CN2504855Y - Decoder for building talkback and information system - Google Patents

Abstract

The utility model relates to a decoder used in video interphones and information releasing systems for buildings, which uses a 51 series SCM as a central processing unit IC1 so as to send, receive and decode data in a system and detect and control indoor machines. A communication circuit is composed of the IC1, a digital logic chip IC6 and electric level conversion chips IC7 and IC8, and an indoor machine test circuit is composed of a comparator which is composed of the IC1, a multichannel switch chip IC4 and a chip IC3. A control circuit is composed of the IC1, the digital logic chip, a driving chip, a relay, etc., so as to drive a video distributor and a bell signal generating circuit which is composed of the IC1, a phase inverter chip and a triode. The system stably runs by adopting the 51 series SCM, and the extension is simple and the maintenance is convenient due to the modular design. The utility model has the advantages of long transmission distance and strong interference rejection because of the adoption of a 485 bus communication mode, and is suitable for building systems in various types at subzones.

Description

The decoder of building talkback and information system

Technical field:

The utility model relates to building visual to a kind of electronic equipment in the information issuing system of making peace, particularly a kind of decoder.

Background technology:

In building visual intercom system device, decoder is the core, is linking intrasystem other electronic equipment, is a critical component.In the open source information of existing building conversational system, seldom be mentioned to decoder.In the disclosed file of Chinese patent ZL99209117.9 " CPU building talkback automatic switch-board ", this switch has comprised double-tone decoder frequently, and its function is limited, only disclose this decoder and used IC8870, and the position in a simple circuit figure.Just there has not been more information in addition.No. 94100458.9, patent application " multifunctional household video intercom warning system "; disclosed technical information is just simpler; in the middle of do not see and mentioned the employing decoder; the control circuit of an imaging circuit, display circuit is only disclosed; the automatic control circuit of an overvoltage protection; with a warning circuit, be the less simple circuits of a little functions.

Summary of the invention:

The purpose of this utility model be to avoid weak point of the prior art and provide a kind of in building conversational system, transmission that can realize data receive the decode function, and can be simultaneously many indoor sets be carried out and detect and the decoder of control.

The purpose of this utility model can reach by following measure:

Decoder in building talkback and information system, electronic equipment such as the supervisor by the doorway machine in data/address bus and the system, indoor set, center, PC is connected.This decoder is made up of with relevant chip, module, electronic component central processing unit.With 51 series monolithics as central processing unit, i.e. CPU, burning has the control program that is designed voluntarily by the designer on single-chip microcomputer.This CPU IC1 is connected with the control binding post of 8 indoor sets at the most by digital logic chip; By the multi-channel switch chip detection binding post of 8 indoor sets of CPU IC1 and as many as is connected; And, realize that CPU IC1 is to each indoor set status detection through an operational amplifier chip of forming by four groups of comparators; The director data that indoor set sends is received the multi-channel switch chip through the detection binding post of this indoor set, through comparator reception, processing, CPU IC1 identification, sends instruction to data/address bus again, by control circuit, controls corresponding external equipment action.

Data transmit-receive circuit on from central processing unit IC1 to 485 data/address buss, comprise by CPUIC1 to digital logic chip IC6, again respectively through two level transferring chip, be connected on the data/address bus, or be connected on the data/address bus binding post that is connected to alarm, the level of the alarm signal data that the call data that one of them conversion is received and dispatched on the bus and the level of monitoring data, conversion are received and dispatched.

The control circuit of decoder is made up of central processing unit, digital logic chip, chip for driving, relay etc., receives the video distributor binding post, with the opening or quitting work of control of video distributor, or the on/off of control audio circuit.Wherein, chip for driving offers drive current so that the relay adhesive, and control opens video distributor, or indoor set tone frequency channel wire and audio-frequency bus are connected, the driving voicefrequency circuit.

Bell signal generation circuit comprises CPU IC1, inverter chip and triode; Receive inverter by CPU IC1 through diode, control inverter and switching tube produce ringing tone signal, deliver on the ringing tone signal binding post BELL.The frequency of the ring back tone that is produced can be adjusted by the resistance, the capacitor parameters value that change on the circuit.

Central processing unit also is connected with a crystal oscillator: also can connect a memory chip.

The utility model device has following advantage:

1, employing is powerful, and the 51 stable series monolithics and the combination of each module make system's operation more stable;

2, adopt modularized design, function can be selected arbitrarily, and expansion is simple, easy to maintenance;

Characteristics such as 3, employing 485 bus system communication modes have long transmission distance, anti-interference strong, and locking equipment quantity and kind are many.

Description of drawings:

Accompanying drawing is the utility model decoder circuit schematic diagram, and among the figure, IC is chip (single-chip microcomputer), and Q is that triode, D are that diode, RL are that relay, X are that crystal oscillator, R are that resistance, C are electric capacity, symbol The expression binding post, the implication of each binding post is: CON is that ring, VIDEO are that video distributor control, SPK are that loud speaker, MIC are microphone for control, USR for detection, BELL, and 485A, 485B are data/address bus; OUT represents to pick out, IN represents to insert; 5V represents 5 volts of power supplys.

