solid recording circuit, a voice path circuit, an external interface circuit and a display circuit, wherein, the external interface circuit utilizes an infrared probe as an unattended operation switch. The utility model can automatically identify various signals of an exchange, and can optionally store two or more than two telephone numbers, and can optionally record and reproduce alarm language information. The utility model has the characteristics of uninterrupted power supply, strong self-checking function, etc.

Description

Anti-theft alarm for telephone

The utility model relates to a kind of antitheft telephone alarm with Control Technique of Microcomputer and the combination of phone transmission technology.

Present domestic warning device development is very fast, along with the updating and develop of control system, many novel alarming device, particularly telephone alarm device have occurred.And from existing apparatus, the shortcoming that existence in various degree is certain specifically mainly contains the problem of the following aspects:

1, the language message of recording playback warning randomly;

2, can only store single fixing telephone number;

3, generally do not discern the function of phone information accepting state, though have also dumb, instability.

4, the information under the alarm condition latchs badly, not directly perceived, causes to have no data available.

The purpose of this utility model is overcoming on the above-mentioned in-problem basis exactly, provides a kind of use flexible, easy and simple to handle, the novel anti-theft telephone alarm of reliable operation.

The utility model comprises solid recording circuit 3, speech channel circuit 4, display circuit 6, power circuit 7 is characterized in that, further comprises, automatically discern whether normally external interface circuit of external switch signal for one, its input and infrared ray, alarm switch links to each other, and output links to each other with control circuit 1 input; A busy tone of sending here in order to identification switch, the automatic identification circuit 2 of dialing sound and ring-back tone, its input links to each other with the simulation off-hook output of speech channel circuit 4, and its output links to each other with the input of control circuit 1; Control circuit in order to control warning overall process, the alarm signal that obtains from external interface circuit 5 is divided into three tunnel: one tunnel startup automatic identification circuit 2, speech channel circuit 4, automatic off-hook, signal tone and solid recording circuit 3 are declared in dialing, selectively alarm signal are sent by speech channel circuit 4; One the tunnel keeps alarm condition with display circuit 6; Another road starts external record equipment by external interface circuit 5, and then finishes the simulation off-hook, and alarm signal is sent in dialing, keeps alarm condition.

Operation principle of the present utility model is a (see figure 1): alarm switch, the variable frequency oscillator 5-1(that the make-and-break signal of infrared switch enters in the external interface circuit 5 sees that Fig. 6 back is analyzed in conjunction with concrete circuit), make and changed frequency signal and deliver in the control circuit 1 and analyze, it is disconnected to judge alarm signal or switching line, short-circuit signal, if switching line is disconnected, short-circuit signal then control circuit 1 is exported this machine alarm signal to buzzer, if the relay that alarm signal then starts in the telephone circuit circuit 4 makes it adhesive.At this moment disconnect user telephone set, this alarm is linked to each other with subscriber's telephone line, and control circuit 1 sends two kinds of signals, and one starts gamma camera by external interface circuit 5, videocorder and hand record equipment, it is second by starting the dialing system in the speech channel circuit 4.Implement automatic dialing, and judge the busy tone that switch provides by automatic identification circuit 2, the dialing sound, ringing tone signal, thus learn that the recipient is in " the line is busy " " unmanned " state, still pulls out logical state.When speech channel pull out logical after, control circuit 1 selectively sends alarm signal by speech channel circuit 4 with solid recording circuit 3, then when automatic identification circuit 2 is known the busy tone of getting in the speech channel circuit 4, playback stops, disconnect the relay contact in the speech channel circuit 4, subscribers feeder and alarm are disconnected, and switch on the telephone set, alarm keeps its warning dress state with display circuit 6 under the support of software simultaneously, till changing the state of alert over to after the artificial processing of process.

