CN2256611Y - Alarm for fraudulent use of telephone - Google Patents
Alarm for fraudulent use of telephone Download PDFInfo
- Publication number
- CN2256611Y CN2256611Y CN 95220654 CN95220654U CN2256611Y CN 2256611 Y CN2256611 Y CN 2256611Y CN 95220654 CN95220654 CN 95220654 CN 95220654 U CN95220654 U CN 95220654U CN 2256611 Y CN2256611 Y CN 2256611Y
- Authority
- CN
- China
- Prior art keywords
- unit
- resistance
- alarm
- hook
- phone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Telephone Function (AREA)
Abstract
The utility model discloses a phone anti-theft alarm comprising a line voltage detecting unit 1, a legal off-hook detecting unit 2, a control unit 2, an anti-theft alarm unit 4 and an auxiliary on-hook unit 5, wherein, the control unit 3 receives output signals from the line voltage detecting unit and the legal off-hook detecting unit 2 and outputs control signals to the anti-theft alarm unit 4 and the auxiliary on-hook unit 5 whose one end is connected with the anti-theft alarm unit 4. The utility model has high reliability and high stability at the anti-theft aspect of stolen connection and telephone embezzlement, and eliminates or reduces economic loss for legal users.
Description
The utility model relates to the phone servicing unit, is specifically related to prevent the equipment of fraudulent use of telephone, more particularly, relates to a kind of warning device of preventing that telephone line is stolen of being used to.
Now existingly multiplely be used for the antitheft and anti-key device for tone frequencies of phone, but one or several problem below mostly existing: 1) the attenuation equivalent index of D.C. resistance is excessive; 2) quiescent current is excessive, and the product that has reaches a milliampere level, even bigger; 3) anti-theft feature can not be taken into account audio frequency, two kinds of dialing forms of pulse; 4) can not prevent that key from listening; 5) can not automatic hand-up after reporting to the police, need the hand-reset can on-hook, go out then may report to the police as the user always; 6) adopt mechanical switching device, it is unreliable to work.
The purpose of this utility model is to provide a kind of phone the anti-alarm of usurping, this phone prevents usurping the shortcoming that alarm can overcome prior art, can be connected with lower D.C. resistance in the speech channel so that the speech channel decay is minimum, thereby and need not the outside line polarity discriminating on being connected to speech channel the time and make things convenient for the user, on the other hand, the phone burglar alarm that provides of the utility model has anti-key auditory function.
The purpose of this utility model is to realize like this; construct a kind of phone and prevent that usurping alarm comprises line voltage distribution detecting unit 1; legal off-hook detection unit 2; control unit 3; anti-alarm unit 4 and the auxiliary on-hook unit 5 usurped; the output signal that described control unit 3 is accepted from described line voltage distribution detecting unit 1 and legal off-hook detection unit 2; and control signal outputed to described anti-alarm unit 4 and the described auxiliary on-hook unit 5 usurped; described auxiliary on-hook unit 5 has an end to prevent that with described usurping alarm unit 4 is connected; described legal off-hook detection unit 2 comprises Light Coupled Device (O1 reverse by two inputs and that connect; O2) main circuit of Zu Chenging; by incorgruous two diode series connection groups (D5 and D6 that are connected in parallel; D12 and D11) the divided current circuit that constitutes; by the anti-clutter circuit that resistance R 4 and capacitor C3 are connected in parallel and form, described main circuit; described divided current circuit; described anti-clutter circuit is connected in parallel.
The anti-alarm of usurping of phone of the present utility model, its feature also is, described auxiliary on-hook detecting unit 5 comprises the astable circuit of being made up of resistance R 14, R15, R16, R17, capacitor C 7, C8, triode Q6, Q7, give the power supply capacitor C4 that is used for described astable circuit power supply of capacitor C6 charging by diode D13, resistance R 13, collector and emitter is connected across described capacitor C4 two ends and base stage is connected to the triode Q5 of an output of described astable circuit by the resistance R 18 of serial connection.
Phone of the present utility model is anti-usurps alarm, and its feature also is: the resistance R 4 in described legal off-hook detection unit 2 can be one and be used to regulate the variable resistance that anti-key is listened sensitivity.
