CN1110446A

CN1110446A - Device for testing switching state of telephone hook switch

Info

Publication number: CN1110446A
Application number: CN 94103895
Authority: CN
Inventors: 吴瑞光; 陈茂松; 吴孟仓
Original assignee: Winbond Electronics Corp
Current assignee: Winbond Electronics Corp
Priority date: 1994-04-09
Filing date: 1994-04-09
Publication date: 1995-10-18
Anticipated expiration: 2014-04-09
Also published as: CN1055813C

Abstract

The present invention relates to a detection device for detecting hook switch state, including a timing device, a control circuit and a counter. Said invention can prevent the abnormal pulse produced by phone hook switch from receiving by exchanger, and can prevent the error of correct number transfer and toll lock control from disrupting.

Description

Device for testing switching state of telephone hook switch

The present invention relates to a kind of hook switch checkout gear, refer to a kind of device for testing switching state of telephone hook switch especially.

For the switch that can accept pulsed (PULSE MODE) signal, as long as disconnected with the logical ratio (Make-Break-ratio) of the dialing frequency (Dial Rate) of signal and signal correctly on the line, switch can be accepted this pulse signal; As shown in Figure 1, HKSW is the pulse condition of phone hook switch (HOOK Switch), when HKSW is " Low " (low), the expression microphone is picked up, be " OFF HOOK " that when HKSW was " High " (height), the expression microphone was put back to phone, be " ON HOOK " that DP represents that then phone delivers to the pulse signal of switch; Frequency=the 1/Tf that wherein dials, and disconnected with logical ratio=Tm/Tb; The numeral that DP exported in Fig. 1 is 3,2.

Please consult Fig. 2 again, if by the user control switch hook extension, pluck (ON, OFF), just microphone is picked up, is put down, or press switch hook with hand, can make the signal of HKSW identical equally with DP; Yet it is this non-by the pulse that number produced of user by keyboard or rotating disk input, still can be accepted by switch, at phone now except call function, still have under the situation of lock control, password identification or the like, this kind destroyed the normal use of phone widely by the pulse signal that HOOK produced.

In the phone lock control system, the phone of a lock " 0 " for example, as long as it is 0 that phone one detects the number of keyboard input, then number thereafter is with regard to complete failure, do not exported by telephone set, yet there is the user to utilize the extension of switch hook to pluck the pulse signal that generation one is same as " 0 ", again continue the number of input afterbody thereafter, then because should " 0 " be not to import by keyboard, so phone can't detect, accept because of the pulse signal that is somebody's turn to do " 0 " also can be switch again, receive so this user can make the right number of its desire input be entirely switch; For example: complete telephone number is (02) 1231231, destroy long-distance lock control system as user's desire, as long as produce a pulse signal identical with switch hook earlier with 0, renew and dial remaining sign indicating numbers such as (2) 1231231,, belong to and dialling in violation of rules and regulations so telephone set can't be discovered it then because should " 0 " produce with switch hook, again because of the pulse signal of the representative " 0 " that this switch hook produced with directly identical by the keyboard importer, so it also can be switch and receives, thus, lock control system promptly is cracked.

Main purpose of the present invention is to provide a device for testing switching state of telephone hook switch, and switch receives the number by telephone keypad or dial input only.

Another object of the present invention is to provide a device for testing switching state of telephone hook switch, prevent that the phone lock control system from being cracked.

The present invention is a kind of device for testing switching state of telephone hook switch, this phone has a hook switch, and this hook switch produces a pulse signal because of the extension of this phone institute tool microphone/pluck, this checkout gear is used to detect the pulse that this phone hook switch is produced, and it comprises: a timer, its output one signal after at least a time interval of counting; One control circuit, it detects high/low state and this signal of the pulse that this hook switch produces, judge whether this phone is normally used, and when judging that this phone is normally used, send one and remove signal, and send an activation signal during by undesired uses in this phone; One counter, when activating signal, this produces carry in receiving, and when carry progression to a reference value counted, make this control circuit carry out the dialing invalid action, and the count results that will add up when receiving this removings mark removing is 0, so that this phone can both normally be used.

Certainly, the present invention also comprises a tabular value (Table), make that people can set arbitrarily that this timer counts respectively should the time interval length and the size of the reference value of this counter thereon.

Certainly, this reference value is pre-stored in this counter.

At least one time interval of this that this timer provided comprises: very first time interval T d1, second time interval Td2, the 3rd time interval Td3 and the 4th time interval Td4.

This control circuit receives after this timer counted the Td3 and the timing result in two time intervals of Td2 in regular turn, and detects under the situation that this switch hook still is maintained at state, is 0 with this counter initialization.

This control circuit promptly detects this switch hook and is become under the state of hook state by off hook state in not receiving this timer as yet when counting up to the timing result of time interval Td2, just activates this timer, makes this timer begin gate time interval T d1.

