CN2867745Y - Wired and wireless receiving and refuting device making intercom phone - Google Patents

Abstract

The utility model discloses a wire-wireless connector for achieving telephony with interphone and is suitable for simplex-duplex walkie-talkie, especially for simplex walkie-talkie of any type and any frequency band via a simple interface. The utility model adopts MT8888 DTMF to receive and transmit signals, can realize second dial-up and can communicate with microcomputer via RS232 interface to achieve intranet connection of walkie-talkies and microcomputer management on the walkie-talkies. By adopting VOX sound control circuit, a walkie-talkie connected with the connector can be converted from simplex mode to quasi-duplex mode. The unit circuit is stable and reliable and can filter background noise to achieve high interference resistance. A walkie-talkie connected with the connector can be used for transferring telephony, calling, and dialing.

Description

The wire and wireless connector that allows intercom make a phone call

Technical field

The utility model relates to a kind of servicing unit of wireless interspeaker, specifically is a kind of wire and wireless conversion equipment that increases wireless talkback function phone functions.

Background technology

Wireless interspeaker is easy to use with it, networking flexibility, and conveniently moving, speech range is far away etc., and characteristics are subjected to liking of people.The particularly opening of citizens' radio band, more universal in recent years, close very much office, enterprise and institution are extensive use of.But blemish in an otherwise perfect thing is that intercom only only limits to the internal range intercommunication function, can not enter phone network, can't connect landline telephone or mobile phone, has influenced its scope of application.

Still there is not at present a kind of device that wireless interspeaker is inserted landline telephone.

The utility model content

The purpose of this utility model provides a kind of wire and wireless connector that allows intercom make a phone call, the utility model and an intercom are coupled together, again connector is inserted telephone wire, this intercom can use as Telephone set, remaining intercom can be made a phone call and receive calls, and becomes transportable cell-phone.

The technical solution of the utility model is as follows:

A kind of wire and wireless connector that allows intercom make a phone call, comprise electronic circuit, it is characterized in that outside line process busy relay difference accessing to audio coupling transformer and polar switching full-bridge, insert constant-current source, before ring detecting circuit is connected on busy relay; Ring detecting circuit is made up of triode Q01, Q02, optocoupler U51, one the tunnel through coupling capacitance C001, resistance R 001, the first level led positive pole of voltage stabilizing didoe DS001, diode D002 access optocoupler, the negative pole of optocoupler primary diode is inserted on another road respectively, with diode D001, the phototriode collector electrode of optocoupler connects power supply, and emitter connects secondary access electronic switching circuit; The collector electrode of the Q02 triode of electronic switching circuit divides two the tunnel, and one meets the P3.3 of single-chip microcomputer, the P2.7 mouth, and it two connects the D009 diode cathode, is linked into R008 resistance one end again, is delivered to the base stage of Q03 triode again by the R008 other end; Loud speaker meets double-tone coder and decoder ic MT8888 frequently, connect the C end of audio frequency coupling transformer by another road, the base stage of the #8 pin DTM double-tone of MT888 output access frequently double-audio signal amplifying triode 2N5551, the collector electrode of 2N5551, emitter are connected on anode and the negative terminal of constant current Heng Yuan respectively; Crystal oscillator inserts the 6th, 7 two pin of MT8888, MT8888 inserts the P0.0-P0.3 mouth line of single-chip microcomputer 89C51, single-chip microcomputer 89C51 inserts 12M reference clock crystal oscillator, the audio signal of outside line is sent into LM567 earlier and is amplified, the #8 pin of signal audio frequency detecting unit LM567 inserts the P2.6 mouth of single-chip microcomputer 89C51, and the level output pin P2.6 of single-chip microcomputer 89C51 inserts the base stage of Q511 triode; The non-earth terminal accessing to audio amplification circuit LM386 of the secondary winding of audio frequency coupling transformer, audio frequency amplification circuit LM386 output audio signal inserts acoustic control VOX testing circuit, acoustic control VOX testing circuit is made up of time-base circuit NE555 etc., the level of NE555-#3 pin is delivered to relay K 01 its adhesive of control, disconnection, control the intercom transmit-receive switch PTT of base again, thereby realized VOX acoustic control state, VOX acoustic control change-over circuit inserts anti-twitter circuit; Power subsystem, output+8V ,+5V ,+5V1 ,+12V, be respectively LM386, single-chip microcomputer 89C51, MT8888, LM567, relay K L20, relay K 01, LM324, NE555 power supply is provided; Form noise elimination triggering level SQL testing circuit by four-operational amplifier LM324, triode Q05, Q06, this testing circuit is exported high and low level, wherein one road level inserts the base stage of Q04 triode, the collector electrode of Q04 triode inserts the base stage of Q03 triode, the collector electrode of Q03 triode inserts an end of the work winding of PTT control relay, and the base stage of Q03 triode is inserted on another road through diode D011; The non-earth terminal of the secondary coil of audio frequency coupling transformer inserts transmitter socket JP04, is received three pin of transmit-receive switch PTT respectively by three contacts of K01 relay; The SQL testing circuit inserts the leading-in end of noise elimination triggering level.

