CN1547331A

CN1547331A - Visual talkback arrangement for intelligent subzone

Info

Publication number: CN1547331A
Application number: CNA2003101144543A
Authority: CN
Inventors: 栾利杰; 朱启超; 李伯广; 赵捷
Original assignee: SHANDONG HUATAI INTELLIGENT TECHNOLOGY Co Ltd
Current assignee: SHANDONG HUATAI INTELLIGENT TECHNOLOGY Co Ltd
Priority date: 2003-12-11
Filing date: 2003-12-11
Publication date: 2004-11-17
Anticipated expiration: 2023-12-11
Also published as: CN1272915C

Abstract

The invention discloses a visible interphone in an intelligent community. Because the current device respectively transmits audio frequency signals, video frequency signals, electric signals and digital signals, the tie lines are excessive and connection order is easy to err, which brings much trouble to debugging and maintenance. This invention can solve these problems, which can complete all signals transmission by one coaxial transmission line and reduce wiring tasks in favor of installation and use. The visible interphone is made up of indoor device, doorway device and management equipment, which is characterized by only one coaxial transmission line in the mutual communication and electric power transmission among all devices, the signals transmission between the indoor device and the management device is retransmitted by the doorway device, the management device is connected with computers.

Description

Intellectual communityintellectualized village's video intercom device

Technical field

The present invention relates to a kind of video intercom device of intellectual communityintellectualized village.

Background technology

In present various intellectual communityintellectualized villages build, all adopted visual talkback unit, these the device in adopted more audio frequency, video, electric power and digital signal respectively transmission manner carry out communication, caused the connection line complexity of whole device, the easy entanglement of line preface has brought great difficulty for debugging and maintenance work, multiple wiring simultaneously, also increased cost, brought inconvenience to the user.

Summary of the invention

The present invention is exactly in order to address the above problem, a kind of employing narrow-band FM technology is provided, only can realize the transmission work of audio frequency, video, electric power and digital signal with a coaxial cable, omitted other tie, simplified the workload of construction debugging, avoided the problem of multiple-way system center line preface entanglement, had low cost, advantage such as easy to use.

For achieving the above object, the present invention has adopted following technical scheme: a kind of intellectual communityintellectualized village video intercom device, it mainly is made up of devices such as indoor set, doorway machine and supervisors, it is characterized in that: above-mentioned each device communication and/or electric power transfer used medium to each other only is a coaxial cable, signal transmission between indoor set and supervisor is transmitted by doorway machine, and supervisor then connects with computer.

In indoor set and doorway machine device, all comprise signal amplification circuit, modulation integrated circuit and the single chip circuit of handling coaxial cable institute transmission signals; In the supervisor device, contain amplifying circuit and the modulation integrated circuit of handling coaxial cable transmission data, and the interface circuit that connects with terminal computer.

Described signal amplification circuit is divided into A, B, three unit of C, each unit is the operational amplifier formation of LM324 by model, wherein A unit IC2A is a negative feedback amplifier circuit, and it connects with the audio signal output end of modulation integrated circuit, carries out the amplification of audio signal; B unit IC2B is a negative feedback amplifier circuit, and it connects with the digital signal output end of modulation integrated circuit, digital signal is amplified, and the fixing DC bias of 2V; C unit IC2C is a voltage comparator, to carry out the threshold judgement of 2.5V from the output signal of B unit.

Described modulation integrated circuit is the integrated package of encapsulation, the model of used for indoor machine is ES200I, the model that doorway machine is used is ES200O, the model that supervisor is used is ES200M, constituting of its chip internal: it has a radio frequency amplifier, connects respectively with simulation frequency-selecting filter and digital frequency-selecting filter, and two filter connects with separately limiting amplifier again, carry out signal and amplify, the limiting amplifier output connects with the input of separately phase-locked loop modulation demodulator circuit respectively; Simultaneously, it also has two radio frequencies to amplify and switching circuit, the output of these two circuit connects with outside, its input then output with the 3rd phase-locked loop modulator-demodulator connects, another input then connects with the output of the first or second phase-locked loop modulator-demodulator, and three phase-locked loop modulation-demodulation circuits and two radio frequencies amplify and the control end of switching circuit can connect with external circuit.

