CN2256197Y - Telephone with automatic line interruptor after hanging mouthpiece - Google Patents

Abstract

The utility model relates to a telephone which can be automatically hung up when hung up improperly and can still ring when called in. An automatic hang-up circuit is added in an original telephone structure and is composed of a detecting circuit for electrical signals, a judging circuit for busy tone signals in improper hang-up and a switch circuit executing automatic hang-up action, all in successively connected, wherein, the judging circuit for busy tone signals is composed of a counting circuit, a time-base circuit and an AND logical gating circuit; the signal detecting circuit obtains and shapes signals from a talking circuit of the telephone, and does analysis and judgement via the judging circuit for busy tone signals. If busy tones persist for a certain time, the switch circuit is actuated to act and hang up the circuit.

Description

Prevent the continuous telephone set of on-hook

The utility model relates to a kind of telephone set, relates to a kind of telephone set with automatic hand-up function or rather.

On-hook after user's communication finishes, hook switch should be pressed onto the position fully, can make ringing circuit unobstructed, but the situation of receiver-off-hook often takes place in the practical operation because hook switch is not pressed onto the position fully, make phone can not ring, outside line do not come in, and the user is entirely ignorant of, not only cause delay and mistake, but also can cause unnecessary loss, so on-hook constantly is one and makes the very vexatious very actual again problem of telephone subscriber.

Existing SPC telephone exchange, can from circuit, send busy tone to the telephone set that does not hang up properly, to supervise the user to hang up properly phone, but because this busy tone is to send by the receiver on the phone, volume is very limited, generally do not reach the purpose of reminding the user, therefore can not really solve the continuous problem of on-hook.

The purpose of this utility model is a kind of telephone set with the continuous function of the on-hook of preventing of design, can automatically telephone set be hung up under the situation that subsets do not hang up properly, and outside line can be called in as usual.

The purpose of this utility model is achieved in that on the basis of original call machine structure increases by an automatic hand-up circuit, detects the busy-back signal sent by telephone exchange and inserts in the telephone line by the ringing circuit of executive circuit with telephone set.

The continuous telephone set of on-hook that prevents of the present utility model comprises telephone set network, and described telephone set network includes hook switch, ringing circuit, power circuit and speaking circuit at least, it is characterized in that:

Comprise that also one can prevent the continuous automatic hand-up circuit of on-hook, being linked in sequence by signal deteching circuit, the continuous busy-back signal judging circuit of on-hook and the switching circuit of carrying out automatic hand-up constitutes; The speaking circuit of the described telephone set network of signal deteching circuit input termination, hook switch one end of the described telephone set network of the public termination of switch of the switching circuit of execution automatic hand-up, the ringing circuit and the hook switch other end of the described telephone set network of switch one termination of described switching circuit, the power circuit of the described telephone set network of another termination of the switch of described switching circuit.

The continuous busy-back signal judging circuit of described on-hook comprise counting circuit, time-base circuit and and logic gates, the described signal deteching circuit output of counting circuit counting termination, time-base circuit output and connect the counting circuit clear terminal and with logic gates one input, another input of counting circuit output termination and logic gates.

The switching circuit of described execution automatic hand-up is connected and composed by diode rectification bridge circuit and the transistor relay drive circuit that has from keeping function, diode rectification bridge circuit input is attempted by between described switch common port, hook switch one end and a telephone wire, diode rectification bridge circuit output is succeeded electric apparatus coil one end, described switch common port is the intermediate contact of relay, described switch one end is the moving contact of relay, and the described switch other end is the fixed contact of relay.

The described continuous automatic hand-up circuit of on-hook that prevents also comprises a buzzer circuit, is connected with described busy-back signal judging circuit output.

Described signal deteching circuit is the pulse shaper that is linked in sequence and is constituted by coupling capacitance, voltage stabilizing didoe amplitude limit, diode halfwave rectifier, charge and discharge capacitance and transistor circuit.

Signal deteching circuit is obtained signal and is put processing in order from the speaking circuit of telephone set network, carry out analysis and judgement by the continuous busy-back signal judging circuit of on-hook, if busy-back signal and continued the regular hour, then drive the switching circuit action of carrying out automatic hand-up, telephone set is hung up.

Further specify technology of the present utility model below in conjunction with the embodiment accompanying drawing.

Fig. 1 prevents the automatic hand-up schematic diagram of the continuous telephone set of on-hook.

Fig. 2 prevents the theory diagram of the continuous telephone set of on-hook.

Fig. 3 prevents the enforcement circuit diagram of the continuous telephone set of on-hook.