The anti-alarm of usurping of phone of the present utility model, its feature also is: describedly anti-usurp alarm unit and increased by resistance R 11, diode Q8, resistance R 12, the current absorption part that voltage-stabiliser tube ZD1 forms, wherein, resistance R 11 is delivered to the current signal of diode Q4 output the base stage of triode Q8, after amplifying, passes through triode Q8 resistance R 12, voltage-stabiliser tube ZD1 absorbs the pulse signal that line current destroys illegal phone, send audio electrical signal by Music Clip IC1 in outside line, triode Q8 is by resistance R 12, voltage-stabiliser tube ZD1 absorbs line current to destroy the pulse dialing signal of illegal phone.
The anti-alarm of usurping of phone of the present utility model, its feature also is: also comprise the external power supply terminal A and the B that are used to connect external 3V battery, wherein the B end is the negative terminal of ground connection, and A is the positive polarity terminal, and this terminal A is connected to inner positive power source terminal by isolating diode D7.
Implement the anti-alarm of usurping of phone of the present utility model; antitheft connect to usurp have high reliability and high stability aspect the phone; validated user is exempted from or reduce economic loss; protect its privacy of correspondence; remove the stolen worry of bringing of validated user circuit, and help rectifying and safeguarding the telecommunications order.
In conjunction with the accompanying drawings and embodiments, further specify characteristics of the present utility model, in the accompanying drawing:
Fig. 1 is the anti-circuit block diagram of usurping alarm of phone of the present utility model;
Fig. 2 is the anti-circuit theory diagrams of usurping alarm of phone of the present utility model.
For a normal telephone set, the voltage of input is 48-60V when on-hook, and electric current is less than 5 microamperes, and input terminal voltage is 10-20V when off-hook, and electric current is the 15-100 milliampere.Pulse dialing signal be a series of 48V-60V (because of switch different different) pulse signal; To be a series of intensity be the audio voltage signal of-4dBds-10dB to the voice-frequency dialing signal.Conversation signal than voice-frequency dialing signal a little less than.When usurping phone and exist, can detect three kinds of states at validated user phone two ends: when (1) validated user used phone, line voltage distribution was 15-100mA for the 10-20V. electric current; (2) steal the hitter when using illegal phone, line voltage distribution is 10-20V, and electric current is about 0; When (3) not having phone to be used on the circuit, line voltage distribution is 48V to 60V, and electric current is about 0.The utility model is exactly according to above characteristics, on the basis that takes into full account ring, dialing, conversation and other interference and influence, by the detection line voltage and current, discerns the legal and illegal of phone.When illegal phone uses, the anti-big electric current of alarm absorption of usurping of phone of the present utility model is used to destroy its pulse signal, send a strong sound signal of telecommunication and destroy its audio signal, make switch can not discern its dialing signal, and in its receiver, form very strong interference sound, free call on somebody else's expense through illegal means person can't be conversed.
In Fig. 1, the anti-alarm of usurping of phone of the present utility model comprises line voltage distribution detecting unit 1, legal off-hook detection unit 2, control unit 3, anti-alarm unit 4 and the auxiliary on-hook unit 5 usurped, the output signal that described control unit 3 is accepted from described line voltage distribution detecting unit 1 and legal off-hook detection unit 2, and control signal outputed to described anti-alarm unit 4 and the described auxiliary on-hook unit 5 usurped, described auxiliary on-hook unit 5 has an end to prevent that with described usurping alarm unit 4 is connected.In addition, also comprise a power unit 6 to each unit power supply.In Fig. 1, increased auxiliary on-hook unit 5, this be because, as the anti-alarm of usurping of phone, only absorbing the pulse dialing signal that a bigger electric current could destroy illegal phone effectively, still, can make line voltage distribution after illegal phone on-hook, still be in low state so always, make wireline inspection unit 1 export high level signal, thereby anti-theft device can not automatic hand-up always, therefore increased auxiliary on-hook unit 5 in the alarm anti-the usurping of phone of the present utility model.Should auxiliary on-hook unit 5 can make after several seconds of reporting to the police and keep burglar alarm and absorb the capacitor C4 discharge of big electric current with alarm unit 4, C4 discharge rear defence is usurped alarm unit 4 break-ofves, and line voltage distribution detecting unit 1 just can detect the time of day of circuit; At this moment, if phone on-hook then line voltage distribution be 48 to 60V, this unit output low level, alarm is on-hook thereupon also; If phone not yet on-hook then line voltage distribution be 10 to 20V, detecting unit 1 output high level, capacitor C4 is recharged again, alarm repeats said process again after minibreak, up to illegal phone on-hook.
