CN2162053Y

CN2162053Y - Descriminator for telephone/facsimile printer

Info

Publication number: CN2162053Y
Application number: CN 93216300
Authority: CN
Inventors: 梁军; 刘金声
Original assignee: FEIHUA COMMUNICATION TECHNOLOGY DEVELOPMENT Co BEIJING
Current assignee: FEIHUA COMMUNICATION TECHNOLOGY DEVELOPMENT Co BEIJING
Priority date: 1993-06-15
Filing date: 1993-06-15
Publication date: 1994-04-13
Anticipated expiration: 2003-06-15

Abstract

The utility model relates to a telephone / facsimile automatic switching device, belonging to the technical field of wired facsimile communication. The utility model is composed of a casing, a power supply 1, a detection circuit 5, a switching circuit 6, ring-back circuit 7 and a control circuit which comprises a single chip computer 2, a latch 3 and a memory 4. The single chip computer 2 can identify accurately whether external wire calling signals are telephone or facsimile according to the output signals of the detection circuit 5, and the switching circuit 6 connects a corresponding load 19 to the external wire to ensure that a facsimile machine and a telephone don't interfere mutually when a circuit is shared. The utility model has the advantages of channel saving, reliable operation and user investment conversation.

Description

Descriminator for telephone/facsimile printer

The utility model relates to a kind of phone call/facsimile automatic switching device, belongs to the wirephoto communication technical field.

At present, China's local telephone network ability can't satisfy the demand of fax user fast development, and therefore most of users' facsimile machine and the shared telephone wire of phone have so just occurred because of fax and the phone interactional problem of correct decision automatically.CN2037870U discloses a kind of facsimile machine automatic power supply switch of being made up of input circuit and control circuit, and it utilizes the break-make of the bell signal control facsimile machine power supply of outside line, makes only ability energized when needs work of facsimile machine, thus but saves energy.But it does not solve facsimile machine and the interactional problem of phone, and the impulse current that frequent switch causes is easy to make facsimile machine to damage.

The purpose of this utility model is the problem that occurs at the shared circuit of facsimile machine and phone, and designs a kind of discriminator, and it can accurately discern the signal that outside line enters is fax or phone, and corresponding facsimile machine or telephone set is automatically connected with outside line.

In CCITT suggestion T30, the whole communication process of fax is divided into call setup and fax two parts, at call establishment stage, after dialling, the calling party during input, sends caller tone signal CNG to circuit, its frequency is 1100HZ, send out 0.5 second and stopped 3 seconds,, begin fax then up to the id signal CED that receives called tation.Telephone communication does not then have above-mentioned information.The utility model utilizes the caller facsimile machine to call out the CNG signal that sends and differentiates that each outside line incoming call is from fax or phone.

The purpose of this utility model realizes like this: a kind of phone call/facsimile discriminator is by shell, power supply and the control circuit be made up of single-chip microcomputer, latch, memory, and it also comprises testing circuit, commutation circuit and ring-back circuit.Wherein: the input of said testing circuit connects outside line and load, and output connects the P3 mouth of single-chip microcomputer, and it accounts for the sound detecting unit by ring detecting unit, phone off-hook detection unit, facsimile machine start detection unit and caller and forms; The input of said commutation circuit connects the P1 mouth of single-chip microcomputer, and it is made up of relay J 1～J5 and the driver that drives each relay, and it is from as selecting one to drop into outside line the phone of load, the facsimile machine or being connected on the corresponding detecting unit; Said ring-back circuit by input connect the driver of single-chip microcomputer P1 mouth and former edge joint outside line, the transformer TR2 that pays the output of edge joint driver forms, the 450HZ square wave backward signalling that it sends the P1 mouth of single-chip microcomputer is coupled in the outside line; Said power supply except that provide+5V and+the 12V direct current, also provide 60V to exchange the ringing-current source with the simulation ringing signal.

