CN2227893Y

CN2227893Y - Engaging calling device for preventing stealing call

Info

Publication number: CN2227893Y
Application number: CN 94216436
Authority: CN
Inventors: 施国荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-04
Filing date: 1994-07-04
Publication date: 1996-05-22
Anticipated expiration: 2004-07-04

Abstract

The utility model discloses a calling device for preventing stealing call and engaging, which is connected in parallel with an inlet wire circuit of a telephone. A circuit of the calling device comprises a voltage polarity changing circuit, a sampling circuit, a monitor controlling circuit, an engaging indication circuit, a signal generation circuit, an amplifying circuit, a power supply circuit and a speaker. A linked switch button on a shell is used for realize the display function of preventing stealing call and engaging to cause extension subscribers to learn the state of line operation without carrying a handset; a lighting indicating lamp means that the telephone line is busy, otherwise, the telephone can be dialed; the work efficiency is improved largely; when other people steal to call the phone, the device can also call the host to reach the purpose of preventing stealing call; the design has simple line construction and low cost, which is easily accepted by users.

Description

Surreptitiously beat, the busy call device

The utility model relates to the additional call device of telephone set, is used for each extension set of party-line the line is busy showing and other people surreptitiously snore and cry warning.

Present various advanced multi-feature telephone and various attachment device such as toll telephone limit is pulled out device, taximeter or the like, and not only cost height, price are expensive, and whether all do not have the collinear extension telephone of demonstration by the line is busy or the stolen call function of beating.Along with deepening continuously of economic reform, develop rapidly as the spring bamboo behind company's elephanta of various character, multiple-workstations and the phenomenon that connects are very general, when each minute confidential conversation has inevitably taken place, the line is busy can't reach the conversation purpose by other extension sets because of not knowing telephone line, and this situation must just be known when mentioning telephone receiver, thereby influenced office efficiency greatly, but when other extension sets do not use again because of not knowing to allow line idle, miss the message register meeting, surreptitiously beaten by other people and when making that telephone charges is poly-phenomenon such as to be increased and take place when telephone line again, all can't implement to call out the bulletin function, therefore, design is a kind of can show that engaged condition can surreptitiously be beaten by the people again and the calling set that can alarm is the task of top priority.

The utility model be exactly avoid the deficiencies in the prior art and provide a kind of and can alarm automatically other people fraudulently phone, can circuit whether by engaged condition a kind of surreptitiously beat, the busy call device.

The utility model is achieved by the following scheme: calling set is connected in parallel on the telephone set input circuit, the linked switch button that install to connect the calling set circuit on the housing of calling set, calling set circuit comprise by inverter of voltage polarity, sample circuit, Monitoring and Controlling circuit, the line is busy display circuit, signal generation circuit, amplifying circuit, power supply circuits, loud speaker and forming.

The advantage of this calling set is when other people carry out fraudulently phone, can produce a kind of harsh noise automatically and feed back in the telephone receiver of stealing the hitter, it can't be clarified, do not hear dialog context and can't reach and beat purpose with surreptitiouslying, and the calling owner arrests the burglar rapidly.Its another advantage is not carry telephone receiver just can observe line status at any time, and indicator light is bright, illustrates that the line is busy, otherwise can call, and operating efficiency greatly improves, and the design also has the low advantage of the simple cost of line construction, and is susceptible to user acceptance.

Description of drawings.

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model circuit theory diagrams.

Further be described in detail again by above-mentioned accompanying drawing embodiment.

Surreptitiously beat, busy call device (referring to Fig. 1-2) is connected in parallel on the telephone set input circuit, it has a housing, and the linked switch button that connects the calling set circuit is housed on the housing.

The calling set circuit comprises by diode D ₁-D ₄The output of the inverter of voltage polarity of forming (1) inserts by resistance R ₁, R ₂The sample circuit of forming (2), the output of sample circuit (2) inserts by ic chip ₁, the Monitoring and Controlling circuit (3) formed of voltage-stabiliser tube DW, the output of Monitoring and Controlling circuit (3) inserts simultaneously by ic chip ₂, resistance R ₄The signal generation circuit of forming (4) and by LED, resistance R ₃The display circuit (7) of forming that the line is busy, the output of signal generation circuit (4) and the power supply circuits (5) be made up of power supply E inserts simultaneously by triode V _TThe amplifying circuit of forming (6), the output of amplifying circuit (6) inserts loud speaker Y.

