CN2156632Y - Automatic telephone calling security limiter - Google Patents
Automatic telephone calling security limiter Download PDFInfo
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- CN2156632Y CN2156632Y CN 93205062 CN93205062U CN2156632Y CN 2156632 Y CN2156632 Y CN 2156632Y CN 93205062 CN93205062 CN 93205062 CN 93205062 U CN93205062 U CN 93205062U CN 2156632 Y CN2156632 Y CN 2156632Y
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Abstract
The utility model discloses an automatic telephone calling encryption limiter, which is used for carrying out encryption limitation for the call of a pulse type automatic telephone. The utility model is composed of an interface circuit, a time sequence generating control circuit, a central processing circuit, an under voltage warning circuit, a numerical selection digit control circuit and an executive circuit. The utility model which is connected into the telephone line in a parallel mode not only can be arranged at the inner part of the telephone, but also can be arranged on the telephone line singly. The utility model not only controls a single telephone, but also carries out encryption control for the call of all the telephones connected to the telephone line, which effectively overcomes the defects existing in the prior art and has the advantages of flexible use, wide application, high reliability, low cost, easier commercialization, etc.
Description
The utility model relates to a kind of automatic telephone that is used for and prevents without permission calling or the false device of calling out, and particularly a kind of automatic telephone is breathed out and encrypted limiter.
CN2037904U discloses a kind of pulse push-button telephone numeral limiter of raising the price, it is made of pulse detection link, counting link, differentiation link, state memorization link and limiting element, controlled by pulse-generating circuit telephone set, realization is to the restriction of raising the price of phone directory machine, the described limiter of raising the price is made of the CMOS integrated package, it can be to the restriction of raising the price of direct dialing or local telephone, simultaneously special phones such as 119,110 is acted on without limits.This technical scheme is analysed in depth, and can find out obviously that there is following defective in it: (1) can only be installed in key pulse formula telephone set inside, and repacking is comparatively complicated; (2) can only be as a kind of additional function modules (circuit) of certain electric phone, no general applicability; (3) only the telephone set that this device is installed can be controlled, control can not be realized multi-section telephone set on a certain telephone wire; (4) read and comparator device between separate, the counting link, to differentiate devices such as link overlapping.
The purpose of this utility model provides a kind of automatic telephone exhalation and encrypts limiter, it inserts in the telephone wire in parallel, both can be installed in telephone set inside, also can be arranged separately on the telephone wire, it is not as a kind of additional function modules of certain electric phone (circuit), thereby has a general applicability, after inserting telephone wire, and not only control certain single telephone set, but all breathe out and encrypt control being connected all telephone sets on this telephone wire, its read-out device and comparator device are shared, have saved used components and parts, its shape, structure or its are in conjunction with having proposed a kind of practical new technical scheme that is suitable for.
The concrete formation that realizes the utility model above-mentioned purpose is: automatic telephone is breathed out and is encrypted limiter, restriction is encrypted in the exhalation that is used for paired pulses formula automatic telephone, comprise and reading and comparator device that the outstanding difference of itself and prior art is: it is made up of interface circuit, timing sequence generating and control circuit, central processing circuit, under-voltage acknowledge circuit, numerical selection figure place control circuit and executive circuit.Interface circuit is connected with executive circuit, timing sequence generating and control circuit, numerical selection figure place control circuit, timing sequence generating and control circuit are handled the signal of being sent here by interface circuit, central processing circuit is accepted the signal that produces from timing sequence generating and control circuit, numerical selection figure place control circuit, under-voltage acknowledge circuit, sends into executive circuit after the processing.
Interface circuit with simple parallel way access telephone wire in the automatic telephone exhalation encryption limiter is to be made of bridge-type directional circuit, low-impedance device, current limiting device, clamps and voltage-stabilizing device, executive circuit directly inserts the output of bridge circuit by low-impedance device, after 〉=20 seconds time, recover the status signal of interface circuit output Be Controlled phone.Timing sequence generating and control circuit are amplified, automatically reset and put number/count control circuit and form by pulse, central processing circuit is made up of diode matrix container, binary subtraction/adder and pulse count distributor, is read code data in order, can be changed code data by switch by presettable counter.Numerical selection figure place control circuit is made of counter, under the control of central processing circuit, the numerical selection figure place is counted, surpass when setting figure place, output signal, under-voltage acknowledge circuit is to be made of voltage comparator, voltage reference circuit, resistor voltage divider circuit, when supply voltage is lower than set point, sends signal.
