JPH01216665A - Telephone set - Google Patents

Abstract

PURPOSE:To prevent mis-connection between a facsimile equipment and a telephone set by monitoring a call signal (CNG signal) sent from the facsimile equipment at all times and detecting the signal. CONSTITUTION:When a voice signal comes to a telephone line 103, a CNG detection circuit 1 is not activated. Thus, the 1st and 2nd switches 7, 8 are closed and the signal enters a ringer circuit 3 through a delay circuit 9 and a hook switch 6 to energize a bell. When a signal from the facsimile equipment comes to the telephone line 103 in error, a CNG signal is sent from the facsimile equipment. Thus, the signal is detected by the CNG detection circuit 1 to open the switches 7, 8 thereby preventing the connection to the telephone set main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone, and more particularly to a silent automatic reception circuit.

[Conventional technology]

Conventionally, even if a facsimile machine accidentally calls a telephone, the telephone picks up the receiver (hook-on).
If you do not disconnect the line, confirm the transmission from the facsimile machine and put the receiver back on the hook-off), the call will continue.

[Problem to be solved by the invention]

With the conventional telephones mentioned above, even if a facsimile machine makes a call to this telephone by mistake, the telephone will ring as usual, and the telephone will pick up the receiver and confirm that the other person is calling the facsimile machine. However, the problem was that the bell would continue to ring forever unless the receiver was put back on and the line was disconnected.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a telephone that automatically rings the ring when a call is made by mistake.

[Means to solve the problem]

The configuration of the present invention includes a circuit for detecting a CNG signal sent from a facsimile device via a telephone line, and a means for disconnecting the telephone circuit from the telephone main body using a control output of this circuit. Features.

〔Example〕

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

FIG. 1 is a block diagram showing a telephone according to an embodiment of the present invention. In the figure, the telephone of this embodiment has a telephone line 1
A CNG detection circuit 1 that detects a calling signal (CNG) from a facsimile device sent through 03, a telephone body 2, a ringer circuit 3 that is built in the telephone body 2 and generates a ringing sound, and a 2 for transmission and reception. /41m conversion, a dialer circuit 5 that converts dials or numeric keys into tone or pulse signals, and a telephone line 103.
A hook switch 6 that turns on/off in response to a signal sent through the switch, a first switch (SWI) 7 that turns on/off in response to a control signal 101 from the CNG detection circuit 1, and a control signal 102 from the CNG detection circuit 1. A second switch (SW2) 8 that turns on/off by
A delay circuit 9 is included and configured to delay the signal on the telephone line 103 for a period of time during which the signal is detected.

Next, the operation of this block will be explained.

First, when a voice signal comes to this telephone line 103', C
The NG detection circuit 1 does not operate at all. For this reason, the first. The second switch 7.8 is also closed, and the delay circuit 9. It passes through the hook switch 6, enters the ringer circuit 3, and sounds a bell. When the handset is lifted up, the hook switch 6 is connected to the speech circuit 4 and the dialer circuit 5, and a call can be made using the handset connected to the speech circuit 4I.

Next, a case will be described in which a signal from a facsimile machine is mistakenly sent to the telephone line 103. In this case, a calling signal (CNG signal shown in FIG. 2) is first sent as a signal from the facsimile machine.

Therefore, this signal is detected by the CNG detection circuit 1, and the first . Second switch7.
8 to prevent connection to the telephone body 2. Here, the delay circuit 9 guarantees a period (time) for CNG detection in this case.

Generally, when communicating between facsimile machines, the communication procedure is determined, and the facsimile machines of groups 1 to 3 follow the T30 tonal or binary procedure, and the calling terminal first sends a signal as shown in Figure 2. It is sending out a type of calling tone (CNG) signal.

Therefore, in the non-ringing automatic reception circuit of this embodiment, this CN
It includes a circuit that detects the G signal and a circuit that controls on/off the line to the telephone based on the output signal of this circuit.

In the conventional method, the line had to be disconnected based on the judgment of the person speaking at the called terminal, but in this embodiment, the CNG signal sent from the facsimile machine is detected and the line is automatically disconnected. can be done.

〔Effect of the invention〕

As explained above, the present invention constantly monitors and detects the CNG signal sent from the 7Axis 9 device, thereby preventing erroneous connections between the facsimile device and the telephone, and preventing the resulting noise from occurring. It has the effect of eliminating sound.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a telephone according to an embodiment of the present invention, and 2nd PgJ is a waveform diagram showing the waveform of a CNG signal from a facsimile machine. 1... CNG detection circuit, 2... Telephone body, 3... Ringer circuit, 4... Speech circuit, 5... Diameter 2 circuit, 6...
・Hook switch, 7.8...Switch, 9・
... Delay circuit, 101.102 ... Control signal, 103 ... Telephone circuit. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] C sent from a facsimile machine over a telephone line
1. A telephone set, comprising: a circuit for detecting an NG signal; and means for disconnecting the telephone line from the main body of the telephone by means of a control output of the circuit.