Embodiment:

51 series monolithic 89C52 are adopted in the core of the utility model decoder, and item is IC1, and as central processing unit (CPU), CPU IC1 is connected with other electronic devices and components, forms data transmit-receive circuit, detection, control circuit respectively, signal generating circuit.Control circuit comprises CPU IC1, digital logic chip IC2, and the chip for driving IC5-B of control relay, the chip for driving IC5-A of control of video distributor VIDEO, testing circuit comprises CPU IC1, multi-channel switch chip IC 4 (adopting 8 way switch chips), comparator chip IC 3-A, IC3-B, IC3-C and IC3-D.The data transmit-receive circuit also claims communicating circuit, comprises CPU IC1, digital logic chip IC6, level transferring chip IC7 and IC8 and 485 bus interface terminal 485A, 485B and 485A ', 485B '.Bell signal generation circuit is by CPU IC1, diode D2, inverter chip IC 9-B, IC9-A, IC9-C, triode Q1 and Q2, and resistance, electrical equipment are formed accordingly.

As shown in drawings, be core with CPU IC1, corresponding respectively 14 pin, 11 pin and 12 pin that meet digital logic chip IC2 of 31 pin of IC1,32 pin, 33 pin.1 pin to 7 pin of IC2, and 15 pin, the corresponding respectively control binding post CON1 to CON8 that connects 8 indoor sets.

Control circuit connects 3 pin of a set drive IC5-B of chip for driving by 1 pin of CPU IC1, and 4 pin of IC5-B are divided into two-way, and one the road succeeds the control end of electrical equipment RL1, and the second the tunnel receives another control end of relay through diode D1.Two groups of switches of relay, an end meets audio-frequency bus binding post SPK-OUT and MIC-IN respectively, another termination indoor set audio interface terminal MIC and SPK.Another set drive of chip for driving IC5-A connects 13 pin of CPU IC1 with its 1 pin, and its 2 pin meets the control binding post VIDEO-CON of video distributor.

Testing circuit connects 11 pin, 10 pin, 9 pin of multi-channel switch chip IC 4 respectively by 18 pin, 19 pin, 20 pin of CPU IC1.13 pin of IC4,14 pin, 15 pin, 12 pin, 1 pin, 5 pin, 2 pin, 4 pin connect each indoor set respectively and detect binding post USR1 to USR8.And 3 pin of IC4 are divided into 4 the tunnel, and 5 pin, the 4 tunnel that 10 pin, the 3 tunnel that the 1 tunnel 12 pin, the 2 tunnel that meet IC3-D meet IC3-C meet IC3-B connect 3 pin of IC3-A; 14 pin of IC3-D connect 22 pin of CPU IC1, and 7 pin that 8 pin of IC3-C meet 23 pin of IC1, IC3-B connect 24 pin of IC1,1 pin of IC3-A connects 25 pin of IC1.

Bell signal generation circuit connects the pin of diode D2 by 44 pin of CPU IC1, and another pin of D2 links to each other with 5 pin of inverter chip IC 9-B, be divided into 2 the tunnel behind the 5 pin connecting resistance R1 of IC9-B, and the 1 the tunnel connects 4 pin of IC9-B and 3 pin of IC9-A through resistance R 2; The 2 tunnel 7 pin and 2 pin of IC9-A, 6 pin of IC9-C of receiving IC9-C after capacitor C 2 connect the base stage of triode Q1, and the ring binding post BELL that the collector electrode that the base stage of the grounded emitter of Q1, collector connecting transistor Q2, the emitter of Q2 connect 12V positive supply, Q2 is received indoor set gets on.

Communicating circuit is connect 14 pin and 7 pin of digital logic chip IC6 by 2 pin of CPU IC1,7 pin of IC1 connect 9 pin and 16 pin of IC6,2 pin of IC6 connect 2 pin and 3 pin of level transferring chip IC7,4 pin of IC6 connect 4 pin of IC7,6 pin of IC6 connect 1 pin of IC7,11 pin of IC6 connect 4 pin of another level transferring chip IC8,13 pin of IC6 connect 1 pin of IC8,17 pin of IC6 connect 2 pin of IC8,3 pin, the 5 pin ground connection of IC7, its 8 pin connects the 5V positive supply, and by capacitor C 1 ground connection, 6 pin of IC7,7 pin are received the binding post 485A of 485 data/address buss of system respectively, 485B, the 5 pin ground connection of IC8,8 pin connect the 5V positive supply, and by capacitor C 3 ground connection, 6 pin of IC8,7 pin are received the 485 bus interface terminal 485A ' that are connected to alarm respectively, 485B '.

In addition, 14 pin of central processing unit IC1,15 pin connect two foots of crystal oscillator X1 respectively, and respectively through capacitor C 4, C5 ground connection.

