CN1172516C

CN1172516C - Intelligent network communicator realized with common dual-tone telephone

Info

Publication number: CN1172516C
Application number: CNB031196098A
Authority: CN
Inventors: 徐忠义
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-17
Filing date: 2003-03-17
Publication date: 2004-10-20
Anticipated expiration: 2023-03-17
Also published as: CN1437385A

Abstract

The present invention relates to an intelligent interface device for realizing network communication by a common dual-tone telephone. The device comprises a telephone metropolitan network port, a direct current loop and a voice signal switching loop which are composed of external power source sockets, a two-line switching circuit and a four-line switching circuit which are highly isolated and mixed by MIC and SP signals, an MIC controlled automatic attenuation circuit, an SP automatic gain circuit, a switching and management platform composed of a single chip computer and memory EPROM software thereof, and a sound card socket and a serial (parallel) interface which are connected with a PC. The stochastic adjustment effect of MIC signal automatic attenuation and SP signal automatic gain is realized. Thereby, an application of two-tone network interface communication and high quality effect are realized.

Description

Realize the intelligent interface device of online communication with the common double voice frequency telephone

Technical field

The invention belongs to the special purpose interface device of realizing the voice messaging exchange on the net, particularly use the special equipment that the common double voice frequency telephone is realized the high-quality speech information exchange.

Background technology

Because the Internet does not have the notion of zone and country, its exchange of speech platform mainly relies on software program to carry out, and can be by gateway and local telephone network networking, so it is very low to dial the expense of international long distance call on the net.Conversation between the PC user in the local area network (LAN) (VLAN that comprises trans-regional or national boundaries) can be free fully.Although the PC IP address in the net is at random, but still can call out by the mode of looking into registration table is convenient.So call on the internet, be the new highlight of development communication technologies.Come from the angle that technology realizes, nothing more than being two kinds of methods: the first is without PC, with the special-purpose networking telephone, gateway, pass keep, stored-program control exchange forms system, realizes in the Internet, the connected network communication outside netting; It two is to utilize PC and sound multimedia thereof, by means of the speech exchange system in the exchange of speech platform of low charge on the Internet or the free local area network (LAN), realizes that PC is to PHONE, the PC communication to PC.From the application group, first kind of system be because cost height, investment are big, only is applicable to the big signal battalion carrier and trans-regional, the enterprise on national boundaries, business consortium.Second kind of system do not have anything to drop into for the user that PC is arranged, so it has huge customer group basically.Though the speech quality of second kind of system mainly relies on the software program on the dedicated web site voice platform to guarantee, the level match that connects between user side PC and earphone, the Mike's combination also directly influences communication effect.Because the sound card of PC and external earphone, microphone are the lower product of technology content, their input, output level require not strict, add on the PC and all can manually adjust, so the technical indicator of the sound card of different manufacturers production, ear microphone combination differs greatly earphone, Mike's Amplifier Gain.When being used for network phone system, be difficult to mate adjustment, the true cause of Here it is a lot of PC users feel network telephone call weak effect.

In addition, earphone, Mike's combination finish direct communication on the domestic networks make the ordinary people very uncomfortable outside, operational many inconvenient parts have also been increased, comprise the communication of keyboard dialing realization way online and far away ordinary city net phone etc., not only do not utilize in the common double voice frequency telephone very mature technique, and make that the user adopts online communication increase the many inconveniences of work easily simultaneously again.

Summary of the invention

Key Design thought of the present invention is that attempt is introduced online communication with the common double voice frequency telephone, the perfect functions design that not only will all utilize present dual tone phone and had, and can guarantee intelligentized the adjustment at random and the distinguishing and transmit of multiple signaling, make finish online connect after realization call out with communicating by letter with the common double voice frequency telephone and become possibility.