Discriminator makes facsimile machine and outside line break away from ordinary times, when outside line has ring, this signal is delivered in the single-chip microcomputer through the ring detecting unit and is differentiated: if the phone incoming call, then ringing-current source and telephone set are connected, simultaneously send backward signalling to outside line, single-chip microcomputer just is connected to phone in the outside line by commutation circuit by after plucking detecting unit and receiving off hook signal, treat conversation finish after with phone and outside line disengaging; If the fax incoming call is then connected ringing-current source and facsimile machine, single-chip microcomputer is connected to facsimile machine in the outside line after treating that the facsimile machine response starts, and after communication is finished, again facsimile machine and outside line is broken away from.

Below in conjunction with drawings and Examples the utility model is elaborated.

Fig. 1 is that circuit constitutes block diagram in the utility model;

Fig. 2 is power supply and a control circuit schematic diagram in the utility model;

Fig. 3 is a testing circuit schematic diagram in the utility model.

In the accompanying drawings: the unit 12-caller of 1-power supply 2-8031 single-chip microcomputer 3-74LS373 latch 4-2764 memory 5-testing circuit 6-commutation circuit 13～18-7406 driver 8-outside line 9-ring detecting unit 10-phone off-hook detection unit 19-load 11-facsimile machine start detection accounts for the sound detecting unit 27-741 amplifier 20～22-TLP521 type optical coupler 23～26-4589 reshaper 7-ring-back circuit J1～J5-midget relay TR1～anti-lightning strike overvoltage protection resistance R of TR2 transformer P-telephone set F-facsimile machine ZB-N-outside line bell signal PH-phone off hook signal PTF-phone and turns to facsimile signal FH-facsimile machine enabling signal FC-caller to account for that tone signal FDT-load connects outer line control signal WT-backward signalling SE-fault-signal RP-ringing-current and telephone set connection control signal FL-facsimile machine connects outer line control signal RF-ringing-current and facsimile machine connection control signal PL-phone connects outer line control signal

Phone call/facsimile discriminator shown in the figure is made up of shell (not drawing among the figure), power supply 1, control circuit, testing circuit 5, commutation circuit 6 and ring-back circuit 7.Wherein: control circuit is made up of single-chip microcomputer 2, latch 3 and memory 4; The input of testing circuit 5 connects outside line 8 and load 19, and output connects the P3 mouth of single-chip microcomputer 2, and it accounts for 12 4 detecting units of sound by ring 9, phone off-hook 10, facsimile machine startup 11 and caller and forms; The input of commutation circuit 6 connects the P1 mouth of single-chip microcomputer 2, and it is made up of relay J 1～J5 and the driver 13～17 that drives each relay, and it is from as selecting one to drop into outside line 8 phone of load 19, the facsimile machine or being connected on the corresponding detecting unit; Ring-back circuit 7 is connect the driver 18 of P1 mouth and the former edge joint outside line 8 of single-chip microcomputer 2 by input, the transformer TR2 that pays the output of edge joint driver 18 forms, and the 450HZ square wave backward signalling that it sends the P1 mouth of single-chip microcomputer 2 is coupled in the outside line 8; Power supply 1 except that provide+the 5V dc supply and+12V direct current relay power supply, also provide 60V to exchange the ringing-current source with the simulation ringing signal.

In ring detecting unit 9, the bell signal in the outside line 8 is through the input of capacitance-resistance series arm access optical coupler 20, and the output of optical coupler 20 is delivered to single-chip microcomputer 2 after reshaper 23 shapings; In phone off-hook detection unit 10, telephone set P is connected on the input of optical coupler 21, and the output of optical coupler 21 is sent single-chip microcomputer 2 after reshaper 24 shapings; In facsimile machine start detection unit 11, facsimile machine F is connected on the input of optical coupler 22, and the output of optical coupler 22 connects single-chip microcomputer 2 after reshaper 25 shapings; Account in the sound detecting unit 12 in caller, the former limit of transformer TR2 connects outside line 8 through the contact of relay J 1, after the signal of its reception is coupled to pair limit of transformer TR2, again through double limiting, be defeated by this amplifier as the comparative voltage of amplifier 27, the output of this amplifier is sent single-chip microcomputer 2 after voltage-stabiliser tube amplitude limit and reshaper 26 shapings.