Below, be described in further detail the operation principle of the utility model decoder by standby, calling, three kinds of states of supervision.

1, powers on and holding state

System starts working at the back CPU IC1 that connects with the mains, and finishes a program running for about 5 milliseconds.The 13 pin output low levels of IC1 during standby are exported high level to the VIDEO-CON binding post through 2 pin of chip for driving IC5-A, and the control of video distributor quits work.On the other hand, the 1 pin output low level of IC1, through 4 pin of chip for driving IC5-B, the output high level is to relay R L1, and at this moment, audio-frequency bus SPK-OUT, MIC-IN and indoor set tone frequency channel wire binding post SPK, MIC disconnect, and play the effect that audio frequency is isolated.

31 pin of CPU IC1,32 pin, 33 pin are by certain logical relation, and 8 pin such as 15 pin of control figure logic chip IC2,1 pin to 7 pin are exported respectively on the control binding post CON1 to CON8 of high level to 8 indoor set; The control indoor set is not worked.

2, external equipment is called out indoor set

When on 485 buses call data being arranged,, change mutually with Transistor-Transistor Logic level by level transferring chip IC7, carry out logic control through digital logic chip IC6, CPU IC1 receives and identifies, judges, is not resident family's room number of this decoder control as what call out, and decoder does not deal with; A certain room number in 8 families in this way, and, by multi-channel switch chip IC 4, comparator with IC3-A etc. is formed detects this resident family and is in idle condition, then 44 pin of IC1 output high level, produce ringing tone signal through inverter and switching tube Q1, Q2, deliver to the wiring pillar of ring BELL.IC1 is by certain logical relation, and control figure logic chip IC2 in the output pin output low level of correspondence, to the control binding post CON at this family, starts working the indoor set at this family, sends ring back tone.

Simultaneously, 13 pin of IC1 output high level is to chip for driving IC5-A, and to the VIDEO-CON binding post, video distributor is opened in control through the IC5-A output low level.At this moment, there is the people to reply the machine of carrying as this resident family, CPU IC1 is after IC circuit 4, IC5 detect after testing, 1 pin output high level at IC1, through the IC5-B output driving current, drive relay R L1 adhesive, external audio bus and indoor set tone frequency channel wire are connected, and send the data of off-hook to 485 data/address buss by IC6, IC7, handle accordingly with other equipment on the notice bus.

3, monitor from indoor set

When certain resident family needs from indoor set supervision front door situation, press the supervision button of this machine, CPU IC1 is by IC4 and the comparator be made up of IC3-A etc., detecting this button in cycle at working procedure is pressed, by IC6, IC7, monitoring data is sent on 485 data/address buss, and the instruction doorway machine is opened camera.IC1 makes the control terminals of this family indoor set by the logic control of IC2 simultaneously, output low level, and the control indoor set is started working.

Concern determined working procedure by above annexation and internal structure, constitute the utility model decoder.

Claims (5)

1, the decoder of a kind of building talkback and information system, formed with relevant chip, module, electronic component by central processing unit, it is characterized in that, also include communicating circuit, control circuit, testing circuit and signal generating circuit, be connected respectively on the central processing unit, communicating circuit is used for linking to each other with data/address bus, control circuit is used for the control audio bus, testing circuit is used to detect indoor set, signal generating circuit is used to produce ringing tone signal, with 51 series monolithic IC1 as central processing unit (CPU).

2, the decoder of building talkback according to claim 1 and information system is characterized in that, this CPU IC1 is by digital logic chip IC6, be connected with data/address bus through level transferring chip IC7; Through level transferring chip IC8, be connected, all constitute communicating circuit with the data/address bus that is connected to alarm; Control circuit is by CPU IC1, receive video distributor binding post (VIDEO-CON) through digital logic chip IC5-A; And by CPU IC1 through driver chip IC5-B, diode D1, be connected to relay (RL1), by the connection or the partition of relay control indoor set tone frequency channel wire and audio-frequency bus.

3, the decoder of building talkback according to claim 1 and 2 and information system, it is characterized in that, by the processing of CPU IC1 via four groups of comparators of chip IC 3-A, IC3-B, IC3-C, IC3-D, through multi-channel switch chip IC 4, be connected to the detection binding post of each indoor set, realize that CPU IC1 is to each indoor set status detection.

4, the decoder of building talkback according to claim 1 and 2 and information system, it is characterized in that, form bell signal generation circuit by central processing unit, inverter and triode, promptly by CPU IC1, through diode D2, receive inverter chip IC 9-B, IC9-A, IC9-C, control inverter and triode Q1, triode Q2, produce ringing tone signal, deliver to bell signal binding post (BELL) and go up and form.

5, the decoder of building talkback according to claim 3 and information system, it is characterized in that, form bell signal generation circuit by central processing unit, inverter and triode, promptly by CPU IC1, through diode D2, receive inverter chip IC 9-B, IC9-A, IC9-C, control inverter and triode Q1, triode Q2, produce ringing tone signal, deliver to bell signal binding post (BELL) and go up and form.

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