CN2279038Y - Intelligent connector box for preventing fraudulent calling - Google Patents

Abstract

The utility model relates to an intelligent connecting box for preventing telephone embezzlement, composed of a voltage detecting circuit (1) for an outside line, a host identifying circuit (2), a power supply control circuit (3), a dual-audio identifying circuit (4), a delay circuit (5), and a line mixing and display circuit (6). When the outside line is provided with an embezzling telephone which is picked up, the voltage detecting circuit for the outside line outputs high level signals to trigger the power supply control circuit to power on the dual-audio identifying circuit for working. At the moment, any telephone numbers pressed on the embezzling telephone can be identified and decoded by the dual-audio identifying circuit, and simultaneously the delay circuit and the line mixing and display circuit are triggered to cause serious line mixture in the outside line, so that the other party's telephone can not be dialed through to reliably reach the goal of preventing embezzlement.

Description

The antitheft terminal box of smart phone

The utility model relates to a kind of anti-theft device, especially can discern the antitheft terminal box of the smart phone of double-audio signal in the outside line.

At present, whether the antitheft terminal box of known phone is to adopt the variation of voltage in the circuit to judge in the circuit stolen, when usurping telephone set and incorporate outside line into, utilize off-hook and on-hook voltage to change and judge whether circuit is stolen, then circuit is caused swinging cross or audio disturbances, make usurp telephone set and can not dial number or connect the other side's phone after, audio disturbances can't not heard the other side's speech.But post and telecommunications office's measuring chamber all will be taken a sample test local line every day, and method of measurement is that circuit is carried out charge and discharge process twice, utilizes computer to judge whether automatically normally.Because the change in voltage scope that discharges and recharges is bigger, makes antitheft terminal box think that circuit is stolen by mistake, causes serious swinging cross of measurement result or line capacitance bigger, computation error is judged, influenced the operate as normal of measuring chamber.

The purpose of this utility model is to have overcome above-mentioned the deficiencies in the prior art, and a kind of double-audio signal in the identification circuit that utilizes is provided, and judges whether the smart phone terminal box that circuit is stolen.

The purpose of this utility model is achieved in that identification circuit, delay circuit, swinging cross and display circuit are formed frequently by outside line voltage detecting circuit, main frame identification circuit, power control circuit, double-tone for it.Terminals (A) link to each other with the outside line positive terminal, terminals (B) link to each other with the outside line negative pole end, terminals (C, D) link to each other with owner's telephone set, resistance (R1, R2) end links to each other with triode (T1) base stage, the other end respectively with terminals (A, B) link to each other, resistance (R3) and triode (T1, T2) collector electrode, inverter (IC1:N1) input links to each other, triode (T1, T2) emitter links to each other with terminals (B), after phone and off-hook are usurped in outside line, terminals (A, B) both end voltage is reduced to 8V by 50V, through resistance (R1, R2) after the dividing potential drop, triode (T1) base voltage is reduced to 0.28V by 1.76V, then triode (T1) ends, inverter (IC1:N1) input becomes high level by low level, inverter (IC1:N2, N3) output also is a high level, for double-tone frequency decoding integrated circuit (IC2) provides working power, if usurp telephone set by any telephone number, all can be by double-tone decoding integrated circuit (IC2) identification frequently decoding, and respectively by the 11st～14 pin output high level, the process diode (D2～D5), electric capacity (C4), resistance (R8), diode (D6), trigger inverter (IC1:N4), inverter (IC1:N5 then, N6) output output high level, and link to each other with triode (T3) base stage, make triode (T3) saturation conduction, demonstration diode (D7) is lighted, cause the serious swinging cross of outside line, make and usurp telephone set and can't connect the other side's phone, thereby reach antitheft purpose reliably.And swinging cross and display circuit, make outside line cause serious swinging cross, can't connect the other side's phone thereby usurp telephone set, reach antitheft purpose reliably.

The antitheft terminal box of the utility model smart phone has adopted special-purpose double-tone identification circuit and little power consumption cmos digital integrated circuit frequently, does not need that the debugging welding is errorless can to reach designing requirement.

Owing to adopt such scheme, solved circuit swinging cross and the big problem of line capacitance that post and telecommunications office's measuring chamber false judgment causes.The utlity model has little, the little power consumption of volume, reliability height, advantage that cost is low.

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model circuit theory diagrams.

In Fig. 1, outside line voltage detecting circuit (1) is made of resistance (R1, R2, R3), triode (T1).Main frame identification circuit (2) is made of resistance (R10), triode (T2).Power control circuit (3) is made of inverter (IC1:N1, N2, N3), electric capacity (C1).Double-tone is identification circuit (4) frequently, is made of electric capacity (C2), resistance (R4), voltage stabilizing didoe (D1), double-tone frequency decoding integrated circuit (IC2) and peripheral cell.Delay circuit (5) is made of electric capacity (C4), resistance (R8), diode (D6), inverter (IC1:N4, N5, N6).Swinging cross and display circuit (5), by light-emitting diode (D7), triode (T3) constitutes.After phone and off-hook are usurped in outside line, by outside line voltage detecting circuit (1), detected voltage change signal, trigger power control circuit (3), offer double-tone identification circuit (4) working power frequently by power control circuit (3), at this moment if usurp telephone set by any telephone number, all can be discerned decoding by double-tone frequency identification circuit (4), and output high level signal, trigger delay circuit (5), reach swinging cross and display circuit (6), cause the serious swinging cross of outside line, make and usurp telephone set and can't put through the other side's phone, thereby reach antitheft purpose reliably.