F1--F8 is LM339 low-power consumption four voltage comparators;
N1--N6 is the CC4069 hex inverter;
A1--A4 is CC4081 42 inputs and door;
CC4516 can preset 4 binary add/down counters;
CC4022 octal representation/distributor;
CC4017 decimal system counting/distributor
Accompanying drawing 1 constitutes a complete embodiment of the present utility model, below in conjunction with drawings and Examples in detail the utility model is described in detail: the interface section is made up of D1～D6, R1～R2 and R47, diode D1～D4 forms the bridge-type directional circuit, assurance device can be regardless of under the electropolar situation of phone feeder line and insert, R1 is low-impedance resistance, when the line is busy by force, directly inserted telephone line.R2 is a current-limiting resistance, and after it had guaranteed the telephone set on-hook, the electric current that flows through it was about 1mA.D5 is a clamp diode, and it makes that behind the phone off-hook, the input impedance of this interface becomes approximates infinity.D6 and R47 are the voltage stabilizing parts, and it remains on the metastable amplitude dislodging machine signal, numerical selection signal and the bell signal etc. of next circuit of input.
Voltage comparator F1 and attached capacitance resistance ware thereof are formed pulse amplifier, the Weak pulse signal of being sent here by interface circuit is amplified to amplitude almost to be equated with supply voltage, certain denoising effect is also arranged simultaneously, F2 and N5 and attached Resistor-Capacitor Unit thereof are formed automatic reset circuit, when the telephone set off-hook, phone through one section time-delay after, its output becomes high level by low level, and is anti-phase through N5, and the output of N5 then becomes low level by high level, at this moment whole device enters readiness, when the telephone set on-hook, circuit through one section time-delay after, its output transfers low level to, the output of N5 transfers high level to, and whole device enters into reset mode.F3 and its attached discrete device constitute puts number/count control circuit, and when the numerical selection pulse was sent here, its output became low level by high level immediately, just became count status by putting number state.After the pulse in the past, its output becomes high level after one section time-delay.The delay time of reset circuit is more longer than the delay time of putting number/count control circuit, the misoperation of anti-locking apparatus, and above-mentioned two timing sequence generating circuit have been controlled the job step of whole device.Pulse signal through amplifying after the anti-phase shaping of N6, is given CC4516 and is made data.
Central processing portion mainly is made up of CC4516, CC4022, A3 and A4 etc., CC4516 is the core of this device, it finishes data task relatively, CC4022 is as the data address pointer, A3 and attached device thereof are formed triggering License Status latch, and A4 and its attached capacitance resistance ware are formed password input error status latch.Behind the telephone set off-hook, CC4516 is under the control of sequence circuit, insert one by rationed the power supply words number the prefix data, as 1010, when telephone set sent the first string numerical selection data, the rising edge of a pulse of being sent here by N6 subtracted each other with the data of inserting among the CC4516 and (also can be designed to addition, its principle is identical, as long as concrete numeral is changed a little.), according to the difference of numerical selection data, have two kinds of situations to occur:
(1) equates with data among the CC4516, then Qco becomes low level, next string data arrives still for some time, the delay circuit that this signal is formed through devices such as N2 and N3, the EN terminal of CC4022 is become low level, and at this moment the rising edge that sends of F3 makes CC4022 add 1, and data address pointer CC4022 points to second data 0110, these data also are placed among the CC4516 simultaneously, and A3 also is changed to License Status--high level.
(2) with CC4516 in data unequal, also be divided into two kinds of different situations:
1. less than 1010, Qco does not become low level, under the driving of the rising edge that F3 sends, through and devices such as door A2, differential circuit C5 and R27, make the latch output of composition such as A4 become high level.
2. greater than 1010, Qco be low level in very short time only, and during this period of time F3 does not also send rising edge, thereby can not constitute and make CC4022 add 1 condition, moves described in 1. later on.
