CN2197775Y - Automatic limiting device for illegal access telephone - Google Patents
Automatic limiting device for illegal access telephone Download PDFInfo
- Publication number
- CN2197775Y CN2197775Y CN 94208657 CN94208657U CN2197775Y CN 2197775 Y CN2197775 Y CN 2197775Y CN 94208657 CN94208657 CN 94208657 CN 94208657 U CN94208657 U CN 94208657U CN 2197775 Y CN2197775 Y CN 2197775Y
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- Prior art keywords
- circuit
- phone
- dialing
- voltage
- resistance
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- Expired - Fee Related
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- 230000001681 protective effect Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000003245 working effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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- Telephonic Communication Services (AREA)
Abstract
The utility model provides an illegal access telephone automatic limiting device belongs to the additional installation that the user used in the telephone communication field. The device consists of a polarity protection circuit, a voltage judgment circuit, a phone identification circuit, a pulse dialing limiting circuit, an audio dialing limiting circuit and an alarm circuit. When the voltage judging circuit and the telephone identification circuit identify that the stolen telephone is used, a signal is sent out to control the pulse dialing limiting circuit and the audio dialing limiting circuit to work, so that the dialing signal of the stolen telephone cannot be correctly received by the switchboard, the conversation cannot be carried out, and the alarm is given at the same time. The device has small volume and low cost, and can prevent the phenomenon of stealing telephone lines.
Description
The utility model provides a kind of illegal access phone volitional check device, belongs to the attachment device of a kind of telephonic communication in the electricity field.
Along with the development of information-intensive society, this communication tool of phone enters family step by step, and phone is various information for people are transmitting, and has brought joy and wealth for many families.But, because telephone line is by steal, and make the telephone subscriber suffer economic loss, also brought many worries to people.In the existing telephone line, user's phone directly is connected on the telephone line, privately phone is attempted by fraudulently phone on the circuit before the subscriber phone if any the people, and the user is difficult for discovering, and also can't prevent this illegal activities.
The purpose of this utility model is to provide a kind of and is contained in the telephone set, or be serially connected with a kind of illegal access phone volitional check device between telephone line and substation, when the machine of stealing is proposed the machine dialing, this device can be limited stealing pulse dialing or the dual-tone dialing signal that machine sends, its signal can not correctly be received by switch, can not converse.Simultaneously, this device can send alarm signal, and the telephone line of call user's attention oneself is by the illegal steal of people.
Illegal access phone volitional check device provided by the utility model is by housing, printed wiring board and electronic circuit are formed, described electronic circuit, by the polar protective circuit I, voltage decision circuitry II, phone identification circuit III, pulse dialing restricting circuits IV, voice-frequency dialing restricting circuits V and warning circuit VI are formed, the polar protective circuit I is a voltage decision circuitry II with the signal voltage that the phone feeder voltage becomes fixed polarity, pulse dialing restricting circuits IV and voice-frequency dialing restricting circuits V provide operating voltage, phone identification circuit III is arranged between subscriber phone inlet wire and voltage decision circuitry II, when stealing the line receiver off-book, the voltage signal of the polar protective circuit I being sent here by voltage decision circuitry II after judging to pulse dialing restricting circuits IV, voice-frequency dialing restricting circuits V and warning circuit VI are sent the high level enabling signal, at this moment, the work of pulse dialing restricting circuits VI absorbs the dial impulse signal, voice-frequency dialing restricting circuits V produces audio frequency makes surreptitiously the line phone not converse in disturbing signal, and the warning circuit VI is reported to the police simultaneously; When the substation off-hook, by the phone identification circuit phone signal is delivered to voltage decision circuitry II, make it produce low level signal and can not start back three-pole circuit work, subscriber phone normal talking.
Wherein: the polar protective circuit I is by diode D
1, D
2, D
3, D
4Bridge circuit is formed.
Voltage decision circuitry II is by voltage stabilizing didoe D
5, resistance R
1, R
2, R
3, R
4, capacitor C
1, C
2, C
3The bleeder circuit and the CMOS integrated circuit NAND gate IC that constitute
1AForm, bleeder circuit is serially connected between two output lines of polar protective circuit, and voltage division signal output meets CMOS integrated circuit NAND gate IC
1AInput.
Phone identification circuit III is by photoelectrical coupler PC, resistance R
5With diode D
6Form, luminescent device is made of the light-emitting diode of two parallel connected in reverse phase in the photoelectrical coupler PC, is serially connected in the resistance R on the substation inlet wire
5, being attempted by simultaneously on the input of photoelectrical coupler, the output of photoelectrical coupler is by diode D
6Join with the input of NAND gate in the voltage decision circuitry II.
Pulse dialing restricting circuits IV is by resistance R
10, R
11, BG
3, BG
4The multiple tube and the diode D that constitute
7, capacitor C
6Form, by BG
3, BG
4The base stage of the multiple tube that constitutes is by voltage R
10Join with the output of voltage decision circuitry II.