Described used for indoor machine single-chip microcomputer model is AT89C2051, and doorway machine is 89C51 with the single-chip microcomputer model, and the interface circuit model of supervisor and intercomputer is MAX238.

Described indoor set circuit constitutes: coaxial cable connects with ES200I integrated package input pin RFIN, with audio frequency and digital data transmission in ES200I, after filtering is amplified, signal enters the phase-locked loop modulation demodulator circuit respectively and carries out demodulation, the audio signal of demodulation enters the A unit of amplifying circuit, and the digital signal of demodulation then enters the B unit of amplifying circuit;

The output signal of A unit is that 8050 triode Q4 amplifies the back by the interface CZ2 tube of answering by model, and the output signal of B unit connects with the input of single-chip microcomputer after relatively through the C unit;

Send in the chip from the audio signal of microphone, after the phase-locked loop circuit modulation, output in the coaxial cable;

The output of single-chip microcomputer connects with the input of ES200I, and the phase-locked loop circuit that digital signal is sent in the chip is modulated, and outputs to then in the coaxial cable;

Model is 9013 triode Q3 composition switching circuit, the input of switching circuit connects with microphone through interface CZ2, output then connects with the input of ES200I, control end then connects with the control end of single-chip microcomputer, to judge the off-hook and the hook state of phone, control the powering on of microphone, power down, the operating state of decision ES200I chip voicefrequency circuit part;

Single-chip microcomputer also connects with key circuit, so that visitor's the request of entering is handled, it also connects with the interface of warning circuit simultaneously, so that external sensor carries out early warning.

Described doorway machine circuit structure is: coaxial cable connects with the input pin RFIN of ES200O integrated package, with audio frequency and digital data transmission in ES200O, after filtering is amplified, signal enters the phase-locked loop modulation demodulator circuit respectively and carries out demodulation, the audio signal of demodulation enters the A unit of amplifying circuit, and the digital signal of demodulation enters the B unit of amplifying circuit;

The output signal of A unit is that 8050 triode Q13 amplifies the back and passes through interface CZ2 and connect with microphone through model, and the output signal of B unit connects with the input of single-chip microcomputer after relatively through the C unit;

Microphone connects with the input of ES200O, will send in the chip from the audio signal of microphone, outputs in the coaxial cable after the phase-locked loop circuit modulation;

The output of single-chip microcomputer connects with the input of ES200O, and the phase-locked loop circuit that digital signal is sent in the chip is modulated, and outputs to then in the coaxial cable;

The input of switching circuit connects with microphone through interface CZ2, output connects with the input of ES200O, control end connects with the control end of single-chip microcomputer, so that judge the off-hook and the hook state of phone, control the powering on of microphone, power down, the operating state of decision ES200O chip voicefrequency circuit part;

Single-chip microcomputer also connects with key circuit and LED charactron circuit, so that visitor's the request of entering is handled, it also connects with the interface of display circuit simultaneously, so that show the image of the outsider;

Single-chip microcomputer also connects with the communication switch circuit control end of being made up of relay, and two I/O ends of communication switch circuit connect with coaxial cable, finish the signal and communication between supervisor and indoor set under Single-chip Controlling.

