CN2338923Y - Card type telephone anti-theft alarm - Google Patents

Abstract

The utility model discloses a card type telephone burglar alarm, which mainly comprises a sender, a state detector, a time controller, a damper, a receiving controller, an acoustic alarm, a code display and the like. When the alarm is used, once a person steals a call on a magnetic card telephone or an IC card telephone line of a post and telecommunications office, a person on duty in a measuring room can immediately know the call. The alarm device can immediately and automatically block the call circuit, send voice warning to the stolen phone, send alarm sound to the person on duty in the measuring room, and automatically display the number of the stolen phone. The product is a powerful tool for preventing loss of huge telephone charge and strengthening charge management, and is widely used for magnetic cards and various IC card telephones.

Description

Cassette phone burglar alarm

The utility model discloses a kind of cassette phone burglar alarm.At present because the paid utilization of phone, develop into the two family house free call on sb. else's expense through illegal means of making contact from robber's sign indicating number of analog mobile telephone, free call on somebody else's expense through illegal means is of common occurrence.And all kinds of cassette phones of post and telecommunications office often are installed in the indoor use of some units owing to their particularity, and circuit lays obviously, arbitrarily the doubling free call on sb. else's expense through illegal means.Some cassette Telephone Management Agency personnel to post and telecommunications office's inside account charging number whether really the true use magnetic card value of magnetic-type phone throw doubt upon.Because the circulation of the magnetic card whole nation also exists the individual to purchase the card collection simultaneously, thereby can't add up, check.

The purpose of this utility model is to overcome the deficiency that the cassette phone does not have anti-theft feature, provide a kind of no matter phone stealer with what mode free call on somebody else's expense through illegal means, the capital causes that speech channel is blocked automatically and the telephone number of the circuit correspondence of demonstration robber words, prevents the generation of free call on somebody else's expense through illegal means effectively.

The utility model is achieved in that sender unit is contained in the cassette machine that the lead-in wire 1,2 of sender unit and lead-in wire a, the b of cassette machine join, and 1,3 lines (to the line of post and telecommunications office's direction) link to each other with the line that comes of post and telecommunications office's direction; State detector, time controller, damper, the alert device of sound, an apparent sign indicating number device, collection of letters controller etc. are in same body (main frame) all, is installed between switch and the local telephone outside line, is placed on main frame and only goes up or other suitable position.Also promptly 3,4 lines are connected to the outside line direction, and 5,6 lines are connected to the switch direction; When the cassette machine normally used, sender unit sent out one or more groups superaudio signal, was received by collection of letters controller, and circuit is not reported to the police, and does not also influence normal talking.When the phone stealer uses other any phone, owing to there is not superaudio cross complaint signal, after surpassing the several seconds kind, time controller work, shows sign indicating number device work and reports to the police control damper, alarm.The T2 of state detector is defeated to be gone out with time controller to link to each other, and with filter LB, determine the time controller operating state.

Fig. 1 is the electrical principle block diagram of cassette phone burglar alarm;

Fig. 2 is the sender unit electrical schematic diagram of cassette phone burglar alarm;

Fig. 3 is the main frame electrical schematic diagram of cassette phone burglar alarm.

Below in conjunction with accompanying drawing most preferred embodiment of the present utility model is elaborated:

Fig. 1 shows the electrical principle block diagram of cassette phone burglar alarm.Power supply adopts the 220V civil power, one-tenth+5V power voltage supply after the transformation rectification, and the cassette phone links to each other with sender unit; The office direction telephone wire links to each other to circuit with machine by outside line.State detector detects the plucking of cassette phone, receiver-on-hook condition; The superaudio signal of sender unit is received by collection of letters controller, in case lose the superaudio signal in the circuit, time controller was worked in the several seconds, starts damper blocking-up machine to circuit, makes speech channel interrupt and can't converse, and reports to the police, shows number simultaneously.