This control circuit does not detect this switch hook when this timer counts up to the count results of time interval Td1 and has been become by on-hook under the state of off-hook in receiving as yet, just sends this activation signal and gives this counter, makes this counter produce carry.

This control circuit activates this timer in carrying out dialing invalid the time, makes this timer begin gate time interval T d4, and in receiving this timer when passing the timing result of the intact Td4 of timing back, is 0 with this counter initialization.

The invalid line of this phone and switch that is meant of this dialing interrupts (CALL Disconnect).

This dialing is invalid to be meant quiet (MUTE), and its MUTE signal makes voice signal can't be sent phone, makes the user can't hear each other conversation sound.

This phone comprises a dialer, and this device can be located in this dialer, or makes this device become the outer extension wire of this dialer.

The present invention gets following diagram of mat and detailed description, is understood in depth:

Fig. 1: the pulse schematic diagram that switch hook and DP produced under the normal condition;

Fig. 2: switch hook produces the pulse schematic diagram identical with DP under the undesired situation;

Fig. 3: be a preferred embodiment circuit block diagram of the present invention;

Fig. 4: be first kind of coherent pulse schematic diagram of the present invention;

Fig. 5: be second kind of coherent pulse schematic diagram of the present invention;

Fig. 6: be the third coherent pulse schematic diagram of the present invention;

Fig. 7: be the 4th kind of coherent pulse schematic diagram of the present invention;

See also Fig. 3, it is one of the present invention preferred embodiment calcspar, and it comprises: a control circuit 11, a counter 12, a timer 13 and a tabular value 14.Please consult Fig. 4 again, it is the waveform schematic diagram of phone when normally being used, and wherein HKSW represents the extension of switch hook/pluck situation, and HKSW be " High " (height), represents that microphone is put down i.e. " ON HOOK " (on-hook); And HKSW is " Low " (low), and the expression microphone is picked up, and is " OFF HOOK " (off-hook); " DET " represented time interval of institute's timing of timer 13 and the counting situation that counter 12 is added up.

Fig. 3,4 action is as follows: when control circuit 11 detects off-hook, promptly activate timer 13 via signal 111 lines, and timer 13 promptly begins counting, after waiting to count up to a time interval Td3, timer 13 passes through control circuit 11 by the signal 143 of tabular value 14, control circuit promptly sends activation signal 112 and gives counter 12, make counter 12 produce carry, thereafter timer 13 continues timing, when treating timing to Td2, promptly by signal line 142 notice control circuits 11, and control circuit detect this moment switch hook still be maintained at " off-hook " state, promptly send removing signal 113 and give counter 12, it is 0 that counter 12 is removed, and the user can normally use this telephone set dialing.

By the pulse signal of Fig. 4 as can be known, when timer timing during to Td2, hook switch still is maintained at " Low " state, and decidable thus, the user there is no and deliberately makes HKSW cause similar DP(as shown in Figure 2) the undesired behaviour in service of pulse situation.

Please consult Fig. 5 again, it hangs/plucks state for the another kind of switch hook, during off-hook 51 and on-hook 52, its pulse situation is as shown in Figure 4, but when control circuit 11 detects off-hook once more, timer 13 is promptly counted Td3, thereafter the value that added up of counter 12 adds 1, timer 13 continues to count up to Td2, be not counted as yet when finishing at Td2 then, control circuit 11 has promptly detected switch hook and has become on-hook by " off-hook ", so control circuit is promptly by signal line 111, make timer 13 begin to count another kind of time interval Td1, in timer 13 by signal line 141 notice control circuits 11 its behind the intact Td1 of timing, control circuit 11 detects switch hook and still is maintained at " extension " state, the pulse signal that this also represents the user and is not intended to cause similar DP as shown in Figure 2, remove signal 113 so control circuit promptly sends, making the count value of counter 12 is 0 by removing, so that phone can be in the normal dialing state.

See also Fig. 6, because pulse 61 is maintained at the time of Low less than Td2, so counter 12 advances 1, this moment, control circuit 11 activation timers 13 made its time interval Td1 that picks up counting, so in Td1 no count still ends, control circuit 11 has promptly detected switch hook and has become off-hook by on-hook, so it is 0 that counter 12 can not be eliminated, situation is analogized according to this, represent that this user has a mind to utilize switch hook to cause the DP signal of similar Fig. 2, the undesired telephonic intention that makes is arranged, when carry progression to the preset value X of counter 12, counter promptly sends the invalid signal of a dialing and gives control circuit 11, so that control circuit 11 is carried out the dialing invalid action, the execution of this dialing invalid action, can have a multiple different state, for example, DP is forbidden, the line of DP and switch is interrupted, make that switch is unlikely receives this abnormal pulse, or utilize the MUTE(in the phone quiet) signal, should be even use by the abnormal extension of switch hook, the pulse of plucking the similar telephone number that causes can be received by switch and reach on-state, and both sides' caller also can't hear conversation sound each other.Certainly, this preset value X can set the size of its value arbitrarily in the actual behaviour in service of difference.