The circuit structure of described supervisor is: coaxial cable connects with the input pin RFIN of ES200M integrated package, with audio frequency and digital data transmission in ES200M, after filtering is amplified, signal enters the phase-locked loop modulation demodulator circuit respectively and carries out demodulation, the audio signal of demodulation enters the A unit of amplifying circuit, and the digital signal of demodulation enters the B unit of amplifying circuit;

The output signal of A unit connects microphone and computer sound card interface through interface CZ2, and the output signal of B unit connects with the input of RS232 interface circuit MAX238 after relatively through the C unit;

Microphone connects with the input of ES200M through interface CZ2, will send in the chip from the audio signal of microphone, outputs in the coaxial cable after the phase-locked loop circuit modulation, is sent to indoor set;

The interface circuit output connects with the input of ES200M, outputs in the coaxial cable after digital signal is modulated;

The input of switching circuit connects with microphone through interface CZ2, output connects with the input of ES200M, control end then connects with the control end of MAX238, so that judge the off-hook and the hook state of phone, control the powering on of microphone, power down, the operating state of decision ES200M chip voicefrequency circuit part;

Computer can pass through RS232 interface circuit MAX238, sends instruction to the ES200M chip, controls the operating state of its inner phase-locked loop circuit, to doorway machine and indoor set issuing command, and receives the indoor set signal of being transmitted by doorway machine.

The present invention utilizes PHASE-LOCKED LOOP PLL TECHNIQUE and narrow-band FM technology, at indoor set, the modulation integrated circuit that contains phase-locked loop circuit is installed in doorway machine and the supervisor, and corresponding amplifying circuit, single-chip microcomputer and interface circuit, totally control as host computer by computer, doorway machine is transmitted the communication between indoor set and supervisor, reached and only used a coaxial cable, can be at indoor set, carry out both-way communication between doorway machine and supervisor and to outside information gathering and processing, and obtain the purpose of electric power simultaneously, it is complicated to have simplified the wiring of existing like product greatly, and the problem of debug difficulties can be widely used in the intelligent management of sub-district.

Description of drawings

The invention will be further described below in conjunction with accompanying drawing and embodiment.

Fig. 1 is an overall structure block diagram of the present invention;

Fig. 2 is an indoor set circuit structure block diagram;

Fig. 3 is the indoor set circuit diagram;

Fig. 4 is a doorway machine circuit structure block diagram;

Fig. 5 is the doorway machine circuit diagram;

Fig. 6 is a supervisor circuit structure block diagram;

Fig. 7 is the supervisor circuit diagram.

Embodiment

Fig. 1 has provided overall structure block diagram of the present invention, coaxial cable links up indoor set, doorway machine and supervisor as only signal transmission passage, doorway machine is responsible for the forwarding of signal between indoor set and supervisor, supervisor connects with computer, whole device is carried out whole management and control, doorway machine, indoor set and supervisor are the frequency that adopts different-waveband when carrying out communication, and the present invention has adopted 6.5M, 10.7M, three fundamental frequency points of 15M that signal is transmitted.

Used the mode that phase-locked loop circuit and corresponding amplifying circuit etc. is packaged into integrated package among the present invention, integrated package after the encapsulation is by the difference of field of employment, the model that is divided into used for indoor machine is ES200I, the model that doorway machine is used is ES200O, the model that supervisor is used is ES200M, the connection of integrated package inside is: it has a radio frequency amplifier, connect respectively with simulation frequency-selecting filter and digital frequency-selecting filter, two filter connects with separately limiting amplifier again, carry out signal and amplify, the limiting amplifier output connects with the input of separately phase-locked loop modulation demodulator circuit respectively; Simultaneously, it also has two radio frequencies to amplify and switching circuit, the output of these two circuit connects with outside, its input then output with the 3rd phase-locked loop modulator-demodulator connects, another input then connects with the output of the first or second phase-locked loop modulator-demodulator, and three phase-locked loop modulation-demodulation circuits and two radio frequencies amplify and the control end of switching circuit can connect with external circuit.