Ic chip ₁Model be SJ618, IC ₂Model be TM806.The K of linked switch button _1-1Be contained between Monitoring and Controlling circuit (3) and the signal generation circuit (4).K _1-2Be contained between power supply circuits (5) and the amplifying circuit (6), when not needing thief-proof beating, can cut off power supply circuits.Power supply circuits power supply E is made up of 2～3 joint No.5 cells or the civil power step-down reaches.

Its dynamic structure is as follows: phone is when each extension set on-hook usually, and the supply voltage that outside line provides is about direct current 50V, by diode D ₁-D ₄(being inverter of voltage polarity), and through the resistance R of sample circuit ₁And R ₂Dividing potential drop is added to Monitoring and Controlling circuit chip IC ₁Sampling input 3 pin, make the sampling input be high level, through Monitoring and Controlling circuit chip IC ₁Internal circuit monitoring and with reference edge 2 pin relatively after, its output 4 pin do not have level output, so the LED of the line is busy display circuit is not luminous, ic chip ₁1 pin be power input.Same signal generation circuit chip IC ₂Power end 1 pin do not work because of can not get voltage, call out not sounding (no matter K switch is arranged at " a " or " b " end) of loud speaker Y.When a certain extension set is mentioned telephone receiver (fraudulently phone is equivalent to the extension telephone that inserts in parallel), because the load effect of phone, the 50V voltage of outside line is reduced to about 7V immediately, and the voltage that be added to the sampling input of Monitoring and Controlling circuit this moment is low level, through Monitoring and Controlling circuit chip IC ₁After the internal circuit monitoring, make its output export high level rapidly, at this moment the line is busy, and the display circuit LED is luminous, and telephone line is described, and the line is busy, that is to say that needn't mention telephone receiver just can know that telephone line is by the line is busy.

Have or not stolen engaging if wonder number, as long as K switch is arranged at " b " end, because ic chip ₂1 pin be power input, 2 pin are trigger end, and it and V _Ss6 pin of the utmost point (power supply E negative pole) link to each other, and make it get final product trigger signals generation circuit working when 1 pin is high level, and 3 pin, 4 pin are ic chip ₂External vibration end, so work as ic chip ₁Output when being high level, can make signal generation circuit chip IC ₂Work, its output 5 pin are high level, make amplifying circuit triode V _TAt this moment conducting is called out loud speaker Y and can be sent a kind of ear-piercing noise automatically, and feeds back in the earphone of stealing hitter's phone, makes surreptitiously the hitter not hear dialog context and can't reach and beat purpose with surreptitiouslying, and the while is called out owner immediately, and notifying has people's fraudulently phone.

Claims

One kind surreptitiously beat, the busy call device, it is characterized in that:

A. calling set is connected in parallel on the telephone set input circuit;

B., the linked switch button that connects the calling set circuit is housed on the housing of calling set;

C. the calling set circuit is made up of inverter of voltage polarity (1), sample circuit (2), Monitoring and Controlling circuit (3), the line is busy display circuit (7), signal generation circuit (4), amplifying circuit (6), power supply circuits (5), loud speaker; The output of inverter of voltage polarity (1) inserts sample circuit (2), the output of sample circuit (2) inserts Monitoring and Controlling circuit (3), the output of Monitoring and Controlling circuit (3) inserts signal generation circuit (4) and the line is busy display circuit (7) simultaneously, the output of signal generation circuit (4) and power supply circuits (5) inserts amplifying circuit (6), and the output of amplifying circuit (6) inserts loud speaker Y.
2. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described inverter of voltage polarity (1) is by diode D ₁-D ₄Form.
3. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described sample circuit (2) is by resistance R ₁, R ₂Form.
4. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described Monitoring and Controlling circuit (3) is by ic chip ₁Form with voltage-stabiliser tube DW.
5. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described the line is busy display circuit (7) is by LED and resistance R ₃Form.
6. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described signal generation circuit (4) is by ic chip ₂And resistance R ₄Form.
7. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described amplifying circuit (6) is by triode V _TForm.
8. as claimed in claim 1ly surreptitiously beat, the busy call device, it is characterized in that described power supply circuits (5) are made up of power supply E.