Voice-frequency dialing restricting circuits V is by resistance R
6, R
7, R
8, R
9, capacitor C
4, C
5, NAND gate IC
1B, IC
1CThe keyer multivibrator circuit and the transistor BG that form
1, BG
2The multiple tube of forming constitutes, and the output of the input of keying multi-resonant oscillating circuit and voltage decision circuitry II is joined, and its output connects audio amplifier circuit.
The warning circuit VI is by resistance R
12, R
13, capacitor C
7, NAND gate IC
2A, IC
2B, IC
2C, IC
2DPiezoelectric buzzer HTD forms, and the startup of warning circuit VI is controlled by voltage decision circuitry II, and the input signal of warning circuit is taken from the keying multi-resonant oscillating circuit in the voice-frequency dialing restricting circuits V.
The operating state of following labor illegal access phone volitional check device provided by the utility model under different situations is to further specify operation principle.
One, substation, the machine of stealing all are in hook state (or not having the machine of stealing)
The feeder voltage of this moment is 48V or 60V, and therefore bleeder circuit makes NAND gate IC in the voltage decision circuitry II
1AOutput low level, the BG in the control impuls dialing restricting circuits IV
3, BG
4Be in cut-off state, make the voice-frequency dialing restricting circuits V sound intermediate frequency blocking of oscillator simultaneously, and at IC
1CThe output output low level, control BG
1, BG
2Also end, the warning circuit VI also can't start.Thereby make pulse dialing restricting circuits IV, voice-frequency dialing restricting circuits V and warning circuit VI are not all worked.
Two, substation is in hook state, steals the machine off-hook and uses
When stealing the machine off-hook, because feeder voltage lower (7-12V) is added in NAND gate IC in the voltage decision circuitry II
1AThe voltage division signal of input makes NAND gate output high level, and high level signal passes through resistance R
10Be added in the pulse dialing restricting circuits IV by transistor BG
3, BG
4On the multiple tube base stage that constitutes, make multiple tube reach full and close state, thus control capacitance C
6Absorb the pulse dialing signal that the machine of stealing sends, make the arteries and veins portion signal of dial-out can not reach the amplitude that makes the correct reception of exchange function, and can't put through phone.The utility model also is provided with voice-frequency dialing restricting circuits V, NAND gate IC in voltage decision circuitry II
1ADuring the output high level, high level signal makes the keying multi-resonant oscillating circuit work in the voice-frequency dialing restricting circuits V simultaneously, and this audio signal is through multiple tube BG
1, BG
2Deliver on the feeder line after the amplification, because the voice-frequency dialing frequency of this signal frequency and phone is close, and amplitude is enough big, so when the machine of stealing dials with the voice-frequency dialing mode, steal the voice-frequency dialing signal that machine sent and covered, switch can't correctly be received by this audio signal.The utility model also is provided with the warning circuit VI, when stealing machine off-hook use phone, by NAND gate output high level in the voltage decision circuitry II, start the work of warning circuit VI, the audio signal of warning circuit VI is taken from the keyer multivibrator of voice-frequency dialing restricting circuits V.
Three, substation off-hook steals that the machine on-hook is stopped using or when not having the machine of stealing.
At this moment, make feeder voltage drop to 7-12V during the substation off-hook, but during owing to the substation off-hook, there is electric current from phone identification circuit III, to flow through in the light-emitting diode on the photoelectrical coupler PC, the light-emitting diode of parallel connected in reverse phase makes that feeder voltage is that any polarity chron all can make photoelectrical coupler PC conducting, V on the photoelectrical coupler
DDOutput and diode D by photoelectrical coupler PC
6Be added in NAND gate IC
1AInput, make NAND gate IC
1AInput by embedding built in high level, NAND gate IC
1AOutput low level, pulse dialing restricting circuits IV, voice-frequency dialing restricting circuits V and warning circuit VI are not all worked in the original device.
Table one is depicted as the operating state of the main components and parts of each circuit of the utility model under different situations.
Illegal access phone volitional check device provided by the utility model has the advantage that volume is little, in light weight, cost is low.All circuit can be contained in the capsule.This product can replace existing terminal box, also can be contained in the telephone set, when being contained in the phone, can with the shared polar protective circuit of telephone set.Use this device can prevent unauthorized steal telephone line effectively, the machine of no matter stealing uses voice-frequency dialing mode or pulse dialing method all can't put through phone.Simultaneously, because this device has used the CMOS integrated circuit, power consumption is economic, and complete machine absorption line current is very low.
Description of drawings:
Fig. 1, the utility model circuit block diagram
Fig. 2, the utility model electrical schematic diagram
The utility model can be by electrical schematic diagram assembling shown in Figure 2, and wherein NAND gate is a cmos circuit in each circuit, transistor BG
1, BG
2, BG
3, BG
4Be high inverse-voltage tube, photoelectrical coupler can be made on request.
