CN2219564Y

CN2219564Y - Sound-controlled automatic onhook intercommunication telephone switch

Info

Publication number: CN2219564Y
Application number: CN 94224304
Authority: CN
Inventors: 李松秀
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-18
Filing date: 1994-07-18
Publication date: 1996-02-07
Anticipated expiration: 2004-07-18

Abstract

The utility model relates to a sound control hand-free talkback automatic on-hook telephone switch which comprises a frequency decoder 1, an operational amplifier 2, a relay 6, a bell signal selecting circuit 4, a feed circuit 5 for the operational amplifier, a frequency decoder 7 and a relay 8. After the switch provided by the utility model is connected with an ordinary telephone, a hand-free button does not need to be pressed when a telephone receives a call, and a user can talk with a caller only by saying 'hello'; after the talk is finished, the automatic on-hook action can be carried out. The utility model is not only used for the presently used ordinary telephones but also used for other wire communication.

Description

The hands-free intercommunication automatic hand-up of acoustic control telephone switch

The utility model belongs to the acoustic control electronic switch, the hands-free intercommunication automatic hand-up of the acoustic control telephone switch of the hands-free automatic hand-up of particularly a kind of energy acoustic control.

Telephone set has entered huge numbers of families at present, bring great convenience to people, its function obtains constantly perfect, particularly hands-free phone can directly engage in the dialogue without off-hook, but when adopting hand-free call, must manually give and put the hands-free switch of telephone set and be in the hand-free call state, behind the end of conversation, also need connect hands-free switch and recover hook state, start inconvenient problem by hands-free switch when existing people to answer the call earlier.

Need not start when the purpose of this utility model provides a kind of answering the call by hands-free switch, only need give a call " feeding " just can receive phone and intercommunication, and intercommunication finishes, and recovers the telephone switch of the hands-free intercommunication automatic hand-up of acoustic control of hook state automatically.

Following mode of the present utility model realizes: the hands-free intercommunication automatic hand-up of acoustic control telephone switch, after it receives the sound control signal of bell signal that telephone wire transmits and sonic transducer input, realize the telephone set off-hook by relay, when receiving, finish on-hook work by relay from 450Hz signal that telephone wire transmits.The bell signal of the hands-free intercommunication automatic hand-up of acoustic control telephone switch is selected circuit, after receiving the 25Hz bell signal, output low level, control operational amplifier power supply circuits, make operational amplifier enter operating state, prepare for amplifying through the sound control signal of frequency decoder input, at this moment the sound control signal that receives of sonic transducer, decode by frequency decoder, the output low level signal amplifies through operational amplifier, and paraphase output high level removes to control monostable flipflop, monostable flipflop control is plucked, the on-hook relay, realizes the telephone set handoff functionality.When intercommunication finishes, during the other side's on-hook, the 450Hz signal that transmits in the telephone wire, after the frequency decoder decoding, output low level is removed control relay, relay triggers the monostable flipflop upset, make pluck, on-hook finishes on-hook work with relay.

The utility model comprises: frequency decoder (1), operational amplifier (2), relay (6), bell signal are selected circuit (4), operational amplifier power supply circuits (5), frequency decoder (7) and relay (8); Bell signal selects the input and the telephone wire of circuit (4) to join, the input of output termination operational amplifier power supply circuits (5), the power input of the output termination operational amplifier (2) of operational amplifier power supply circuits (5); Frequency decoder (1) is connected between the input of microphone M and operational amplifier (2), and the output of operational amplifier (2) connects the input of trigger (3), and the winding of relay (6) is serially connected on the output loop of trigger (3); The input that frequency is touched a yard device (7) line of answering the call, the input that the winding of its output relay termination (8), the contact of relay road (8) are connected on trigger (3) turn-offs with control trigger (3).

Characteristics of the present utility model be the hand of existing telephone machine by hands-free switch, replace with the acoustic control electronic switch, realize the acoustic control off-hook automatic hand-up of telephone set.And then the function of raising telephone set, bring more facility to people.

Fig. 1 is the block diagram of the utility model and the supporting composition of wire telephone.

Fig. 2 is circuit theory diagrams of the present utility model.