The utility model is applicable to single duplexing intercom, is particularly useful for single worker's intercom, and is simple with the interface of intercom, general, is applicable to the intercom of any model, any frequency range.

The utility model adopts MT8888 double-tone sending and receiving frequently number and can realize two-stage dialing, can with microcomputer by the RS232 interface communication, realize the networking of intercom extension set, computer management.

The VOX sound control circuit that the utility model adopts realizes that " base intercom " the single worker's pattern that is connected with connector transfers quasi-duplex to, and this element circuit is stable, reliably, also can effectively filter some background sounds, strong interference immunity.

Anti-impulse disturbances circuit of the present utility model effectively excludes the fixed station intercom and disturbs the VOX electric circuit inspection circuit erroneous action that is caused by the suddenly disappear hard pulse that brought of radiofrequency signal in a flash by what emission state transferred accepting state to; When fixedly the moment of intercom transfers cancellation prefix, the speech phenomenon that the state of sending out reduces the control of VOX circuit to.

This connector is easy to connect, and is stable and reliable for performance, easy to operate, and the intercom that wherein is connected with connector is used as Telephone set, and major function is the transfer phone, throws into, transfers to, inner intercommunication; Remaining intercom, its function is: inner intercommunication, dialing are got, receive calls free.

In addition:

One, do not possess the DTMF number of sending out function as the intercom that is used to move, can select the DTMF signaling box annex of my exploitation for use, the MIC transmitter that only needs during use its back side sound hole to be aimed at mobile intercom gets final product.

Two, the composition of scm software and workflow:

1, the control of initialization MT8888 is provided with registers such as state, T0, T1, INT0, INT1 interrupt resources.

2, the DTMF sign indicating number of AT89C51 read/write MT8888 (4 binary-coded decimals) module.

3, inspection number (DTMF sign indicating number), password are examined (4) and are given establish whether consistent, and whether " # sign indicating number " is then to reach the standard grade in inspection, and inspection dialing tone, signaling are waited for busy tone or " * " key, the on-hook of rolling off the production line, and 4 T0, T1, these 4 interruptions of IT0, TNT1 therebetween all participate in work.

Description of drawings

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

Fig. 2 is two of the utility model circuit diagram.

Fig. 3 is three of the utility model circuit diagram.

Fig. 4 is the utility model operation principle block diagram.

Embodiment

Referring to Fig. 1-Fig. 4.

Circuit theory is as follows:

1. outside line inserts constant-current source and audio loop (audio frequency coupling transformer), polar switching full-bridge by busy relay.Before ring detecting circuit is connected on busy relay.The audio frequency coupling transformer mainly plays the audio frequency in the outside line is sent and receives, the audio signal in the outside line such as voice, signal tone, insert connector and also send out, voice that again mobile intercom sent then, audio signals such as dtmf dialing double-tone frequency are delivered in the outside line.Ringing circuit is made up of NPN triode Q01, PNP triode Q02, optocoupler U51, play the ringing-current detection effect, control connector ptt switch control relay again, send bell signal, point out mobile intercom to receive calls, mobile intercom need be pressed the * key, and forms Darlington transistor by QZ02, QZ03 and deliver to the 89C51-P2.7 mouth after anti-phase, the P3.3 mouth is controlled the adhesive of KL20 relay again for the P1.0 mouth by high level of single-chip microcomputer processing output and is reached the standard grade.Constant-current source part is made up of QZ01 etc., provide a constant load to outside line, thereby make the voice flow in the outside line that inserts connector stable, be unlikely to allow the programme-controlled distance of connector and outside line indefinite and the variation of the voltage of the circuit after the load, the Strength Changes of audio frequency, signal and instability take place.

