CN2158155Y - Program control power carrier telephone set - Google Patents

Abstract

The utility model relates to a duplex telephone for the power line carrier multichannel dialling selective call and the automatic switching. The utility model mainly solves the insufficiencies that the existing power line carrier telephone has few channels, and the existing power line carrier telephone can not be communicated with public telephone networks. A large number of users are difficult to realize the network interconnection. The whole device comprises a single chip computer (1), a frequency synthesis and modulator (5), a high frequency power amplifier (9), a frequency mixing demodulation (7), a voice frequency power amplifier (8), a dual voice multiple frequency encoder (2), a scanning frequency selection circuit (4) and a speech line interface circuit, wherein, the high frequency power amplifier (9) and the frequency mixing demodulation circuit (7) are connected with power lines through a coupling circuit (10). One end of the speech line interface circuit is connected with the single chip computer (1). The other end of the speech line interface circuit is connected with public telephone lines. The utility model has the advantages of low code error rate, short call time, strong spectrum function, convenient operation, etc. The utility model is connected with public telephone networks.

Description

Program control power carrier telephone set

The utility model relates to a kind of communication equipment, particularly power line carrier multichannel dialing selective call and exchange duplex telephony automatically.

Along with the development of telecommunications, utilize all kinds of transmission systems of phone networking more and more many.Select which kind of channel medium can make networking simple, expense is low, and it is little that electricity is grown pollution, can be present communications field question of common concern with the public telephone intercommunication again.The power carrier communicating tech that China is adopted in 91218979 patents, though be to make networking simple, it is few to exist channel, can not with the public telephone net interconnecting, to realize that the large user measures the defective of networking, its scope of application is restricted.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art, provide a kind of on power network carrier wave multi-frequency scanning and DTMF pulsing selective call.Can realize that the large user networks and with the power line carrier telephone system machine of public telephone network interface.

Realize that the utility model purpose technical scheme is to finish scanning and dialing selective call user networking respectively by single-chip microcomputer and peripheral hardware circuit.Public telephone network interface etc.Promptly by all idle carrier telephones of Single-chip Controlling with eight all channels of some cycles scan round, each channel have the height two frequencies, be positioned at after the scanning on the same idle channels, with its dial-up and the conversation all be based upon on this idle channels.When a certain subscriber dialing, single-chip microcomputer is with the transmission of encoding of corresponding touch-tone signal, and other substations receive this touch-tone signal after single-chip microcomputer decoding differentiates whether call out oneself, if calling oneself, then the user is informed in ring.All the other phones turn to next idle channels of scanning and are positioned on this channel.When the electric power user on the network dials when making special code word request enter public telephone network, whether idle, if the free time is then opened the words line interface, set up conversation if differentiating circuit by single-chip microcomputer.If line be busy is then sent busy tone.When the public telephone user dials in the electric carrier telephony net, have the carrier telephone simulation off-hook of public telephone interface function, the public telephone user hears the user that two-stage dialing is called out power network behind the ring-back tone, can set up conversation.

The utility model is owing to adopt multi-frequency scanning location technology, thereby can reach the requirement of measuring networking with small number of frequencies and large user; Simultaneously owing to call out the DTMF pulsing mode that adopts.So than existing pulse dialing method good reliability, the error rate is low, call time short, narrow spectrum, and help various signalings and variously pluck, the foundation of on-hook sign, busy not busy sign and particular service; In addition since this phone can with the public telephone interface, thereby function is strong, and is easy to use.

Followingly describe structural principle of the present utility model in detail with reference to accompanying drawing.

Fig. 1 is a circuit structure block diagram of the present utility model

Fig. 2 is high frequency of the present utility model, audio frequency, frequency modulation, frequency synthesis and demodulation part line assumption diagram.

Fig. 3 is scanning of the present utility model, modulation, coding and decoding and single chip part line assumption diagram.

Fig. 4 is that ring of the present utility model detects voice network part line assumption diagram.