Referring to Fig. 1, the continuous automatic hand-up circuit 20 of prevented on-hook for increasing in the frame of broken lines, frame of broken lines then is outward the plain old telephone machine circuit.

P1, P2 are the outside lines of circuit machine, and K is a switch hook, and bell S and C1 constitute the ringing telephone stations circuit, and transmitter MIC, transformer T1, receiver SP constitute the telephone set speaking circuit, and diode rectifier bridge constitutes the telephone power circuit.During normal on-hook, switch hook K is in the K1-3 position and disconnects speaking circuit and connect ringing circuit.Ring user off-hook when calling, switch hook jump to the K1-2 position and disconnect ringing circuit, by the fixed contact J1-2 connection speaking circuit of automatic hand-up circuit 20.If do not hang up properly phone, switch hook did not have rebound K1-3 position and still is in the K1-2 position when on-hook was finished in conversation, and the busy-back signal that stored-program control exchange is sent here send speaking circuit by J1-2.Carry out through 20 detections of automatic hand-up circuit, analysis and judgement, driving, make switch J from the J1-2 position hopping to the J1-3 position, disconnect speaking circuit and connect ringing circuit, promptly P1 → K1-2 → J1-3 → S → C1 → P2 constitutes path, and telephone set transfers the state of hanging up to by the continuous state of on-hook.But user's off-hook is reminded in the outside line ring.

Referring to 11 being the ringing telephone stations circuit among Fig. 2, the figure, 12 is the telephone power circuit, and 13 is the telephone set pulse signaling circuit, and 14 is telephone set pulse dialing and storage circuit, and 15 is the telephone set damping circuit, and 16 is keyboard circuit, and 17 is speaking circuit.The continuous automatic hand-up circuit 20 of the prevented on-hook that is increased comprises signal deteching circuit 21, continuous busy-back signal judging circuit of on-hook that constitutes by counting circuit 22, time-base circuit 23 with gate 24 and the switching circuit 25 of carrying out automatic hand-up.J is the execution unit of switching circuit.

Busy-back signal is a kind of 400-450HZ, the regular signal of logical 0.35S, disconnected 0.35S, and promptly the cycle is 0.7 discontinuous signal, with other signals on the speaking circuit obvious difference is arranged, and is cycle of logical 1 second, disconnected 4 seconds to be 5 seconds discontinuous signal as ringing tone signal.Dial impulse is subjected to the partition of damping circuit 15, can only be in the outside line transmission can not be gone here and there speaking circuit.Therefore, it is practicable detecting busy-back signal from the conversation phone.

Signal deteching circuit 21 picked up signal on the telephone set speaking circuit 17 is handled through shaping and is formed pulse signal, and 22 pairs of these pulse signals of counting circuit are counted.Time-base circuit 23 period T is at regular intervals sent a positive pulse signal to counting circuit 22 zero clearings, and counting circuit is counted again since 0.If at a period of time T inside counting circuit 22 to predetermined value N, then just judge to be busy-back signal on the talking path by the judging circuit that constitutes with gate 24, send positive pulse signal to the switching circuit 25 of carrying out on-hook simultaneously, make switch motion be in the J1-3 position.

Embodiment selects T=6 second, counting predetermined value N=8, and promptly being 8 in the inside counting pulse of 6 second time, can to differentiate be the disconnected busy-back signal (0.7 * 8 second) of on-hook.When gate time is expired hour counter zero clearing in 6 seconds from New count.

Referring to Fig. 3, signal deteching circuit is made up of R6, Q2, R7, R8, D3, D4, C5, from the transformer T1 taking-up signal of speaking circuit 17, remove negative half period through C5 stopping direct current, D4 amplitude limit, D3, charge to C4 through R8 again, the C4 current potential is risen, the Q2 conducting, the Q2 collector voltage drops to electronegative potential; When no signal was sent here on the speaking circuit 17, C4 discharged by R7, and Q2 rises to high potential by the Q2 collector electrode.When in the speaking circuit busy-back signal being arranged, then C4 charging in 0.35 second logical time, C4 discharge in 0.35 second break time.The rest may be inferred, and the various signals on the speaking circuit 17 are processed into interrupted pulse signal by shaping behind signal deteching circuit, and then the cycle of being processed into is 0.7 second pulse to busy-back signal.

The time substrate U2 (NE555) and peripheral cell thereof constitute time-base circuit 23, produced a positive pulse every 6 seconds and export by 3 pin.About 0.25 second of positive pulse width, its charging interval is determined by R11, C6 by R10, C6 decision discharge time.

