JP3489256B2 - 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 machine.

[0002]

2. Description of the Related Art In recent years, the number of communication devices equipped with a microcomputer has increased, and among them, in a facsimile machine, a CPU (Central Processing Unit: Central Processing Unit) of a microcomputer that controls a facsimile unit is used.
t) performs compression / decompression processing of image data, so this C
It is necessary to use a PU that has a fast processing operation, that is, one that has a high operation clock.

When the operation clock is high, noise is inevitably generated, and even if the facsimile unit is not transmitting or receiving image data, only the CPU is still operating, so that the CPU itself operates from the facsimile unit. Inevitably becomes a source of noise.

By the way, some facsimile machines have a cordless telephone function for making a wireless call with a slave in addition to the original facsimile function. For this cordless telephone function, a handset equipped with a high-frequency unit that enables wireless voice communication is prepared, and a high-frequency unit that enables wireless voice communication is also provided in the facsimile device body connected to the telephone line. Equipped.

In general, the frequency band used for cordless telephones varies from country to country, for example, 400 MHz in Japan but 46 to 49 MHz in the United States. Of these, the frequency band of 46 to 49 MHz is particularly vulnerable to noise generated by the facsimile mechanism, especially the modem, so
If a facsimile is received during a cordless extension call using the frequency band of 49 MHz, noise may be mixed in the call and the user may feel uncomfortable.

Further, the facsimile apparatus main body is provided with a voice circuit for enabling a voice call and a speakerphone function which enables a handset to talk without releasing the handset or the handset.
There is also a structure in which it is possible to make a cordless extension call between the main body of the facsimile device and the cordless handset. With such a configuration, cordless extension communication is performed separately from the outside line. Therefore, it is conceivable that the facsimile unit can be connected to an outside line, and when the facsimile arrives, the receiving operation of the facsimile is started even during the extension call.
However, there is a problem that if the facsimile communication is performed during the extension call by the cordless communication, noise is generated in the facsimile unit and the extension call is disturbed.

On the other hand, in the conventional facsimile apparatus disclosed in Japanese Laid-Open Patent Publication No. 4-167750, for example, a facsimile section for automatically or manually transmitting / receiving a facsimile and a cordless telephone section for making a cordless call. In the case where a facsimile is received during a cordless extension call, the operation of the facsimile section is stopped during the extension call, and the terminal is released after the extension call to receive the facsimile. There is.

[0008]

However, even if an attempt is made to achieve the above object in a facsimile apparatus using a microcomputer, a common control can be achieved by using a microcomputer common to the facsimile section and the cordless telephone section. The means, the microcomputer, cannot be turned off.

It is possible to turn off the power of the facsimile unit as means for stopping the operation of the facsimile unit by using a dedicated microcomputer for the facsimile unit. However, when the power is turned off, the operation of the facsimile unit is controlled. Since all the data stored in the computer will be lost, it is not realistic to turn off the power.

Further, as a means for stopping the operation of the facsimile section, it may be possible to employ a means for preventing data from entering the facsimile section.

Further, generally, the cordless telephone section is constructed so as to check the electric field strength of the call channel before starting the call, and not make a call if the electric field strength of the call channel exceeds a predetermined value. So in this case,
The call channel is regarded as being used by another terminal, and the call is not started in order not to interfere with the other terminal. Therefore, if the noise generated by the CPU of the facsimile unit affects the electric field strength of the communication channel,
Even if the noise is at a level that does not interfere with hearing the voice of the other party, the call may not be started if the electric field strength exceeds a predetermined value.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a facsimile apparatus in which noise is prevented from being generated from a facsimile section.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and C which controls the facsimile section is described.
As a PU (Central Processing Unit), a CPU for both operating and non-operating modes is provided, and a control means for controlling the CPU to be in the non-operating mode except during the facsimile operation is provided.

[0014]

With this configuration, the facsimile unit operates in the sleep mode in which the CPU of the facsimile unit is in the non-operation mode, that is, the clock frequency is lowered except when the facsimile unit is in operation, or when the clock frequency is kept as it is or the clock signal itself is stopped. Since the halt mode is set to stop the operation of the CPU of the facsimile section substantially, when the cordless call is made except when the facsimile section is operating, the noise source C of the facsimile section is generated.
Noise generation from the PU itself is virtually eliminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, an outline of the present invention will be described, and then a detailed description will be given.

FIG. 1 is a block diagram showing the configuration of the main part of a facsimile apparatus according to an embodiment of the present invention. In FIG. 1, the facsimile apparatus comprises a control unit 1, a facsimile unit 2 and a cordless telephone unit 3.

