CN2290154Y - Microcomputer telephone detecting instrument - Google Patents

Abstract

The utility model provides a microcomputer telephone detecting instrument, which is mainly composed of a single-chip microcomputer, a D/A transducer, a bipolar operational amplifier, an analog switch, an audio amplifier, a ringing step-up transformer, a monostable trigger, a double-audio receiver, an LED display, a DC output circuit, an isolating control circuit, etc. The microcomputer telephone detecting instrument has the characteristics of accurate signal output, convenient carrying, cheap price, convenient operation, etc. The utility model can be used for detecting various functions of wire telephones for users repairing, selling, producing telephones, etc., and for developing the terminal equipment of telephone networks.

Description

The microcomputer telephone set detector

The utility model is used to detect the various functions of wire telephone, is specially adapted to carry out at any time in the maintenance, sale, production process of telephone set the exploitation of Function detection and telephone network terminal equipment.

The method of telephone functionality detection at present mainly contains:

Phone is inserted the phone network on-line testing, and its shortcoming is to take telephone line, and the two places conversation is wasted time and energy.

The special detector that adopts the phone production line to be equipped with, advantage is also can test some parameter of telephone set except that functional test, also can send signal (as ringing frequency, output current) to some in test is provided with, but this kind equipment costs an arm and a leg, can not be portable, and parameter testing is not that the user is needed, is equipped with this kind equipment and can causes waste undoubtedly.

Adopt easy telephone testing instrument.This quasi-instrument finding kind is more, and cheap, but all has tangible deficiency: lack of standardization as output signal; Function is complete inadequately; Intimate borrowing switch or relay are exported switching, can not realize whole contactlessizationes, and useful life is short; Can not demonstrate the overall process that both sides call out mutually automatically.Above-mentioned drawbacks limit the use of this quasi-instrument because they can not send the signal meet GB as analog switch, can not simulate the workflow of board, thereby limit its scope of application.

This instrument is core with the single chip microcomputer, can finish the detection of the following function of telephone set under its control:

The phone ring detects---and instrument sends 25HZ, 75V to phone, send 4 seconds disconnected bell signals in 1 second.

Transmitter detects---and the voice that instrument comes phone are amplified to loud speaker through amplifier and amplify.

Receiver detects---and the microphone in the instrument is sent to the phone receiver with voice.

Switch hook detects---and instrument detecting is carried behind the machine as if blocking ring to phone, illustrates that switch is normal.

Dial feature detects---and comprise pulsed phone and dual tone phone, the LED on the instrument shows the phone dialed number in real time.

The phone hand-free function detects---and press hands-free switch and should have the effect identical with the machine of putting forward.

The phone redialing function detects---on instrument LED, should show and the identical serial number that last time dialled by redial key.

Outer power distributing meter can carry out the receipts bell characteristic of phone and the detection of dc parameter.

Accompanying drawing 1 has provided electrical schematic diagram of the present utility model.The chief component of this instrument is by the single chip microcomputer [1] of ROM in the band, and D/A converter [2], bipolarity amplifier [3], analog switch [4], audio frequency amplifier [5], ring step-up transformer [6], monostable trigger [7], double-tone recipient [8], light-emitting diode display [9] and dc output circuit frequently (comprise D, W ₁, W ₂, T ₁), isolation control circuit (comprises F ₁, F ₂, H and T ₂) form.

The course of work and the key problem in technology of this detector are as follows:

The ring generative circuit of detector is made of analog switch and booster circuit.Tested phone is met detector output V, N, after instrument powers on and automatically resets, by " ring " key, single-chip microcomputer [1] is value and export bus B to from additional straight flow component table of natural sines regularly, through D/A converter, the two-way amplifier output half-sinusoid voltage I to analog switch [4] ₁, I ₂Input, the control end C of analog switch [4] ₁, C ₂Be subjected to the output P of single-chip microcomputer [1] ₁P ₂Control, P ₁P ₂Frequency with 25HZ is alternately exported O, through F ₁, F ₂Anti-phase back C ₁, C ₂Alternately export 1, make circuit output end O ₁, O ₂Alternately export the half-wave sinusoidal voltage to step-up transformer two former limits, boosting through transformer [6] exports V, N end to.

