JPS5860860A - Telephone set with function of detecting off-hook of handset - Google Patents

Abstract

PURPOSE:To make outgoing-incoming connections without reference to the off- hook state of a handset, by providing a howler tone detector connected in parallel to the line between a bell circuit and a handset circuit, and a switch which is turned on through the operation of said detector. CONSTITUTION:A howler tone detector 1 is connected in parallel to the line between a bell circuit and a handset circuit, and a switch 2 is turned off through the operation of the detector 1 is connected in series to the line. A howler tone detector holding button 3 holds the detection state of the detector 1. When a handset 5 is put off the hook of the telephone set, the hook switch HS0.1 is still closed and a handset connecting circuit 4 and the detector 1 are placed in operation. An exchange side sends a howler tone to the receiver R a specified time after the handset is put off the hook. Once the detector 1 detects the howler tone, the switch 2 is opened to disconnect the connecting circuit 4 from the line.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone set having a handset disconnection detection function.

If a subscriber forgets to hang up the handset or disconnects the handset after the end of a call on a regular telephone, the telephone exchange sends a howler tone to the telephone and lets the subscriber hear it through the handset.

It informed me that the handset was disconnected.

In this way, in the past, subscribers had to forget about answering the handset.

There is a problem in that if the handset of a telephone is disconnected due to vibrations such as an earthquake, it becomes impossible to receive calls, causing a great deal of inconvenience to other subscribers.

The purpose of the present invention is to solve the following problems:
The present invention provides a telephone set with a handset-receiver disconnection detection function that allows for making and receiving calls, especially for making and receiving calls.

According to the invention, a howler sound detector is connected in parallel to the line between the bell circuit and the handset circuit.

A telephone set having a handset-receiver disconnection detection function is obtained, which includes a switch connected in series to the line and opened by the Howler sound detection @0 operation, and the Howler sound detection WhoO detection hold button.

Next, an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a circuit diagram showing a part of an embodiment of the present invention in block form.
is a hook switch operated by the off-off of the transmitter/receiver II5, T is a transmitter, R is a receiver, l is a howler sound detector that detects howler sounds from the telephone exchange side, and is located between the bell circuit and the handset circuit. connected in parallel to the line. 2
is connected in series to said line with a switch which is closed by the operation of the cough howler sound detector. 3 is a Howler sound detector holding button for maintaining the detection state of the Howler sound detector; 4 is a handset connection circuit in conventional telephones other than the above B, C, H8°T, and R; 5 is a handset; .

Consider a case in which the handset 5 is detached from the telephone main body in a telephone having such a configuration.

When the handset is disconnected, the hook switch Ha.
The howler sound detector 1 is now in an operable state.

If the handset is disconnected for a certain period of time, the telephone exchange sends a p-howler sound to the handset R. Howler sound detection i1
When a howler sound is detected at step 1, switch 2 operates and opens to disconnect the handset connection circuit 4 from the line. Perform display. This state is the same as when the handset 5 is on-hook. When an incoming call is received in this state, bell B rings, and the called party recognizes the off-hook state of the handset by looking at the visual display, and when the howler sound detection hold button 3t is operated, switch 2 is restored and closed, and the hook switch is activated. Since the H8o is still operating, the handset connection circuit 4 and the line are connected and a call can be made.

Further, when the handset 5 is turned on-hook, the howler detector is restored by H8°, and the normal state is restored by turning on-hook at the time when the visual display tII is notified. Therefore, when sending out.

・Handset 5f: Go back on-hook and use handset 5 again.
If you remove it from the phone, you can make outgoing connections as usual.

Mae, send/receive i! ! ! When the telephone is disconnected from the telephone, switch 2 is restored and the line is connected to the handset connection circuit 4, and switch 2 is activated on the exchange side. At the time of recovery, Yt is detected as if it were off-hook, so the conventional 9
outgoing connections are possible.

Also, if you add timing to the howler sound detection operation,
During that time, the subscriber turned on the howler sound detector and turned on the handset.
There is a possibility that it may go on-hook.

This is effective in guarding against continued disconnection of the handset 5.

The present invention has the advantage that even when the handset is disconnected, a call can be connected without any problem.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention. H86,...Hook switch, 1...
・Howler sound detector, 2... Switch for operating when howler sound is detected. 3...Howler sound detection hold button% 4...
... Diagram 1 for sending and receiving calls

Claims (1)

[Claims] a howler sound detector connected in parallel to a line between a bell circuit and a handset circuit; a switch connected in series to the line and opened by the operation of the howler sound detector; and detection of the howler sound detector. A telephone having a handset disconnection detection function including a hold button.