CN2167488Y - Extension type telephone with intercalling and locking - Google Patents

Abstract

The utility model relates to a party-line extension telephone capable of intercalling and interlocking, which is composed of an external line monitoring circuit 1, an extension telephone lifting and calling monitoring circuit 2, a music and delay circuit 3, an extension telephone calling circuit 4 and a telephone circuit 5, wherein, the external line monitoring circuit 1 is connected with subscriber lines (L1, L2), output terminals of the extension telephone calling circuit 4 and the music and delay circuit 3, and a push-button switch, and an output terminal of the external line monitoring circuit 1 is connected with an input terminal of the extension telephone lifting and calling monitoring circuit 2 of which the output terminal is connected with the input terminal of the music and delay circuit 3. Besides the functions of intercalling and interlocking of the extension telephone, the utility model can make an extension telephone of a second party always play music through pressing a button when intercalling is carried out, and can automatically indicate busy tone toward external lines when the extension telephone of the second party is not picked up in 30 seconds. All the circuits are installed in the telephone set, and the party-line extension telephone which has no additional connecting lines outside has the advantages of small insertion loss of the entire telephone, no noise and high reliability.

Description

Extension type telephone with intercalling and locking

The extension telephone set of collinear energy mutually-calling and interlocking belongs to communication terminal equipment.

The change-over circuit great majority of existing party-line controller all are to adopt relay or thyristor, have that power consumption is big, insertion loss greatly, easily produces noise, and the contact frequent movement is prone to obstacle.When another extension set of a call extension, must push button all the time till the other side's extension set is replied by the people, if nobody replys and must notify the outside line user, promptly lose time and waste of manpower.Loop circuit impedance obviously descends when extension set surpasses three, will influence communication quality.

The purpose of this utility model is that a kind of change-over circuit of design is without relay and thyristor, when side's call extension the opposing party extension set, as long as click button the other side extension set with regard to the sound that rings always,, send busy tone to the outside line caller by the time just cut off automatically behind the certain hour.The extension telephone set of the collinear energy mutually-calling and interlocking that loop circuit impedance does not also descend when extension set surpasses three.

The utility model is carried machine call supervision circuit 2, music and delay circuit 3, is called out and divide machine circuit 4, phone circuit 5 to form by outside line monitoring circuit 1, extension set.Outside line monitoring circuit 1 meets subscribers feeder L1, L2, and links to each other with the output of calling out the output, music and the delay circuit 3 that divide machine circuit 4, the key switch of phone circuit 5 respectively.The output of outside line monitoring circuit 1 connects the input that extension set is carried machine call supervision circuit 2, and extension set is carried the output termination music of machine call supervision circuit 2 and the input of delay circuit 3.

Outside line monitoring circuit 1 includes the switching circuit of being made up of triode T1, voltage stabilizing didoe D1, resistance R 1, R2, charging and discharging circuit two parts of being made up of R2, R4, C1.Extension set is carried machine call supervision circuit 2 and is included the power switch circuit of being made up of T2, T6, R5～R7, the start-up circuit of being made up of T3, R9, R10, vibration decoding circuit three parts of being made up of IC2, R11, W1, C3, C6～C8.Music and delay circuit 3 include the trigger control circuit of being made up of T7, T4, R12～R14, R21, C5, D3, IC1, the delay circuit of forming by R15, R16, C4, music amplifying circuit three parts of forming by R17～R19, C9～C11, T5, loudspeaker Y, musical film IC4.Call out and divide machine circuit 4 to be made up of IC3, R20, R22, C12～C14, D4, W2, phone circuit 5 also comprises button K2, and is connected on the K2-2 of button K2.All be provided with identical this circuit one cover in each party line telephone subset.Outside line monitoring circuit 1 is mainly used in and monitors whether off-hook of extension set, then starts extension set if any off-hook and carries machine call supervision circuit 2.Extension set carry machine call supervision circuit 2 when not starting, do not insert outside line loop, start the signaling that another call extension is prepared to receive in the back, then start the music and the delay circuit of the other side's extension set after the receipt of call signaling.Do not insert line circuit before music and delay circuit do not start yet, start the back and constitute the loop, and occupy the user loop of telephone office, music is reached the other side's extension set and outside line caller, the other side is waited for outside line.Delay circuit only allows music to send out certain hour, during the unmanned off-hook of overstepping the time limit the other side extension set, then stops to send music to outside line, at this moment telephone office promptly send busy tone to the outside line caller, and main frame is also with regard to on-hook.The path that when the other side's extension set off-hook, then cuts off music and delay circuit and outside line.Call out and divide the effect of machine circuit to be, start the other side's music and delay circuit, produce voice-frequency signaling and deliver to the other side's extension set when the people presses on ﹠ off switch.Phone circuit provides to send is talked about power supply, and finishes the auto-lock function after another extension set is carried machine.

