CN1061497C

CN1061497C - Automatic dialling device for telephone

Info

Publication number: CN1061497C
Application number: CN94113108A
Authority: CN
Inventors: 伍尚魁; 陈继平
Original assignee: XIANGTAN NEW PRODUCT DEVELOPMENT RESEARCH INST HUNAN XUNDA GROUP
Current assignee: XIANGTAN NEW PRODUCT DEVELOPMENT RESEARCH INST HUNAN XUNDA GROUP
Priority date: 1994-10-22
Filing date: 1994-10-22
Publication date: 2001-01-31
Anticipated expiration: 2014-10-22
Also published as: CN1121667A

Abstract

The present invention relates to an automatic dialing device of a telephone. The automatic dialing device overcomes the defect that the existing automatic dialing device of the telephone has complicated circuits. The automatic dialing device is composed of a signal switch circuit 1, a testing circuit 2, a hand free switch circuit 3, a starting circuit 4, a line-receiving control circuit 5 and a redialing control circuit 6. Busy tones and ring back signals on a signal line are recognized by the testing circuit 2, and thus, the automatic dialing device controls the line-receiving control circuit 5 to output a line-receiving signal, controls the redialing control circuit 6 to output a redialing signal, and controls the hand free switch circuit 3 to be communicated with a hand free key of the telephone. The automatic dialing device has the advantages of simple circuit and reliable work. After the telephone number is dialed by the subscriber once, the telephone number can be continuously and automatically dialed until getting through, which is convenient for the subscriber to use the telephone.

Description

Automatic dialling device for telephone

The present invention relates to the telephone set in a kind of communication system, particularly a kind of automatic dialling device for telephone device.

Along with the continuous increase of traffic, the phenomenon that the line is busy is more and more serious.The telephone set that uses has had manual redialing function at present, but it still can not satisfy people's demand, because under the situation that the line is busy, whenever pull out number one time, all need take-up, press redial key then, so just bring a lot of inconveniences to the user, wasted the time, thereby people have expected that development has the telephone set of automatic re-dialing function, but it all there is being a time interval between each auto redial sign indicating number, the design of this blanking time allows external call to call in and stay, and heavily pull out all is under hands-free state at every turn, and telephone set sends the sound that heavily pulls out, and this sound influences user and people's operate as normal on every side, too complicated as its circuit of Chinese patent disclosed " patent No. is 932335489; the telephone automatic dialing machine ", the manufacturing cost height is difficult to apply.

The object of the present invention is to provide a kind of simple in structurely, can constantly heavily pull out until the automatic dialling device for telephone of putting through automatically.

The objective of the invention is to realize: a kind of automatic dialling device for telephone by following approach, the break-make that is serially connected in control switch triode T1 between the base stage of switch triode T1 and the ground by the collector and emitter of switch triode T2 constitutes start-up circuit 4, the emitter of the base stage triode T1 of the switch triode T2 hook switch line of answering the call, the supply voltage from the collector electrode output phone hook switch line of switch triode T1 offers signal switching circuit 1, testing circuit 2, hands-free switching circuit 3, take-up control circuit 5, redials control circuit 6;

Signal switching circuit 1 is to be connect the collector electrode of switch triode T7 and meet switch triode T7 and base stage constitutes behind resistance R 16 serial connection diode D4 through resistance R 15 by the output of the Q of flip-flop circuit IC1 end;