See also Fig. 7, after control circuit 11 is carried out the dialing invalid action, must person to be used be put back to by microphone, make when the switch hook state is on-hook, control circuit activates timer 13 timing interbody spacer Td4 by signal line 111 again, when finishing Td4 after by signal line 144 notice control circuits 11 in timing, if the time that state continued of on-hook is greater than Td4, the intention of improper this phone of use of expression user's desire is removed, then control circuit 11 is again to remove signal 113, and it is 0 that counter 12 is removed, and all dialing invalid actions will stop, and but telephone system returns to the normal dialing state, so that the next bit user can normally use this phone.

By above description as can be known, the present invention utilizes four kinds of time interval Td1, Td2, Td3, Td4 to come as the frequency that detects the switch hook signal whether the situation generation that is same as dialing frequency (Dial rate) or disconnected with logical ratio (Make-Break-ratio) is arranged, if there is this kind situation to produce, then carry out the dialing invalid action at once, so that switch can't be received the undesired pulse signal that is produced by switch hook, prevented to utilize the extension of switch hook rule/the pluck attempt that cracks long-distance lock control effectively, or because of using switch hook undeservedly, the mistake of the signal that causes output.

Certainly, in order more flexiblely to be applicable to various dialing frequency and disconnected with logical ratio, the present invention is stored in the big or small X of the progression preset reference value of the time span value of Td1, Td2, Td3, Td4 and counter 12 on the tabular value 14, can adjust its value.

The present invention must appoint the personage Ren Shi craftsman who is familiar with present technique to think and be to modify as all, right neitherly takes off the desire protection as attached claim institute.

Claims

1, a kind of device for testing switching state of telephone hook switch, this phone tool one hook switch, and this hook switch produces a pulse signal because of the extension of this phone institute tool microphone/pluck, this checkout gear is used to detect the pulse that this phone hook switch is produced, it is characterized in that described device for testing switching state of telephone hook switch comprises:

One timer, it is output one signal after at least a time interval of counting;

One control circuit, it detects the extension of the pulse that this switch hook produces/pluck state and this signal, judge whether this phone is normally used, and when judging that this phone is normally used, send one and remove signal, and send an activation signal during by undesired uses in this phone;

One counter, when activating signal, this produces carry in receiving, and making this control circuit carry out the dialing invalid action when carry progression to a reference value counted, is 0 and when receiving this removings signal existing count results is removed, so that this phone is in energy normal dialing state.

2, device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, also comprises a tabular value, can set arbitrarily that this timer counts respectively should the time interval length and the size of this reference value thereon.

3, device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this reference value is pre-stored in this counter.

4, device for testing switching state of telephone hook switch as claimed in claim 1, it is characterized in that at least one time interval of this that this timer provided comprises: very first time interval T d1, second time interval Td2, the 3rd time interval Td3 and the 4th time interval Td4.

5, device for testing switching state of telephone hook switch as claimed in claim 4, it is characterized in that, this control circuit receives after this timer counted the Td3 and the timing result in two time intervals of Td2 in regular turn, and detects under the situation that this switch hook still is maintained at off hook state, is 0 with this counter initialization.

6, device for testing switching state of telephone hook switch as claimed in claim 4, it is characterized in that, this control circuit is in not receiving this timer as yet when counting up to the timing result of time interval Td2, promptly detecting this switch hook is become under the state of hook state by off hook state, just activate this timer, make this timer begin gate time interval T d1.

7, device for testing switching state of telephone hook switch as claimed in claim 6, it is characterized in that, this control circuit does not detect this switch hook when this timer counts up to the count results of time interval Td1 and has been become under the state of off-hook by on-hook in receiving as yet, just send this activation signal and give this counter, make this counter produce carry.

8, device for testing switching state of telephone hook switch as claimed in claim 4, it is characterized in that, this control circuit is when the execution dialing is invalid, activate this timer, make this timer begin gate time interval T d4, and in receiving this timer when passing the timing result of the intact Td4 of timing back, be 0 with this counter initialization.

9, device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this dialing is invalid to be the line interruption of this phone and switch.

10, device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this dialing is invalid for utilizing the dumb sound signal of phone, make this phone be in the voice illegal state, and the user can't hear conversation sound each other.

11, device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this phone comprises a dialer, and this device is located in this dialer.

12, device for testing switching state of telephone hook switch as claimed in claim 1 is characterized in that, this device is located at outside this dialer, and exists with the extension wire form of this dialer.