Signal amplification circuit is divided into A, B, three unit of C, be that the operational amplifier of LM324 constitutes by model in each unit, wherein A unit IC2A is a negative feedback amplifier circuit, and it connects with the audio signal output end of modulation integrated circuit, carries out the amplification of signal; B unit IC2B is a negative feedback amplifier circuit, and it connects with the digital signal output end of modulation integrated circuit, digital signal is amplified, and the fixing DC bias of 2V; C unit IC2C is a voltage comparator, to carry out the threshold judgement of 2.5V from the output signal of B unit.

The formation of indoor set circuit such as Fig. 2, shown in Figure 3.Signal is sent into the 21st pin RFIN of ES200I by coaxial cable, the frequency-selective filtering of digital signal wherein in sheet, amplitude limit is amplified into phase-locked loop circuit and carries out demodulation, numeral after the demodulation is by the 30th pin RXD output of ES200I, digital signal connects the 6th pin of amplifying circuit B unit IC2B through coupling capacitance C17, carry out voltage ratio through amplified signal by the 9th pin that the output of the 7th pin enters amplifying circuit C unit IC2C, the 8th pin RxD of IC2C sends court verdict into the 2nd pin (P3.0) RxD that model is the single-chip microcomputer of 98C2051 then, thereby finishes the demodulating process of digital signal.

Audio signal after ES200I handles is then exported by the 26th pin VOICE of ES200I, connect the 2nd pin of amplifying circuit A unit IC2A through coupling capacitance C13, signal after the amplification is by its 1st pin output, connecing model and be 8050 triode Q4 base stage behind coupling capacitance C5 amplifies, patch interface CZ2 then, thereby finish the demodulating process of audio signal.

Need modulated digital signal to send into the 28th pin of ES200I, after the chip modulation, form another FM signal, output to coaxial cable, finish the modulation of digital signal by the 5th pin RFOUT by single-chip microcomputer the 3rd pin TXD.

The 14th pin MIC of ES200I connects with microphone through CZ2, to send among the ES200I by the sound that microphone transmits and modulate, form another FM signal, then the signal that modulates the 5th pin RFOUT by ES200I is outputed on the coaxial cable, finish the modulated process of voice signal.

Output the 1st pin of IC2A is that single-chip microcomputer the 7th pin MUTE of AT89C2051 connects with model also, is off-hook or hook state with judgement.

Simultaneously interface CZ2 also with+12V and+the 5V power supply connects, and is that the collector electrode of 9013 triode Q3 connects with model, the base stage of triode Q3 then connects with single-chip microcomputer the 7th pin MUTE, thus the formation switching circuit so that the powering on of microphone, power down are controlled.

When receiving the doorway machine calling, the 7th pin P3.3 control microphone of single-chip microcomputer powers on, and opens audio signal channel; The 8th pin P3.4D/A-CHANL of single-chip microcomputer puts logic level 0, and it connects with the 38th pin of ES200I, makes the chip internal phase-locked loop circuit of ES200I enter voice call state with the supervisor full duplex.

When receiving on-hook signal, the power down of the 7th pin P3.3 of single-chip microcomputer control microphone, the 8th pin P3.4 puts logic level 1, closes audio amplifier circuit, and the phase-locked loop circuit of control ES200I chip internal withdraws from full duplex voice call state.

The 15th, 16,17 pin of ES200I connect oscillating circuit, produce the signal of 6.5M; 18th, 19,20 pin connect oscillating circuit, produce the 10.7M signal.

The 4th, 5 pin of single-chip microcomputer connect the oscillating circuit of being made up of C12, C16 and C15 etc., the 3rd pin TXD connects the 28th pin of ES200I, the 6th pin R/S15 connects the 11st pin of ES200I, and the 11st pin is that the base stage of 8050 triode Q2 connects with model then, and the collector electrode of triode Q2 connects with the interface of display circuit.

The 12-19 pin connecting resistance row RB1 of single-chip microcomputer, wherein the 14th, 15 pin connect the memory IC 3 that model is AT2401.The 17-19 pin of single-chip microcomputer meets versatile interface CZ1, and it is used for connecting with external sensor, sends alarm command, the 1st pin of single-chip microcomputer and the 20th indirect capacitor C 18 in case the generation dangerous situation can in time produce alarm signal notice computer.