Fig. 2 is the sender unit electrical schematic diagram of cassette Device for anti-fraudulent use telephone line alarm; 1,2 lines connect a, the b line of cassette phone, and 1,3 lines connect the office direction telephone wire.N1 is six reversers (CD4069), and N2 is a photoelectrical coupler.When the cassette machine is done caller (off-hook), outer line drop is to 6V-10V, after the D5-D8 rectification, electric current flows through 1 of photoelectrical coupler N2,2 pin, 3 of N2,4 pin conductings, T1 obtains base current and conducting, the working power of N1 is provided, 3 of N1,4,5,6,10,11, with C1, the CMOS multivibrator that R1 forms and (operation principle is seen Electronic Industry Press's " homemade integrated circuit is used 500 examples "), its frequency electricity depends on R1, the C1 value makes it greater than audio frequency, this superaudio signal is through R2, the C4 output that is coupled is through D1-D4 output office direction outside line (being sent to the collection of letters controller of main frame).C3, R5 improve the ring effect among the figure, and L1 stops dialing tone, R3 current limliting, C2 anti-interference capacitor, the conducting speed of 1, the 2 raising T1 of N1.(on-hook attitude) office direction 1,3 lines come ringing-current when called when the cassette machine is done, and through D5-D8, to 2 lines, get back to 1 line through the cassette machine through 1 pin of C3, R5, N2 from 3 lines.Cassette machine bell ring, the off-hook conversation.Though this signal enters speech channel, do not influence normal talking because the oscillator output that N1 forms is the superaudio signal this moment.

Fig. 3 is the main frame electrical schematic diagram of cassette phone burglar alarm, and state detector mainly is made up of D9, R6, C5, T2, R7; Time controller mainly is made up of N3, C6, R8, R9 etc.When the cassette machine is in hook state, it is exactly that the sky of switch cuts and goes out voltage (about 48V) that D10-D13 goes out voltage, D9 (getting the 24V voltage-stabiliser tube) is in the puncture operating conditions, the T2 saturation conduction, its collector electrode output electronegative potential, through the 4 pin output of N3, make the retardation element C6 of time controller go up no-voltage, 8 pin of N3 are also exported electronegative potential, behind cassette machine off-hook, outer line drop is (voltage of exporting during switch load) about 6V, and D9 ends, and T2 also ends, external voltage is coupled to 1 pin of N3 through R7, its 4 pin is a high potential, and C6 begins to be recharged, and the 5 pin voltages time-delay of N3 is risen.8 pin will go out the high-order damper work of preparing to start after several seconds.

Damper mainly is made up of R11, R12, D16, T4, N4, relay J, when 8 pin of N3 go out high potential, the T4 saturation conduction, 1, the 2 pin voltage differences that make N4 closely are zero, 3, poly-the increasing of 4 pin resistance and approximate opening circuit, blocked speaking circuit (paths of 3 line to 5 lines), D16 is the shunt alarm indicator.When 8 pin of N3 were low level, T4 ended, and positive supply arrives the C level of T4 again through 1,2 pin of the C of T4 level through N4, makes 3,4 conductings of N4.C8 is in parallel with 3,4 pin of N4, and being provides more reliable alternating current path for 3, No. 4 lines and 5, No. 6 lines, does when called at the cassette machine, and ringing-current better passes through.

Mainly because of adopting finished product, filter is a known technology to collection of letters controller by filter LB (adopting Shandong city Zibo Electric Appliances Factory product), and internal circuit no longer describes in detail).Compositions such as D14, D15, R13, R14, C7, N6, R15, R16, R17, T5, N5, L2.3, the superaudio signal sent of 4 lines (cassette machine) arrives the in-phase end of amplifier N6 more again after D14, D15, C7, R14, R15 rectification shaping through LB filtering, amplifying signal, export from 7 ends, make the T5 conducting on the one hand, this moment N5 3,4 with the L2 short circuit (L2 be initial prevention superaudio signal, and the LB input signal is not shunted, and output signal is bigger, improve the reliable operation degree, in the reality L2 also can).The speech channel impedance is littler, and it is more clear to converse.The 7 pin high potentials of N6 make the T3 saturation conduction through R10 on the other hand, and saturated its Vce ≈ 0 of T3 makes C6 can't continue charging, the 8 pin output electronegative potential of N3, and damper is not worked, but normal talking.From above analysis as can be known,,, time controller is not worked, the situation of damper blocking-up speech channel just can not occur because the 7 pin high potentials of N6 control T3 is saturated as long as the sender unit in the cassette machine has the output of superaudio signal.

