JPH09181847A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent automatic switching to facsimile communication due to a 1100Hz signal included in its own voice signal or a surrounding environmental sound during speech by an externally mounted or built-in telephone set. SOLUTION: A control section 3 validates a 1100Hz signal cut-off function of 1100Hz cut-off filters 27, 28 in the case of the facsimile mode and cuts off the 1100Hz signal included in a voice signal received from a built-in telephone set 26 or an externally mounted telephone set 41 and provides an output of a resulting signal to lines L1, L2 and a high impedance transformer 29 to prevent mis-detection of a CNG signal by a tone detection section 30. In the case of the telephone mode. the control section 3 invalidates the 1100Hz signal cut-off function of the 1100Hz cut-off filters 27, 28 provides an output of the voice signal received from the built-in telephone set 26 or the externally mounted telephone set 41 without any modification to the lines L1, L2 to improve the voice quality during speech.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly, to a facsimile machine provided with an externally connected or built-in telephone, which is erroneously operated when a facsimile communication and a telephone conversation are automatically switched by CNG signal detection. The present invention relates to a facsimile machine to prevent.

[0002]

2. Description of the Related Art Recently, as facsimile machines have become smaller, less expensive, and have a built-in telephone function, they can be used as both a facsimile machine and a telephone by connecting to a single telephone line. Therefore, it has come to be used in general households and small and medium-sized businesses. In such general households and small and medium-sized enterprises, a new telephone line is not drawn for the facsimile device, and a telephone is connected externally,
Facsimile machines with a telephone function that have a built-in telephone are in widespread use.

In a facsimile machine having such a telephone built-in or attached externally, the CN sent from the transmitting side is sent.
When a G (Calling Tone) signal is detected, it has a built-in line automatic switching function that automatically connects the telephone line to the facsimile machine side.

As a conventional automatic line switching system based on CNG signal detection, a call / communication automatic switching system in facsimile communication (see Japanese Patent Application No. 4-142146).
In this case, if there is an incoming call when the automatic answer mode is set, the timer is started when the tone detection state is entered,
When the CNG signal is detected, the fax reception operation is performed,
When a signal other than the CNG signal is detected, it rings and waits for off-hook operation. If the facsimile machine is off-hook within a certain period of time, the line is connected to the facsimile machine side, and if the telephone is off-hook, the telephone set is called. The line is connected to the side.

[0005]

However, in the conventional facsimile apparatus having such a line automatic switching function, the CNG signal sent from the transmitting side or the signal other than the CNG signal is detected. Depending on whether to connect the line to the facsimile device side or the telephone side, it is decided whether to connect the line to the facsimile device side or the telephone side. There has been a problem that the CNG signal detection circuit malfunctions and the facsimile reception operation is started, and the call is interrupted.

That is, in the CNG signal detection circuit, the CN
Since it is configured to detect the 1100 Hz signal that is a characteristic of the G signal, 1100H included in the voice coming in from the microphone of the telephone or the surrounding environmental sound during a call.
There has been a problem that the z component is detected, and this is erroneously detected as the CNG signal to start the facsimile reception operation, and interrupt the call.

Therefore, the invention according to claim 1 is provided with signal cutoff means for cutting off a signal of the same frequency as a tone signal for automatic switching between facsimile communication and a telephone call, so that a call voice or a voice during a telephone call can be obtained. Aiming to provide a facsimile device capable of making an appropriate call by preventing a voice signal of the frequency included in the surrounding environmental sound from being erroneously detected as a tone signal for automatic switching and automatically switching. There is.

According to the second aspect of the present invention, by adding a function of invalidating the function of the signal cutoff means at the time of reception in the telephone mode, the telephone call by the telephone is performed by the signal cutoff means when automatic switching is not required. It is an object of the present invention to provide a facsimile device capable of preventing a deterioration in the sound quality of a sound and having a conversation with a good sound quality.

