KR19990013705U - Circuit indicating the state of use of the telephone - Google Patents

Abstract

end. TECHNICAL FIELD OF THE INVENTION

Circuitry that indicates that the phone is in use

I. The technical problem that the invention is trying to solve

Provided is a circuit for driving an LED indicating that the telephone is in use without being controlled by the microcomputer in the telephone.

All. The point of solution of design

Switch to cut off / supply the power supplied from the CO line to the telephone as it is turned on / off, a rectifier for rectifying and outputting the power supplied through the switch, and indicating that the phone is turned on as a forward current is supplied from the rectifier. It consists of LEDs.

la. Important uses of the devise

It is possible to reduce the load on the microcomputer because the phone can run an LED indicating that the phone is busy without the microcomputer control.

Description

Circuit indicating the state of use of the telephone

The present invention relates to a circuit for indicating the state of use of the phone, and more particularly to a circuit for indicating the formation of the call without the control of the microcomputer in the phone.

1 is a block diagram of a telephone having a circuit for driving an LED for indicating that a call is in progress. The microcomputer 100, the key input unit 110, the display unit 120, the ring sensing unit 130, the hook switch SW1, the bridge diode 140, and the voice processing unit are shown in FIG. 150, the output amplifier 160, the speaker 161, the input amplifier 170, the microphone 171 and the call status display unit 180.

Referring to Fig. 1, the operation of a circuit for driving an LED for indicating that a conventional telephone is in a call will be described. The key input unit 110 applies key data corresponding to the key pressed by the user to the microcomputer 100. When the microcomputer 100 receives the key data corresponding to the call key from the key input unit 110, the microcomputer 100 controls the call state display unit 180 to indicate that the microcomputer 100 is in the call state. Transistor Q1 is turned on by applying a high signal to the base of Q1. The call state display unit 180 includes a transistor Q1 and a light emitting diode D1, and receives a control signal from the microcomputer 100 to turn on / off the LED driving transistor Q1 to operate the light emitting diode D1. That is, the call state display unit 180 receives the control signal from the microcomputer 100 to turn on / off the diode D1 to indicate whether the call is in progress.

As described above, the circuit for displaying a call state in the conventional telephone detects whether the call is busy and controls the call state display unit through one control port. Therefore, since a circuit for displaying a call state in the conventional telephone occupies the control port of the microcomputer, there is a problem in that an extra capacity of the microcomputer must be secured in order to add other functions.

Accordingly, an object of the present invention is to provide a circuit for displaying the use state of the telephone.

Another object of the present invention is to provide a circuit for indicating that a telephone is busy.

Another object of the present invention is to provide a circuit that simply displays the call state without the control of the microcomputer in the phone.

The present invention for achieving the above object is a switch to cut off / supply the power supplied to the telephone from the CO line as on / off, a rectifier for rectifying and outputting the power supplied through the switch, the forward current from the rectifier It is characterized in that it is configured as a light emitting diode that is turned on as a supply to indicate that the call.

1 is a block diagram of a telephone having a circuit showing a conventional call.

2 is a block diagram of a telephone having a circuit showing a use state according to an embodiment of the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even though they are shown in different drawings. In addition, in the following description of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

FIG. 2 is a block diagram of a phone including a circuit for indicating that a call is in accordance with an embodiment of the present invention. The diode 140 includes a sound processor 150, an output amplifier 160, a speaker 161, an input amplifier 170, a microphone 171, and a light emitting diode D2.

With reference to Figure 2 will be described the operation of the circuit to indicate that the call in the telephone according to an embodiment of the present invention. If the user picks up the handset when attempting a call, the switch SW1 is turned on to supply power to the telephone from the CO. In addition, when the user hears a telephone call and a ring signal is transmitted, the user picks up the receiver, the switch SW1 is turned on and power is supplied from the trunk line to the circuit of the telephone. As the switch SW1 is turned on, the bridge diode 140 receives power supplied from the trunk line and rectifies and outputs the power to be used as an operating power source of the telephone. The light emitting diode D2 is turned on when the forward current is supplied from the bridge diode 140 to indicate the state of the telephone. Therefore, the user can see that the light emitting diode D2 is turned on to confirm that the phone is in a call state.

As described above, the present invention adds a light emitting diode between a bridge diode and a voice processing unit in a telephone which is powered from a trunk line, so that the light emitting diode is turned on when a communication path is formed. Therefore, the present invention does not perform a separate control operation of the microcomputer, and displays whether the call path is formed according to the on / off state of the light emitting diode, so that the user can easily check whether the call is formed. In addition, the present invention can indicate that the call without the control of the microcomputer, so that the control port of the microcomputer that was used to indicate that the conventional call can be used for other control purposes.

Claims (3)

In a circuit representing the state of use of the telephone, A hook-switch for supplying / cutting power supplied from the trunk line to the telephone as it is turned on / off, A rectifier for rectifying and outputting power supplied through the hook-switch; And an LED for indicating that the user is busy by being forwarded as a forward current is supplied from the rectifier. In a circuit representing the state of use of the telephone, A switch for supplying or cutting off power supplied from a trunk line to the telephone; Rectifier for receiving power from the trunk line as the switch is turned on, rectifying the supplied power and outputting; And a light emitting diode configured to receive a current output from the rectifier, and to turn on / off the power supply to a communication circuit or to cut off power. The method of claim 2, And a forward current is supplied to the light emitting diode when the switch is turned on so that the light emitting diode is turned on, indicating that the user is in a call.