Because in above-mentioned alarm procedure, adopted Control Technique of Microcomputer and mechanics of communication, and the automatic startup of recording equipment and alarm signal by dialing and recognition system send and the continuous circulation of warning language is sent, the simple operation that this machine is reported to the police, accurately.Owing to adopted the charactron circuit to make the self check of alarm and the inspection under the alarm condition more convenient, especially in speech channel circuit 4, adopted telephone stores chip 5173, himself can store the alarm call number more than two, and can send warning message exactly by automatic identification circuit 2, efficient and accuracy rate have been improved greatly, can make the user select suitable alarm point at random, be suitable for subregion, with different levels type of alarm.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1: be total circuit control block diagram;

Fig. 2: be control circuit and display circuit figure;

Fig. 3: be the speech channel circuit diagram;

Fig. 4: be automatic identification circuit figure;

Fig. 5: be solid recording circuit figure;

Fig. 6: be external interface circuit figure;

The control circuit (see figure 2): wherein selected single-chip microcomputer IC1 for use, eight D-latch IC3, read-only memory IC2 has formed single-chip minimum system, and it exports six road signals and input two paths of signals.

Output signal: the one tunnel successively through latch IC4, four-way switch IC6, and the dialing chip IC 7 in the speech channel circuit 4, its groundwork is to send dial pulsing to outside line automatically; Two road IC1 (3) pin is through driver, and relay (J) is used to control the break-make of outside line; Three road IC1 (7) foot control system solid recording part sends the number of times of voice signal to outside line; Four the tunnel through latch IC5 to display circuit; Five the tunnel is the control signal that is gone out the alarm condition indicator light by IC1 (4), (5) human hair combing waste; Six the tunnel is that external interface circuit sends control video camera, vcr signal by IC1 process IC6.

Input signal: the one tunnel through alarm signal, the variable frequency oscillator 5-1 in the external interface circuit 5, and photoelectrical coupler enters IC1 (13) pin, mainly differentiates the external switch status signal; Two road automatic identification circuit outputs are linked IC1 (1) pin, mainly are the phone tone signal of judging on the telephone wire.

1-2 circuit in the control circuit 1 is that hardware watchdog prevents that mainly software is owing to the generation of disturbing the confusion phenomena that produces, when program is normally moved, the pin of IC1 is all the time to hardware watchdog output trigger impulse, because hardware watchdog is formed by weighing trigger, so its output is always low level, when program causes confusion, can not normally provide trigger impulse to the hardware watchdog device, therefore the hardware watchdog output makes the IC1 reset routine restart normal operation to positive pulse of IC1 (9) pin output.

Display circuit (seeing line map in Fig. 2 frame of broken lines) has adopted seven-segment decoder IC18 charactron 6-1, the telephone number when main display alarm state or self check.

The control circuit groundwork is to form a connecting link.External various information vias are handled the back and are given an order to relevant circuit, make it to reach the alarm overall process.

Number system of sending out in the speech channel circuit (see figure 3) is by telephone stores chip (5173) and matrix switch (CD4066, CD22100), keyboard is formed, can artificially arbitrarily store two above alarm call numbers, IC7 is the chip with band memory function, it can store ten telephone numbers, utilize keyboard stochastic storing telephone number, utilize the dialing matrix circuit of IC6 when sending out number, solved the problem of the telephone number of the indeterminable stochastic storing of domestic like product more than two or two preferably as this chip.

The automatic identification circuit (see figure 4) comprises by band pass filter, and photoelectric coupling circuit can weigh equifrequency signal searcher and amplifier that trigger is formed, the audio signal decoder.Band pass filter is made up of low-pass filtering and high-pass filtering, main devices is integrated operational amplifier circuit IC9LM324, its effect is that filtering is greater than 500HZ, less than the AC signal of 300HZ frequency, carry out shaping filter through photoelectric coupling circuit and enter and to weigh (1) pin that trigger IC12 arrives IC1 at last.Another road amplifier IC10(3) the pin signal is gone into (1) pin signal and is outputed to tone decoder IC11, and the IC11 absorption point is as two kinds, and a kind of is 400HZ, and another kind is 450HZ, and this just decides according to the switch type is different.The purposes of two kinds of signals is the same, institute's difference be crosspoint switch and stored-program control exchange, in general mostly crosspoint switch is the signal that square-wave generator generates, and stored-program control exchange (more than 40) is a sine wave signal, but their common ground is the dialing sound, busy tone, the ring-back tone make-and-break time is the same basically, the mode of having selected for use soft or hard to take into account according to individual this characteristic the utility model, solved the assimilation effect of telephone signal tone well, thereby correctly parse the dialing sound, busy tone, ring-back tone.

