JPH0251939A - Telephone set - Google Patents

Abstract

PURPOSE:To attain automatic hook-off state by providing a line control circuit applying switching control to the connection to a line and a howler signal detection circuit sending a detection signal to the line control circuit upon the detection of a howler signal. CONSTITUTION:When a howler signal detection circuit 2 detects a howler signal, a control signal (a) is sent to an on-hook control circuit 1. The on-hook control circuit 1 incorporates a relay connecting to a trunk line 10, the relay is deenergized upon the receipt of a control signal (a), the trunk line 10 and the telephone set circuit 3 are disconnected, a trunk line loop is opened to cause the on-hook state. Since the on-hook state is reached automatically prior to the reception of unpleasant tone such as howler tone, a trouble of artificial on-hook is avoided.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to telephones.

[Conventional technology]

Conventionally, when a howler signal is input to this type of telephone, it sends out a howler sound to notify when the telephone is off-hook for a certain period of time when it is not in a call state, and the person who hears the howler sound can set the handset. It was configured to go on-hook, activate the hook switch, and open the connection to the line.

[Problem to be solved by the invention]

The above-mentioned conventional telephone has a howler sound that alerts you to a call! The system is configured to let you know when the phone has been off-hook for a certain period of time when the phone is not connected, and the person who hears the notification can artificially go on-hook, so the howler sound can cause discomfort to people around the phone. Another drawback is that the person who hears the howler sound has to go on-hook, which is annoying.

[Means to solve the problem]

The telephone set of the present invention includes a line control circuit that controls opening and closing of a connection to a line, and a howler signal detection circuit that sends a detection signal to the line control circuit when a howler signal is detected from the line.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, the telephone of this embodiment includes a telephone circuit 3 having a telephone communication network, a howler signal detection circuit 2 for detecting a howler signal from a central office line 10, and an on-hook circuit for controlling opening and closing of the connection to the central office line 10. The control circuit 1 includes a control circuit 1.

Next, the operation of this embodiment will be explained with reference to the drawings.

During a normal call, the telephone circuit 3 is in an off-hook state and is connected to the central office line 10 through the on-hook control circuit 1. Also, howler signal detection time 1? , 2 is also central line 1
0, and if the telephone circuit 3 is not in an on-hook state even though the call has ended, a howler signal is input from the central office line 10 after a predetermined time has elapsed. Howler signal detection circuit 2
When detected, a control signal a is sent to the on-hook control circuit 1.

The off-hook control circuit 1 has a built-in relay (not shown) connected to the office line 10, and upon receiving the control signal a, the relay is turned off, disconnecting the office line 10 and the telephone circuit 3, and opening the office line loop. This will result in an on-hook state.

In addition, when making a call using the telephone circuit 3 after being automatically on-hook, the relay is restored (turned on) using a switch (not shown) provided in the on-hook control circuit 1, and then normally You can make a call by following these steps.

Note that the configuration of the on-hook control circuit 1 is not limited in the scope of the present claims.

〔Effect of the invention〕

As explained above, the present invention detects a howler signal by a howler signal detection circuit connected to the line, and the on-footer control circuit that receives the detection signal automatically releases the line and puts it in an on-hook state. Since the device automatically enters the on-footer state before receiving the unpleasant and angry howler sound, it has the effect of eliminating the troublesome operation of artificially turning on-hook.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... On-hook control tIg circuit, 2... Howler signal detection circuit, 3... Telephone circuit 510... Office line.

Claims (1)

[Claims] The line control circuit includes a line control circuit that controls opening/closing of a connection to a line, and a howler signal detection circuit that sends a detection signal to the line control circuit when a howler signal is detected from the line, and the line control circuit receives the detection signal. The telephone set then releases the connection to the line.