In commutation circuit 6: the contact of relay J 1 is used for that outside line 8 and caller are accounted for sound detecting unit 12 and connects or connect with load (one of phone and facsimile machine); The contact of relay J 2 is used for control and whether phone P is connected to outside line 8; Whether the contact of relay J 3 is used to control the ringing-current source and joins with telephone set; Whether the contact control facsimile machine F of relay J 4 joins with outside line; Whether the contact of relay J 5 is used for control and ringing-current source and facsimile machine is connected.

The operation principle of following surface analysis discriminator.

When each relay discharges among the figure, its contact 4-6 and 13-11 closure; During each relay adhesive, its contact 4-8 and 13-9 closure.When line idle, except that relay J 2 is designed to the adhesive, all the other relays all discharge.When outside line has bell signal, this signal is sent in the single-chip microcomputer 2 after being converted to low level RN signal by ring detecting unit 9, single-chip microcomputer is sent the FDT signal immediately and is made relay J 1 adhesive, the contact 4-8 of J1 and 13-9 closure, bell signal in the outside line is sent into caller account in the sound detecting unit 12, the latter will detect gained signal FC and send in the single-chip microcomputer and differentiate.At this moment two kinds of situations are arranged:

The phone incoming call.Frequency and the CNG of FC are inconsistent, and it is the phone incoming call that single-chip microcomputer is declared current incoming call, and send the RP signal immediately and make the F3 adhesive, and its contact 4-8 and 9-13 closure are delivered to telephone set with the ringing-current source.Meanwhile single-chip microcomputer is sent 3 seconds the 450HZ square-wave signal WT in lasting 1 second interval and is given the calling party (also can send musical sound for the calling party through this loop) as ring-back through ring-back phone 7.Just now the RP signal of sending also is to make the J3 adhesive disconnect 3 seconds in 1 second, imitates the ringing tone of switch with this.During ring if any people's off-hook, then off hook signal PH is sent in off-hook detection unit 10, single-chip microcomputer receives that sending the PL signal behind this signal immediately discharges J2, its contact 4-6 and 11-13 closure, the FDT blackout of single-chip microcomputer meanwhile, J1 is discharged, just make phone be connected to the outside line conversation of getting on after the contact 4-6 of J1 and the 11-13 closure.The PH signal uprises behind the end of conversation, causes the PL blackout of single-chip microcomputer, makes J2 adhesive again, and discriminator is got back to idle condition.

If after the ring of stipulated number is sent, unmanned off-hook, then single-chip microcomputer is sent the RF signal and is made the J5 adhesive, and ring source and facsimile machine are joined, and changes fax when promptly nobody answers the call automatically.

The fax incoming call.Here again in two kinds of situation:

(1) calling party is an automated manner.The frequency of FC is consistent with CNG, and single-chip microcomputer is declared current incoming call for the fax incoming call, sends contact 4-8 and 9-13 closure that the RF signal makes J5 immediately, and facsimile machine is delivered in the ringing-current source.After the facsimile machine response starts, this enabling signal is detected and sends the FH signal by facsimile machine start detection unit 11, single-chip microcomputer is sent the FL signal after receiving this signal immediately, make relay J 4 adhesives, the contact 4-8 of J4 and 9-13 closure, meanwhile the FDT blackout of single-chip microcomputer discharges J1, so just facsimile machine is connected to outside line, and J4 discharged after communication was finished.

