CN2114246U

CN2114246U - Intelligent telephone set with a cipher lock

Info

Publication number: CN2114246U
Application number: CN 92205549
Authority: CN
Inventors: 李幼夫; 林霞
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-02
Filing date: 1992-04-02
Publication date: 1992-08-26

Abstract

The utility model relates to an intelligent telephone with a code lock, which is a code telephone which takes a monolithic special microprocessor as a control kernel. The utility model can arrange user's code according to the telephone line and the relevant information input from a dialing keyboard, and the utility model has the functions of establishing and maintaining talking right grade. The utility model strictly prohibits the knocking stealing use phenomenon of continuous beating on-hook switch for replacing pulse dialing, and meanwhile, the utility model prohibits the audio stealing use phenomenon of using an audio code sender to directly send out code from a microphone. The utility model can compensate for the insufficiency of the existing code lock telephone in many ways.

Description

Intelligent telephone set with a cipher lock

The utility model be a kind of with the monolithic dedicated microprocessor serve as control core the coded lock telephone set.

The well-known application management of strengthening phone with the telephone set that locks is very easy method.But the mechanical lock that prior art is produced zero formula and electronic cipher formula telephone set, ubiquity that restricted area is single, password is simple and easy to shortcomings such as mistake, Change Password difficulty, and can't overcome with pounding on-hook switch, replace knocking of dial-up to usurp phenomenon, with utilize double-tone frequently code sender directly usurp phenomenon from the audio frequency of the outside signaling of microphone, thereby lost the meaning of coded lock phone to a certain extent.

The utility model is a kind of intelligent coded lock telephone set that uses the chip microprocessor chip as the control core that designs in order to overcome deficiency of the prior art.

Principle of the present utility model is with outside dial-up circuit (2) is connected, also with central processing unit circuit (1) and connect at the keyboard input circuit (3) of ordinary telephone set.This just makes the user can be intercepted and captured by circuit (1) simultaneously from the dial-up information of keyboard input, and before dial-up circuit signaling, differentiate and handle, thereby finish the password setting of phone and the differentiation of user's communication hierarchy of power, and relevant information is write electricity wipe in the register circuit (4), in the hope of after on-hook or power down, can keeping, and when off-hook once more, utilize again.Behind telephone subscriber's operation keyboard input circuit (3) input proper password, phone will enter corresponding conversation grade, central processing unit circuit this moment (1) is by intermittently controlling the noise elimination input (12) of talking and receiving circuit (5), the continuous dial change of tune that telephone office side is produced in circuit (11) is interrupted, to produce the rank prompt tone of corresponding different conversation grades, this sound is by sending in receiver (6) or the hand-free loudspeaker (7).When whenever carrying out an off-hook operation, off-hook detection circuit (8) all makes circuit (1) reset immediately, the line delay of going forward side by side starts, time of delay must be greater than the signaling cycle of the fixed maximum individual pulse of telephone office's square gauge, to forbid the pounding phone on-hook switch fast, replace knocking of pulse dial-up to usurp operation.The effect of ring detecting circuit (9) then is whether to produce external bell signal according to phone before off-hook, generate a corresponding logic level, circuit (1) determines whether microphone input (13) by talking and receiving circuit (5) according to the state of this logic level behind off-hook, the audio frequency input of sealing microphone (10), stop thus when ring off-hook not, utilize double-tone frequently code sender usurp operation from the audio frequency that microphone (10) replaces double-tone to carry out signaling frequently.See Fig. 1.

The utility model compared with prior art has following advantage:

1. can stop the repeating transmission that utilizes retransmit operation or pound on-hook switch and use the dual-tone dialing device to carry out to usurp, knock to usurp and usurp with audio frequency.

2. strict fast authority is differentiated, can not produce any infecctive call in the side of playing a game.

3. can set up a plurality of conversation grades, password itself is selected by keyboard flexibly and easily by user oneself.

4. can carry out power down to the conversation grade and keep, and utilization office side dialing tone produces the rank prompt tone.

5. the repertoire that has kept original telephone set network.

The drawing of the utility model accompanying drawing is described as follows:

Fig. 1 is the electric principle schematic of utility model.(1) is that central processing unit circuit (2) is the dial-up circuit among the figure, (3) be the keyboard input circuit, (4) are that electricity is wiped register (E2PROM) circuit, and (5) are talking and receiving circuits, (6) be telephone receiver, (7) be the telephone set hand-free loudspeaker, (8) are the off-hook detection circuit, and (9) are ring detecting circuits, (10) be phone transmitter, (11) be telephone line, (12) are the noise elimination inputs of circuit (5), and (13) are the microphone inputs of circuit (5).

Fig. 2 is embodiment circuit theory diagrams of the present utility model.Make additional remarks below in conjunction with present embodiment.

Circuit (1) at embodiment is made up of a slice 80C51 singlechip chip, clock frequency 3.579MHz, when button on keyboard, the anti-shake time of circuit (2) is 23 milliseconds, and circuit (1) is then finished the differentiation of button within this time and handled it.Off-hook detection circuit (8) is after electric resistance partial pressure and voltage-stabiliser tube clamper, again through shaping, differential and produce the reset signal of circuit (1), the late continuous time of this reset signal is to be formed by the pulse duration of differential circuit and program software time-delay, in the present embodiment greater than 200 milliseconds.Ring detecting circuit (9) in the present embodiment with the shared electric capacity of universal telephone ringing circuit ML8024 every the direct sum bridge rectifier, become DC level after the bell signal rectification, be maintained on the capacitor C, and discharge by resistance R, the level of this variation is detected by circuit (1) after shaping again.The time constant of RC needs the maximum ring blanking time greater than telephone office, and present embodiment got for 3 seconds.Two outputs of circuit (1) are the break-makes by two switch triodes, and control signal end (13), (12) are short circuit over the ground, finish the sealing of microphone and the effect of intermittently controlling dialing tone.

Claims

1, a kind of intelligent cipher lock telephone set is characterized in that, central processing unit circuit (1) is connected keyboard input circuit (3) jointly with dial-up circuit (2), make circuit (1) differentiate and handle to the information of keyboard (3) input, with the password setting of finishing phone and the foundation of conversing hierarchy of power, and these information are write electricity wipe in the register (4), in the hope of after power down, keeping.

2, it is characterized in that according to the coded lock telephone set in the claim 1, central processing unit circuit (1) is by intermittently controlling the noise elimination input (12) of talking and receiving circuit (5), the continuous dial change of tune that telephone office side is produced in circuit (11) is interrupted, producing the rank prompt tone of corresponding different conversation grades, and by sending in receiver (6) or the hand-free loudspeaker (7).

3, it is characterized in that according to the coded lock telephone set in the claim 1, when whenever carrying out an off-hook operation, off-hook detection circuit (8) all makes circuit (1) reset immediately, and carry out delay start, this time of delay is greater than the fixed maximum individual pulse signaling cycle of telephone office's square gauge, to prevent the beaing on-hook open and close fast, replace the operation of usurping of pulse signaling.

4, it is characterized in that according to the coded lock telephone set in the claim 1, by ring detecting circuit (9) according to whether producing bell signal before the off-hook, generate a logic level, circuit (1) is then according to the state of this level, determine whether audio frequency input by microphone input (13) the sealing microphone (10) of talking and receiving circuit (5), to stop when the ring off-hook not, utilize double-tone frequently code sender replace the take place frequently operation of usurping of sign indicating number of double-tone from microphone (10).