When doorway machine makes a call, call signal is sent the calls word instruction by the 3rd pin P3.1TXD of 89C2051, the 28th pin that outputs to ES200I is modulated into the 15MHz signal, the 6th pin R/S15 by single-chip microcomputer sends logic level 1 simultaneously, the 11st pin of the ES200I that control connects with it, make the interior digital phase-locking circuitry phase of sheet be in transmit status, the signal of modulation is by the 5th pin feed-in coaxial cable of ES200I.

Also have buzzer B2 in indoor set, it is that 9013 triode Q1 collector electrode connects with model, and the base stage of triode Q1 connects with single-chip microcomputer the 12nd pin HAND, and the while, buzzer B2 also connected with microphone switch, and switch also connects with single-chip microcomputer the 12nd pin.

Also having model in indoor set is 78L05 type three-terminal voltage-stabilizing power supply IC1, powers to indoor set; Model is that the transformer T2 of TRANS1 obtains voltage from coaxial cable, and voltage carries out filtering and powers to indoor set.

The structure of doorway machine is shown in Fig. 4,5.Signal is sent into by coaxial cable, and entering by model through coupling capacitance C23 is the emitter follower that 9018 triode Q14 forms, and its output is divided into three branch roads, connects three amplifying circuits respectively.Article one, branch road is after capacitor C 24, and the oscillating capacitance F1 of the living 6.5M signal of practicing midwifery connects model and be 1815 triode Q15 base stage then, and the collector electrode of triode Q15 meets the 1st pin A1 of ES200O; The second branch road connects model and is 1815 triode Q16 base stage behind the oscillating capacitance F2 of the living 10.7M signal of practicing midwifery after capacitor C 25, its collector electrode connects with the 27th pin A2 of ES200O; Article three, branch road is 1815 triode Q17 base stage for connect signal after coupling capacitance C26 and inductance L 2, and its collector electrode connects the 9th pin A3 of ES200O.

Digital signal in the coaxial cable is sent into the 9th pin of ES200O after triode Q17 amplifies after, phase-locked loop circuit in chip carries out demodulation, and by the 30th pin RXD exports then, connects the 6th pin of amplifying circuit B unit IC2B through coupling capacitance C28, carry out signal and amplify, fixedly the DC bias of 2V.Outputed to the 9th pin of amplifying circuit C unit IC2C then by the 7th pin, carry out the threshold judgement of 2.5V, court verdict is sent into single-chip microcomputer the 10th pin RxD that model is 98C51, the above-mentioned demodulating process of finishing digital signal.

Audio signal transmission when doorway machine and supervisor conversation, is sent into the 1st pin A1 of ES200O in two kinds of situation by triode Q15; When doorway machine and indoor set conversation, triode Q16 sends into the 27th pin A2 of ES200O.Audio signal is the phase-locked loop circuit demodulation in sheet, export by the 28th pin VOC, enter A unit IC2A input the 2nd pin of operational amplifier through coupling capacitance C19, it is that 8050 triode Q13 base stage is amplified that the output signal of IC2A connects model through capacitor C 21, amplified signal outputs to the interface CZ2 of microphone by its collector electrode, finishes the demodulating process of audio signal.

Need modulated digital signal to send into the 16th pin of ES200O, form another FM signal, output to coaxial cable, finish the modulation of digital signal by the 5th pin RFOUT by single-chip microcomputer the 11st pin TXD.

Microphone connects with interface CZ2, and the audio signal of its collection enters the 17th pin MIC of ES200O through capacitor C 22, and the modulation back is outputed on the coaxial cable by the 5th pin RFOUT.

Output the 1st pin of IC2A is that the 24th pin MUTE of the single-chip microcomputer of AT89C51 connects with model also, with the operating state of control microphone.