(2) calling party is a manual type.At this moment single-chip microcomputer detection is the same with phone incoming call process with handshaking procedure.Confirm that the other side will send a fax after just plucking phone, must click and be contained in the K switch that is used for producing the PTF signal on the shell, single-chip microcomputer sends a series of control commands after receiving the PTF signal like this, and operation J5 give the facsimile machine ring, and operation J4 and J1 make facsimile machine be forwarded to outside line.Its circuit operation is with identical described in (1).

In addition, each not adhesive of relay when discriminator does not power up, but because contact 4-6 and the 11-13 of J1 and J2 are closed, therefore do not influence and take on the telephone.When being out of order, just can use like this by facsimile machine.If single-chip microcomputer detects outside line or discriminator when fault is arranged, will send the SE fault-signal, handle by the malfunction indicator lamp indication that is contained on the shell.

By above narration as can be known, the utility model can guarantee on a circuit not only to use phone but also use facsimile machine and be independent of each other to have the advantage of saving channel and reliable operation, has also saved customer investment simultaneously; Owing to be provided with the hand switch that phone turns to facsimile signal, can realize that therefore both sides' call is communicated with after, take on the telephone earlier and send a fax again, not only saved the operating time but also saved the time resource of channel.

Claims

1, a kind of phone call/facsimile discriminator control circuit of shell, power supply (1) being arranged and forming by single-chip microcomputer (2), latch (3), memory (4), it is characterized in that it also comprises testing circuit (5), commutation circuit (6) and ring-back circuit (7), wherein: the input of said testing circuit (5) connects outside line (8) and load (19), output connects the P3 mouth of single-chip microcomputer (2), and it accounts for sound detecting unit (12) by ring detecting unit (9), phone off-hook detection unit (10), facsimile machine start detection unit (11) and caller and forms; The input of said commutation circuit (6) connects the P1 mouth of single-chip microcomputer (2), it is made up of relay J 1～J5 and driver (13)～(17) that drive each relay, and it is from as selecting one to drop into outside line (8) the phone of load (19), the facsimile machine or being connected on the corresponding detecting unit; Said ring-back circuit (7) is connect the driver (18) of P1 mouth and the former edge joint outside line (8) of single-chip microcomputer (2) by input, the transformer TR2 that pays the output of edge joint driver (18) forms, and the 450HZ square wave backward signalling that it sends the P1 mouth of single-chip microcomputer (2) is coupled in the outside line (8); Said power supply (1) except that provide+5V and+the 12V direct current, also provide 60V to exchange the ringing-current source with the simulation ringing signal.

2, phone call/facsimile discriminator according to claim 1, it is characterized in that: said ring detecting unit (9) is made up of optical coupler (20) and reshaper (23), outside line (8) connects the input of optical coupler (20) through the capacitance-resistance series arm, and the output of optical coupler (20) is delivered to single-chip microcomputer (2) through reshaper (23); Said phone off-hook detection unit (10) is made up of the answer the call optical coupler (21) of machine and the reshaper (24) that output connects single-chip microcomputer (2) of input, and optical coupler (21) and output connect the input of reshaper (24); Said facsimile machine start detection unit (11) connects the optical coupler (22) of facsimile machine by input and reshaper (25) that output connects single-chip microcomputer (2) is formed, and the output of optical coupler (22) connects the input of reshaper (25); Said caller accounts for sound detecting unit (12) to be made up of the reshaper (26) that the transformer TR2 of former edge joint outside line (8), input connect the output that amplifier (27) that transformer TR2 pays the limit and input connect amplifier (27), and the output of reshaper (26) connects single-chip microcomputer (2).

3, phone call/facsimile discriminator according to claim 1 is characterized in that in said commutation circuit (6): the contact of relay J 1 accounts for tone signal access caller with the caller in the outside line (8) and accounts for sound detecting unit (12) or load (19) is dropped into outside line (8); The contact control phone of relay J 2 is connected to outside line (8); The control ringing-current source, contact and the telephone set of relay J 3 join; The contact control facsimile machine of relay J 4 is connected to outside line (8); The control ringing-current source, contact and the facsimile machine of relay J 5 join.