The waveform shaping circuit that testing circuit 2 is made up of switch triode T9 and T8 divides two tunnel outputs after with the signal shaping on the telephone signal line, one road signal exports the CP end of flip-flop circuit IC4 to through the switch triode T7 of signal switching circuit 1, export the D end of flip-flop circuit IC5 to from the Q end of flip-flop circuit IC4, the Q end of flip-flop circuit IC4 exports the CP end of flip-flop circuit IC6 to, another road signal of waveform shaping circuit output is to the CP end of flip-flop circuit IC5, the Q end of flip-flop circuit IC5 exports the R end of the flip-flop circuit IC1 in the signal switching circuit 1 and the base stage of take-up control circuit 5 switch triode T4 to, the Q of flip-flop circuit IC5 end outputs to the D end of IC6 and redials the CP end of the bistable delay circuit IC2 in the control circuit 6, exports the base stage of switch triode T6 the hands-free switching circuit 3 and the R end of the flip-flop circuit IC1 in the signal switching circuit 1 to from the Q end of flip-flop circuit IC6; Hands-free switching circuit 3 is to be made of switch triode T6; Take-up control circuit 5 is to be made of the power on/off phone take-up that the collector and emitter of switch triode T4 connects control switch triode T3 between the base stage of switch triode T3 and the ground; Redialing control circuit 6 is the CP ends that exported to flip-flop circuit IC3 by the Q end of bistable delay circuit IC2, exports the CP end that feeds back to flip-flop circuit IC1 the signal switching circuit 1 from the Q end of flip-flop circuit IC3.Delay circuit is by being connected to resistance R 14 between the Q of flip-flop circuit IC4 end and the R end, being connected to capacitor C 7 and constituting between the R of IC4 end and ground in the testing circuit 2, and the delay time of delay circuit is greater than 0.35 second, and less than 1 second.Be serially connected with switch ANI and resistance R 1 between the base stage of switch triode T2 in the start-up circuit 4 and the telephone set hook switch line, between the base stage of the collector electrode of switch triode T1 and switch triode T2, be serially connected with resistance R 3.

Automatic dialling device for telephone of the present invention matches with the existing telephone machine, after only needing the user to dial telephone number, when the line is busy it just can be constantly re-dialing telephone number automatically, till putting through, put through the back and remind user's communication by phone hand-free loudspeaker output ringing tone signal, it can be removed the trouble of user's repetitive operation from and save time, increase work efficiency, greatly make things convenient for the user, this device can be contained in the telephone set and the telephone set common board, also can be installed in separately in the box to link with the existing telephone machine.Its adopts the bistable delay circuit in testing circuit to discern the busy-back signal backward signalling automatically, and whether control is heavily pulled out control circuit and exported and heavily pull out signal, so just makes entire circuit simple, and reliable operation reduces manufacturing cost.

The following drawings has provided one embodiment of the present of invention:

Fig. 1 is a circuit block diagram of the present invention;

Fig. 2 is telephone set busy tone and ringing tone signal national standard oscillogram;

Fig. 3 is the circuit theory diagrams of the embodiment of the invention.

Below in conjunction with accompanying drawing the present invention is described in further detail:

As shown in Figure 1, the present invention by signal switching circuit 1, testing circuit 2, hands-free switching circuit 3, start-up circuit 4, take-up control circuit 5, heavily pull out control circuit 6 and form.As shown in Figure 3, signal switching circuit 1 is made up of bistable trigger IC1, resistance R 15 and R16, diode D4 and D5, switch triode T7.Testing circuit 2 is by capacitor C 10, C9, C8, C7, C6, C5, resistance R 19, R18, R17, R14, R13, R12, triode T9, T8, diode D7, D6, D3, D2; D1, bistable trigger IC4, IC5, IC6 form.Hands-free switching circuit 3 is made up of resistance R 11 and triode T6.Start-up circuit 4 is by switch AN1, resistance R 1, R2, R3, R4, and capacitor C 1, triode T1 and T2 form.The take-up control circuit; Be by resistance R 5 and R6, triode T3 and T4 form.Heavily pulling out control circuit 6 is by resistance R 7, R8, R9, R10, capacitor C 2, C3, C4, and triode T5, bistable trigger IC2 and IC3 form.