Interface CZ2 also with+12V and+the 5V power supply connects.Also connect with+branch road that 5V connects, constitute switching circuit, with the powering on of control microphone, power down with the 25th pin of single-chip microcomputer.

When receiving the supervisor calling, the 25th pin P2.4TALK control microphone of single-chip microcomputer powers on, the 24th pin P2.3MUTE opens audio signal channel, the 21st pin R/S1 puts logic level 0 (accepting state), output to the 7th pin of ES200O, the 22nd pin R/S2 puts logic level 1 (transmit status), outputs to the 18th pin of ES200O, thereby control ES200O chip internal phase-locked loop circuit enters and supervisor full duplex voice call state.

When receiving on-hook signal, the 25th foot control system microphone power down of single-chip microcomputer, the 24th foot control system audio amplifier circuit is closed, and the 21st, 22 pin are then controlled ES200O chip internal phase-locked loop circuit and are withdrawed from full duplex voice call state.

Single-chip microcomputer the 18th, 19 pin connect the oscillating circuit of being made up of capacitor C 36, C35, C37 etc., and the 9th foot meridian capacitor C50 connects+the 5V power supply, and the 37th pin is that the base stage of 8050 triode Q12 connects with model then, and the collector electrode of triode Q12 connects with the interface of display circuit.

The 39th pin of single-chip microcomputer connects door lock circuit, and this circuit is that 9012 triode Q7, model are that 8050 triode Q8 and triode Q10 form the interface CZ1 of the output device taking alarm of this circuit by model.

The 1-12 pin of single-chip microcomputer connects with LED displaying block and key circuit.

Also having model in doorway machine is 7805 type three-terminal voltage-stabilizing power supplys, to the doorway machine power supply, also has transformer T1 to connect with coaxial cable, obtains voltage, and voltage is carried out powering to doorway machine after the filtering.

Also have the signaling conversion circuit between supervisor and indoor set in doorway machine, it is controlled by relay, and its normally-closed contact connects with the coaxial cable that removes supervisor, and normally opened contact then connects with the coaxial cable that removes indoor set; Normally-closed contact is through coupling capacitance C29, with model is that the base stage of the emitter follower formed of 9018 triode Q19 connects, the emitter-base bandgap grading of triode Q19 is that the base stage of 1815 triode Q20 connects through capacitor C 30 and inductance L 5 and model then, and the collector electrode of triode Q20 then connects with the 32nd pin DATARX of ES200O.

Relay is that 9013 triode Q18 collector electrode connects with model then, and its base stage then connects with the 13rd pin MANAGER of single-chip microcomputer.

When doorway machine made a call, call signal went out digital command by the 11st human hair combing waste of single-chip microcomputer, outputed to the 16th pin of ES200O, was modulated into the 15MHz signal.Simultaneously, the 23rd pin R/S3 of single-chip microcomputer sends logic level 1, and the 14th pin R/S3 of control ES200O makes the interior digital phase-locking circuitry phase of sheet be in transmit status, and FM signal is by the 5th pin RFOUT feed-in coaxial cable of ES200O.

Under normal circumstances, doorway machine is in the state of receiving management machine and indoor set both direction digital signal for a long time, when supervisor or indoor set initiation connection request, the 13rd pin MANAGER output logic level 1 of single-chip microcomputer, drive relay K 1 adhesive by triode Q18, connect the communication link between this unit indoor set and the supervisor.

The circuit of supervisor such as Fig. 6, shown in Figure 7.Coaxial cable connects with the 27 pin RFIN of ES200M through coupling capacitance C53, and in ES200M, after filtering was amplified, signal entered the phase-locked loop modulation demodulator circuit respectively and carries out demodulation with audio frequency and digital data transmission.