We know in the concrete design, when analog signal being carried out the A/D conversion, requirement to signal is the comparison strictness: the voice signal of distortion or amplitude limit can significantly improve to the A/D conversion back error rate, want to improve the speech quality of the networking telephone, if transmitter (English: SPEAKER, abbreviation SP.) signal gets too small can make you sound very effort.If the other side of the excessive conversation of transmitter signal can feel echo increasing.PC and earphone, microphone (English: MICROPHONE, abbreviation MIC.) earphone, the amplifier of microphone gain of the sound card mouth that joins of combination should transfer to optimum state, except that the professional, domestic consumer is difficult to accomplish this point.If we design a singlechip CPU is the conversion and control platform that core is barricaded as, when carrying out system's adjustment automatically, import certain voice-frequency signaling, after microphone amplifies, feed back to transmitter output (adjustment modes of the existing sound card of PC) again, this signal becomes binary signal through decoder and sends into single-chip microcomputer, determine its error rate by CPU, determine and remember the attenuation of its microphone output pad again by working software, can obtain the optimum Match of microphone signal level, till down circuitry.As for transmitter signal from sound card interface output, although the level adjustable extent is very big, but all belong to large-signal after all, can design a high performance automatic gain amplifier, no matter the output of transmitter signal is to be greatly little, the signal magnitude of transmission is constant after all can guaranteeing to start shooting, and this predefined signal amplitude can not cause any harmful effect to the widely different road of microphone.At this moment we insert common telephone set (double-tone frequently) and finish behind this device and being connected of PC, not only should use to make people feel very comfortable, custom (make up and compare) with ear, wheat, and its low price.The master-plan of the present circuit chip of common double voice frequency telephone is perfect and outstanding, and speech level has the standard criterion of international uniform, so its adaptability is strong, speech quality is controlled at one very within the category of standard easily.And the dtmf signal source standard of telephone set, make things convenient for the design standardization of adaptive circuit, singlechip CPU is that dtmf signal that conversion and control platform that core is barricaded as is easy to that dual tone phone is sent changes and becomes the discernible signaling of PC, and online dial-in direct is also become a reality.That is to say that the designed isolated plant of the present invention is an intelligent interface device of realizing online communication with the common double voice frequency telephone, it is one is the conversion and control platform that core is barricaded as by singlechip CPU, controlled microphone attenuator circuit with memory function, high-performance transmitter signal automatic gain circuit and two-way separate transmission microphone and transmitter signal, have high the isolation and two of mixed function, the isolated plant that four line voice signal change-over circuits are combined, it is that the management software of the conversion and control platform that is barricaded as of core cooperates and finishes the replacement ear with singlechip CPU, the wheat combination realizes the isolated plant of the online communication of high-quality, it promptly has the high-fidelity transmission characteristic that adapts with used telephone set after preliminary Installation and Debugging, and then the instrument of online communication just becomes reality.

Below in conjunction with given accompanying drawing, further specify structural principle of the present invention, and the objective of the invention is how to realize.

Description of drawings

Fig. 1 is theory diagram of the present invention and signal transmission structure figure.

Fig. 2 is the embodiment electrical schematic diagram that provides with regard to Fig. 1 design principle.

1 represents the common double audio telephone in the accompanying drawing, 2 represent local telephone, 3 represent the voice signal change-over circuit, and 4 represent voice signal DC loop two, four line change-over circuits, the controlled microphone attenuator circuit of 5 representatives, 6 represent transmitter signal automatic gain circuit, 7 representatives are the conversion and control platform that core is barricaded as with the singlechip CPU, and 7-A represents the dtmf signal amplifying circuit, and 7-B represents the dtmf signal decoder, 8 represent serial line interface (or parallel interface), J ₁Represent the telephone set socket, J ₂Represent the local network socket, J ₃Represent external 12 volts of outlets, J ₄Represent the multimedia sound card socket of PC, J ₅The plug receptacle of representing serial port to link to each other with PC mouthful, U ₁Be serial line interface 223 chips, U ₂Be 8 single-chip microcomputers, U ₃Be decoder, U ₄, U ₅Be four high guaily unit chip, U ₆Be watchdog chip, U ₇～U ₉This adaptive power supply chip, RX are represented a controlled attenuation device, W ₁, W ₂Be electric current device, M ₁Be field effect transistor.R is a resistance, and C is the electric capacity code, S ₁Represent single-pole single-throw switch (SPST), S ₂Be single-pole double-throw switch (SPDT), D ₁Be diode, D ₂Be Light-Emitting Diode, L ₁Represent ringing signal.