First, the configuration of the control unit 1 will be described. Reference numeral 7 is an interface unit that enables connection to a telephone line. Reference numeral 4 is a ring signal detector, which detects a ring signal coming from the telephone line 5 and makes a ring sound,
It also outputs a detection signal indicating the arrival of the ring signal to the main CPU 6. In addition, 5 is a telephone line.

Reference numeral 6 is a main CP for controlling the operation of the control unit 1.
U. The main CPU 6 also controls switching between an operation mode and a non-operation mode of a slave CPU of the facsimile unit 2 described later. 7 is an interface section,
The telephone line 5 is closed based on the control signal sent from the main CPU 6. Reference numeral 8 denotes a CNG signal detection unit as an example of a facsimile communication start signal detection unit, which receives a CNG signal (a facsimile communication start signal is a CNG signal in the G3 standard but is different in the G4 standard) from the telephone line 5. When it comes, this is detected and output to the main CPU 6.

Reference numeral 9 is a communication mode switching means, which switches between the facsimile mode and the telephone mode under the control of the main CPU 6. Reference numeral 10 denotes a line switch, which is controlled by the main CPU 6 to be shut off in the on-hook state and closed in the off-hook state. Line switch 10
Can be switched between closed and closed depending on, for example, the hook state of the cordless telephone unit 3.

Reference numeral 11 denotes an operation unit, which is composed of keys for dialing and an LCD (liquid crystal display).
The user uses the operation unit 11 to perform a cordless extension call or an extension call, an operation to set transmission of a facsimile signal, an operation to send a dial number, and an interrupt transmission operation for urgent facsimile transmission. Can be done. 12 is a dial signal transmitting section,
When dialed from the operation unit 11, a dial signal is transmitted to the telephone line 5 via the interface unit 7.

Next, the structure of the facsimile section 2 will be described. Reference numeral 13 denotes a CPU capable of switching between an operation mode and a non-operation mode, and controls the facsimile section 2. Since this CPU operates under the control of the above-mentioned main CPU 6, it will be referred to as a slave CPU 13 hereinafter. Slave CPU
As 13 is used, for example, a 16-bit high-speed processing clock having a high processing speed, and in the operation mode, it is operated at this high clock to compress / decompress image data. Further, the slave CPU 13 is switched to the operation mode or the non-operation mode under the control of the main CPU 6, and in the non-operation mode, power saving is performed to prevent the generation of noise. The non-operation mode includes a sleep mode and a halt mode, which will be described later. Here, a sleep mode in which the operation of the CPU is substantially stopped by lowering the clock frequency will be described as an example.

FIG. 8 shows a sleep controller and a clock signal generator in the slave CPU 13. In FIG.
13a is a sleep control unit. In the clock signal generator, 13b is a first oscillator circuit (OSC), 13c is a second oscillator circuit (OSC), 13d is a crystal oscillator for the first oscillator circuit 13b, and 13e is a second oscillator circuit 13c. Crystal oscillator, 13f is clock frequency changeover switch,
13g is a clock signal circuit.

The control signal from the main CPU 6 is applied to the sleep controller 13a which controls the sleep mode of the slave CPU 13. When the sleep control unit 13a receives the control signal from the main CPU 6, the slave CPU 13a
At the same time as activating either the first oscillating circuit 13b or the second oscillating circuit 13c of the clock signal generator in 13, the clock frequency changeover switch 13f is switched according to the control signal, and either one of the signals is sent to the clock signal circuit 13g. To supply.

For example, a crystal oscillator having a frequency of 4 MHz is used as the crystal oscillator 13d and a crystal oscillator having a frequency of 32 KHz is used as the crystal oscillator 13e. In normal operation, the first oscillator circuit 13b operates with a clock signal of 4 MHz. When the sleep mode is controlled by the control signal from the main CPU 6 described above, the second oscillator circuit 13c becomes active, the crystal oscillator 13e causes the second oscillator circuit 13c to oscillate at 32 KHz, and the clock frequency changeover switch 13f is turned on. A 32 KHz clock signal is applied to the clock signal circuit 13g via the clock signal circuit 13g. This means that the clock frequency for operating the slave CPU 13 has been switched from 4 MHz to 32 KHz.