The digital signal of demodulation is exported by the 31st pin RXD, and the 6th pin through coupling capacitance C46 enters the B unit IC2B of amplifying circuit carries out signal and amplifies, fixedly the DC bias of 2V; The output pin 7 of IC2B connects with the 9th pin of amplifying circuit C cell voltage comparator IC2C, carry out the 2.5V threshold voltage relatively, output signal connects the 6th pin that model is the interface circuit of MAX238 by the 8th pin, then by its 7th pin outputting standard RS232 level signal through 9 needle sockets the 3rd pin of RS232 to computer, finish the demodulation of digital signal.

Voice signal enters the 27th pin of ES2000M through coupling capacitance C53, after frequency-selective filtering amplifies, enter the phase-locked loop circuit demodulation, export by the 24th pin VOC, output signal enters the 2nd pin of amplifying circuit A unit IC2A through coupling capacitance C41, amplify, export through coupling capacitance C43 by the amplifying signal of the 1st pin output.Output signal is divided two-way, the first via connects the collector electrode that model is 9013 triode Q21, and the 4th pin TALK that its base stage meets MAX238 connects, and is outputed to the 7th pin of 9 cushion mouths then by the 3rd pin C-TALK of MAX238, output to computer sound card by the 7th pin, finish the demodulation of voice signal.

The 4th pin TXD that external digital signal enters ES200M modulates, and the signal after the modulation is exported by the 5th pin RFOUT, finishes the modulation of digital signal.

Microphone connects with interface CZ2, and the audio signal of its collection outputs to ES200M after capacitor C 44 couplings the 39th pin MIC modulates, and the signal after the modulation outputs to coaxial cable by the 5th pin RFOUT, finishes the modulation of audio signal.

The CZ2 interface also connects with the 4th pin of MAX238, when host computer answers the call, control signal goes out logic level 0 by 9 needle socket RTS the 7th human hair combing waste of RS232, the 4th pin by change-over circuit MAX238 meets CZ2, thereby powering on of control microphone, open audio signal channel, the phase-locked loop circuit of control ES200M enters full duplex voice call state; When the host computer on-hook, control signal goes out logic level 1 by 9 needle socket RTS the 7th human hair combing waste of RS232, the 4th foot control system microphone power down by RS232 interface conversion circuit MAX238, close audio signal channel, phase-locked loop circuit in the control ES200M withdraws from accepting state, and this has constituted switching circuit.

The 11st, 12,13 of ES200M connects the oscillating circuit of 10.7M, and the 16th, 17,18 connect the oscillating circuit of 6.5M.The 33rd pin connects the 22nd pin of MAX238, and the 4th pin connects the 5th pin of MAX238.

When the host computer active call, call signal goes out the calls word instruction by 9 needle sockets the 3rd human hair combing waste of RS232, enters through 7 pin of MAX238, and the 4th pin that is outputed to ES200M by 6 pin is modulated into the 15MHz signal.Simultaneously, go out logic level 1 by the 4th human hair combing waste of RS232, the 33rd pin of the 22nd foot control system ES200M by MAX238 makes that the digital phase-locking circuitry phase is in transmit status in the sheet, and FM signal is by the 5th pin feed-in coaxial cable of ES200M.

When taking place as reporting to the police, after the single-chip microcomputer of indoor set detects, this signal is modulated into feed-in coaxial cable behind the 15MHz, be transferred to supervisor through doorway machine, enter through the 27th pin of the ES200M of supervisor and to carry out demodulation in the sheet, restituted signal is by the 31st pin output of ES200M, through the 6th pin of MAX238, convert the RS232 fiduciary level to, insert computer by the 7th pin.

Claims

1, a kind of intellectual communityintellectualized village video intercom device, it mainly is made up of devices such as indoor set, doorway machine and supervisors, it is characterized in that: above-mentioned each device communication and/or electric power transfer used medium to each other only is a coaxial cable, signal transmission between indoor set and supervisor is transmitted by doorway machine, and supervisor then connects with computer.