According to the third aspect of the present invention, by adding a function capable of arbitrarily selecting valid / invalid of the function of the signal cutoff means, an appropriate automatic line switching operation is ensured and the sound quality of the call voice is improved. It is an object of the present invention to provide a facsimile machine that can be operated.

It is an object of the present invention to provide a facsimile machine which can make a proper call even when an external telephone is used.

It is an object of the present invention to provide a facsimile machine which can make an appropriate call even when the built-in telephone is used.

[0012]

According to a first aspect of the present invention, there is provided a facsimile device which comprises a facsimile communication means for performing facsimile communication with a partner facsimile device connected by a line, and a destination via the line. A telephone for making a voice call, a tone signal detecting means for detecting a tone signal sent from the other party through the line when receiving a call, and a line switching for selectively connecting the line to the facsimile communication means and the telephone. Means, an off-hook detecting means for detecting an off-hook state of the telephone, and a state in which the line is connected to the telephone by the line switching means, there is an incoming call,
After the off-hook detection means detects that the telephone is off-hook, when the tone detection means detects a predetermined tone signal from the line, the line switching means switches the line from the telephone to the facsimile communication means. And a control means for performing facsimile reception, the signal blocking means for blocking at least a signal having the same frequency as the predetermined tone signal between the telephone and the tone signal detecting means. The above-mentioned object is achieved by providing.

Here, as the signal interruption means, for example,
A filter circuit that cuts off the same frequency as the signal for automatic switching (for example, CNG signal), for example, 1100 Hz is used.

According to the above construction, during the telephone call by the telephone, the tone signal detecting means automatically switches the signal having the same frequency as the signal for automatic switching (for example, CNG signal) included in the conversation voice or the ambient sound. Can be prevented from being erroneously detected as a signal of, and the call can be prevented from being interrupted.

According to a second aspect of the present invention, in the facsimile apparatus, the facsimile apparatus includes mode selecting means for selectively selecting a facsimile communication mode for giving priority to facsimile communication and a telephone mode for giving priority to a telephone call by the telephone. Further, the signal cutoff means can control enable / disable of a signal cutoff function for cutting off a signal of the same frequency as the predetermined tone signal by the control means, and the control means can control the mode selection means by the mode selection means. When the telephone mode is selected, the signal blocking function of the signal blocking means may be set to be invalid.

According to the above construction, when a telephone call is made in the telephone mode, that is, when automatic switching is not required, the signal blocking means prevents the sound quality of the telephone call sound from being lowered. It is possible to have a conversation with good sound quality.

According to a third aspect of the present invention, the facsimile apparatus further includes setting means for setting valid / invalid of a signal blocking function for blocking a signal having the same frequency as the predetermined tone signal. Is capable of controlling enable / disable of a signal blocking function for blocking a signal having the same frequency as the predetermined tone signal by the control means, and the control means controls the signal blocking function of the signal blocking means by the setting means. When the invalidation is set, the signal blocking function of the signal blocking means may be set to be invalid.

According to the above configuration, the signal cutoff function of the signal cutoff means can be set to valid / invalid according to the setting of the setting means, and the sound quality of the call voice can be improved while ensuring an appropriate automatic line switching operation. Can be improved.

According to a fourth aspect of the present invention, the telephone may be an external telephone connected via a predetermined connecting portion.

According to the above configuration, even when the external telephone is used, it is possible to ensure an appropriate line automatic switching operation and make an appropriate call, and improve the sound quality of the call voice. Can be made.

In the invention according to claim 5, the telephone may be a built-in telephone built in the facsimile apparatus.

According to the above configuration, even when the built-in telephone is used, an appropriate automatic line switching operation is ensured,
It is possible to make an appropriate call and improve the sound quality of the call voice.

[0023]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Since the embodiment described below is a preferred embodiment of the present invention, various technically preferable limitations are attached, but the scope of the present invention is particularly limited in the following description. Unless specifically stated to limit the present invention, the present invention is not limited to these embodiments.

1 to 4 are views showing a facsimile machine to which an embodiment of the facsimile machine of the present invention is applied. In FIG. 1, the facsimile apparatus 1 is composed of a network control unit 2, a control unit 3, an operation display unit 4, a plotter 5, a scanner 6 and the like, and each unit is connected to a bus 7.