As shown in Figure 3, this device circuit operation principle is as follows:

When the telephone set hook state, telephone set hook switch line is connected the working power of start-up circuit 4, even also the A point is with positive 5 volts of voltages, when off hook state, the A point is not charged, and entire circuit can not be worked.Under hook state, the A point is with positive 5 volts of voltages, when pressing switch AN1 key, power supply makes triode T2 conducting by resistance R 1, the conducting of triode T2 makes triode T1 conducting, make the B point also be with positive 5 volts of voltages, the Voltage Feedback that resistance R 3 is ordered B again is to the base stage of triode T2, at this moment, after switch AN1 disconnected, triode T1 still was in conducting state, kept the B point that positive 5 volts voltage is arranged, 5 volts of voltages that B is ordered offer signal switching circuit 1, testing circuit 2, hands-free switching circuit 3, take-up control circuit 5, heavily pull out the operate as normal power supply of control circuit 6.When start-up circuit 4 makes the B point that positive 5 volts of voltages be arranged, this voltage signal promptly makes triode T3 conducting by resistance R 5, make telephone set carry out take-up, promptly give connection to external call, B point voltage signal gives the capacitor C on the CP end that is connected to bistable trigger IC2 2 chargings by resistance R 7 simultaneously, make by bistable trigger IC2 and resistance R 8, after the delay circuit time-delay that capacitor C 3 constitutes, CP end from IC2 output high level to bistable trigger IC3, IC3 exports two paths of signals, one road signal is by resistance R 10, make triode T5 conducting, connect the button that redials of telephone set, Outgoing Call number, another road signal make bistable trigger IC1 output high level, this level signal is by resistance R 15 and R16 and diode D4, make triode T7 conducting, thereby make signal switching circuit 1 connect signal on the telephone signal line, make the RST on the testing circuit 2 beginning signal lines to testing circuit 2.The waveform shaping circuit that testing circuit 2 is made up of triode T9 and T8 and peripheral resistance and electric capacity, be divided into two-way after signal shaping on the holding wire become square wave, one tunnel square-wave signal is delivered to the CP end of bistable delay circuit 1C4 through the diode D5 of signal switching circuit 1 and D4 and triode T7, bistable trigger IC4 and resistance R 14, capacitor C 7 constitutes the bistable delay circuit, time constant is designed time constant between 0.55 second to 0.8 second by R14 and C7 decision; Another road square-wave signal is directly delivered to the CP end of bistable trigger IC5.Decline at signal starts IC4, in the purified signal of the D of IC4 termination telephone set.After IC4 started, IC4 output high level was to the D end of IC5, and IC4 while output low level is to the CP end of bistable trigger IC6; If the signal on the holding wire is a busy-back signal, square wave low-level pulse width after its shaping is 0.35 second, rising edge promptly appearred in the time of 0.35 second, as shown in Figure 2, make 1C5 export positive and negative pulse signal, its positive pulse signal resets and output low level IC5 by second revisal pipe D2, thereby makes triode T7 output low level, turn-off the input of IC4, testing circuit 2 is stopped the input on the holding wire.The positive pulse signal of IC5 output also makes triode T4 conducting by resistance R 6, and triode T3 is ended, and T3 is by just telephone set being carried out take-up work.The undersuing of IC5 is by diode D3, make capacitor C 2 discharges, and then charging, after delaying time by IC2 this moment, start IC3 work output two paths of signals, one road signal makes triode T5 conducting by resistance R 10, that connects telephone set heavily pulls out button, and Outgoing Call number, another road signal make IC1 output high level, make triode T7 conducting, from and make RST on the testing circuit 2 beginning signal lines.Detect so repeatedly and export and heavily pull out signal, take on the telephone until pulling out.If the signal on the holding wire is a ringing tone signal, then rising edge just appearred in pulse signal in the time of 1 second, as shown in Figure 2, and because the timing of IC4 has only 0.55 second to 0.8 second, so before the pulse signal rising edge arrives, IC4 between the period of the day from 9 a.m. to 11 a.m. to and reset, output low level to the D of IC5 end can not be worked IC5, and the high level of IC4 output is to the CP end of IC6.IC6 receive by IC4 send by low level to high level signal, IC6 works and sends positive pulse signal, this positive negative pulse stuffing signal makes triode T6 conducting by resistance R 11 on the one hand, connect the hands-free button of telephone set, make telephone set be in hands-free state, the positive pulse of IC6 output resets Ic1 by diode D1 again on the other hand, the IC1 output low level, triode T7 is ended, and its output is a low level, turn-offs the input of IC4, testing circuit 2 is stopped the input on the holding wire, and not recirculation dialing, at this moment, telephone set on outside line is in talking state.

