KR950003319B1 - Automatic hold-on releasing circuit - Google Patents

Abstract

The circuit reduces the user time for standby cancel function for the telephone, and improves the service. The circuit includes an off hook controller(4) which connects to multi telephones, a melody generator(5) which generates melody sound, a speaker dirver(6) which drives the speaker, the automatic standby cancel circuit which transfers standby/cancel modes, a hook switch(3) which toggles on/off actions, a hold switch(2) , and a voltage memory block(1) which charges voltage, and transistors(Q1-Q3), resistors(R1-R10), condensers(C1-C4), and diodes(D1-D3).

Description

Automatic standby wakeup circuit of telephone

1 is an automatic standby release circuit diagram of a telephone according to the present invention.

* Explanation of symbols for main parts of the drawings

1: voltage storage unit 2: hold switch

3: hook switch 4: off-hook control unit

5: melody generating unit 6: speaker driving unit

7: speaker 8: automatic standby release circuit

Q1-Q3: Transistor C1-C4: Capacitor

R1-R10: Resistor D1-D4: Diode

The present invention relates to an automatic standby canceling circuit of a telephone to automatically release a hold sound and a standby state when a plurality of telephones connected to the same trunk line are used in the telephone.

In general, a telephone is used when multiple telephones are connected on the same trunk line. When the first receiver connects the telephone line to make a call with another receiver, the first receiver is held after confirming that the telephone is pressed by pressing a hold switch that generates a melody sound. The button is "off" and the handset is placed on the body of the phone, or a mechanical switch is used to interconnect the caller and the other party's phone, but in the case of the former, the handset is raised to the body of the phone before the call is made with the other party. If you put it on, it will not generate a melodic sound to inform you of the waiting state, and when connecting with other receivers, the first receiver will be time-consuming and hassle-free. The lack of credibility .

The present invention is to solve the above-mentioned shortcomings, to provide an automatic standby release circuit composed of a combination of a transistor, a resistor, a capacitor, and a diode, and the melody when the first receiver among several telephones connected to the same trunk line connects another receiver. If you press the tone-producing Hold button and then place the handset on the main body of the phone, the state of the call is maintained as well as the hold status of the original recipient's phone is automatically released by listening to the handset of another telephone connected to the same trunk line. The purpose is to contribute to the improvement of the reliability of the phone by eliminating the hassle of consumers due to the addition of the function by notifying the people around the call that the melody sound is output from the.

This will be described with reference to the accompanying drawings.

The off-hook control unit 4 connected to several telephones on the same trunk line, the melody generating unit 5 for generating melody sound, and the speaker driving unit 6 for driving the speaker 7 for outputting the generated melody sound are provided. In the provided telephone, an automatic standby canceling circuit (8) for automatically switching the signal received by the off-hook control unit (4) to the standby / release mode is added, but the automatic standby canceling circuit (8) maintains a call waiting state. A hook switch 3 for turning on / off, a hold switch 2 for holding an input signal, a voltage storage unit 1 for charging an applied voltage, a transistor Q1-Q3 for switching and a resistor for stabilizing an applied voltage (R1-R10) Capacitors (C1-C4) are provided with diodes (D1-D3).

Hereinafter, the operation and effects of the present invention will be described with reference to the accompanying drawings.

First, when a plurality of telephones are connected to the off-hook control unit 4, the first receiver listens to the sender's voice through the handset's handset.

At this time, when talking with a person who has another telephone, when the contact point ⓐ and ⓑ of the hook switch 3 are connected and turned on, the received signal via the off-hook control unit 4 is connected to the hold switch 2 and the diode. As the bias voltage is applied to the base terminal of the transistor Q2 via the D3 and the resistor R6 to turn the transistor Q2 "on", the collector terminal potential changes to a "0" potential to turn the transistor Q1 into a bias voltage. By making the conduction state, the received signal output from the off-hook control section 4 passes through the collector terminal at the emitter terminal of the transistor Q1, and then again the resistors R1, R3, capacitor C2, and resistor R4, R5. The closed loop is formed by continuously supplying the bias voltage to the base terminal of the transistor Q2 via the circuit), so that the transistor Q1 continues to operate and the output signal thereof passes through the resistor R1. And melody generator (5) and speaker drive As the unit 6 applies a voltage capable of operating, the melody generating unit 5 generates a melody sound, which is a standby sound of the transmitter generated and output from the melody generating unit 5, and is driven by the rear speaker driving unit 6. The melody sound generated at) is output through the speaker 7.

At this time, when the handset is placed on the main body of the phone, the hook switch 3 is switched to the ⓑⓒ contact point so that the received signal cannot pass through the hold switch 2, but the transistor Q1 is kept in the "turn-on" state, so the melody sound is the speaker. Continued output through (7).

Therefore, even if the original receiver's telephone handset is placed on the telephone body before making a call with another telephone, the call signal is not disconnected and the melody sound is continuously output through the speaker 7.

On the other hand, when the other receiver picks up a separate telephone handset, the output impedance of the off-hook control unit 4 is lowered because several telephones are connected in parallel, so that the voltage storage unit (1) As the voltage discharged from the capacitor C3 of the capacitor C3 is lower than the voltage applied to the base terminal of the transistor Q1 via the diode D2, the transistor Q1 is switched to the " turn off " state. 4) and the melody generating unit 5 and the speaker driver 6 are not applied to the operating voltage is completely blocked and at the same time stop the melody sound output from the speaker 7 to release the standby state.

In addition, the method of automatically releasing the standby state is that the handset is placed on the main body of the telephone within a short time, and then the hook switch 3 is moved from the ⓑⓒ contact to the ⓐⓑ contact to discharge the instantaneous discharge voltage of the capacitor C4. As the transistor Q3 is applied to the base terminal, the transistor Q3 is " turned on " to cut off the bias voltage applied to the transistors Q2 and Q1 to generate the off-hook control unit 4 and the melody as described above. The operation of the unit 5 and the speaker driver 6 is to be stopped.

Here, the capacitor C1 and the resistor R2 are stabilized so that the transistor Q1 is not malfunctioned by the mixed noise, the other resistor is a resistor to protect each stage, and the diode prevents reverse current.

As described above, the present invention provides an automatic standby release circuit composed of a combination of a transistor, a capacitor, a resistor, and a diode, and when the multiple receivers are connected to the same trunk line, the first receiver presses a hold switch when connecting another receiver. Even if the next handset is placed on the main body of the phone, when the handset of another phone is lifted, the phone can be disconnected from the original receiver line and the standby state that stops the melody sound is automatically removed, eliminating the user's time and hassle. It can greatly contribute to improving the reliability of.

Claims (1)

Off-hook control unit 4 having multiple telephones connected to the same trunk line, melody generating unit 5 for generating melody sound, and sputter driver 6 for driving speaker 7 for outputting the generated melody sound In the telephone equipped with, an automatic standby canceling circuit (8) for automatically switching the signal received by the off-hook control unit 4 to the standby / release mode, the automatic standby canceling circuit (8) is a call waiting Stabilizes the applied voltage with a hook switch (3) for turning on / off the state, a hold switch (2) for holding an input signal, a voltage storage unit (1) for charging an applied voltage, a switching transistor (Q1-Q3) And a resistor (R1-R10) capacitor (C1-C4) diode (D1-D3).

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