The operation display section (selection means, signal cutoff function selection means) 4 includes a ten-key pad, a start key, a mode selection key for selecting a telephone mode or a fax mode, and 100 Hz cut filters 27, 28 (see FIG. 2) described later. In addition to having various operation keys such as function enable / disable selection keys, a display (for example, a liquid crystal display) is provided, various commands such as transmission operations are input from the operation keys, and the operation keys are input to the display. The instruction contents and various information notified to the operator from the facsimile device are displayed.

The plotter 5 is, for example, a thermal recording device using a thermal element, or an electrophotographic recording device, and the plotter 5 is, for example, a thermal recording device when the thermal recording device is used. An image is recorded directly on paper or indirectly on ordinary recording paper via an ink sheet.

The scanner 6 is, for example, a CCD (Charge C
An image scanner using an Oupled Device) is used, and the scanner scans a document and reads image information of the document at a predetermined resolution.

As shown in FIG. 2, the network controller 2 includes a DC detector 21, a hook switch 22, a relay 23, a transformer 24, a modem 25, a built-in telephone 26, 1100 Hz cut filters 27 and 28, and a high impedance transformer 2.
9, a tone detection unit 30 and a ringing signal detection unit 31, and a 1100 Hz cut filter 28.
An external telephone 41 is connected to this via a connection connector (connection part) not shown. The external telephone 41 is
Although not shown, it has a handset having a microphone and a speaker.

The DC detector 21 is connected to the lines L1 and L2, and detects whether the modem 25, the built-in telephone set 26, and the external telephone set 41 are off-hook by detecting the DC currents of the lines L1 and L2. It detects and outputs an off-hook detection signal to the control unit 3.

The hook switch 22 operates under the control of the control unit 3 and takes the built-in telephone 26 off hook.

The relay 23 operates under the control of the control unit 3 to connect the lines L1 and L2 to the modem 25 side and the external telephone 41.
Side, and connects to the line L in the standby state.
1 and L2 are connected to the external telephone 41 side.

The transformer 24 provides impedance matching between the lines L1 and L2 and the modem 25, and also isolates the lines L1 and L2 on the primary side from the modem 25 on the secondary side, while Signals are exchanged between the L1 and L2 and the modem 25.

The modem 25 modulates the digital image information read by the scanner 6 and various protocol signals input from the control unit 3 into analog signals in order to transmit them on the lines L1 and L2, and also the other party. The image information of analog signals and various protocol signals sent from the above through lines L1 and L2 are demodulated and converted into digital signals.

The extension telephone set 26 is a telephone set built in the facsimile apparatus 1 and includes a handset having a microphone and a speaker. The extension telephone 26 is 110
It is connected to the hook switch 22 and the high impedance transformer 29 via a 0 Hz cut filter (signal blocking means) 27.

The 1100 Hz cut printer 27 cuts the signal component of 1100 Hz from the voice signal input from the microphone of the handset of the built-in telephone set 26 or the ambient environmental sound signal and outputs it.

The 1100 Hz cut filter (signal cutoff means) 28 is connected to the external telephone 41 connected via the above-mentioned connector and the high impedance transformer 29.
110 from the voice signal input from the microphone of the handset of the external telephone 41 and the environmental sound signal of the surroundings.
The 0 Hz signal component is cut and output.

That is, the 1100 Hz cut filter 2
8 is connected between the connection connector for connecting the external telephone 41 and the high impedance 29, and 1100 Hz of the signal input from the microphone of the external telephone 41.
The signal component of is cut.

The 1100 Hz cut filter 27,
Reference numeral 28 denotes a function for cutting a 1100 Hz signal component, which is set to be valid or invalid by a valid / invalid switching signal input from the control unit 3, and when it is invalid, the internal telephone 26 or the external telephone 41. The 1100 Hz signal component is directly output from the voice signal input from the microphone of the handset and the surrounding environmental sound without being cut.