Fig. 2 shows the anti-circuit theory diagrams of usurping alarm of phone of the present utility model.As we can see from the figure, line voltage distribution detecting unit 1 is made up of resistance R 1, R2, R3, R5, triode Q1, capacitor C 1, and wherein R1, R2 form bleeder circuit, and R3, R5, Q1 realize the detection to line voltage distribution.
Legal off-hook detection unit in the like product mostly adopts optical coupling series connection rectifier bridge or the optocoupler oppositely circuit form of light-emitting diode in parallel, its deficiency is all to burn optic coupling element easily, when illegal phone pulse dialing, disturb optocoupler to cause outside the legal off-hook illusion easily, the preceding resistance of a kind of circuit form in telephone line is too big, undesirable; A kind of circuit form in back needs to differentiate the positive and negative electrode of outside line in use, and is very inconvenient.The legal off-hook detection unit that the utility model adopted has overcome above-mentioned shortcoming.
The legal off-hook detection unit that adopts in the utility model uses the reverse parallel connection of two optocouplers to connect, and has realized neither increasing the D.C. resistance on the telephone line, need not to judge outside line polarity again.Legal off-hook detection unit 2 in Fig. 2 corresponding to optocoupler O1, O2, resistance R 4, R9, capacitor C 3, diode D5, D6, D11, D12; Light Coupled Device O1, O2 realize the detection to electric current; the auxiliary circuit that resistance R 4, R9, capacitor C 3, diode D5, D6, D11, D12 form can make this device be in the less state of D.C. resistance; and, has very strong antijamming capability simultaneously to optocoupler implementation overcurrent protection.Resistance R 4 in the circuit, capacitor C 3 can be eliminated in the legal phone various leakage currents to the interference of optocoupler, regulating R4 is the annoyance level of the electric current of the legal phone of scalable to optocoupler, thereby make this device have the anti-eavesdrop function, promptly when circuit has illegal phone to eavesdrop, because the electric current of the legal phone of shunting reduces, optocoupler ends, and alarm is just worked.
That adopts in the device of the present utility model anti-ly usurps the part that alarm unit has increased absorption current, specifically, in Fig. 2, the anti-alarm unit 4 of usurping is made up of capacitor C 4, C5, resistance R 7, R8, R10, R11, R12, triode Q4, Q8, IC1 (Music Clip), this diode (LED), buzzer B1, diode D9, voltage-stabiliser tube ZD1.Wherein, the part that is used for absorption current is made up of resistance R 11, triode Q8, resistance R 12, voltage-stabiliser tube ZD1, resistance R 11 is delivered to the current signal of triode Q4 output the base stage of triode Q8, absorb the pulse signal that line current destroys illegal phone by resistance R 12, voltage-stabiliser tube ZD1 after triode Q8 amplifies, the purpose that adopts resistance R 12 and voltage-stabiliser tube ZD1 here is to keep certain line voltage distribution to guarantee the operate as normal of warning device.During this cell operation, send audio electrical signal by Music Clip IC1 in outside line, to destroy the voice-frequency dialing signal of illegal phone, triode Q8 absorbs line current to destroy the pulse dialing signal of illegal phone by resistance R 12, voltage-stabiliser tube ZD1.Buzzer B1, LED send sound and light alarm signal call user's attention.
Auxiliary on-hook unit 5 includes a stable-less circuit that is used to produce pulse, its every mistake was sent a pulse in several seconds, deliver to the base stage of triode Q5 by resistance R 18, triode Q5 conducting is to capacitor C 4 discharges, and capacitor C 6, diode D13, resistance R 13 are formed the relatively independent power pack of astable circuit.This unit can make after reporting to the police several seconds keeps the anti-capacitor C4 discharge that is used to absorb big electric current in the alarm unit 4 of usurping, make anti-alarm unit 4 break-ofves of usurping, and then make the line voltage distribution detecting unit can detect the time of day of circuit, this moment if phone on-hook then line voltage distribution be that 48V is to 60V, this unit output low level, alarm is on-hook thereupon also; Phone not yet during on-hook line voltage distribution be that 10V is to 20V, this unit output high level, this moment, capacitor C 4 was recharged again, and alarm repeats said process again after minibreak (to such an extent as to time compole short illegal phone can not send a dialing signal), up to illegal phone on-hook.