2. the unit is that MT8888 and peripheral cell are formed, the double audio code of understanding mobile intercom is converted to binary-coded decimal, issue single chip computer AT 89C51 and by its processing, comprise and reading in, line code on the authentication password, and store and send back to MT8888 with the binary-coded decimal form again, except password, the # key, also synthesize analog signal promptly corresponding to the double-tone frequency DTMT sign indicating number of BCG sign indicating number by software control, export by the NT8888-#8 pin in inside, go out amplifier tube 2N5551 and the peripheral buffer amplifier circuit of forming, deliver in the outside line again.

The Mcu-AT89C51 unit is responsible for MT8888 read/write double-tone frequency binary-coded decimal, identification busy tone, " * key, " " # key ", and judge that authentication issues the fixedly password of intercom by mobile intercom, and also to busy relay control, the realization LINE operation of reaching the standard grade and roll off the production line.

3. LM567-#8 pin level is sent into a certain I/O mouth of AT89C51 line P2.6, P1.1 handles, Mcu is that the duty of high-low level judges that recently busy tone still is hum (dialing tone) according to the level state of LM567-#8 pin, busy tone in this way, then the P1.0 by 89C51 drags down, relay K 01 disconnects, connector is taken out stitches, hum (dialing tone) is dialing procedure in this way, promptly working as busy relay connects in a flash, system is judged to be had behind this dialing tone promptly by the 89C51 Single-chip Controlling to the outside line signaling, as connector reach the standard grade the back dial-up success after, ring-back tone is uploaded in outside line, and send to mobile intercom by fixing intercommunication and answer, this moment as phone side's off-hook of being dialed, mobile intercom can be set up conversation with the phone side that is dialed, when the need on-hook, can press " * " key or be connect and occur busy tone in the outside line by fixed station, get final product automatic hand-up (89C51-P2.6, P1.1 detects) process of answering is as follows: when outside line is thrown into, fixed station shakes a bell by 2.7 mouthfuls of AT89C51P, the P3.3 mouth detects, this moment the connector automatic off-hook, this moment fixed station duty personnel and outside line conversation earlier, wait to know that the mobile extension (promptly mobile intercom) that will look for promptly informs the travelling carriage of being dialed by the duty personnel, conversation is set up in travelling carriage and fixed station or outside line, and after this hooks on process is the same with the on-hook of above placement process.

4. VOX acoustic control change-over circuit, form by NE555 etc., this element is the core of this connector, it can change the quasi-duplex intercom into being used for that intercom that base is connected with connector, its principle is that the audio signal of outside line is sent into the LM567 amplification earlier, send into Q380 again, NE555-#6, the #7 pin, it is threshold voltage foot control system, the voice corresponding in the outside line of the level of NE555-#3 pin " 1 " or " 0 " have stateless, again the level of NE555-#3 pin is delivered to relay K 01 its adhesive of control, disconnect, control the intercom ptt switch of base again, thereby realized VOX acoustic control state, make to recognize to be in emission state when the machine intercom has the language sound of speech in outside line, be in the state of answering during no sound of speech, realize VOX acoustic control function.

5. power subsystem, output+5V ,+5V1 ,+12V ,+8V.