The high impedance transformer 29 includes the lines L1 and L2 on the primary side and the tone detector 3 on the secondary side.
Signals are transmitted to both sides while insulating from 0.

The tone detecting section 30 is connected to the high impedance transformer 29, detects a tone signal on the lines L1 and L2 during a call by the built-in telephone 26 or the external telephone 41, and sends the detected signal to the control section 3. Output.

The ringing signal detector 31 is connected to the line L1,
It is connected to L2, detects the presence or absence of a ringing signal on the lines L1 and L2, and outputs the detection signal to the control unit 3.

The control unit 3 has a CPU (Central Processing).
Unit), ROM (Read Only Memory) and RAM (Ra
ndom access memory) and the like, and a basic program as a facsimile machine, a filter valid / invalid switching processing program of the present invention, and the like are stored in the ROM. The RAM is used as a work memory, and a memory area for storing various data is formed. Control unit 3
The CPU controls each unit in the facsimile apparatus 1 in accordance with the program in the ROM, executes the sequence as the facsimile apparatus 1, and executes the filter valid / invalid switching process of the present invention.

That is, in the facsimile mode, the control unit 3 enables the 1100 Hz signal cut function of the 1100 Hz cut filters 27 and 28 in the network control unit 2 and inputs from the built-in telephone set 26 or the external telephone set 41. By cutting and outputting the 1100 Hz signal included in the audio signal, the CNG by the tone detection unit 30 is output.
Prevents erroneous detection of signals, 1100 in telephone mode
1100H included in a voice signal input from the built-in telephone set 26 or the external telephone set 41 by disabling the 1100Hz signal cut function of the Hz cut filters 27 and 28.
By preventing the z signal from being cut, it is possible to prevent the voice signal during a call from being transmitted unnaturally to the other party.

Next, the operation will be described. When the facsimile device 1 is set to the facsimile mode at the time of incoming call, the functions of the 1100 Hz cut filters 27 and 28 are enabled, and the voice signal input from the microphone of the handset of the internal telephone 26 or the external telephone 41 is input. By cutting and outputting the 1100 Hz signal component from the surrounding environmental sound and outputting, the erroneous detection of the CNG signal by the tone detecting unit 30 is prevented, and when the telephone mode is set at the time of incoming call, the 1100 Hz cut filter 27, When the built-in telephone set 26 or the external telephone set 41 is used to disable the function of 28, the 1100 Hz signal component is not cut from the voice signal input from the microphone of the handset or the surrounding environmental sound and is included in one's own voice. The 1100Hz signal is cut by the filter circuit, and the voice transmitted to the other party is Parts is obtained so as to prevent an unnatural.

The filter valid / invalid switching process will be described below with reference to the flowcharts shown in FIGS. 3 and 4. First, the filter valid / invalid switching process for controlling the valid / invalid of the 1100 Hz cut filters 27 and 28 based on the setting state of the selection mode shown in FIG.
explain.

In the standby state, the facsimile apparatus 1 connects the lines L1 and L2 to the external telephone 4 by the relay 23.
Connected to the 1 side, 1100Hz cut filter 27, 28
The function of is set to disabled.

In this standby state, the control unit 3 controls the line L1 by the ringing signal detection unit 31 in the network control unit 2,
Whether or not there is an incoming call is determined by checking the detection of the ringing signal from L2 (step S1). When there is an incoming call, it is checked whether the mode selection is fax mode (facsimile mode) (step S).
2).

When the fax mode is selected as the mode selection, the control section 3 starts the receiving process based on the fax mode and performs the ordinary facsimile receiving process.
The filter valid / invalid switching process ends (step S
3).

When the fax mode is not selected in step S2, the control unit 3 monitors whether the extension telephone set 26 or the external telephone set 41 is off-hook or whether the ringing signal continues (steps S4 and S4).
5) If the ringing signal detection unit 31 no longer detects the ringing signal in step S5 without performing the off-hook operation on the extension telephone 26 or the external telephone 41, it is determined that the other party disconnects the lines L1 and L2. Then, the process is finished as it is, and the process returns to the standby state.