With reference to Fig. 1, the utility model is by single-chip microcomputer 1, dual-tone multifrequency (DTMF ₁) encoder 2, keyboard 3, scanning frequency selection circuit 4, frequency synthesis and modulator 5, mixting circuit 6, demodulator circuit 7, audio power amplifying circuit 8, high frequency power amplifier 9, coupling circuit 10, voice network 11, simulation circuit for answering 12, ring detecting circuit 13 and microphone amplifying circuit 14 are formed.Wherein single-chip microcomputer 1 respectively with scanning frequency selection circuit 4, frequency synthesis and modulator 5.Double-tone multi-frequency coding device 2, demodulator circuit 7.Simulation circuit for answering 12, ring detecting circuit 13 connects microphone amplifying circuit 14.Voice network 11, the output of dual-tone multifrequency coder 2 close the input that is not connected to frequency synthesis and modulator 5 and carry out frequency synthesis, and the signal after synthesizing is input to radio frequency power amplifier 9.High frequency power amplifier 9 is connected with power line by coupling circuit 10 with mixting circuit 6.The signal of scanning frequency selection circuit output enters mixting circuit 6 and enter demodulator circuit 7 after power line enters coupler and high-frequency signal mixing, divide three tunnel outputs after the demodulation, one the road is connected to audio frequency amplifier 8, one the tunnel connects single-chip microcomputer, and one the tunnel is connected respectively to dual-tone multifrequency coder 2 and voice network 11.Voice network 11 is connected with simulation circuit for answering 12, and ring detecting circuit 13 is connected with pay station line.

With reference to Fig. 2, I _C1Adopt the F3020A integrated package, I _C1With its peripheral element R ₁, R ₂, R ₃, R ₄, C ₁, C ₂, C ₃, C ₄, C ₅, triode V ₁Constitute high frequency power amplifier.I _C2Adopt the TA7640 integrated package, I _C2With its peripheral element R ₁₂, C ₁₀, C ₁₁, C ₁₂, C ₁₃, C ₁₄, C ₁₅, C ₁₆, C ₁₇, coil B ₃, B ₄, L ₅, variable capacitance diode D ₄Constitute mixing and demodulator circuit.I _C3Adopt the LM386 integrated package, I _C3With its peripheral element R ₁₅, R ₁₆, C ₁₈, C ₁₉, C ₂₀, C ₂₁, C ₂₂, C ₂₃, C ₂₄, diode D ₃Constituting audio power amplifies.Triode V ₄With its peripheral element R ₁₇, R ₁₈, R ₁₉, R ₂₀, R ₂₁, C ₂₅, C ₂₆, C ₂₇, C ₃₂Form the MIC amplifier.I _C4Adopt the CD4046 integrated package, I _C4A, B, C, D end be connected with A, B, C, the D end of Fig. 3 respectively.I _C6Adopt the CD14526 integrated package, I _C4, I _C6And peripheral element R ₅, R ₆, R ₇, R ₈, R ₉, R ₁₀, R ₁₁, R ₂₂, C ₆, C ₇, C ₈, diode D ₁, D ₂, triode V ₁, V ₂, V ₃, constitute frequency synthesis and modulation circuit.I _C2Tuning indication end D is connected to single-chip microcomputer I _C7Interface end as scanning flag.

Transformer B ₁, B ₂, coil L ₁, L ₂, L ₃, L ₄, capacitor C ₂₈, C ₂₉, C ₃₀, C ₃₁Form coupling circuit, constitute the I of radio frequency power amplifier _C1Transformer B with coupling circuit ₁Be connected, constitute the I of mixing and demodulator circuit _C2Transformer B with coupling circuit ₂Be connected R ₁₇, R ₁₈, R ₁₉, R ₂₀, R ₂₁, C ₂₅, C ₂₆, C ₂₇, C ₃₂, V ₄, receiver MIC forms microphone amplifier.

Among Fig. 3, I _C5Adopt the CC4097 integrated package, I _C5With its peripheral element R ₄₅～R ₆₀With the R among Fig. 2 ₁₃, R ₁₄, C ₁₇, variable capacitance diode D ₄Constitute the scanning frequency selection circuit, I _C5The I end of 1 leg and Fig. 2 be connected.I _C8Adopt the MT8880 integrated package, I _C8With its peripheral element C ₅₄, C ₅₅, C ₅₆, R ₆₄, R ₆₅, R ₆₆, R ₆₇, crystal oscillator TAL2 constitutes the dual-tone multifrequency coding and decoding circuit.I _C7Adopt 8751 single-chip microcomputers, I _C7With crystal oscillator X7AL1, C ₅₂, C ₅₃Form Single Chip Microcomputer (SCM) system.C ₅₁, R ₆₂Form I _C7Resetting system, AN is the frequency fogging knob when calling out.I _C7J, K, L, M end link to each other I with J, K, L, the M end of Fig. 4 respectively _C7A, E, F, D end link to each other with A, E, F, the D end of Fig. 2 respectively.I _C8H, G the end respectively with Fig. 4 in H, G the end be connected.