Auxiliary on-hook unit 5 is made up of diode D13, capacitor C 6, C7, C8, resistance R 13-R18, triode Q5, Q6, Q7, resistance R 14, R17, capacitor C 7, C8, triode Q6, Q7 form astable circuit, charge as the relatively independent power supply of this astable circuit to capacitor C6 by diode D13, resistance R 13, resistance R 18 is delivered to the output signal of stable-less circuit the base stage of triode Q5, triode Q5 makes capacitor C 4 discharges, at this moment, wireline inspection unit 1 and legal off-hook detection unit 2 can detect whether off-hook of disabled user.
Further specify using method and the operation principle of embodiment of the present utility model.Outside line is connected on the input (IN1 and IN2) of the utility model device, legal phone is connected on the output (OUT1 and OUT2) of this device.When not having the phone off-hook on the circuit, Q1 is in conducting state, and line voltage distribution detects detecting unit 1 and there is no high level signal output, triode Q3, Q2 in the control unit 3 end, anti-theft alarm unit 4 is not worked, and this device is in hook state, and this moment, leakage current was less than 5 microamperes.
When the people uses illegal phone, line voltage distribution test section 1 output high level signal, optocoupler O1, O2 in the legal off-hook detection unit 2 end, at this moment, triode Q2, the Q3 conducting of control pushing unit 3 are to the capacitor C4 of anti-theft alarm unit 4 charging, when capacitor C4 voltage is higher than the conducting voltage of triode Q4, anti-theft alarm unit 4 is started working: the IC1 as Music Clip sends the acoustic current-meter signal to circuit on the one hand, and buzzer B1 is sounded; LED is connected with diode D9 and be can be IC1 stable operating voltage is provided, and sends light signal; The Q8 conducting makes ZD1 and R12 by big electric current.Destroy audio frequency or the pulse dialing signal of stealing the hitter, and make its receiver produce interference sound, realize warning function.When C4 promotes anti-theft alarm unit 4 work, charge to capacitor C 6 by diode D13, resistance R 13, also started working in auxiliary on-hook unit 5: to report to the police beginning after several seconds, astable circuit in the auxiliary on-hook unit 5 is exported a high level pulse, make triode Q5 conducting, capacitor C 4 discharges, anti-theft alarm unit 4 of short duration dormancy.At this moment, still do not have on-hook if steal the hitter, then this device repeats said process, continues sound and light alarm.At this moment, if steal hitter's on-hook, then line voltage distribution detecting unit 1 no longer includes signal output, and control pushing unit 3 quits work this device automatic hand-up.
When using legal phone, voltage detection unit 1 has high level output, but the optocoupler conducting of legal detecting unit 2, control pushing unit 3 and anti-theft alarm unit 4 still can not be worked.Therefore validated user can dial and converse normally.
If change resistance R 4 into variable resistor, regulate this variable resistor, make it when legal off-hook, just not report to the police, then this device promptly has anti-key auditory function, when people parallel operation and key in outside line are listened, sound and light alarm is just arranged.
If A, B in Fig. 2 end adds the battery of a 3V voltage, the utility model promptly has the line fault warning function.When circuit breaks down as broken string, short circuit, with regard to sound and light alarm.
In embodiment of the present utility model, outside line is connect input (IN1 and IN2), legal phone and extension set are connect output (OUT1, OUT2), burglar alarm just enters normal operating conditions, and can reliably realize preventing the purpose of fraudulent use of telephone.
Claims (5)
1. a phone prevents that usurping alarm is characterized in that: comprise line voltage distribution detecting unit 1; legal off-hook detection unit 2; control unit 3; anti-alarm unit 4 and the auxiliary on-hook unit 5 usurped; the output signal that described control unit 3 is accepted from described line voltage distribution detecting unit 1 and legal off-hook detection unit 2; and control signal outputed to described anti-alarm unit 4 and the described auxiliary on-hook unit 5 usurped; described auxiliary on-hook unit 5 has an end to prevent that with described usurping alarm unit 4 is connected; described legal off-hook detection unit 2 comprises Light Coupled Device (O1 reverse by two inputs and that connect; O2) main circuit of Zu Chenging; by incorgruous two diode series connection groups (D5 and D6 that are connected in parallel; D12 and D11) the divided current circuit that constitutes; by the anti-clutter circuit that resistance R 4 and capacitor C3 are connected in parallel and form, described main circuit; described divided current circuit; described anti-clutter circuit is connected in parallel.
