JP2901485B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus, and more particularly to a facsimile apparatus connected to a telephone line and an external telephone.

[0002]

2. Description of the Related Art A conventional facsimile apparatus connected to a telephone line and an external telephone is provided with one type of PB signal detecting section, in which an input signal matches a reception start signal. Then, facsimile reception was started.

Another conventional example is disclosed in Japanese Unexamined Patent Publication No.
There is a "switching method between facsimile and telephone" described in Japanese Patent Publication No. 265267. According to this method, in a facsimile apparatus operated by sharing a line (24) with a telephone (23), a first switching means (22) for switching the line (24) to the telephone (21) and a second switching means for the line (24). Switching means (2
5) a detecting means (26) for detecting a facsimile signal connected via the first means and an output of the first detecting means (26).
Control means (27) and (28) for controlling the switching means (22) or the second switching means (25), and a call or facsimile is performed by switching the first switching means (22) or the second switching means (25). I try to receive.

That is, by detecting the presence or absence of a facsimile signal and disconnecting the facsimile apparatus or telephone from the line and automatically starting facsimile reception without manual operation, the objective is to reduce cost and improve operability. It was done.

[0005]

In this conventional facsimile apparatus, whether the PB signal detected by one type of PB signal detection unit is a signal transmitted from a partner terminal via a telephone line, or It was not possible to determine whether it was a facsimile reception start signal from an external telephone of the facsimile apparatus.

Accordingly, when the operator of the communication partner terminal sends out a reception start signal (PB signal) to cause the terminal to perform facsimile reception, the reception start signal is input to the facsimile apparatus via the telephone line. As a result, an erroneous incoming call may be made to the facsimile machine. In order to prevent this erroneous call, the facsimile reception start function based on the above-mentioned reception start signal is limited to be valid only at the time of an incoming call, so when the facsimile apparatus becomes the calling side, the facsimile reception start function is used. There was a problem that it was not possible.

Another conventional example is completely different from the present invention in the purpose, configuration, operation and effect.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile apparatus which determines whether a source of a reception start signal is a telephone line side or an external telephone, and starts facsimile reception only in the latter case. It is in.

[0009]

According to the present invention, a facsimile apparatus connected to a telephone line and an external telephone detects the level of a PB signal from the telephone line.
A first level detector, and a PB from the external telephone.
A second level detector for detecting a signal level;
A signal for generating a level difference between the first and second level detectors;
Signal attenuator and output signals of the first and second level detectors
And a difference detection unit for detecting a difference between P and P from the telephone line.
The external telephone through the B signal and the signal attenuator
A PB signal detector for detecting a PB signal from
Detecting the difference when a signal detection unit detects the PB signal
A control unit for determining a source of the PB signal from an output of the unit;
The control unit starts facsimile reception only when it determines that the reception start signal detected by the PB signal detection unit is a signal input from the external telephone .
And a facsimile machine characterized by the following.

[0010]

[0011]

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

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus according to the present invention.

Referring to FIG. 1, the present embodiment employs a telephone line 9.
A first level detector (LVDA) 1 for detecting the level of a PB signal from the first and a second level detector (LVDA) for detecting the level of a PB signal input from an external telephone (TPH) 7 through a connection cord 8 LVDB) 2, a signal attenuator (ATT) 3 for generating a level difference between LVDA1 and LVDB2, a difference detector (DFRD) 4 for detecting a difference between output signals of LVDA1 and LVDB2, and a telephone line 9. PB signal and TPH7 through ATT3
Signal detection unit (PBDT) for detecting the PB signal from the PBDT
5 and DFRD4 when PBDT5 detects the PB signal.
(CT) that determines the source of the PB signal from the output of
L) 6.

Next, the operation of this embodiment will be described.

When the TPH 7 communicates with the partner terminal via the telephone line 9 by a known method and receives a notification from the partner terminal that facsimile transmission is to be performed, the operator of the TPH 7 receives a reception start signal (PB signal) based on a predetermined PB signal. For example, "12 *") is transmitted to the facsimile apparatus through the connection code 8.