2, intellectual communityintellectualized village according to claim 1 video intercom device is characterized in that: all comprise signal amplification circuit, modulation integrated circuit and the single chip circuit of handling coaxial cable institute transmission signals in indoor set and doorway machine device; In the supervisor device, contain amplifying circuit and the modulation integrated circuit of handling coaxial cable transmission data, and the interface circuit that connects with terminal computer.

3, intellectual communityintellectualized village according to claim 2 video intercom device, it is characterized in that: described signal amplification circuit is divided into A, B, three unit of C, each unit is the operational amplifier formation of LM324 by model, wherein A unit IC2A is a negative feedback amplifier circuit, it connects with the audio signal output end of modulation integrated circuit, carries out the amplification of audio signal; B unit IC2B is a negative feedback amplifier circuit, and it connects with the digital signal output end of modulation integrated circuit, digital signal is amplified, and the fixing DC bias of 2V; C unit IC2C is a voltage comparator, to carry out the threshold judgement of 2.5V from the output signal of B unit.

4, intellectual communityintellectualized village according to claim 2 video intercom device, it is characterized in that: described modulation integrated circuit is the integrated package of encapsulation, the model of used for indoor machine is ES200I, the model that doorway machine is used is ES200O, the model that supervisor is used is ES200M, constituting of its chip internal: it has a radio frequency amplifier, connect respectively with simulation frequency-selecting filter and digital frequency-selecting filter, two filter connects with separately limiting amplifier again, carry out signal and amplify, the limiting amplifier output connects with the input of separately phase-locked loop modulation demodulator circuit respectively; Simultaneously, it also has two radio frequencies to amplify and switching circuit, the output of these two circuit connects with outside, its input then output with the 3rd phase-locked loop modulator-demodulator connects, another input then connects with the output of the first or second phase-locked loop modulator-demodulator, and three phase-locked loop modulation-demodulation circuits and two radio frequencies amplify and the control end of switching circuit can connect with external circuit.

5, intellectual communityintellectualized village according to claim 2 video intercom device, it is characterized in that: described used for indoor machine single-chip microcomputer model is AT89C2051, and doorway machine is 89C51 with the single-chip microcomputer model, and the interface circuit model of supervisor and intercomputer is MAX238.

6, according to claim 1 or 2 or 3 or 4 or 5 described intellectual communityintellectualized village video intercom devices, it is characterized in that: described indoor set circuit constitutes: coaxial cable connects with ES200I integrated package input pin RFIN, with audio frequency and digital data transmission in ES200I, after filtering is amplified, signal enters the phase-locked loop modulation demodulator circuit respectively and carries out demodulation, the audio signal of demodulation enters the A unit of amplifying circuit, and the digital signal of demodulation then enters the B unit of amplifying circuit;

7, according to claim 1 or 2 or 3 or 4 or 5 described intellectual communityintellectualized village video intercom devices, it is characterized in that: described doorway machine circuit structure is: coaxial cable connects with the input pin RFIN of ES200O integrated package, with audio frequency and digital data transmission in ES200O, after filtering is amplified, signal enters the phase-locked loop modulation demodulator circuit respectively and carries out demodulation, the audio signal of demodulation enters the A unit of amplifying circuit, and the digital signal of demodulation enters the B unit of amplifying circuit;

8, according to claim 1 or 2 or 3 or 4 or 5 described intellectual communityintellectualized village video intercom devices, it is characterized in that: the circuit structure of described supervisor is: coaxial cable connects with the input pin RFIN of ES200M integrated package, with audio frequency and digital data transmission in ES200M, after filtering is amplified, signal enters the phase-locked loop modulation demodulator circuit respectively and carries out demodulation, the audio signal of demodulation enters the A unit of amplifying circuit, and the digital signal of demodulation enters the B unit of amplifying circuit;

The interface circuit output connects with the input of ES200M, outputs in the coaxial cable after the digital signal that computer is sent is modulated;