In the facsimile unit 2, a voice synthesis LSI 14 reproduces a voice signal corresponding to a response message recorded as digital data and outputs it as audible voice. A modem 15 modulates an image signal to be transmitted so that the image signal can be transmitted through a telephone line, and demodulates an image signal from a signal received through the telephone line 5. 16
Is a printer that receives an image signal output from the modem 15 and prints the image. Reference numeral 17 is a scanner that reads a document to be transmitted and outputs it to the modem 15.
Of the above-mentioned devices that constitute the facsimile unit 2, the clocks of the slave CPU 13, the voice synthesis LSI 14, the modem 15 and the like are sources of noise.

Next, the configuration of the cordless telephone section 3 will be described. Reference numeral 18 denotes a CPU that controls the cordless telephone unit 3, and since this CPU also operates under the control of the above-mentioned main CPU 6, it will be referred to as a slave CPU 18 hereinafter. Reference numeral 19 denotes a modem, which is responsible for the overall modem function of the cordless telephone unit 3. Reference numeral 21 is a low frequency circuit (AF) that amplifies a voice band signal to be transmitted. Reference numeral 22 denotes a radio frequency unit (RF) including a radio receiving circuit and a radio transmitting circuit, which converts a radio frequency signal sent from the slave unit 20 and received by the antenna 23 into a voice band signal, or a voice band signal to be transmitted. Converted to a high-frequency signal, the slave unit 2 via the antenna 23
Send to 0.

Reference numeral 24 is a speakerphone circuit (SP circuit) having a speakerphone function. Reference numeral 25 is a monitor section that outputs aloud sound so that the sound can be heard even from a distant position.
Reference numeral 26 is a transmitter for converting a voice input by the user into a voice signal, which is connected to the speakerphone circuit 24. In this manner, the main body of the facsimile device is provided with a speakerphone function which enables a voice call, and the extension phone call is cordlessly made between the main body of the facsimile device and the handset 20.

The handset 20 is provided with a transmitter, a receiver, a voice amplifier circuit, a radio receiving circuit and a radio transmitting circuit.

Further, in this embodiment, the main CPU 6
Although the cordless telephone unit 3 is controlled under the control of 1., the slave CPU 18 may be eliminated and the main CPU 6 may directly control the cordless telephone unit 3.

The operation of the facsimile apparatus configured as described above will be described with reference to the flowcharts of FIGS. 2 to 7 showing the operation of the facsimile apparatus according to the embodiment of the present invention.

(Operation Example 1) A common reception operation of facsimile / cordless call (set to give priority to facsimile) will be described with reference to FIGS.

Since the priority is given to the facsimile, the communication mode switching means 9 is set to the facsimile mode in advance,
The voice signal path is connected to the facsimile unit 2. Also, a slave CPU that is responsible for overall control of the facsimile unit 2.
Reference numeral 13 is in a sleep mode when the facsimile section 2 is inactive.

When there is an incoming call and a ring signal comes in from the telephone line 5, the ring signal detecting section 4 detects it and emits a ring sound, and outputs a detection signal indicating the arrival of the ring signal to the main CPU.
Output to 6 (step 1). When the ring signal arrives a predetermined number of times (step 2), the main CPU 6 sends a control signal to the interface section 7 to close the telephone line 5 (step 3).

After this, the CNG signal detection unit 8 is CNG.
It branches depending on whether or not a signal is detected (step 4). That is, when the CNG signal is detected, the main CPU 6 recognizes the facsimile communication and proceeds to the facsimile mode (step 5). If the CNG signal is not detected in step 4, it is recognized that the communication is not facsimile communication and the telephone mode is entered.

When the facsimile mode is entered, the main CP
U6 sends a control signal indicating non-operation to the slave CPU 18 of the cordless telephone section 3 to put the cordless telephone section 3 into the non-operation state (step 6).

Next, the main CPU 6 controls the facsimile section 2
A control signal indicating the start of operation is sent to the slave CPU 13 to cancel the sleep mode of the slave CPU 13 and switch to the operation mode. Therefore, the facsimile unit 2 starts the communication operation and receives the facsimile signal (step 7).

When the reception of the facsimile signal is completed (step 8), the slave CPU 13 notifies the main CPU 6 of the control unit 1 to that effect, and then switches itself from the operation mode to the sleep mode according to an instruction from the main CPU 6, and the facsimile unit 2 The operation of is substantially stopped (step 9). The main CPU 6 is the cordless telephone unit 3
The control signal of the slave CPU 18 is sent to release the operation stop of the cordless telephone section 3 (step 10), and the interface section 7 is controlled to open the telephone line 5.