The solid recording circuit (see figure 5) has been selected current state-of-the-art solid speech recording and reproducing circuit cleverly for use, and its operation principle is omitted, and that unique is IC13(2) pin directly links (4) pin of IC1, IC13(16) pin is to IC1(7) pin carries out playback control.Record button is to be directly connected on the panel, thereby reaches the purpose of recording playback language at random.

External interface circuit (see figure 6): when external interface touch switch or the signal of infrared scanner enter the capacity that the oscillator 5-1(that is made of time-base circuit IC17 and peripheral cell increases oscillating capacitance), (3) pin output frequency of IC17 is changed, through long line transmission, the photoelectric coupling shaping enters IC1(13) pin, comparing analysis through mini system is external interface signals or infrared scan signal.During, short circuit disconnected for long line transmission line, IC1 can not obtain IC17(3) signal of pin output, the report to the police staff of announcement of this machine removes fault.

The whole components and parts of the utility model are installed on the printed on both sides wiring board, the suitable shape that profile can adopt iron plate or injection moulding and similar material to make, there are a wicket and lockable in its outside, and any switch all sealing directly is responsible for control and operation by the person in charge in the enclosure.Telephone wire, switching line, infrared line scanner, the line of control camera is placed on the 16 pins socket with lock.

The utility model is assembled into the continuous operation that antitheft telephone alarm had 24 hours through aforesaid way, and the advantage of people or nobody two kinds of working methods can be arranged, and it has adopted the soft or hard combination, makes it simple to operate, makes tool flexible.Because it has utilized microcomputer technology, the software and hardware engineering is suitable, is suitable for producing in enormous quantities and applying.

Embodiment described above only is a kind of execution mode of the present utility model, and its protection range should be as the criterion with claim, and the qualification among the embodiment can not be as the restriction to the utility model protection scope.

Claims (4)

1, a kind of antitheft telephone alarm that utilizes circuit transmission, it comprises solid recording circuit (3); Speech channel circuit (4); Display circuit (6); Power circuit (7) is characterized in that, further comprises;

Whether automatic identification switch signal normal external interface circuit (5), its input and infrared ray, and alarm switch links to each other, and output links to each other with control circuit (1) input;

A busy tone of sending here in order to identification switch, the automatic identification circuit of dialing sound and ring-back tone (2), its input links to each other with the simulation off-hook output of phone circuit (4), and its output links to each other with the input of control circuit (1);

Control circuit in order to control warning overall process, divide start automatic identification circuit (2) at three the tunnel: the one tunnel from the alarm signal that external interface circuit (5) obtains, speech channel circuit (4), automatic off-hook, dialing, declare signal tone and solid recording circuit (3), selectively alarm signal is sent by speech channel (4); One the tunnel keeps alarm condition with display circuit (6); Another road starts external record equipment by external interface circuit (5), and then finishes the simulation off-hook, and alarm signal is sent in dialing, keeps alarm condition;

2, according to the described antitheft telephone alarm of claim 1, it is characterized in that number system of sending out in the speech channel part is by telephone stores chip (5173) and matrix switch (CD4066, CD22100) keyboard is formed, and can artificially arbitrarily store plural alarm call number.

3,, it is characterized in that the oscillator in the external interface circuit (5) is formed by time-base circuit IC7 and to enclosing components and parts according to the described antitheft telephone alarm of claim 1.

4,, it is characterized in that forming by audio signal decoder and equifrequency signal searcher in the automatic identification circuit (2) according to the described antitheft telephone alarm of claim 1.

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