Numerical selection figure place control circuit mainly is made of CC4017, finish following function under the cooperation of other interlock circuit: from controlled telephone set by off-hook until the whole process of on-hook, as the first item sign indicating number that occurs extracting and first byte in the container are inequality, then all will count after this dialing number of times (figure place just), after surpassing a certain set point, just send control signal, forbid that controlled telephone set continues to breathe out.This moment K switch
1-1Must be in shown in the figure on the position, just can work, below this switch of hypothesis is positioned at shown in the figure on the position.When controlled telephone set is in hook state, deliver to the C of CC4017 by the reset signal of timing sequence generating and control circuit generation
rTerminal, CC4017 thereby be cleared is in initial standby condition, decoding lead-out terminal Y
9Be low level; Behind controlled telephone set off-hook, the C of CC4017
rTerminal becomes low level, but because the CP terminal of the latch of compositions such as A4 control is in low level, so CC4017 still will not respond the signal of being sent into by other terminal.In case the latch of compositions such as A4 output becoming high level, then the CP terminal by the CC4017 that is attached thereto activates CC4017, and begin the pulse trailing edge of being sent into by its EN terminal is counted, the signal of sending into EN is that timing sequence generating and control circuit generate, and when the Qco terminal of CC4516 was high level, this signal could be by importing with door A2.After the trailing edge of sending into is greater than 9, Y
9Terminal output becoming high level, make the latch set that A3 etc. forms, again because the latch that A4 etc. form output be high level already, and by form by D15, D16, D17 and R30 etc. or send, executive circuit just is triggered like this, thereby has realized the control to the dialing figure place.
After the output of the latch of compositions such as A4 becomes high level, make the CI terminal of CC4516 become high level, blocked the data input of sending by telephone set, thereby this device has just been abandoned the test to telephone set numerical selection data, but because CC4017 is in count status at this moment, thereby still detects the dialing number of times, when the time greater than 9 times, Y9 exports high level, and then makes the latch set of compositions such as A3.This promptly is the numerical selection figure place controlling Design of CC4017, and is correct as first data of input, just must import four passwords 6421, as long as in the input data mistake is arranged, all will make the trigger set of compositions such as A4.Correct as whole inputs, then the Y5 terminal of CC4022 becomes high level, in blocking data input CC4516, can not be set through the latch of compositions such as the anti-phase A4 of making of N4.The read-only container that diodes such as D23, D24, D25 and D26 are formed constitutes the diode matrix storing mode, as long as change their content, password also changes thereupon.
Operating part is made up of F6, F7, F8, N1 and A1 etc., and its task mainly is to finish the function of off-hook by force.When latch set that A3 etc. forms, the input of executive circuit is just open, form by D15, D16, D17 and R30 etc. or door when being output as high level, the monostable circuit of forming by devices such as F6, just be triggered, the output of F6 becomes high level, and the output of F1 then becomes low level from high level, thereby has blocked the input of F2.Reset signal can not be produced, meanwhile, the output of F8 becomes high level by low level, at this moment T2 whether work form by F4 etc. or the door decision, as long as A4 output is that high level or supply voltage are lower than 3 volts, then the electronic switch of composition such as T2 is opened, and R1 is merged in the telephone wire, cause the off-hook effect, make telephone set can't send the sufficiently high numerical selection pulse of amplitude.Otherwise T2 is not opened, and this device will not respond the telephone set state fully in transient state time, thereby, can freely breathe out, after transient state finishes,, then install and resetted comprehensively as phone on-hook.
Under-voltage acknowledge circuit is by voltage comparator F5(LM339), comprise the voltage reference circuit that D9, T1, R20 and R21 form and constitute the resistor voltage divider circuit of forming by R22, R23 and C4, when ambient temperature is 20 ℃, the warning threshold voltage is set at 3 volts.When under-voltage warning, both made the password of input correct, telephone wire also can be in off hook state by force, so the user can find comparatively in time that battery is under-voltage, the possibility of failure of apparatus is greatly reduced.Use the power supply of three joint R20 batteries as this device, K switch is a functional select switch among the figure, Yi Bian be automatic long-distance restriction, another side is the full limit of breathing out.
In the technique scheme, LM339 can be by any voltage comparator, and operational amplifier is replaced; CC4069 can be replaced by any not gate, NAND gate, schmidt trigger inverter; CC4081 can replace with door with any; CC4516 can be replaced by any presettable counter; CC4022 can be replaced by any ring counter; CC4017 can be replaced by any counter.
The technical scheme that the utility model proposes, not only effectively overcome the defective that the aforesaid prior art of this paper exists, realized preferably aforementioned purpose of the present invention, and have use flexible, widely applicable, function is strong, reliability is high, cost low and the advantage such as easier commercialization.
Claims (6)
1, a kind of automatic telephone is breathed out and is encrypted limiter, restriction is encrypted in the exhalation that is used for paired pulses formula automatic telephone, comprise and reading and comparator device, it is characterized in that: it is by interface circuit, timing sequence generating and control circuit, central processing circuit, under-voltage acknowledge circuit, numerical selection figure place control circuit and executive circuit are formed, interface circuit and executive circuit, timing sequence generating and control circuit, numerical selection figure place control circuit connects, timing sequence generating and control circuit are handled the signal of being sent here by interface circuit, central processing circuit is accepted from timing sequence generating and control circuit, numerical selection figure place control circuit, the signal that under-voltage acknowledge circuit produces is sent into executive circuit after the processing.