The alert device of sound is made up of R18, R20, D17, T6, loudspeaker Y etc.This main frame can manufacture 50 tunnel (supervising 50 cassette machines) or more the multichannel number be one, alert device of sound and language circuit are public part.Among the figure 7,8,9,10,11 are the line multiple connection point of each single channel.Steal words as the people, 8 pin of N3 go out high potential, the T6 conducting, and loudspeaker Y (employing carries the direct current loudspeaker finished product of siren circuit) is rung, and total red light D17 is bright, and the prompting operator on duty checks registration.K is a sound-shutoff switch, uses during the short circuit loudspeaker Y.

Language circuit VY adopts solid language circuit, but integrated package typing types such as " cassette phone paid utilization, use please hold " is advised language.Can be tailor-made in producer.For existing known mature technology, no longer describe in detail.The normally opened contact 1,2 of J relay is incorporated this circuit into speaking circuit when alarm occurring, sends and advises language.

Show the sign indicating number device mainly by dialing integrated package N7 (, can store 20 sets of numbers) accessory and corresponding storage input button (not drawing among the figure) as using WE9148 among the figure

Liquid crystal or digital tube display device (display circuit) XM, the number of the corresponding according to the order of sequence institute of the number that is stored card-joined type telephone set.The audio frequency of dialing integrated package or pulse output end connect display circuit, and this partial circuit is extensive use of in the telephone set of existing band display screen, is known technology, so block diagram only is shown, no longer describe in detail.

The operation principle of WE9148 is seen Chinese Central Television's lecture teaching material " principle of telephone set and maintenance " book, institute is noted that, this integrated package is used in the phone, extract the storage number of a certain memory cell, be by realizing by a certain button among the M1-20 of correspondence, this shows in sign indicating number device one group of normally opened contact replacement with alarm relay J and manually connects the MS key and get final product.Required number is shown.

From above each several part circuit analysis as can be known: when people's free call on somebody else's expense through illegal means, do not have the superaudio signal by the phone of its usefulness and send, no superaudio signal is come on 3,4 lines, and filter LB is output as zero, makes the 5 pin input electronegative potential of N6, and its 7 pin must be electronegative potential.C6 is recharged, and after the time-delay several seconds kind, 5 pin of N3 obtain high potential, and 8 pin also go out high potential, damper work, and the T4 saturation conduction, 3,4 of N4 ends the blocking-up speech channel, and J inhales moving, and 1,2 start sound circuit, send the advice sound; Simultaneously 3,4 of J start show the sign indicating number devices show establish in advance into telephone number; The T6 conducting, warning horn Y rings, warning lamp D17 shell.

The utility model is fine through trial effect, can be widely used on all kinds of cassette telephone sets.

Claims (2)

1, cassette phone burglar alarm mainly is made up of circuit such as sender unit, state detector, time controller, damper, collection of letters controller, the alert device of sound, apparent sign indicating number devices, it is characterized in that: state detector, time controller, damper, the alert device of sound, an apparent sign indicating number device, collection of letters control product are all in same body, installation is connected between switch and the local telephone outside line, puts in main frame or other suitable position.

2, according to the described cassette phone of claim 1 burglar alarm, it is characterized in that: described sender unit is contained in the cassette machine, and the lead-in wire 1,2 of sender unit links to each other with lead-in wire a, the b of cassette machine, and 1,3 lines link to each other with the line that comes of post and telecommunications office's direction.

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