When the extension telephone set 26 or the external telephone set 41 is off-hook in step S4, the control section 3 starts the CNG signal detection processing by the tone detection section 30 (step S6), and the telephone mode is selected as the mode selection. Whether or not there is checked (step S7).

When the telephone mode is selected in step S7, that is, when the CNG signal from the transmitting side is detected, it is not necessary to perform the automatic switching operation for connecting the lines L1 and L2 to the facsimile device 2 side. Is the control unit 3
With the functions of the 00 Hz cut filters 27 and 28 disabled, the process proceeds to step S9.

When the telephone mode is not selected in step S7, the 1100 Hz cut filter 27, 2
The function of 8 is enabled (turned on) (step S8), and it is confirmed whether or not the CNG signal is detected by the tone detector 30 (step S9). The tone detector 30 checks whether or not the CNG signal is detected (step S9).

When the CNG signal is detected in step S9, the control unit 3 determines that the facsimile communication is performed,
The facsimile reception process is started, the normal facsimile reception process is performed, and the filter valid / invalid switching process is ended (step S10).

If the CNG signal is not detected by the tone detector 30 in step S9, the controller 3 determines that the line L
While maintaining the state where 1 and L2 are connected to the extension telephone set 26 or the external telephone set 41, a telephone call by the extension telephone set 26 or the external telephone set 41 is ensured, and the extension telephone set 26 or the external attachment set by the 1100 Hz cut filter 27 or 1100 Hz cut filter 28 While cutting the 1100 Hz signal component input from the telephone 41, it is checked whether the tone detection unit 30 detects a CNG signal and whether the extension telephone 26 or the external telephone 41 is on-hook (step S9, S11).

Therefore, a signal component having the same frequency (1100 Hz) as the CNG signal input from the microphone of the extension telephone set 26 or the external telephone set 41 during a call using the extension telephone set 26 or the external telephone set 41. CNG is cut by the tone detection unit 30 with
While checking whether or not to detect a signal, a call can be made, a CNG signal can be reliably detected, and in a call using the extension telephone set 26 or the external telephone set 41, a call sound and surrounding environment can be obtained. C out of the sound
The tone detection unit 3 outputs a sound signal having the same frequency as the NG signal.
It is possible to prevent erroneous detection that 0 is a CNG signal, and it is possible to appropriately switch between facsimile communication and telephone calls by the telephones 26 and 41. As a result, it is possible to prevent accidental switching to facsimile communication during a call using the extension telephone set 26 or the external telephone set 41, and it is possible to make an appropriate call.

After that, without detecting the CNG signal,
When the extension telephone set 26 or the external telephone set 41 is hooked on in step S11, the control unit 3 causes the lines L1, L
When it is determined that No. 2 has been disconnected, the process for terminating the filter valid / invalid switching process is terminated.

Next, the filter valid / invalid switching process for controlling the valid / invalid of the 1100 Hz cut filters 27, 28 based on the filter valid / invalid setting state of the operation display unit 4 shown in FIG. 4 will be described below. .

In the description of FIG. 4, the same process numbers as those in FIG. 3 are designated by the same step numbers, and the detailed description thereof will be omitted.

In the same manner as described above, the facsimile apparatus 1 connects the lines L1 and L2 to the external telephone 41 side by the relay 23 in the standby state, and disables the functions of the 1100 Hz cut filters 27 and 28. In this standby state, the control unit 3 checks whether there is an incoming call (step S1), and if there is an incoming call, checks whether the mode selection is the fax mode (step S2).

When the fax mode is selected as the mode selection in step S2, the control section 3 carries out a normal facsimile reception process and ends the filter valid / invalid switching process (step S3) to enter the fax mode. When it is not selected, it is monitored whether the extension telephone set 26 or the external telephone set 41 is off-hook or the ringing signal continues (steps S4 and S5).