6. electric LM324, Q05, compositions such as Q06, the SQL testing circuit, introduce from the JPZ seat, its function or act on following two kinds, SQL end is the fixing noise elimination triggering signal of intercom, export a level when promptly fixedly intercom is in accepting state and receives the radiofrequency signal (RF) that mobile intercom sends under current frequency, give LM324-#9 by JPZ, by LM324-#8 output high level, give Q05 again, Q06, by Q06-C utmost point output high level, this high level divides two-way, one the tunnel gives by Q07, the electronic switch that Q08 forms, by the Q08-C level, the output high level is received Q03-b by D011 and is extremely gone up, at this moment seem the adhesive of K01 energy, but the positive pole of D101 is delivered on another road, be added to the Q04-b utmost point again, Q04 is satisfied close conducting, the Q04-C utmost point extremely links to each other with Q03-b again, make Q03 end not adhesive of K01 this moment, K01 is that the ptt switch control relay is failure to actuate, the audio loop of the connector that is incorporated into and various audio signals one that the outside line on the connector is introduced are started to control the VOX circuit and are made the K01 adhesive when having avoided this moment because mobile machine " is sent out " fixed station " receipts ", ptt switch is opened, the fixed station intercom also is in a kind of like this both sides of " sending out " state all at " sending out " state, thereby miss abnormal phenomenon of conversation, be very necessary by the such circuit kit role of SQL detecting unit this moment, and it allows intercom that fixed station connects and the mobile intercom can only be that a side " sends out ", the opposing party's " receipts " has guaranteed work stable of connector, reliably.And after mobile intercom is unclamping ptt switch, then the level that is caused on the LM324-#9 pin by JPZ disappears, LM324-#8 pin degree low level, Q06-C utmost point step-down, Q04-b utmost point step-down, Q04 ends, the effect of CS88 lost blockade, seen the C utmost point of Q08 again, owing to could disappear after can postponing a period of time to Q03, therefore the high level extremely gone up of Q08-C still is added to Q03-b by D011 and extremely goes up, make that Q03 is full to close conducting, the K01 adhesive makes ptt switch connect that (promptly fixedly intercom PTT presses, be in emission state, be similar to VOX circuit role).

7. this element is " anti-shake " circuit, form by 2P4M, Q13-Q15 etc., it belongs to anti-impulse disturbances circuit unit, can exclude effectively fixing intercom by emission state transfer to accepting state in a flash by the VOX testing circuit misoperation that the hard pulse that is brought disturbs (falsetto frequently) to be caused that disappears of the strong signal burst of radio frequency, promptly eliminate the fixed station intercom continually in emission, receive between the phenomenon of " shake ".Its concrete operation principle is as follows: after the detected audio frequency of NE555 is higher than an amplitude, NE5555-#3 uprises, and---the Q09-C utmost point is drawn high, and---2P4M-K uprises, and---the D010 negative terminal uprises---the Q03-b utmost point uprises the full conducting of closing---, and the fixedly ptt switch and the emission of intercom are connected in relay K 01 adhesive, with reference to schematic diagram as can be known, when its 2P4M-K utmost point uprises, pass through Q13, Q12 also makes Q12-C utmost point output high level, add to the control utmost point that the Q11-b utmost point blocks 2P4M by D701 again, be level "0", because 2P4M this moment conducting, when losing triggering level, its control utmost point G also can keep conducting, till the delay high level of 2P4M anode A disappears, also step-down of 2P4M-K utmost point this moment, PTT control relay K01 also disconnects, promptly disconnect ptt switch, fixed station stops emission and promptly transfers accepting state to by emission state moment, at this moment for the VOX circuit and be subjected to fixing intercom because the superpower RF signal of emission suddenly disappears K01 given in the triggering of " the falsetto frequency " that brought a triggering level easilier, thereby cause K01 adhesive again, ptt switch is constantly beated and can not discharge, but at this moment because the effect of " twitter circuit disappears " does not have this problem, even 2P4M ends, the voltage of the 2P4M-K utmost point disappears, but because the effect of CS702 can make the voltage of the Q12-C utmost point have one to postpone and add to Q11-b extremely to go up, make its conducting, and the control utmost point of 2P4M is dragged down always and postpone a period of time by the Q11-C utmost point, and ringing pulse this moment is added to the 2P4M-A utmost point and also can not makes the 2P4M conducting, ptt switch can not move, after the delay, the control utmost point G of 2P4M has not been blocked but the transient voltage of the 2P4M-A utmost point disappears already, and this VOX circuit working circulation that can enter again next time that is to say because the existence of 2P4M core circuit has reached the effect of the elimination " shake " of PTT control relay (K01).