In Fig. 2, terminals (A) link to each other with the outside line positive terminal, terminals (B) link to each other with the outside line negative pole end, terminals (C, D) two ends link to each other with owner's telephone set, resistance (R1, a R2) end links to each other with triode (T1) base stage, the other end links to each other with terminals (A, B) respectively, and resistance (R3) links to each other with triode (T1, T2) collector electrode, inverter (IC1:N1) input, and triode (T1, T2) emitter links to each other with terminals (B).When phone or hook state are not usurped in outside line, terminals (A, B) both end voltage is 50V, after resistance (R1, R2) dividing potential drop, triode (T1) base voltage is 1.76V, make triode (T1) saturation conduction, inverter (IC1:N1) input is a low level, and inverter (IC1:N2, N3) output also is a low level, then double-tone frequently decoding integrated circuit (IC2:TC8870) can not get operating voltage and do not work.

When owner's phone off-hook, the ordinary telephone set working direct current is 30mA, then resistance (R10) both end voltage is 0.9V, resistance (R10) end links to each other with triode (T2) base stage, make triode (T2) saturation conduction, inverter (IC1:N1) input is a low level, and then inverter (IC1:N2, N3) output also is a low level, double-tone frequency decoding integrated circuit (IC2:TC8870) can not get operating voltage and does not work, but then owner's telephone set normal dialing conversation.

After phone and off-hook are usurped in outside line, terminals (A, B) both end voltage is reduced to 8V by 50V, and after resistance (R1, R2) dividing potential drop, triode (T1) base voltage is reduced to 0.28V by 1.76V, triode (T1) ends, and inverter (IC1:N1) input becomes high level by low level.Inverter (IC1:N2 then, N3) output also is a high level, for double-tone frequency decoding integrated circuit (IC2:TC8870) provides working power, at this moment if usurp telephone set by any telephone number, through electric capacity (C2), resistance (R4) is sent into double-tone decoding integrated circuit (IC2:TC8870) the 2nd pin frequently, through double-tone decoding integrated circuit (IC2:TC8870) identification frequently decoding, and respectively by the 11st～14 pin output high level, the process diode (D2～D5), delay capacitor (C4), resistance (R8), diode (D6), trigger then inverter (IC1:N5 of inverter (IC1:N4), N6) output output high level, and link to each other with triode (T3) base stage, make triode (T3) saturation conduction, demonstration diode (D7) is lighted, cause the serious swinging cross of outside line, make and usurp telephone set and can't put through the other side's phone, simultaneously by electric capacity (C4), the delay circuit that resistance (R8) is formed is with the swinging cross state delay after 2 seconds, automatically recover the outside line normal condition, thereby reach antitheft purpose reliably.

Claims (3)

1, the antitheft terminal box of a kind of smart phone, it is by the outside line voltage detecting circuit, the main frame identification circuit, power control circuit, double-tone is identification circuit frequently, delay circuit, swinging cross and display circuit are formed, it is characterized in that: terminals (A) link to each other with the outside line positive terminal, terminals (B) link to each other with the outside line negative pole end, terminals (C, D) link to each other with owner's telephone set, resistance (R1, R2) end links to each other with triode (T1) base stage, the other end respectively with terminals (A, B) link to each other, resistance (R3) and triode (T1, T2) collector electrode, inverter (IC1:N1) input links to each other, triode (T1, T2) emitter links to each other with terminals (B), after phone and off-hook are usurped in outside line, terminals (A, B) both end voltage is reduced to 8V by 50V, through resistance (R1, R2) after the dividing potential drop, triode (T1) base voltage is reduced to 0.28V by 1.76V, then triode (T1) ends, inverter (IC1:N1) input becomes high level by low level, inverter (IC1:N2, N3) output also is a high level, for double-tone frequency decoding integrated circuit (IC2) provides working power, if usurp telephone set by any telephone number, all can be by double-tone decoding integrated circuit (IC2) identification frequently decoding, and respectively by the 11st～14 pin output high level, the process diode (D2～D5), electric capacity (C4), resistance (R8), diode (D6), trigger inverter (IC1:N4), inverter (IC1:N5 then, N6) output output high level, and link to each other with triode (T3) base stage, make triode (T3) saturation conduction, demonstration diode (D7) is lighted, cause the serious swinging cross of outside line, make and usurp telephone set and can't connect the other side's phone, thereby reach antitheft purpose reliably.

2, smart phone terminal box according to claim 1, it is characterized in that: what power control circuit adopted is little power consumption cmos digital integrated circuit (IC1:CD4069), when telephone set is usurped in outside line, directly link to each other by inverter (IC1:N2, N3) output, and working power is provided with double-tone frequency decoding integrated circuit (IC2) the 18th pin.

3, smart phone terminal box according to claim 1, it is characterized in that: that double-tone frequency decoding integrated circuit adopts is application-specific integrated circuit (ASIC) (IC2:TC8870), crystal oscillator (J) links to each other with the 7th, 8 pin, resistance (R7) links to each other with the 10th, 15 pin, resistance (R6) links to each other with the 16th, 17 pin, electric capacity (C3) links to each other with the 17th, 18 pin, and resistance (R5) links to each other with the 2nd, 3 pin, and (D2～D5) positive pole links to each other with output the 11st～15 pin respectively diode.

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