The control unit 3 controls the extension telephone 26 or the external telephone 41 while the off-hook operation is not performed.
When the ringing signal detection unit 31 no longer detects the ringing signal in step S5, the process is terminated as it is,
When the extension telephone 26 or the external telephone 41 is off-hook in step S4 after returning to the standby state, the CNG signal detection processing by the tone detector 30 is started (step S4).
6) It is checked whether or not the 1100 Hz cut filters 27 and 28 are set to ON (valid) (step S20).

When the function selection of the 1100 Hz cut filters 27 and 28 is set to ON (valid) in step S20, the control section 3 sets the 1100 Hz cut filters 27 and 28 to ON (valid) (step S20).
8) The tone detector 30 checks whether a CNG signal is detected (step S9).

When the function selection of the 1100 Hz cut filters 27 and 28 is set to OFF (disabled) in step S20, the control section 3 keeps the function of the 1100 Hz cut filters 27 and 28 disabled and continues to step S9.
Then, it is confirmed whether or not the CNG signal is detected by the tone detector 30 (step S9).

Thereafter, in the same manner as described above, in step S9, CN
When the G signal is detected, the control unit 3 determines that the communication is facsimile communication, starts the facsimile reception process, performs the normal facsimile reception process, and ends the filter valid / invalid switching process (step S10).

If the CNG signal is not detected by the tone detector 30 in step S9, the controller 3 determines that the line L
1100 Hz cut filter 27 or 1100 Hz cut filter 28 while ensuring a call by the extension telephone 26 or the external telephone 41 while keeping 1, L2 connected to the extension telephone 26 or the external telephone 41.
Then, it is checked whether the tone detector 30 detects a CNG signal while cutting the signal component of 1100 Hz input from the extension telephone set 26 or the external telephone set 41, and the extension telephone set 26 or the external telephone set 41 is hooked on. It is monitored (steps S9 and S11).

After that, without detecting the CNG signal,
When the extension telephone set 26 or the external telephone set 41 is hooked on in step S11, the control unit 3 causes the lines L1, L
When it is determined that No. 2 has been disconnected, the process for terminating the filter valid / invalid switching process is terminated.

Therefore, 1100 Hz is set to be valid / invalid according to the setting contents of the operation display unit 4, and the extension telephone set 26 or the outside telephone set 41 is used while the extension telephone set 26 or the outside telephone set 41 is used for a call. The same frequency as the CNG signal input from the microphone of the additional telephone 41 (110
With the signal component of 0 Hz) being cut, it is possible to make a call while checking whether or not the CNG signal is detected by the tone detection unit 30, it is possible to reliably detect the CNG signal, and the extension telephone 26 Alternatively, in a call using the external telephone 41, it is possible to prevent the tone detection unit 30 from erroneously detecting a signal having a frequency similar to that of the CNG signal among the call sound and the surrounding environmental sound as the CNG signal. Therefore, the facsimile communication and the telephone call by the telephones 26 and 41 can be appropriately switched.

As a result, it is possible to prevent accidental switching to facsimile communication during a call using the extension telephone set 26 or the external telephone set 41, and it is possible to make an appropriate call.

Although the invention made by the inventor has been specifically described based on the preferred embodiments, the invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

For example, in the above-described embodiment, the case where the present invention is applied to the facsimile machine having both the extension telephone and the external telephone is explained, but the same applies to the facsimile machine having at least one of them. it can.

In the above embodiment, CNG is used.
It is applied when switching between facsimile communication and telephone call by a signal, and 1100 Hz, which is a signal similar to the CNG signal, is cut off as a signal blocking means 1100.
Although the cut filters 27 and 28 are provided, the signal cutoff unit is not limited to the 1100 cut filter, and may cut not only the signal of 1100 Hz but also the signal of the frequency around it. And C
When switching between facsimile communication and telephone communication by a signal other than the NG signal, a signal having the same frequency as the frequency of the signal is cut.