In block diagram 1, bell signal selects circuit (4) from telephone set outside line L1, L2 receives the 25Hz bell signal, output high level control operational amplifier power supply circuits (5) after selecting, make operational amplifier (2) enter operating state, for amplifying from the signal of frequency decoder (1) input, operational amplifier prepares, after the people's that frequency decoder (1) receives sonic transducer M sound control signal carries out the frequency decoding, the output low level pulse signal, amplify paraphase output high level pulse through operational amplifier (2) and remove to control trigger (3), trigger (3) control relay (6), realize the telephone set handoff functionality, make telephone set (9) enter operating state.When intercommunication finishes, frequency decoder during the other side's on-hook (7) receives the 450Hz simple signal that transmits from telephone wire L1, L2, and the output low level signal of decoding, remove control relay (8), relay (8) triggers trigger (3) upset, remove control relay (6), make telephone set (9) reply hook state.

In Fig. 2, deliver to bell signal selection circuit by the 25Hz bell signal that telephone set outside line L1, L2 call in, bell signal selects circuit 4 to be made up of diode D1, triode T1, capacitor C 1, resistance R 1 etc.Bell signal is imported by L1, L2, through capacitor C 1 to diode D1, amplify to triode T1 by resistance R 1, output is less than the low level of 1/3rd supply voltages, and deliver to operational amplifier power supply circuits 5, the operational amplifier power supply circuits are made up of time-base circuit IC1 (5G1555), resistance R 2, R3, peripheral resistance capacitance elements such as triode T2, T3.Select the low level signal of circuit output to deliver to (2) pin of operational amplifier power supply circuits IC2 by bell signal,, provide supply voltage to operational amplifier through resistance R 2, triode T2, T3 resistance R 3 from (3) pin output power supplying control signal of IC1.Operational amplification circuit 2, form by peripheral resistance, capacity cells such as time-base circuit IC2 (5G1555), diode D2.The sound control signal that sends after people hear bell signal by sonic transducer M input, amplifies through capacitor C 2 to triode T4, by capacitor C 3 to frequency decoding circuit 1.Frequency decoding circuit 1 is made up of peripheral resistance capacitance elements such as decoding circuit IC3 (NE567), resistance R 4.Sound control signal is by (3) pin input of IC3, by the low level signal of (8) pin output less than 1V, through (2) of resistance R 4 to IC2 pin, amplify through IC2, (3) pin output high level by IC2, go to control the attitude circuits for triggering 3 that are triggered through diode D2, circuits for triggering 3 are made up of photoelectrical coupler IC5 (4N25), resistance R 5, triode T5 constant resistance capacity cell.(the collector electrode of a termination T5 of the light-emitting diode path of photoelectrical coupler IC5, the base stage of one termination T5 of the triode collection of IC5---emitter-base bandgap grading path, in the time of high level conducting of T5 input, make the light-emitting diode work of IC5, cause the triode conducting, for T5 provides base current, so just make T5 keep conducting state, thereby finish the work of trigger).By the high level signal of operational amplification circuit D2 output base stage to flip-flop circuit triode T5, make flip-flop operation, trigger control relay road 6 (J1) connect the hands-free switch of telephone set, make phone enter off-hook intercommunication state.When intercommunication finishes, during the other side's on-hook, transmit the 450Hz signal from telephone wire L1, L2, be input to frequency decoding circuit 7.This frequency decoding circuit is made up of peripheral resistance, capacity cells such as decoding circuit IC4 (NE567), resistance R 6.The 450Hz signal that transmits from telephone wire L1, L2, be input to (3) pin of IC4 through capacitor C 4,8 work of (8) pin output low level relay, make the base earth of triode T5 at its contact KJ2 closure, thereby T5 finishes automatic hand-up work by making relay J 1 dead electricity disconnect hands-free switch.Realized the new function of the hands-free automatic hand-up telephone switch of acoustic control of telephone set like this.

Claims

1, the hands-free intercommunication automatic hand-up of a kind of acoustic control telephone switch is characterized in that comprising:

Frequency decoder (1), operational amplifier (2), relay (6), bell signal are selected circuit (4), operational amplifier power supply circuits (5), frequency decoder (7) and relay (8); Bell signal selects the input and the telephone wire of circuit (4) to join, the input of output termination operational amplifier power supply circuits (5), the power input of the output termination operational amplifier (2) of operational amplifier power supply circuits (5); Frequency decoder (1) is connected between the input of microphone M and operational amplifier (2), and the output of operational amplifier (2) connects the input of trigger (3), and the winding of relay (6) is serially connected on the output loop of trigger (3); The input that frequency is touched a yard device (7) line of answering the call, the input that the winding of its output relay termination (8), the contact of relay (8) are connected on trigger (3) turn-offs with control trigger (3).