In view of ring is an ac high-voltage, the isolation technology of ring output of the present utility model is by reverser F ₁, F ₂NOR gate H and triode T ₂Constitute.Its operation principle is: generally, and single-chip microcomputer delivery outlet P ₁P ₂=1, this moment, door H was output as 1, T ₂Conducting, output N is current potential closely, V end output dc voltage 48V.When sending ring, triode T ₂Be subjected to single-chip microcomputer P ₁, P ₂Mouthful control, when or a door H when being output as O, triode T ₂End output and systematically isolation.While F ₁, F ₂The passage I of output control analog switch [4] ₁-O ₁And I ₂-O ₂Conducting by turns makes instrument realize high pressure ring output.

Telephone set receive bell signal (this moment instrument LED in 1 second and 4 seconds Alternation Display L and-) if loud, illustrate that the phone ring has fault.Phone is carried machine, and ring should be blocked, if ring does not stop, illustrates that the breeches pipe switch has fault.After phone is carried machine, enter talking state.Instrument is passage l by microphone M, analog switch [4] to the words of sending of phone ₄O ₄And audio frequency amplifier [5], through coupling capacitance C ₁Deliver to the triode T that works in emitter-base bandgap grading output ₁Base stage is after T ₁Export the V end to.Telephone set to instrument send words by V end input after amplifier whether, can detect the transmitter and the receiver work of phone in communication process to loud speaker normal.

Above process is the calling procedure of instrument to phone.Telephone set is in the calling procedure of detector, and the operation principle of instrument is as follows:

After detector resetted, phone was carried machine, because of V, N voltage drop to about 10V, and voltage-stabiliser tube W ₃End P ₅Uprise level, single-chip microcomputer detects phone in view of the above and carries machine, immediately to the other side's Sending dialled number sound and detect the dialing that the other side sends, and paired pulses formula phone, dial impulse is reflected as P ₅The variation of current potential, single-chip microcomputer is differentiated pulse number and show dialed number on LED with software.To dual tone phone, by receiver [8] reception dialing and by P ₇Mouth interrupts to the single-chip microcomputer application, and having no progeny promptly in the single-chip microcomputer response, peek shows.

To dual-tone dialing, when carrying machine, telephone set, often causes P owing to voltage jump between V-N ₇The mouth application is interrupted, thereby can show a random number with leading to errors, and has taken the dailing bit of a setting.For this reason, the utility model has adopted monostable trigger [7], its sub-P in putting forward the machine process ₆Mouth produces a pulse, and single-chip microcomputer is at P ₇Interrupt service routine at first check P ₆Mouthful, if this pulse is arranged, show it is to put forward the mistake that power traction rises to interrupt, then do not peek and show.

This detector output signal is accurate, is easy to carry, and is cheap, easy and simple to handle, can be used as the exploitation that analog switch has carried out telephone terminal, also can be used for detections such as phone producing and selling, maintenance, has obvious social and economic benefit.

Claims (3)

1. microcomputer telephone set detector, the ring generative circuit that it is characterized in that this detector is made of analog switch and booster circuit, single-chip microcomputer [1] is value and export bus B to from additional straight flow component sine table regularly, through D/A converter [2], two-way amplifier [3] the output half-sinusoid voltage I to analog switch [4] ₁, I ₂Input, the control end C of analog switch ₁, C ₂Be subjected to the output P of single-chip microcomputer [1] ₁, P ₂Control, circuit output end O ₁, O ₂Alternately export half-sinusoid voltage to step-up transformer two former limits, through transformer [6] output of boosting.

2. microcomputer detector according to claim 1, the ring output isolation technology that it is characterized in that this detector is by reverser F ₁, F ₂, NOR gate H and triode T ₂Constitute triode T ₂End output and systematically isolation.

3. microcomputer telephone set detector according to claim 1 when it is characterized in that carrying out dual-tone dialing, is provided with monostable trigger [7] in the circuit

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