2, a kind of automatic telephone according to claim 1 is breathed out and is encrypted limiter, it is characterized in that: the interface circuit that inserts telephone wire with simple parallel way is to be made of bridge-type directional circuit, low-impedance device, current limiting device, clamps and voltage-stabilizing device, executive circuit directly inserts the output of bridge circuit by low-impedance device, after 〉=20 seconds time, recover the status signal of interface circuit output Be Controlled phone.
3, a kind of automatic telephone according to claim 1 is breathed out and is encrypted limiter, it is characterized in that: timing sequence generating and control circuit are amplified by pulse, automatically reset and put number/count control circuit and form, voltage comparator F1(LM339) and attached capacitance resistance ware form pulse amplifier, the Weak pulse signal of being sent here by interface circuit is amplified to amplitude almost to be equated with supply voltage, F2(LM339) and N5(CC4069) and attached capacitance resistance ware form automatic reset circuit, F3(LM339) and its attached discrete device constitute and put number/count control circuit, when the numerical selection pulse is sent here, its output becomes low level by high level immediately, just become count status by putting number state, the delay time of automatic reset circuit is greater than the delay time of putting number/count control circuit.
4, a kind of automatic telephone according to claim 1 is breathed out and is encrypted limiter, it is characterized in that: central processing circuit comprises the matrix container of being made up of many diodes, CC4516, CC4022, A3(CC4081) and attached device the triggering License Status latch and the A4(CC4081 that form) and the password input error status latch formed of attached device constitute, CC4516 under the control of sequence circuit, insert one by rationed the power supply words number the prefix data, when telephone set sends the first string numerical selection data, by N6(CC4069) rising edge of a pulse sent here, subtract each other or addition with the data of inserting among the CC4516, the result of data comparison will make A3(CC4081) or output A4(CC4081) become high level.
5, a kind of automatic telephone according to claim 1 is breathed out and is encrypted limiter, it is characterized in that: numerical selection figure place control circuit is made up of CC4017 and attached device thereof, after the output of the latch of compositions such as A4 becomes high level, make the CI terminal of CC4516 become high level, blocked the data input of sending by telephone set, thereby this device has just been abandoned the test to telephone set numerical selection data, but because CC4017 is in count status at this moment, thereby still the dialing number of times is detected, when greater than 9 times, Y9 exports high level, and then makes the latch set of compositions such as A3.This promptly is the numerical selection figure place controlling Design of CC4017, and is correct as first data of input, just must import four passwords, as long as in the input data mistake is arranged, all will make the trigger set of compositions such as A4.Correct as whole inputs, then the Y5 terminal of CC4022 becomes high level, in blocking data input CC4516, can not be set through the latch of compositions such as the anti-phase A4 of making of N4.
6, a kind of automatic telephone according to claim 1 is breathed out and is encrypted limiter, it is characterized in that: under-voltage acknowledge circuit is by voltage comparator F5(LM339), comprise the voltage reference circuit that D9, T1, R20 and R21 form and constitute the resistor voltage divider circuit of forming by R22, R23 and C4, when supply voltage is lower than set point, send signal; K switch is a functional select switch, Yi Bian be automatic long-distance restriction, another side is the full limit of breathing out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93205062 CN2156632Y (en) | 1993-03-01 | 1993-03-01 | Automatic telephone calling security limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93205062 CN2156632Y (en) | 1993-03-01 | 1993-03-01 | Automatic telephone calling security limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2156632Y true CN2156632Y (en) | 1994-02-16 |
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ID=33788434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93205062 Expired - Fee Related CN2156632Y (en) | 1993-03-01 | 1993-03-01 | Automatic telephone calling security limiter |
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| Country | Link |
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| CN (1) | CN2156632Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113448275A (en) * | 2021-07-30 | 2021-09-28 | 重庆市农业科学院 | Embedded control greenhouse control system |
-
1993
- 1993-03-01 CN CN 93205062 patent/CN2156632Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113448275A (en) * | 2021-07-30 | 2021-09-28 | 重庆市农业科学院 | Embedded control greenhouse control system |
| CN113448275B (en) * | 2021-07-30 | 2023-05-05 | 重庆市农业科学院 | Greenhouse control system with embedded control |
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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 |