Be that the 2 pin sockets that the equipment of plugging into indicates LINE outside line printed words insert outside line by Fig. 1; Loudspeaker REV socket is with fixedly loudspeaker output or the socket of intercom are connected; And in the middle of fixedly intercom volume knob transfers to; The external power supply module inserts the 12V socket; The MIC socket is connected to the fixedly transmitter of intercom; Attention will be the C end like this with ground wire and signal hot junction; Correspond respectively to the normally-closed contact public pole normally opened contact that the MIC outside line of fixing machine and socket that the signal hot junction indicates the FGI printed words are respectively the PTT control relay; The two-wire system that is connected to fixing machine

Claims (1)

1, a kind of wire and wireless connector that allows intercom make a phone call, comprise electronic circuit, it is characterized in that outside line process busy relay difference accessing to audio coupling transformer and polar switching full-bridge, insert constant-current source, before ring detecting circuit is connected on busy relay; Ring detecting circuit is made up of triode Q01, Q02, optocoupler U51, one the tunnel through coupling capacitance C001, resistance R 001, the first level led positive pole of voltage stabilizing didoe DS001, diode D002 access optocoupler, the negative pole of optocoupler primary diode is inserted on another road respectively, with diode D001, the phototriode collector electrode of optocoupler connects power supply, and emitter connects secondary access electronic switching circuit; The collector electrode of the Q02 triode of electronic switching circuit divides two the tunnel, and one meets the P3.3 of single-chip microcomputer, the P2.7 mouth, and it two connects the D009 diode cathode, is linked into R008 resistance one end again, is delivered to the base stage of Q03 triode again by the R008 other end; Loud speaker meets double-tone coder and decoder ic MT8888 frequently, connect the C end of audio frequency coupling transformer by another road, the base stage of the #8 pin DTM double-tone of MT888 output access frequently double-audio signal amplifying triode 2N5551, the collector electrode of 2N5551, emitter are connected on anode and the negative terminal of constant current Heng Yuan respectively; Crystal oscillator inserts the 6th, 7 two pin of MT8888, MT8888 inserts the P0.0-P0.3 mouth line of single-chip microcomputer 89C51, single-chip microcomputer 89C51 inserts 12M reference clock crystal oscillator, the audio signal of outside line is sent into LM567 earlier and is amplified, the #8 pin of signal audio frequency detecting unit LM567 inserts the P2.6 mouth of single-chip microcomputer 89C51, and the level output pin P2.6 of single-chip microcomputer 89C51 inserts the base stage of Q511 triode; The non-earth terminal accessing to audio amplification circuit LM386 of the secondary winding of audio frequency coupling transformer, audio frequency amplification circuit LM386 output audio signal inserts acoustic control VOX testing circuit, acoustic control VOX testing circuit is made up of time-base circuit NE555 etc., the level of NE555-#3 pin is delivered to relay K 01 its adhesive of control, disconnection, control the intercom transmit-receive switch PTT of base again, thereby realized VOX acoustic control state, VOX acoustic control change-over circuit inserts anti-twitter circuit; Power subsystem, output+8V ,+5V ,+5V1 ,+12V, be respectively LM386, single-chip microcomputer 89C51, MT8888, LM567, relay K L20, relay K 01, LM324, NE555 power supply is provided; Form noise elimination triggering level SQL testing circuit by four-operational amplifier LM324, triode Q05, Q06, this testing circuit is exported high and low level, wherein one road level inserts the base stage of Q04 triode, the collector electrode of Q04 triode inserts the base stage of Q03 triode, the collector electrode of Q03 triode inserts an end of the work winding of PTT control relay, and the base stage of Q03 triode is inserted on another road through diode D011; The non-earth terminal of the secondary coil of audio frequency coupling transformer inserts transmitter socket JP04, is received three pin of transmit-receive switch PTT respectively by three contacts of K01 relay; The SQL testing circuit inserts the leading-in end of noise elimination triggering level.

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