Embodiment

As shown in Figure 1, what provide is structure principle chart of the present invention, and this device links to each other with common dual tone phone 1 when using and (passes through S ₂), local telephone communication modes alternatively (passes through S ₂), also itself and device can be inserted the switching controlling platform 7 that single-chip microcomputer is formed by change-over circuit 3.The sound card output, the input port J that are connected with PC in addition in addition ₄With serial line interface J ₅Its structural circuit comprises following major part, the voice signal change-over circuit 3 that comprises common double voice frequency telephone 1, single-chip microcomputer is the conversion and control platform 7 that core is overlapped to form, two, four line change-over circuits 4 of speech sound signal DC loop, controlled microphone signal attenuator circuit 5 and transmitter signal automatic gain control circuit 6.By the voice signal that common double voice frequency telephone 1 is drawn, the process switch S ₁Two, the four line change-over circuits 4 that have microphone and isolation of transmitter signal high-performance and mixed characteristic are delivered in switching.The output of microphone signal after be divided into two-way after 5 decay of controlled microphone automatic attenuation circuit, wherein one the tunnel is connected to PC multimedia sound card interface microphone input port J from changing that circuit 4 is drawn _4-1, this road signal is sent out the online output that online realizes voice with digital signal after entering PC and handle with the high-fidelity performance.And to send into singlechip CPU be the conversion and control platform 7 that core is barricaded as on another road, this road mainly is to detect the dtmf signal that sends in the common double audio telephone, it is detected processing and amplifying become digital signal, form standard compliant online communication signal under the software administration in the single-chip microcomputer platform among the EPROM, thereby can realize using the common double voice frequency telephone on the net and realize online dialing, all kinds of communication operations such as recall.

From PC multimedia sound card interface J _4-2The transmitter signal of drawing is delivered to and is imported two, four lines into after automatic gain control circuit 6 is handled and pass the input that changes circuit 4 enters plain old telephone 1 through mixed processing voice signal line.

Change the shows signal of the caller address sign indicating number that contains again ringing signal that also having of conversion and control platform 7 that singlechip CPU is barricaded as introduce from local network and the ringing signal simultaneously over to, this signal converts standard signal to from the output of this platform under effective management of process software, transport to the resource that PC can make full use of PC through serial interface circuit 8 (also can take parallel knot mouthful) and will send a telegram here and come the code labeling in corresponding C RT zone.So that the user monitors the call information of local network in conversation, even can two common double audio telephones of direct join, so just can a line two-shipper, reach more complete function.

As can be seen, the two language tone signal change-over circuits 3 of the common double audio frequency among the present invention mainly are existing phone interface J from given embodiment electrical schematic diagram ₁, local telephone socket J ₂With external dc constant voltage source socket J ₃Wherein establish the change over switch S of a dpdt double-pole double-throw (DPDT) ₂If adopt the two-shipper circuit then S ₂Can not use fully.J wherein _3-3The input pin that pin is connected to the PC serial line interface directly is used for detecting ringing-current and compound caller identification sign indicating number.

Voice signal from network and the key Design of the transmitted in both directions between the telephone set be one microphone signal and transmitter signal high-performance mixed and two, the four line change-over circuits 4 of isolating, thereby realize that the double-directional speech signal from the phone to the network interface passes mutually.Microphone signal with telephone set enters the dtmf signal instruction that also having of two, four line change-over circuits 4 sent by telephone set, it is also imported from the microphone signal of this circuit, but being directed to by singlechip CPU is the input port of the conversion and control platform 7 that is barricaded as of core, and then this is held to singlechip chip U ₂Input pin between also be provided with the amplifying circuit (7-A) of a dtmf signal and the series circuit of dtmf signal analog to digital conversion circuit A/D (7-B), enter the serial line interface 8 that is forwarded to PC under the command and management of single-chip microcomputer software in EDROM after treatment with the digital code form then.

For the adaptability of finishing between this device and the subscriber phone is debugged the present invention has inserted a single-pole single-throw(SPST at DTMF amplifying circuit 7-A front end change over switch S ₁, the microphone signal output pin of a termination two, the four line change-over circuits 4 of switch, the other end is received the signal input port of transmitter signal automatic gain circuit 6.During debugging with S ₁Go to the transmitter signal end.At this moment import a dtmf signal, it is the conversion and control platform that core is barricaded as that the passage of this signal meeting footpath microphone can enter singlechip CPU by amplifier (7-A), decoder (7-B), under software administration, finish judgement to its error rate, set the control end of corresponding digital code command according to the error rate again to the controlled attenuation circuit 5 of microphone, thereby determine the attenuation decibel value of microphone attenuator circuit, and form memory.Given so just one of square frame 5 has memory function, the automatic attenuation circuit that is controlled by the instruction that single-chip microcomputer conversion and control platform 7 sends can be realized changing its attenuation decibel value with instruction, guarantee that the microphone signal of telephone set realizes best matching state behind the sound card mouth of PC, till this circuit is closed.So, work as S ₁Finish the pre-postpone of debugging, with S ₁Return to state shown in Figure 1, can realize that promptly desirable such realization adjusted to the intelligent at random of PC by microphone among the present invention.

From accompanying drawing 1, it can also be seen that one from local telephone plug J _2-3The holding wire that pin is directly drawn is the signal that is used for detecting ringing-current, in the ringing signal transmission course, can get the address code signal of incompatible electricity, this signal can be through being converted to digital signal from double-tone when plain old telephone is drawn frequently, that is to say ringing signal through ringing-current handle with testing circuit after what enter platform can be standard digital signals, here just no longer chatting, it is from J more _2-3In draw, the serial pin that enters singlechip CPU platform 7 inserts and gets final product.

From the embodiment electrical schematic diagram that accompanying drawing 2 provides, can be expressly understood design philosophy of the present invention, and be how to realize the online communication of common double voice frequency telephone with this device.

The voice signal change-over circuit 3 of common double voice frequency telephone is that the change over switch S2 by dpdt double-pole double-throw (DPDT) is a commutation circuit of core, and it comprises and switch S ₂The interface J of the common double voice frequency telephone that links to each other ₁, city net words socket J ₂, DC voltage-stabilizing socket J ₃Commutation circuit, ringing signal is from local network pin J _2-3Draw on the signal input pin outside ringing-current identification and change-over circuit are delivered to the conversion and control platform 7 that singlechip CPU forms.S ₂State such as Fig. 2 during application also can be at J ₃And go up an other phone and form the two-shipper logotype.

Being the conversion and control platform 7 that core is barricaded as by singlechip CPU in the present embodiment, is to have adopted 8 single-chip microcomputer U ₆, with and peripheral capacitance resistance ware C ₁～C ₆, C ₈, C ₉, R ₆, crystal oscillator Y ₂Constituted the workbench of single-chip microcomputer, can be at single-chip microcomputer U ₂EPROM in write corresponding hypervisor (also can program be made the ROM peripheral hardware of single-chip microcomputer) by manufacturer.The supporting serial line interface U that is provided with ₁8 and for guaranteeing the more watchdog chip U of good berth of management software ₃The signal L that collects through the local telephone network netting twine ₁After the ringing-current identification circuit was handled, phone voice signal that microphone spreads out of and the dtmf signal that includes were through DTMF amplifying circuit U _5DAfter the amplification again through U ₃Decoding is sent into after the platform processes that CPU forms again through U ₂Output pin (P _1.7, P _3.7), the decibel value of control attenuator circuit, other digital signal is sent into PC through serial port U, realizes the concrete functions such as demonstration of online dialing and incoming call.

Having high the isolation and the two-way voice transmissions two of mixed performance, the key Design content that wire/four-wire converting circuit 6 is this electric control gear, is by four high guaily unit U4 in an embodiment of the present invention _(A-D)And U _5-A, and foreign components and parts R ₃～R ₅, R ₁₀, R ₁₂, R ₁₇, C ₁₇, C ₁₈, C ₂₀And adjusting variable resistor W ₁, W ₂The two-way voice transmissions passage that constitutes.The voice signal that is sent by microphone is through capacitor C ₁₀, resistance 3, W ₁Be coupled into two, four change-over circuits, the microphone voice signal is from U _5DControlled microphone signal attenuator (RX) is sent in pin 1 output, decay back signal through J _3-3The sound card of pin input PC, the input PC also sends from network.

Attenuator RX is a controlled microphone signal attenuator circuit, and wherein control command is from U ₂R1.7 pin and 3.7 pin, its command signal can form 00,01, the sign indicating number of 10,11 four grades, with the decibels of control attenuator circuit adjustment decay, concrete attenuator circuit is that custom circuit is no longer specifically given an example at this.Microphone signal is U from two, four line change-over circuits, 4 microphone signal outputs among the embodiment _5AOutput cause the pin of attenuator RX, the commands for controlling that sent by conversion and control platform 7 is carried out microphone signal after the attenuation processing again through capacitor C ₁₉Coupling input PC sound card plug J ₄Tripod, send into PC and handle.Certainly can be made as the more grades of three-way setting to realize more accurate control according to the design controlled signal.Belong to circuit common general knowledge as for concrete controlled attenuation circuit and no longer itemized electrical schematic diagram.

The auto-gain circuit 4 of transmitter signal is by the U in the four high guaily unit _5-B, U _5-CAnd tube effect pipe M ₁, and peripheral components C ₂₀, C ₂₂, R ₂₂～R ₂₉, R ₁₉The negative feedback two-stage audio frequency auto-gain circuit of forming, the transmitter signal is sound card plug J in PC ₄The 1st pin draw and cause U again _5BThe 5th pin input, after adjusting automatically through negative feedback secondary gain amplifier again by U _5BOutput 7 pin export the transmitter signal input part of two, four line change-over circuits to.

U in the circuit that embodiment provides ₇, U ₈, U ₉For supporting power supply chip to guarantee the normal operation needs of whole circuit.

By the made device of above structural design, only need with PC in link to each other with the plug of sound card, link to each other with a serial port or parallel port, again by loading onto common dual tone phone, after local telephone network netting twine and the doubling of 12 volts of standard DC source.Open PC, adjust the coupling of sound card and phone, just can enter automatic adjusted self adaptation state, thereby easily enter the overall process that realizes online communication with plain old telephone, comprise online dialing with the standard DTMF signal.Its call tone quality is good, distortion is little, adaptability can be used to by force match with the sound card phone of each producer, adjust also very simple, the online speech quality that helps forming commercialization and improve the ordinary PC user, reduce consumption, help large scale application, in networking telephone development, have the certain significance.

Claims

1, a kind of intelligent interface device of realizing online communication with the common double voice frequency telephone, this device and common double audio telephone (1) during application, local telephone (2), sound card output, input port (J4) and serial port connector (J5) or the parallel port of PC link to each other, and it is characterized in that comprising in this " device " following each several part circuit:

A, voice signal change-over circuit (3),

B, be the conversion and control platform (7) that core is barricaded as by singlechip CPU,

Two, the four line change-over circuits (4) on c, the widely different road of speech sound signal direct current,

D, controlled microphone signal attenuator circuit (5),

E, transmitter signal automatic gain control circuit (6),

The voice signal of being drawn by common double audio telephone (1) is through single-pole single-throw(SPST change over switch (S ₁) after send into two, four line change-over circuits (4) of microphone and transmitter Signal Spacing and mixed characteristic, the output of microphone signal is drawn after controlled microphone signal attenuator (5) decay from this change-over circuit (4) and is divided into two-way, and one the tunnel is connected to PC multimedia sound card interface (J ₄) the microphone input, it is the conversion and control platform (7) that core is barricaded as that another road is sent into by singlechip CPU, from interface (J ₄) draw the transmitter signal and deliver to the transmitter signal and increase automatically and cover the input that enters two, four line change-over circuits (4) after circuit (6) is handled, after mixed processing, enter the widely different road of voice signal of ordinary audio telephone set again, import singlechip CPU simultaneously into and be and convert the microphone signal attenuation instructions after conversion and control platform (7) that core is barricaded as is handled to and transport to attenuator circuit (5) or convert to and dial the number and the caller identification signal is transported to PC through serial interface circuit (8) or parallel interface.

2, according to the said intelligent interface device of realizing online communication with the common double voice frequency telephone of claim 1, it is characterized in that being provided with by the amplifying circuit (7-A) of a dtmf signal and the sequential circuit of an analog to digital conversion circuit (7-B) between the input port of the conversion and control platform (7) that microphone signal output to the singlechip CPU at two, four line change-over circuits (4) is barricaded as.

3, realize the intelligent interface device of online communication according to claim 2 is said with common double audio frequency phone, it is characterized in that connecting a debugging with hilted broadsword, singly throw change over switch (S at DTMF amplifying circuit (7-A) front end ₁), switch one termination two, four line change-over circuit (4) microphone signal outputs, the other end is connected to the input port of transmitter signal automatic gain circuit (6).

4, realize the intelligent interface device of online communication it is characterized in that ringing-current detection signal (L with the common double voice frequency telephone according to claim 1 is said ₁) be from local network interface (J ₂) on ringing-current output (J _2-3) go up on the serial port position of directly introducing conversion and control platform (7).

5, according to claim 1 said with between common double frequently phone realize the intelligent interface device of online communication it is characterized in that voice signal change-over circuit (3) is by double-point double-throw switch (S ₂), coupled plain old telephone plug receptacle (J ₁), local network plug receptacle (J ₂), 12 volts of DC power supply socket (J ₃) change-over circuit that connects into, ringing signal (L ₁) from local network socket (J _2-3) draw on the pin behind ringing-current identification and change-over circuit, cause on the signal input pin of the conversion and control platform (7) that singlechip CPU is barricaded as.

6, realize the intelligent interface device of online communication it is characterized in that singlechip CPU is that the conversion and control platform (7) that core is barricaded as is by one 8 single-chip microcomputers (U6) and peripheral components (C with the common double voice frequency telephone according to claim 1 is said ₈, C ₉, R6), crystal oscillator (Y ₂), serial line interface (U ₁) and peripheral components (C ₁-C ₅), supporting decoder (U ₃), dtmf signal amplifying circuit (U _5D) form, from the dtmf signal of microphone signal line from switch (S ₁) introducing signal amplification circuit (U _5D) input pin, send into CPU through decoder again, the signal after handling under the corresponding management software control in the EPROM of CPU is through serial line interface (U ₇) send into PC.

7, realize the intelligent interface device of online communication it is characterized in that two, four line change-over circuits (4) are by amplifier (U with the common double voice frequency telephone according to claim 1 is said ₄, U _5A) and peripheral components (R ₃～R ₅, R ₁₂～R ₁₇, C ₁₇, C ₁₈, C ₂₀) and regulate resistance (W ₁, W ₂) the double-directional speech signal transmission passage that constitutes.

8, according to the said intelligent interface device of realizing online communication with the common double voice frequency telephone of claim 1, it is characterized in that controlled microphone attenuator circuit (5) is the attenuator (RX) of a controlled variable attenuation multiple, from the microphone signal of telephone set output (U from two, four line change-over circuits _5A) causing first pin of attenuator (RX), the microphone signal after the decay is introduced PC through input (tripod) and is handled, and the controlled end of attenuator (2,4) pin is received the signaling output pin (U of CPU platform _2～1.7, U _2～3.7).

9, realize the intelligent interface device of online communication according to the said common double voice frequency telephone of claim 1, it is characterized in that transmitter signal automatic gain circuit (6) is by amplifier (U _5B, U _5C) and field effect transistor (M ₁) and peripheral components (C ₂₀, C ₂₂, R ₂₂～R ₂₇, R ₁₉) the negative feedback two-stage audio frequency auto-gain circuit formed, the transmitter signal is from sound card socket (J ₄) the 1st pin lead to amplifier (U _5B) input of the 5th pin, after two-stage is amplified the Gain Automatic adjustment of negative feedback, by amplifier (U _5B) output output to the transmitter signal input port of two, four line change-over circuits (4).