Among Fig. 4, I _C9Adopt the CD4093 integrated package, adopt I in the circuit _C9a, I _C9bThree same model (CD4093) and photoelectrical coupler DB ₁, diode D ₅, R ₂₂, R ₂₃, R ₂₄, C ₃₃, C ₃₄Constitute ring detecting circuit.Ring detecting circuit is connected with telephone wire, triode V ₅, relay J ₁, diode D ₆, I _C9cAnd LED is formed the simulation circuit for answering.I _C10Adopt the TEA1062 integrated package, I _C10With its peripheral element R ₂₆～R ₄₃, C ₃₅～C ₅And rectifier bridge heap D ₈～D ₁₁And voltage stabilizing circuit R ₄₄, D ₇Constitute voice network.Whole ring detecting circuit, simulation circuit for answering and voice network are formed the words line interface.

The course of work of the present utility model is as follows:

1. duplex conversation.When telephone set is in hook state, by single-chip microcomputer I _C7Gated sweep frequency selection circuit I _C5Frequency low side to eight channels scans detection every some cycles, determines idle channels and no dial tone is arranged, if there is not the scanning of continuation, then is positioned on this idle channels if having.When the off-hook master exhales, current receive frequency is changed to tranmitting frequency by " * " key, i.e. the height frequency fogging of each channel, and on keyboard, dial four item sign indicating numbers, first is outer line index, at this moment, single-chip microcomputer I _C7Key number is changed into dtmf code by frequency synthesis and modulator I _C4, I _C6, through radio frequency power amplifier I _C1Be coupled on the power line, all phones on same channel receive the DTMF code word after single-chip microcomputer differentiates whether call out oneself, then open the audio frequency power amplifier switch if call out oneself, ring also performs the conversation preparation, just can carry out the duplex conversation behind called subscriber's off-hook.

2. converse with public telephone network.When power network is substation calling public circuit user,, therefore must set up conversation by talking about line interface phone and public telephone network because whole electric carrier telephony net has only the minority carrier telephone to possess the function of communicating by letter with public telephone network.At this moment, by main exhale phone to transfer to outside line key after, by single-chip microcomputer 1 control simulation circuit for answering work, itself and pay station line are connected, and are passed through speech, network is set up the intercommunication between main dialing telephone and the public telephone substation.Main dialing telephone hears that secondary behind the ring-back tone dials the telephone number of public telephone, can communicate with each other.

3. public telephone network and electric carrier telephony intercommunication exchange detects bell signal by ring detecting circuit and inputs to single-chip microcomputer I when on the public telephone customer call power network during carrier wave telephone subscriber _C7, simulating off-hook by Single-chip Controlling simulation circuit for answering, secondary was dialled power network user's number after caller public telephone user heard ring-back tone, by frequency synthesis and modulation, through power amplifier I _C1Send on the power line, public telephone network and electric carrier telephony intercommunication exchange can be set up in called electric carrier telephony off-hook reply.

Claims (3)

1, a kind of carrier telephone, include single-chip microcomputer (1), frequency synthesis and modulator (5), radio frequency power amplifier (9), coupling circuit (10), mixing demodulation (7), audio frequency power amplifier (8) and keyboard (3), radio frequency power amplifier (9) is connected with power line by coupling circuit (10) with mixing demodulator circuit (7), the interface end that it is characterized in that single-chip microcomputer (1) is connected with double-tone multi-frequency coding device (2) respectively, scanning frequency selection circuit (4) and words line interface circuit, the other end of words line interface circuit is connected with pay station line; Single-chip Controlling scanning frequency selection circuit search idle channels is set up dialing, calling and conversation, and sends coding and decoding differentiation and open the words line interface and the public telephone networking with corresponding touch-tone signal.

2, telephone set according to claim 1, it is characterized in that talking about the line interface circuit is to be detected by ring, simulation off-hook and voice network constitute.

3, telephone set according to claim 1 is characterized in that the I as the mixing demodulator _C2Tuning indication end D is connected to single-chip microcomputer I _C7Interface end as scanning flag.

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