Counter U1 (74LS93), inverter N2, connect and compose counting circuit with door A2 and d type flip flop U0, with door A1 be the continuous busy-back signal judging circuit of on-hook.U1 counts the pulse on its 14 pin, when counting enough 7 pulses, the state of U1 output Q3-Q0 is 0111, with the state of four inputs of door A2 be 1111, d type flip flop Q0 triggers upset when the 8th count pulse arrives, D end (A2 output) one state is put its Q output, and be added to and the door A1 an input on, 3 pin of time-base circuit U2 also are added to and another input of door A1 and clear terminal MR1, the MR2 of counter U1 every positive pulse of generation in 6 seconds simultaneously, and counter U2 is cleared, A1 exports " 1 ".Therefore, only when 6 seconds inside counting circuit meters to 8 the time, the positive pulse that time-base circuit produces could be delivered to the base stage of Q1 with door A1, what guarantee to be judged is the disconnected busy-back signal of on-hook.

The switching circuit 25 of carrying out automatic hand-up is made of diode bridge B1, transistor Q1, relay J, buzzer Y and peripheral cell thereof.When A1 output high level, N1 exports " O ", Y conducting and the prompting that pipes, Q1 conducting simultaneously, to ground, the relay adhesive makes switch jump to J1-3 from J1-2 to electric current through rectifier bridge B1, current-limiting resistance R1, relay coil J, Q1, R2, the dividing potential drop of resistance R 3, R4 is kept the attracting state that the Q1 conducting is a relay J, disconnect phone circuit, synchronous signal detection and busy-back signal judging circuit only insert ringing circuit in the telephone line also because of outage quits work.When outside line is called when sending ringing-current here, constitute path and jingle bell through P1 → K1-2 → J1-3 → S → C1 → P2, user's off-hook, but since this moment hook switch K still in the K1-2 position, therefore still can jingle bell, the user can recognize that this is to cause because of the on-hook of last time conversing is continuous, pushes hook switch K and makes it get back to the K1-3 position, this moment, executive circuit cut-off relay J discharged and recovery J1-2 state, unclamped hook switch K and then entered the normal talking state.

And when normal on-hook, switch hook K is in the K1-3 position, and speaking circuit, signal deteching circuit, the continuous busy-back signal judging circuit of on-hook and to carry out the switching circuit of on-hook all inoperative because of outage do not influence conversation.

The utility model has increased the automatic hand-up phone at the continuous problem of on-hook on original call machine architecture basics, solved the problem that telephone set can not be connected because of the continuous outside line that brings of on-hook.

Claims (5)

1, a kind of continuous telephone set of on-hook that prevents comprises telephone set network, and described telephone set network includes hook switch, ringing circuit, power circuit and speaking circuit at least, it is characterized in that:

Comprise that also one can prevent the continuous automatic hand-up circuit of on-hook, being linked in sequence by signal deteching circuit, the continuous busy-back signal judging circuit of on-hook and the switching circuit of carrying out automatic hand-up constitutes; The speaking circuit of the described telephone set network of signal deteching circuit input termination, hook switch one end of the described telephone set network of the public termination of switch of the switching circuit of execution automatic hand-up, the ringing circuit and the hook switch other end of switch one end of described switching circuit and described telephone set network, the power circuit of the described telephone set network of another termination of the switch of described switching circuit.

2, the continuous telephone set of on-hook that prevents according to claim 1 is characterized in that; The continuous busy-back signal judging circuit of described on-hook comprise counting circuit, time-base circuit and and logic gates, the described signal deteching circuit output of counting circuit counting termination, time-base circuit output and connect the counting circuit clear terminal and with logic gates one input, another input of counting circuit output termination and logic gates.

3, the continuous telephone set of on-hook that prevents according to claim 1 is characterized in that; The switching circuit of described execution automatic hand-up is connected and composed by diode rectification bridge circuit and the transistor relay drive circuit that has from keeping function, diode rectification bridge circuit input is attempted by between described switch common port, hook switch one end and a telephone wire, diode rectification bridge circuit output is succeeded electric apparatus coil one end, described switch common port is the intermediate contact of relay, described switch one end is the moving contact of relay, and the described switch other end is the fixed contact of relay.

4, the continuous telephone set of on-hook that prevents according to claim 1 is characterized in that; The described continuous automatic hand-up circuit of on-hook that prevents also comprises a buzzer circuit, is connected with described busy-back signal judging circuit output.

5, the continuous telephone set of on-hook that prevents according to claim 1 is characterized in that; Described signal deteching circuit is the pulse shaper that is linked in sequence and is constituted by coupling capacitance, voltage stabilizing didoe amplitude limit, diode halfwave rectifier, charge and discharge capacitance and transistor circuit.

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