When the cordless telephone section 3 is put into the non-operating state in step 6, even if the user operates the cordless extension telephone call during the non-operating state, the operation is not accepted.

When the CNG signal is not detected in step 4 and the telephone mode is entered, the main CPU 6 sends a control signal to the communication mode switching means 9 to connect the voice signal path to the cordless telephone part 3 for communication. The mode is switched to the telephone mode (step 11). The slave CPU 18, which is responsible for overall control of the cordless telephone unit 3, has a modem 19 and an RF.
A control signal is sent to the circuit 22 (high frequency circuit) to measure the electric field strength of the channel in which a call is to be made (step 1).
2). If the electric field strength is equal to or lower than a predetermined value, it is considered that the channel is idle, and a calling signal is transmitted to the handset 20 on the channel (step 13). When the handset 20 goes off-hook, the call operation is started. Yes (Step 1
4).

At this time, the facsimile section 2 is substantially in a stopped state, and the slave CPU of the facsimile section 2
13 is in the sleep mode and drastically reduces its own operation clock to the limit. For example, in operation mode 4
A high clock of MHz changes to a low clock of 32 KHz when switching to the sleep mode.

As described above, only the slave CPU 13 is operating in the sleep mode among the devices constituting the facsimile unit 2. However, since this is a state of holding a breath, the noise generated by the slave CPU 13 is extremely small. Therefore, when measuring the electric field strength for channel selection after switching to the telephone mode, it is possible to search for a vacant channel almost without being affected by noise. Further, since the noise generated by the facsimile unit 2 is substantially negligible, the cordless call is performed with clear sound quality that is not affected by the noise at all.

When the slave CPU 13 is in the sleep mode, the facsimile operation is substantially stopped, but since the power is not turned off, the data concerning the facsimile communication given up to that time remains in the CPU, and after the cordless call ends. The facsimile operation can be resumed immediately.

When the call ends (step 15), the slave CPU 18 notifies the main CPU 6 of the control unit 1 (step 16). The main CPU 6 which has been notified of the end of the call sends a control signal to the communication mode switching means 9 to connect the voice signal path to the facsimile section 2 again to switch to the facsimile mode (step 17). Then, the interface section 7 is controlled to open the telephone line 5 (step 18).

(Operation Example 2) Next, a case where cordless extension communication is performed between the main body of the facsimile machine and the slave unit 20 will be described with reference to FIGS. When the facsimile unit 2 is not in operation, that is, when the slave CPU 13 is in the sleep mode, when the user performs an operation for making a cordless extension call, the communication mode switching means 9 connects the voice signal path to the cordless telephone unit 3 according to the operation. Then, the communication mode is switched to the telephone mode.

When an incoming call is received during an extension call and a ring signal comes in from the telephone line 5, the ring signal detector 4
Detected by the main CP.
Output to U6 (step 19). When the ring signal arrives a predetermined number of times (step 20), the main CPU 6 sends a control signal to the interface section 7 to close the telephone line 5 (step 21).

When the CNG signal detector 8 detects the CNG signal from the other party's facsimile terminal (step 2)
2) Although the main CPU 6 recognizes the facsimile communication, the slave CPU 13 is kept in the sleep mode until the cordless extension call is completed, and the operation stop state of the facsimile unit 2 is not released. When the extension call ends (step 23), the slave CPU 18 notifies the main CPU 6 of this (step 24). Specifically, when the call ends and the user performs an on-hook operation on the child device 20, the slave CPU 18 transmits a signal to that effect, that is, an extension call end detection signal to the main CPU 6. According to the extension call end detection signal, the main CPU 6 immediately sends a control signal to the communication mode switching means 9 to connect the voice signal path to the facsimile section 2 again to switch to the facsimile mode (step 25), and the cordless telephone section 3 Is set in the non-operating state (step 26), the sleep mode of the slave CPU 13 is released, and the operating mode is set.

Then, if the telephone line has not been disconnected, a signal responding to the CNG signal is sent to the facsimile terminal of the other party in accordance with a command from the main CPU 6 to start the operation of facsimile reception (step 2).
7). When the reception of the facsimile signal is completed (step 28), the slave CPU 13 switches from the operation mode to the sleep mode again by the instruction of the main CPU 6 and substantially stops the operation of the facsimile section 2 (step 2).
9). Then, the operation stop of the cordless telephone section 3 is released (step 30), and the interface section 7 is controlled to open the telephone line 5 (step 31).

(Operation Example 3) A facsimile transmission operation will be described with reference to FIGS.