This reception start signal is input to LVDB2 and also to PBDT5 via ATT3.

In the PBDT 5, when the input PB signal matches the reception start signal "12 *", the reception start request signal d
To CTL6.

On the other hand, the LVDB 2 detects the level of the reception start signal and outputs the level b to the DFRD 4. Further, the LVDA 1 detects the level of the reception start signal input through the ATT 3 and outputs the level a to the DFRD 4. Here, the reception start signal input to LVDA1 is A
Since a predetermined level attenuation is added by TT3,
Level a <level b.

The DFRD 4 compares the level a from the LVDA 1 with the level b from the LVDB 2, and sends a reception start notification signal c to the CTL 6 when level b−level a> 0, that is, when level b is larger than level a.

The CTL 6 receives a PB signal from the reception start notification signal c.
The reception start request signal d from the DT 5 is determined to be a reception start request signal from the TPH 7, and a facsimile receiving unit (not shown) is started by a known method to start facsimile reception.

Next, when a PB signal is input from the telephone line 9, the PBDT 5 sends a reception start request signal d to the CTL 6 when the PB signal matches "12 *".

On the other hand, the level a> the level b, because the PB signal which has been subjected to a predetermined level attenuation by the ATT3 is input to the LVDB2. The DFRD4 compares the level a from the LVDA1 with the level b from the LVDB2, and does not output the reception start notification signal because the level b is lower than the level a <0, that is, the level b is smaller than the level a.

At this time, CTL6 receives the reception start request signal d
Is determined to be a request signal from the partner terminal through the telephone line 9, and the reception start request signal is ignored. That is, the facsimile apparatus does not start the facsimile reception operation.

As described above, in the present embodiment, the facsimile reception operation is started only when the reception start request is received from the external telephone (TPH7) of the facsimile apparatus.

[0025]

As described above, according to the present invention, a facsimile apparatus connected to a telephone line and an external telephone detects the level of a PB signal from the telephone line.
Level detector and the level of the PB signal from the external telephone.
A second level detector for detecting the level, and a first and a second level.
A signal attenuator that generates a level difference between the
1, a difference for detecting a difference between output signals of the second level detector
Minute detector, PB signal from telephone line and signal attenuator
Signal to detect PB signal from external telephone through
When the signal detector and the PB signal detector detect the PB signal
Control for determining the source of the PB signal from the output of the difference detection unit
And a section, the control unit by starting the facsimile reception only when it is determined that the signal reception start signal detected is PB signal detection unit is input from the external telephone, from an external terminal through the telephone line This has the effect of preventing malfunction due to the reception start signal.

Further, the conventional facsimile reception start function based on the reception start signal has an effect that it is not necessary to set a restriction that it is effective only at the time of an incoming call.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st level detection part (LVDA) 2 2nd level detection part (LVDB) 3 Signal attenuation part (ATT) 4 Difference detection part (DFRD) 5 PB signal detection part (PBDT) 6 Control part (CTL) 7 Outside Attached telephone (TPH) 8 Connection code 9 Telephone line a, b level c Reception start notification signal d Reception start request signal

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 11/00 H04N 1/00 H04N 1/32

Claims (1)

(57) [Claims] In a facsimile apparatus connected to a telephone line and an external telephone, a PB from the telephone line is provided.
A first level detector for detecting a signal level;
Second level for detecting the level of the PB signal from the attached telephone
A level between the bell detector and the first and second level detectors.
A signal attenuator for generating a bell difference;
A difference detection unit that detects a difference between output signals of the bell detection unit,
Through the PB signal from the telephone line and the signal attenuator
PB signal for detecting a PB signal from the external telephone set
Signal detector and the PB signal detector detects the PB signal
Generating the PB signal from the output of the difference detection unit
And a control unit for determining the source.
Facsimile apparatus characterized by starting the facsimile reception only when the received activation signal No. detecting unit detects is determined to be a signal inputted from the external telephone.