Bistable trigger IC4 in the automatic dialling device for telephone circuit of the present invention and IC2 can substitute with timing circuit, as substituting with 555 time-base circuits.

Automatic dialling device for telephone of the present invention owing to cancelled the stand-by period, thereby has the ruthless pre-emption function between heavily pulling out, saved the dialing stand-by period widely, has greatly improved efficient, has made things convenient for the user.

Claims

1. automatic dialling device for telephone is characterized in that:

The break-make that is serially connected in control switch triode T1 between the base stage of switch triode T1 and the ground by the collector and emitter of switch triode T2 constitutes start-up circuit [4], the emitter of the base stage triode T1 of the switch triode T2 hook switch line of answering the call, the supply voltage from the collector electrode output phone hook switch line of switch triode T1 offers signal switching circuit [1], testing circuit [2], hands-free switching circuit [3], take-up control circuit [5], redials control circuit [6];

Signal switching circuit [1] is to be connect the collector electrode of switch triode T7 and meet switch triode T7 and base stage constitutes behind resistance R 16 serial connection diode D4 through resistance R 15 by the output of the Q of flip-flop circuit IC1 end;

The waveform shaping circuit that testing circuit [2] is made up of switch triode T9 and T8 divides two tunnel outputs after with the signal shaping on the telephone signal line, one road signal exports the CP end of flip-flop circuit IC4 to through the switch triode T7 of signal switching circuit [1], export the D end of flip-flop circuit IC5 to from the Q end of flip-flop circuit IC4, the Q end of flip-flop circuit IC4 exports the CP end of flip-flop circuit IC6 to, another road signal of waveform shaping circuit output is to the CP end of flip-flop circuit IC5, the Q end of flip-flop circuit IC5 exports the R end of the flip-flop circuit IC1 in the signal switching circuit [1] and the base stage of take-up control circuit [5] switch triode T4 to, the Q of flip-flop circuit IC5 end outputs to the D end of IC6 and redials the CP end of the bistable delay circuit IC2 in the control circuit [6], exports the base stage of switch triode T6 hands-free switching circuit [3] to and the R of the flip-flop circuit IC1 in the signal switching circuit [1] holds from the Q end of flip-flop circuit IC6;

Hands-free switching circuit [3] is to be made of switch triode T6;

Take-up control circuit [5] is to be made of the power on/off phone take-up that the collector and emitter of switch triode T4 connects control switch triode T3 between the base stage of switch triode T3 and the ground; Redial control circuit [6] and be the CP end that exports flip-flop circuit IC3 by the Q end of bistable delay circuit IC2 to, from the Q end output of flip-flop circuit IC3 instead to the signal switching circuit [1] the CP of flip-flop circuit IC1 hold.

2. automatic dialling device for telephone according to claim 1, it is characterized in that delay circuit in the testing circuit [2] is by being connected to resistance R 14 between the Q end of flip-flop circuit IC4 and the R end, being connected to capacitor C 7 between the R of IC4 end and ground constitutes, the delay time of delay circuit is greater than 0.35 second, and less than 1 second.

3. according to the described automatic dialling device for telephone of claim 1, it is characterized in that being serially connected with switch ANI and resistance R 1 between the base stage of the switch triode T2 in the start-up circuit [4] and the telephone set hook switch line, between the base stage of the collector electrode of switch triode T1 and switch triode T2, be serially connected with resistance R 3.