The utlity model has between extension set cry mutually, interlock function, just resonant is happy always as long as click key the opposing party extension set when crying mutually, treats 30 seconds unmanned off-hooks, then cuts off signaling automatically, and send busy tone to outside line, saves manpower, time.All circuit all is installed in the telephone set, outside no any additional lead.So the complete machine insertion loss is little, noiselessness, reliability height, loop circuit impedance do not reduce, and the collinear a plurality of extension sets of meaning of taking over and do not influence communication quality after adding battery.

Fig. 1 is the block diagram of the utility model circuit.

Fig. 2 is an electrical block diagram of the present utility model.

Embodiment: present embodiment is carried machine call supervision circuit 2, music and delay circuit 3, is called out and divide machine circuit 4, phone circuit 5 to form by outside line monitoring circuit 1, extension set.Outside line monitoring circuit 1 one side joint subscribers feeder L1, L2, and link to each other with normally opened contact K2-3 with the back contact K2-2 of the button K2 of the output of the output, music and the delay circuit 3 that call out to divide machine circuit 4, phone circuit 5 respectively.The output of outside line monitoring circuit 1 is connected to the input that extension set is carried machine call supervision circuit 2, and the output that extension set is carried machine call supervision circuit 2 connects the input of music and delay circuit 3.Outside line monitoring circuit 1 includes switching circuit of being made up of R1, D1, T1, R2 and charging and discharging circuit two parts of being made up of R2, R4, C1.Between K1-2 point that the machine that is serially connected in is pitched behind D1, the R1 polyphone and the base stage of triode T1, R2 and R4 contact mutually connect the collector electrode of T1, the K1-2 point that the other end of R2 is also met sb. at the airport and pitched, the end of another termination C1 of R4, this termination extension set of C1 is carried the input of machine call supervision circuit 2.When extension set quantity surpasses three, can pitch K1-2 and extension set at machine and carry and add a battery charge loop between the machine call supervision circuit 2, this loop is made up of R3, D5, D2, E.

Extension set is carried machine call supervision circuit 2 and is included the power switch circuit of being made up of T2, T6, R5～R7, the start-up circuit of forming by T3, R9, R10, the vibration decoding circuit of being made up of IC2, R11, W1, C3, C6～C8 is by R8, D6, indicating circuit four parts formed.T6 emitter, collector series connection are between 4 pin of machine fork and IC2, and the T6 base stage connects the collector electrode of T2 through R6, and the emitter of T2 is through R7 ground connection.The base stage of T2 meets C1 and connects the base stage of T3 through R9.The emitter of T3, collector series connection are at 8 pin of IC2 and the input of music and delay circuit 3.

Music and delay circuit 3 include the trigger control circuit of being made up of T7, T4, R12～R14, R21, C5, D3, IC1, the delay circuit of forming by R15, R16, C4, music amplifying circuit three parts of forming by R17～R19, C9～C11, T5, Y, IC4.The emitter of T7, collector series connection are carried between 4 pin, 8 pin of output, machine fork K1-2 point and the IC1 of machine call supervision circuit 2 at extension set, the base stage of T7 connects the collector electrode of T4 through R13, the base stage of T4 connects 3 pin of IC1, and connects the collector electrode of T7 through R14, and the emitter of T4 is through D3 ground connection.R15 is serially connected between the collector electrode of 7 pin of IC1 and T7, and R16 is serially connected between 7 pin and 2,6 pin of IC1, and C4 goes here and there between 6 pin and ground of IC1.R17, R18, C9～C11 form filter circuit, the filter circuit string between the base stage of musical film IC4 and T5, the emitter of another termination of IC4 T4, loudspeaker Y is attempted by between the collector and emitter of T5.

Call out and divide machine circuit 4 to form by IC3, R20, R22, C12～C14, D4, W2.IC3 is served as by NE555, and IC3 is connected with above element and cooperates the composition oscillator, K1-3 and button K2-1 that 3 pin of IC3 are met sb. at the airport and pitched through C12, and 4 pin of IC3 meet button K2-3 through R20.Phone circuit 5 is connected on the button K2-2.Phone circuit only need be changed a resistance, increases a diode to finish self-blockade function behind the extension set off-hook.

