JPS6041906B2 - Telephone call notification device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a telephone call notification device.

Traditionally, incoming call notification devices have traditionally used a system that receives an incoming call signal from a telephone line and rings a bell built into the phone to notify the incoming call. Instead of ringing a bell on a telephone device, electronic private branch exchange (PABX), etc., an electronic circuit is used to make a speaker etc. ring as a tone ringer sound and convert it into a pleasant electronic sound.

In the method of making a speaker etc. sound, an incoming signal is transmitted to the speaker via an electronic circuit consisting of an oscillation circuit, an amplifier circuit, and other control circuits, and the speaker is made to sound. In the event of a failure or a power outage to the AC power input, the system would switch to a ringing route that would ring another additional bell.

However, in this type of system, the sound path of the speaker is composed of various electronic components and numerous circuits, so even if the power supply voltage is normally applied, the electronic components in the sound path may be damaged. If one of them is out of order, the ringing operation by the ringing path of this speaker is not switched to the ringing operation of the bell, which has the disadvantage that the incoming call notification function does not work properly.

Therefore, it is an object of the present invention to ensure that even if the ringing path of a speaker or the like is configured with a complex electronic circuit as described above, in response to a failure in a part of the ringing path, an incoming call is reliably alerted by a bell. It is an object of the present invention to provide a switchable telephone call notification device.

An embodiment of this invention is shown in the figure.

That is, this telephone incoming notification device includes a notification signal generation circuit 2 that receives an incoming call signal on a telephone line 1 and converts it into a notification signal, and a regular incoming call notification that receives a notification signal from the notification signal generation circuit 2 and notifies the incoming call. section 3, and an auxiliary call notification section 4 which is connected to the telephone line 1 and receives an incoming call signal and notifies the incoming call.
A power supply unit 5 supplies power to the notification signal generation circuit 2, and the auxiliary incoming call notification unit 4 responds to the AND signal of the output signal of the power supply unit 5, the input stage signal and the output stage signal of the notification signal generation circuit 2. and a switching circuit 7 for disconnecting the connection path 6 to the telephone line 1. The notification signal generation circuit 2 includes an incoming transformer 8 that receives an incoming signal (16 Hz), a rectifier circuit 9 that rectifies the secondary AC signal of the incoming transformer 8, and a pulsating output of the rectifier circuit 9 and converts it into a DC signal. It consists of a waveform shaping section 10, a tone ringer oscillation circuit 11 which receives the output from the waveform shaping section 10 and generates an audible frequency signal, and an amplifier 12 which amplifies the output of the tone ringer oscillation circuit 11.

The regular incoming call notifying section 3 is constituted by a speaker, and the auxiliary incoming call notifying section 4 is constituted by an additional bell. The power supply section 5
is composed of a power transformer 14 whose primary side is connected to an AC power source 13 and a rectifier circuit 15.

The AND signal is input to the input side of the AND gate 16 by the output signal of the rectifier circuit 15, the secondary side signal of the incoming transformer 8,
The signals are obtained by inputting the output signals of the amplifiers 12, respectively.

Note that the secondary side signal of the incoming transformer 8 is processed by the waveform shaping unit 17, and the output signal of the amplifier 12 is processed by the waveform shaping unit 1.
8 to convert it into a DC signal. and,
The switching circuit 7 includes a transistor 19 that receives the output signal of the AND gate 16, and a relay 20 connected in series to the transistor 19. The normally closed contact 20b of the relay 20 connects the telephone line 1 to the auxiliary incoming call. He is trying to connect and disconnect the connection path 6 which connects with the notification part 4.

The operation of this telephone call notification device is as follows. When an incoming call signal with a frequency of 16 Hz arrives on the telephone line 1, the incoming call transformer 8 receives it, converts it into a pulsating current in the rectifier circuit 9, and inputs the output to the waveform shaping unit 10, which sends an incoming call notification unit (not shown) using a lamp or the like. to start.

On the other hand, the shaped output from the waveform shaping section 10 activates a tone ringer oscillation circuit 11, and the oscillated audible signal (tremolo) passes through an amplifier 12 and is applied to the regular call notification section 3, causing it to ring.

Further, the output of the amplifier 12 is converted into a DC signal via a waveform shaping section 18 and input to one input terminal of an AND gate 16.

The other two input terminals of this AND gate 16 are input with the secondary side signal of the incoming transformer 8 sent via the waveform shaping section 17 and the output signal of the rectifier circuit 15 of the power supply section 5, respectively. When the three inputs are normal, the transistor 19 is turned on and the relay 20 is driven, so the normally closed contact 20b is opened and the auxiliary incoming call notification section 4 does not ring, and the normal incoming call notification section 3 based on the path of the notification signal generation circuit 2 chisel sounds. Now, suppose that the AC power supply 13, the power supply section 5, and the waveform shaping section 17 are all operating normally, and for example, only the amplifier 12 of the notification signal generation circuit 2 has failed.
The regular incoming call notification unit 3 consisting of a speaker does not ring.

At this time, there is no input to the input terminal of the AND gate 16 that passes through the waveform shaping section 18, so the transistor 1
9 turns off and stops driving the relay 20, normally closed contact 20b
is closed, and an auxiliary call notification section 4 consisting of an additional bell rings in place of the regular call notification section 3. As described above, the telephone incoming call notification device of the present invention includes a notification signal generation circuit that receives an incoming call signal on a telephone line and converts it into a notification signal, and a general function that receives a notification signal from the notification signal generation circuit and notifies the incoming call. an incoming call notification unit, an auxiliary incoming call notification unit that is connected to a telephone line and receives an incoming call signal and notifies the incoming call, a power supply unit that supplies power to the notification signal generation circuit, an output signal of this power supply unit, and an output signal of the notification signal generation circuit. Since it is equipped with a switching circuit that disconnects the connection path between the auxiliary incoming call notification section and the telephone line in response to the AND signal of the input stage signal and the output stage signal, failure of the AC power supply and power supply section is avoided. In addition, even if a failure occurs in a part of the notification signal generation circuit that connects the telephone line and the regular incoming call notification unit, it is possible to detect the failure and switch to incoming call notification by the auxiliary incoming call notification unit. This has the effect that the incoming call can be notified to the recipient.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. 1...Telephone line, 2...Notification signal generation circuit, 3...
- Regular incoming call notification unit, 4... Auxiliary incoming call notification unit, 5...
Power supply section, 6... Connection path, 7... Switching circuit,
13...AC power supply, 16...-AND gate, 20...
・Relay, 20b...Normally closed contact.

Claims (1)

[Claims] 1. A notification signal generation circuit that receives an incoming call signal on a telephone line and converts it into a notification signal, a regular incoming call notification section that receives a notification signal from this notification signal generation circuit and notifies an incoming call, and a part that is connected to the telephone line and converts the incoming signal into a notification signal. an auxiliary incoming call notification unit that receives a call and notifies the incoming call; a power supply unit that supplies power to the notification signal generation circuit; and a switching circuit for cutting off a connection path between the auxiliary call notification section and a telephone line.