2. the anti-alarm of usurping of phone according to claim 1, its feature also is, described auxiliary on-hook detecting unit 5 comprises the astable circuit of being made up of resistance R 14, R15, R16, R17, capacitor C 7, C8, triode Q6, Q7, give the power supply capacitor C4 that is used for described astable circuit power supply of capacitor C 6 chargings by diode D13, resistance R 13, collector and emitter is connected across described capacitor C4 two ends and base stage is connected to the triode Q5 of an output of described astable circuit by the resistance R 18 of serial connection.
3. phone according to claim 1 is anti-usurps alarm, and its feature also is: the resistance R 4 in described legal off-hook detection unit 2 can be one and be used to regulate the variable resistance that anti-key is listened sensitivity.
4. the anti-alarm of usurping of phone according to claim 1, its feature also is: describedly anti-usurp alarm unit and increased by resistance R 11, triode Q8, resistance R 12, the current absorption part that voltage-stabiliser tube ZD1 forms, wherein, resistance R 11 is delivered to the current signal of triode Q4 output the base stage of triode Q8, after amplifying, passes through triode Q8 resistance R 12, voltage-stabiliser tube ZD1 absorbs the pulse signal that line current destroys illegal phone, send audio electrical signal by Music Clip IC1 in outside line, triode Q8 is by resistance R 12, voltage-stabiliser tube ZD1 absorbs line current to destroy the pulse dialing signal of illegal phone.
5. the anti-alarm of usurping of phone according to claim 1, its feature also is: also comprise the external power supply terminal A and the B that are used to connect external 3V battery, wherein the B end is the negative terminal of ground connection, and A is the positive polarity terminal, and this terminal A is connected to inner positive power source terminal by isolating diode D7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95220654 CN2256611Y (en) | 1995-08-23 | 1995-08-23 | Alarm for fraudulent use of telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95220654 CN2256611Y (en) | 1995-08-23 | 1995-08-23 | Alarm for fraudulent use of telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2256611Y true CN2256611Y (en) | 1997-06-18 |
Family
ID=33868482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95220654 Expired - Fee Related CN2256611Y (en) | 1995-08-23 | 1995-08-23 | Alarm for fraudulent use of telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2256611Y (en) |
-
1995
- 1995-08-23 CN CN 95220654 patent/CN2256611Y/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2256611Y (en) | Alarm for fraudulent use of telephone | |
| CN2230486Y (en) | Alarm for preventing fraudulent using telephone and eavesing from telephone | |
| CN2149067Y (en) | Multi-function telephone | |
| CN2239685Y (en) | Telephone line monitoring device | |
| CN2220139Y (en) | Theft-proof terminal box for telephone | |
| KR0124229Y1 (en) | Recovery installation of separated receiver and transmitter | |
| CN2223872Y (en) | Branch route administration device for main telephone set and extension set | |
| CN2245310Y (en) | Device resisting stealing utilization of electricity for telephone line | |
| CN2172548Y (en) | Multifunctional telephone junction box | |
| CN2241954Y (en) | Telephone set with function of disconnection alarming and preventing eavesdropping and preventing unauthorised calling | |
| CN2212863Y (en) | Multifunctional telephone switchboard apparatus | |
| CN2249468Y (en) | Telephone anti-theft alarm | |
| CN2188264Y (en) | Subscriber telephone protector | |
| CN2251227Y (en) | Anti-theft apparatus for telephone | |
| CN2231838Y (en) | Alarm inhibiting apparatus for preventing fraudulent use of telephone line | |
| CN2222985Y (en) | Micropower multifunctional full-automatic telephone monitor | |
| CN2259028Y (en) | Protector for avoiding fraudulent use of telephone line | |
| CN2185963Y (en) | Theft-proof alarm for telephone line | |
| CN2196349Y (en) | Telephone anti-theft device | |
| CN2414565Y (en) | Fully automatic telephone multi-function alarm system controller | |
| CN2312545Y (en) | Multi-functional means for preventing unauthorised calling for telephone | |
| CN2285033Y (en) | Telephone-transmitting alarm | |
| CN2194052Y (en) | Monitor for preventing theft of telephone line | |
| CN2282304Y (en) | Multifunctional telephone anti-theft eavesdropping alarm | |
| CN2263855Y (en) | Anti-theft alarm for mobile telephone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |