CN201048394Y - Single-key dialing communicator - Google Patents

Abstract

The utility model discloses a single key dialing communicator, which includes a dialing communicating circuit, a control circuit, and an audio frequency amplifying circuit. The control circuit adopts an AT89C2051 type singlechip; the audio frequency amplifying circuit adopts a TDA2822 type singlechip; the P1 port of the singlechip AT89C2051 is connected with a dialer through an insulating resistor. The dialing communicating circuit is connected with the TDA2822 through an input matching network and then is connected with a loudspeaker, a mike is connected with the dialing communicating circuit through the TDA2822 and a mike sensitivity adjusting circuit. The AT89C2051 is connected to the ground through a light touch switch; the AT89C2051 is connected with a relay and the drive circuit thereof, the relay and the drive circuit thereof are connected with a signal mixing circuit; the telephone lines are connected with a polarity switching circuit before being connected to the dialing communicating circuit. The utility model can finish all operations and direct communication with a single key, the cost is low.

Description

The one touch dialing communication

Technical field

The utility model relates to communication technique field, especially a kind of communications user terminal equipment.

Background technology

At present, ordinary telephone set is made of keyboard, microphone, receiver and internal circuit, must pick up a receiver during use or by the Hands-free key calling that redials.This just requires the user must know callee's telephone number, and operates comparatively loaded down with trivial details.Under the situation of some special emergency and danger, the user may forget these numbers, and perhaps field condition does not allow the user to dial one group of complete number.In addition, in places such as school, hotel, hospitals, need inter-sectional the conversation, only use the dialing of units code name to get final product, common dial telephone waste resource is installed, cost is too high.Though use the wireline call device can overcome above defective, poor reliability, the transmission range of this calling system are near.The telephone set that has occurred band binding number in recent years, this class phone all is to install the control device that is used for the one touch dialing operation in the microprocessor control circuit of existing telephone additional, one sets of numbers is bundled on a certain singly-bound by the user by the regulation flow process during work, this class telephony feature is powerful comprehensively, but still do not break away from the structure of ordinary telephone set, complex structure, cost is too high.

Summary of the invention

In order to overcome the prior art complex structure, the defective that cost is too high, the utility model provides a kind of one touch dialing communication, it not only resembles the wireline call device simple in structure, can call out easily, and can resemble and have higher reliability and transmission range far away the ordinary telephone set, cost is also low.

The technical scheme that its technical problem that solves the utility model adopts is: the utility model comprises number dialing telephone call circuit, control circuit and audio amplifier circuit.The number dialing telephone call circuit adopts the circuit in the microtelephone of existing technology maturation, contains the Dual Tone Multifrequency dialer of being with keyboard, audio frequency amplifier, circuit for answering, voltage stabilizing circuit and the dtmf signal of tube and the signal mixed circuit of audio signal are answered in microphone amplifier, the output that input connects Electret condenser microphone.Any programming device or digital circuit can be adopted in the core of control circuit, as single-chip microcomputer, programming device CPLD etc., and the utility model employing cost performance height, the AT89C2051 type single-chip microcomputer that volume is little.Audio amplifier circuit is divided into audio frequency again and continues and amplify and two parts of the preposition amplification of microphone, can adopt the universal audio amplification circuit, the utility model employing TDA2822 type single-chip microcomputer, its inside contain two independent amplifiers and defencive function perfect.The P1 mouth of single chip computer AT 89C2051 connects the dialer of number dialing telephone call circuit by the isolation resistance data wire that is connected; Audio frequency continues to amplify and is finished by audio frequency amplifier 1 in the TDA2822 sheet, the output of its input termination input matching network, input matching network is made of 3 resistance, the two ends of input matching network respectively and connect 1 resistance between the ground wire, by 1 resistance this two ends bridge joint is got up again, the output that the input termination number dialing telephone call circuit sound intermediate frequency of input matching network is amplified, the input of input matching network is less to that resistance of ground wire, amplify the dummy load of output as number dialing telephone call circuit sound intermediate frequency, the resistance of bridge joint and output are used for decay to audio signal to that resistance of ground wire between two ends.Audio frequency continues, and to amplify be that audio frequency amplifier 1 output connects loud speaker in the TDA2822 sheet.The preposition amplification of microphone is finished by audio frequency amplifier 2 in the TDA2822 sheet, its output signal connects the microphone sensitivity regulating circuit, promptly behind a resistance, divide two-way, one the tunnel connects the input that number dialing telephone call circuit microphone amplifies, connect an adjustable resistance between another road and the ground wire and be used to regulate microphone pickup sensitivity, the preposition amplification of microphone is the input of audio frequency amplifier 2 tube of answering in the TDA2822 sheet; The P3.2 mouth of AT89C2051 connects an end of touch-switch, the other end ground connection of touch-switch; Must connect the resistance that resistance is less between the positive pole of AT89C2051 and the positive source, be used to improve the internal resistance of power supply, AT89C2051 can reliably be dialled, the resistance that the P3.3 mouth of AT89C2051 connects a big resistance is used for driving relay to positive source and triode, relay and drive circuit thereof connect signal mixed circuit, are used to control off-hook and on-hook; Article two, telephone wire connected polarity transformation circuits before the access dial speaking circuit, wherein the normally opened contact of a palpus serial connection relay; Prevent that power supply from connecing and inverse time damage internal circuit connecing diode of 12V power supply place series connection.

The resistance that connects a little resistance between audio frequency amplifier 1 and the loud speaker makes the sound size to fit of loud speaker be unlikely to again to produce self-excitation with microphone as power attenuation.

Automatic control circuit and audio amplifier circuit are powered by external 12V power supply, can improve reliability and be easy to control.

After touch-switch is pressed, the P3.2 mouth of single chip computer AT 89C2051 is changed to low level, program responds, AT89C2051 begins to carry out dial-up program, earlier the P3.3 mouth is put high level and make the relay normally open contact adhesive make the number dialing telephone call circuit get electric and off-hook, then from P1 mouth output dial data.The other side behind the FD finished dialing during this, needs on-hook then to press touch-switch once more in case connection can be conversed, in a single day AT89C2051 detects the P3.2 mouth and recovers high level, be that AT89C2051 made P3.3 that mouth is put low level after touch-switch discharged, relay normally open contact disconnected realize on-hook.

The beneficial effects of the utility model are, can singly-bound finish whole operations and can directly converse, adopt existing babyphone machine circuit can significantly reduce cost as the number dialing telephone call circuit, relay belongs to mechanical switch, can effectively prevent thunderbolt, microphone pickup sensitivity can be regulated according to actual communication effect.

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

Description of drawings

Fig. 1 is the utility model functional-block diagram.

Fig. 2 is the utility model circuit diagram.

Fig. 3 is a kind of microtelephone dialing keyboard schematic diagram.

Among the figure, RW represents semifixed resistor, and J represents relay, and V represents triode, and A0-A7 is the keyboard data line.

Embodiment

As shown in Figure 1, the utility model comprises single-chip microcomputer, relay, audio frequency amplifier three big parts.

As shown in Figure 2, the number dialing telephone call circuit of frame of broken lines part is an available circuit.The 12V supply voltage obtains the 11.3V supply voltage through a protection diode D6 earlier, and then obtains the 5V supply voltage through a 5V pressurizer.The P1 mouth of single chip computer AT 89C2051 connects number dialing telephone call circuit keyboard data line respectively by the isolation resistance R1-R8 of 8 3.3K Ω, meet a touch-switch AN between P3.2 mouth and the ground wire, the wiring of P3.3 mouth divides two-way, one the tunnel and the 5V power supply between connect 4.7K Ω resistance R 15, it is that 2SC9013 drives triode V base stage that another road connects model by 1K Ω resistance R 16.The anodal VCC of single chip computer AT 89C2051 divides two-way, the one tunnel with the 5V power supply between be connected in series one 100 Ω resistance R 14, another road meets the filter capacitor C of 0.1 μ F.The coil windings of relay J is connected with one 100 Ω resistance R 17, is sustained diode 1 parallel connection of 1N4004 with this branch road and model then, they is received between the collector electrode of 11.3V power supply and triode V at last.Minus earth line behind the rectification full-bridge D2-D5 that the diode that telephone wire is IN4004 through 4 models is formed, the positive pole of positive pole access dial speaking circuit behind the normally opened contact of 6V relay J.The input of audio frequency amplifier 1 connects the right-hand member of input matching network in the audio frequency amplifier TDA2822 sheet, input matching network is made of 3 resistance, the two ends of input matching network respectively and connect 1 resistance R 9 between the ground wire, R11, by 1 150 Ω resistance R 10 this two ends bridge joint is got up again, left end connects the output that number dialing telephone call circuit sound intermediate frequency is amplified, connect 51 Ω resistance R 9 between left end and the ground wire, connect 120 Ω resistance R 11 between right-hand member and the ground wire, impedance be the loud speaker Y of 8 Ω be connected on audio frequency amplifier TDA2822 after one 20 Ω resistance R 13 is connected in the output and ground wire of amplifier 1 between; Audio frequency amplifier 2 output signals are divided two-way in the TDA2822 sheet after a 100K Ω resistance R 12, one the tunnel connects the input that number dialing telephone call circuit microphone amplifies, meet the semifixed resistor RW of a 20K Ω between another road and the ground wire, the input of audio frequency amplifier 2 connects Electret condenser microphone in the TDA2822 sheet.

As shown in Figure 2, behind the power connection, single chip computer AT 89C2051 resets, P3.3 mouth output low level, triode V ends, and the coil windings no current of relay J passes through, the normally opened contact of relay J disconnects, so the positive pole of number dialing telephone call circuit is disconnected, the number dialing telephone call circuit is not worked.After touch-switch AN is pressed, the P3.3 mouth output high level of single chip computer AT 89C2051, triode V conducting under the acting in conjunction of pull-up resistor R15, the coil windings of relay J has electric current to pass through, the normally opened contact switch adhesive of relay J, the positive pole of number dialing telephone call circuit and telephone wire are connected, and number dialing telephone call circuit off-hook is waited for dialing.The P1 mouth of single chip computer AT 89C2051 is exported dial data successively then, dials each number and continues 100MS, and per two dial pauses stop the 100MS that dials.Wait the other side off-hook can be conversed after dialing was finished, press the then P3.3 mouth output low level of single chip computer AT 89C2051 of touch-switch AN during this once more, triode V ends, and the positive pole of number dialing telephone call circuit is disconnected and on-hook again, and single chip computer AT 89C2051 gets back to holding state.As shown in Figure 3, dial which number and the keyboard data line of correspondence can be put low level, for example dial " 5 " number key and A4, A6 can be put low level, other 6 data wires are in free state, so P1 mouth output control word #10101111B just can transfer to number " 5 ".

When assembling is with required electronic devices and components one by one correspondence be welded on the printed circuit board (PCB), loud speaker, microphone are fixed on the panel, pay special attention to and with PUR the back of the body end of microphone and the back side of panel to be shut fully, prevent that the back of the body end of microphone and the sound wave that send at the loud speaker back side from producing self-excitation, with lead its contact is drawn then to be welded on the circuit board.Only need during debugging under the situation of off-hook, to regulate semifixed resistor RW, till soon producing self-excitation howling and don't self-excitation, make microphone pickup sensitivity maximum with small screw driver.

Claims (2)

1. one touch dialing communication, comprise number dialing telephone call circuit, control circuit and audio amplifier circuit, the number dialing telephone call circuit comprises that the DTMF pulsing device of being with keyboard, input connect audio frequency amplifier, circuit for answering, voltage stabilizing circuit and touch-tone signal and the signal mixed circuit of audio signal that the microphone amplifier of Electret condenser microphone, output are answered tube, is characterized in that: control circuit employing AT89C2051 type single-chip microcomputer; Audio amplifier circuit adopts TDA2822 type single-chip microcomputer, wherein contains two independent amplifiers; The P1 mouth of single chip computer AT 89C2051 connects dialer by isolation resistance; The output that number dialing telephone call circuit sound intermediate frequency is amplified is by the input of audio frequency amplifier 1 in the input matching network connection TDA2822 sheet, and the output of audio frequency amplifier 1 connects loud speaker in the sheet; The input of audio frequency amplifier 2 tube of answering in the TDA2822 sheet, output connects the input that number dialing telephone call circuit microphone amplifies by the microphone sensitivity regulating circuit; The P3.2 mouth of AT89C2051 connects an end of touch-switch, the other end ground connection of touch-switch; The P3.3 mouth of AT89C2051 is succeeded electrical equipment and drive circuit thereof, and relay and drive circuit thereof connect signal mixed circuit; Article two, telephone wire connected polarity transformation circuits before the access dial speaking circuit.

2. according to a kind of one touch dialing communication of claim 1, it is characterized in that: the input of described microphone sensitivity regulating circuit divides two-way behind a resistance, one the tunnel connects the input that number dialing telephone call circuit microphone amplifies, and connects an adjustable resistance between another road and the ground wire.

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