The voltage that outside line is sent here when extension set is not carried machine is+48V, makes D1 puncture conducting, and T1 is also full to close conducting, and the last voltage of C1 is 0V, does not at this moment start extension set and carries machine call supervision circuit 2.Outside line voltage becomes+10V behind the extension set off-hook, and D1 can not puncture conducting, so T1 also just can not conducting, like this+10V charges to C1 through R2, R4.T2 conducting when VC1 is charged to the T2 cut-in voltage.Also and then conducting of T6 after the T2 conducting ,+10V voltage is supplied with IC2, and IC2 starts working and waits for the voice-frequency signaling that reception the other side extension set comes.When 3 pin of IC2 have the audio signal input, and when the resonance frequency of the frequency of audio frequency and R11, W1, C8 is identical, tone decoder IC2(is served as by LM567) 8 pin just export a low level, make the T3 conducting, the frequency of the audio frequency of input of absence of audio signal or input is different with resonance frequency, then 8 pin of IC2 output one high anti-resistance, T3 ends.When the other side's extension set has audio signal input (this circuit that a cover identical parameters is all arranged in collinear each extension set), then 8 pin of IC2 make the T3 conducting with regard to output low level.Make also conducting of T7, T4 after the T3 conducting, make IC1 work, delay circuit work.Make IC4 work after the T4 conducting, filter circuit, amplifier T5, loudspeaker Y are all worked, and send musical sound.When the musical sound of calling out reached 30 seconds, delay circuit made 3 pin of IC1 export a low level to make T4 that (decontroling because of button only clicks promptly, so the starting current that is provided by T3 disappears) is provided.At this moment music circuit and outside line disconnects, and send busy tone by telephone office to outside line.When this extension set was not called out, the quiet phone that is combined into of the K2-1 of button K2 and K2-2 provided path, and K2-1 and K2-3 are moving when this extension set is called out closes, and send a voice-frequency signaling to IC3.IC3 vibration, 3 pin start the music and the delay circuit of the other side's extension set through C12.K1-1 and K1-3 connect after phone is carried machine, and for phone circuit provides power supply, K1-1 and K1-2 disconnect simultaneously, and monitoring circuit and outside line are disconnected.

Claims (5)

1, the extension telephone set of collinear energy mutually-calling and interlocking is carried machine call supervision circuit 2, music and delay circuit 3, is called out and divide machine circuit 4, phone circuit 5 to form by outside line monitoring circuit 1, extension set, it is characterized in that outside line monitoring circuit 1 meets subscribers feeder L ₁, L ₂And link to each other with the output of calling out the output, music and the delay circuit 3 that divide machine circuit 4, the key switch of phone circuit 5 respectively, the output of outside line monitoring circuit 1 connects the input that extension set is carried machine call supervision circuit 2, extension set is carried the output termination music of machine call supervision circuit 2 and the input of delay circuit 3, all is provided with identical this circuit one cover in each party line telephone subset.

2, the extension telephone set of collinear energy mutually-calling and interlocking according to claim 1, it is characterized in that outside line monitoring circuit 1 includes the switching circuit of being made up of triode T1, voltage stabilizing didoe D1, resistance R 1, R2, charging and discharging circuit two parts of forming by R2, R4, C1, between K1-2 point that the machine that is serially connected in is pitched after D1, the R1 series connection and the base stage of triode T1, R2 and R4 contact mutually connect the collector electrode of T1, the K1-2 point that the other end of R2 is also met sb. at the airport and pitched, the end of another termination C1 of R4, this termination extension set of C1 is carried the input of machine call supervision circuit 2.

3, the extension telephone set of collinear energy mutually-calling and interlocking according to claim 1, it is characterized in that extension set carries machine call supervision circuit 2 and include by T2, T6, the power switch circuit that R5～R7 forms, by T3, R9, the start-up circuit that R10 forms, by IC2, R11, W1, C3, three parts are deciphered in the vibration that C6～C8 forms, the T6 emitter, collector series connection is between 4 pin of machine fork and IC2, the base stage of T6 connects the collector electrode of T2 through R6, the emitter of T2 is through R7 ground connection, the base stage of T2 meets C1 and connects the base stage of T3, the emitter of T3 through R9, collector series connection is at 8 pin of IC2 and the input of music and delay circuit 3.

4, the extension telephone set of collinear energy mutually-calling and interlocking according to claim 1, it is characterized in that music and delay circuit 3 include by T7, T4, R12～R14, R21, C5, D3, the trigger control circuit that IC1 forms, by R15, R16, the delay circuit that C4 forms, by R17～R19, C9～C11, T5, loudspeaker Y, music amplifying circuit three parts that music integrated chip IC4 forms, the emission collection of T7, collector series connection is carried the output of machine call supervision circuit 2 at extension set, 4 pin of machine fork K1-2 point and IC1, between 8 pin, the base stage of T7 connects the collector electrode of T4 through R13, the base stage of T4 connects 3 pin of IC3, and connecing the collector electrode of T7 through R14, the emitter of T4 is through D3 ground connection; R15 is serially connected between the collector electrode of 7 pin of IC1 and T7, R16 is serially connected between 7 pin of IC1 and 2 pin, 6 pin, the C4 string is between 6 pin and ground of IC1, R17, R18, C9～C11 form filter circuit, the filter circuit string is between the base stage of musical film IC4 and T5, the emitter of another termination T4 of IC4, loudspeaker Y is attempted by between the collector and emitter of T5.

5, the extension telephone set of collinear energy mutually-calling and interlocking according to claim 1, it is characterized in that calling out and divide machine circuit 4 to form by IC3, R20, R22, C12～C14, D4, W2, IC3 and above element connect to form oscillator, 3 pin of IC1 through C12 meet sb. at the airport the fork the K1-3 point and the K2-1 point of button, 4 pin of IC3 connect the K2-3 point of button through R20.

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