[0073]

According to the first aspect of the present invention, a tone signal is a signal having the same frequency as a signal (for example, a CNG signal) for automatic switching included in a call voice or ambient environmental sound during a telephone call. It is possible to prevent erroneous detection as a signal for automatic switching by the detection means, and it is possible to prevent the call from being interrupted.

According to the second aspect of the present invention, when a telephone call is made in the telephone mode, that is, when automatic switching is not necessary, the sound quality of the telephone call sound made by the telephone by the signal blocking means. Can be prevented, and conversation can be conducted with good sound quality.

According to the third aspect of the present invention, the signal cutoff function of the signal cutoff means can be set to valid / invalid according to the setting of the setting means, and a call can be made while ensuring an appropriate automatic line switching operation. The sound quality of voice can be improved.

According to the invention described in claim 4, even when the external telephone is used, an appropriate line automatic switching operation can be ensured and an appropriate call can be made. The sound quality of can be improved.

According to the fifth aspect of the present invention, even when the built-in telephone is used, an appropriate automatic line switching operation can be ensured to make an appropriate call, and the call voice can be changed. The sound quality can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a facsimile apparatus of an embodiment to which a facsimile apparatus of the present invention is applied.

FIG. 2 is a circuit block diagram in the network control unit of FIG.

FIG. 3 is a flowchart of filter valid / invalid switching processing based on mode setting by the facsimile apparatus according to the present embodiment.

FIG. 4 is a diagram showing the validity / effectiveness of the facsimile apparatus according to the present embodiment.
The flowchart of the filter valid / invalid switching process based on the invalid setting state.

[Explanation of symbols]

 1 Facsimile device 2 Network control unit 3 Control unit 4 Operation unit 5 Plotter 6 Scanner 7 Display unit 8 Bus 21 DC detection unit 22 Hook switch 23 Relay 24 Transformer 25 Modem 26 Built-in telephone 27, 28 1100Hz cut filter 29 High impedance transformer 30 Tones Detector 31 Ringing signal detector 41 External telephone

Claims (5)

[Claims] 1. Facsimile communication means for performing facsimile communication with a facsimile machine of a partner connected by a line, a telephone for making a voice call with the partner via the line, and a partner via the line when receiving a call. Tone signal detecting means for detecting a tone signal sent from the telephone, line switching means for selectively connecting the line to the facsimile communication means and the telephone, and off-hook detecting means for detecting an off-hook state of the telephone. After the off-hook detection means detects that the telephone is off-hook while the line is connected to the telephone by the line switching means, the tone detection means detects a predetermined tone signal from the line. When the line is detected, the line switching unit switches the line from the telephone to the facsimile communication unit to connect the line. In a facsimile apparatus including control means for performing facsimile reception, signal cutoff means for cutting off at least a signal having the same frequency as the predetermined tone signal is provided between the telephone and the tone signal detection means. A facsimile machine characterized by. 2. The facsimile apparatus further comprises mode selecting means for selectively selecting a facsimile communication mode for giving priority to facsimile communication and a telephone mode for giving priority to a telephone call by the telephone, and the signal cut-off means comprises: It is possible to control the enable / disable of a signal blocking function for blocking a signal having the same frequency as the predetermined tone signal by the control means, and the control means, when the telephone mode is selected by the mode selection means, 2. The facsimile apparatus according to claim 1, wherein the signal blocking function of the signal blocking means is set to be invalid. 3. The facsimile apparatus further comprises setting means for setting enable / disable of a signal blocking function for blocking a signal having the same frequency as the predetermined tone signal, the signal blocking means being controlled by the control means. It is possible to control the validity / invalidity of a signal blocking function for blocking a signal having the same frequency as the predetermined tone signal, and the control means is configured such that the setting means disables the signal blocking function of the signal blocking means. 3. The facsimile apparatus according to claim 1 or 2, characterized in that the signal blocking function of the signal blocking means is set to be invalid. 4. The facsimile apparatus according to claim 1, wherein the telephone is an external telephone connected via a predetermined connecting portion. 5. The facsimile apparatus according to claim 1, wherein the telephone is a built-in telephone built in the facsimile apparatus.