Table one
| The line load state | Line voltage distribution | Optocoupler output | IC 1A?Input | IC 1AOutput | Audio frequency oscillator | BG 1BG 2Audio frequency output | BG 3BG 4Operating state | Chimes of doom |
| When no phone uses | 48V or 60V | End | High level | Low level | Nonoscillatory | Do not have | End | Do not have |
| The substation off-hook | 9V | Conducting | High level | Low level | Nonoscillatory | Do not have | End | Do not have |
| Steal the machine off-hook | 9V | End | Low level | High level | Vibration | Have | Saturated | Have |
Claims (5)
1, a kind of illegal access phone volitional check device, by housing, printed wiring board and electronic circuit are formed, it is characterized in that electronic circuit is by the polar protective circuit I, voltage decision circuitry II, phone identification circuit III, pulse dialing restricting circuits IV, voice-frequency dialing restricting circuits V and warning circuit VI are formed, the polar protective circuit I is a voltage decision circuitry II with the signal voltage that the phone feeder voltage becomes fixed polarity, pulse dialing restricting circuits IV and voice-frequency dialing restricting circuits V provide operating voltage, phone identification circuit III is arranged between subscriber phone inlet wire and voltage decision circuitry II, when stealing the line receiver off-book, the voltage signal of the polar protective circuit I being sent here by voltage decision circuitry II after judging to pulse dialing restricting circuits IV, voice-frequency dialing restricting circuits V and warning circuit VI are sent the high level enabling signal, at this moment, the work of pulse dialing restricting circuits VI absorbs the dial impulse signal, voice-frequency dialing restricting circuits V produces audio frequency makes surreptitiously the line phone not converse in disturbing signal, and the warning circuit VI is reported to the police simultaneously; When the substation off-hook, by the phone identification circuit phone signal is delivered to voltage decision circuitry II, make it produce low level signal and can not start back three grades of circuit workings, subscriber phone normal talking.
2, according to the described illegal access phone volitional check device of claim 1; it is characterized in that described voltage decision circuitry II; the bleeder circuit and the CMOS integrated circuit NAND gate IC1A that are formed by voltage stabilizing didoe D5, resistance R 1, R2, R3, R4, capacitor C 1, C2, C3 form; voltage stabilizing didoe D5, resistance R 1, R2, R3, R4 in the bleeder circuit, be serially connected with between two outputs of polar protective circuit I, the dividing potential drop output of bleeder circuit connects the input of CMOS integrated circuit NAND gate.
3, according to claim 1 or 2 described illegal access phone volitional check devices, it is characterized in that described phone identification circuit III is made up of photoelectrical coupler PC, resistance R 5 and diode D6, luminescent device is made up of the light-emitting diode of two parallel connected in reverse phase in the photoelectrical coupler PC, be connected on resistance R 5 on the subscriber phone inlet wire and be connected in parallel on the input of photoelectrical coupler PC, the output of photoelectrical coupler PC is joined by the input of NAND gate IC1A in diode D6 and the voltage decision circuitry II.
4, according to claim 1 or 2 described illegal access phone volitional check devices, it is characterized in that described pulse dialing restricting circuits IV is made up of multiple tube and diode D7, capacitor C 6 that resistance R 10, R11, transistor BG3, BG4 form, the pulse dialing circuit IV is joined with the output of voltage decision circuitry II by the resistance R 10 that is connected on transistor BG3 base stage.
5, according to claim 1 or 2 described illegal access phone volitional check devices, it is characterized in that described voice-frequency dialing restricting circuits V comprises resistance R 6, R7, capacitor C 4, amplifying circuit two parts that keying multi-resonant oscillating circuit that CMOS integrated circuit NAND gate IC1B and IC1c form and the multiple tube that is made of resistance R 8, transistor BG1, BG2 and resistance R 9, capacitor C 5 are formed, the output of the input of keying multi-resonant oscillating circuit and voltage decision circuitry II is joined, and its output is joined with amplifying circuit by the resistance R 8 that is connected on the multiple tube base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94208657 CN2197775Y (en) | 1994-04-11 | 1994-04-11 | Automatic limiting device for illegal access telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94208657 CN2197775Y (en) | 1994-04-11 | 1994-04-11 | Automatic limiting device for illegal access telephone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2197775Y true CN2197775Y (en) | 1995-05-17 |
Family
ID=33826602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94208657 Expired - Fee Related CN2197775Y (en) | 1994-04-11 | 1994-04-11 | Automatic limiting device for illegal access telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2197775Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012106953A1 (en) * | 2011-02-12 | 2012-08-16 | 中兴通讯股份有限公司 | Device and method for detecting state of overload and overcurrent protector |
-
1994
- 1994-04-11 CN CN 94208657 patent/CN2197775Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012106953A1 (en) * | 2011-02-12 | 2012-08-16 | 中兴通讯股份有限公司 | Device and method for detecting state of overload and overcurrent protector |
| US9116211B2 (en) | 2011-02-12 | 2015-08-25 | Zte Corporation | Device and method for detecting state of overload and overcurrent protector |
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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 |