When the user operates the operation unit 11 to set the transmission of the facsimile signal (step 32), the control unit 1
Main CPU 6 is a slave CP of the cordless telephone unit 3.
By grasping the operation state of U18, it is judged whether or not a cordless call operation is in progress (step 33).

If the cordless telephone unit 3 is in a call operation, the main CPU 6 displays on the LCD of the operation unit 11 that the call is in progress, and the slave of the facsimile unit 2 is used until the call of the cordless telephone unit 3 is completed. The CPU 13 does not cancel the sleep mode of the CPU 13 and prohibits the transmission of facsimile signals (step 34).

If the cordless telephone unit 3 is not in a call operation, the main CPU 6 immediately sends a control signal to the slave CPU 18 to inhibit the operation of the cordless telephone unit 3 (step 35), and sends a control signal to the slave CPU 13. Then, the sleep mode is released to switch to the operation mode and the facsimile signal is transmitted (step 36). If the setting of the facsimile transmission is canceled by the user's operation or time-out without the call operation of the cordless telephone unit 3 being completed, the facsimile transmission operation is ended without performing the facsimile transmission operation.

When the transmission of the facsimile signal is completed, a signal indicating the completion of the transmission is transmitted from the slave CPU 13 to the main CPU 6. Main CPU 6 is slave CPU 13
When the transmission end signal from the slave C is received, it recognizes that the transmission is completed (step 37), and the slave C follows this signal.
The PU 13 is switched from the operation mode to the sleep mode (step 38), and a control signal is sent to the slave CPU 18 to release the operation inhibition of the cordless telephone section 3 (step 39). Then open the telephone line (step 4)
0).

(Operation Example 4) Next, an example in which a facsimile operation is enabled during a cordless call operation will be described with reference to FIGS. In this example, a means for issuing an interrupt instruction to urgently perform a facsimile operation is provided, and for example, when the interrupt instruction is issued by the user during the cordless extension call operation, the CPU of the facsimile unit 2 is immediately changed from the non-operation mode. The facsimile operation is made possible by switching to the operation mode.

Normally, if the cordless telephone section 3 is in a call operation, the operation is prohibited even if facsimile transmission is set. That is, when the user operates the operation unit 11 to set the facsimile transmission (step 41), the main CPU 6 of the control unit 1 becomes the slave CPU 1 of the cordless telephone unit 3.
If the cordless telephone unit 3 is in a call operation (step 33), the main CPU 6 displays on the LCD of the operation unit 11 that the call is in progress, as in the case of the operation example 3 described above. The slave CPU of the facsimile unit 2
The sleep mode of 13 is not released, and the transmission of facsimile signals is prohibited (step 44).

In the next step 45, the cordless telephone unit 3
It is determined whether the call operation of is for an extension call. If the call operation is not an extension call but a call to an outside line, for example, the process returns to step 42. If it is determined in step 45 that the call operation is for an extension call, the next step 46 detects whether or not there is a facsimile interrupt transmission instruction from the user.

If the user urgently wants to perform facsimile transmission and gives an instruction for interrupt transmission, the process proceeds to step 36, and the facsimile transmission operation is started in the same manner as in the operation example 3 described above. In this case, the noise generated by the slave CPU 13 causes noise noise to be mixed into the communication voice, but this state is not a big problem since the channel is established and the wireless link is established. If there is no instruction for interrupt transmission, the process returns to step 42 and the sleep mode of the slave CPU 13 of the facsimile unit 2 is not released until the call operation of the cordless telephone unit 3 is completed.

At step 42, if the cordless telephone section 3 is not in a call operation, the main CPU 6 makes the slave CP
A control signal is sent to U18 to prohibit the operation of the cordless telephone section 3 (step 43), and the facsimile transmission operation is started. After that, the processes relating to the facsimile transmission operation from step 36 to step 40 are the same as in the case of the operation example 3 described above, and therefore the description thereof will be omitted.

If the setting of the facsimile transmission is canceled by the user's operation or time-out without the call operation of the cordless telephone section 3 being completed, the facsimile transmission operation is ended without performing the facsimile transmission operation.

(Operation Example 5) An operation during a cordless outside line call will be described with reference to FIGS.

For example, when a user carrying the child device 20 makes a call, when the user performs an off-hook operation on the child device 20 (step 51), a signal to that effect is sent wirelessly by the cordless telephone unit 3 The slave CPU 18 identifies the request as a cordless outside line call. Slave C
The PU 18 sends a signal to the main CPU 6 to notify the start of cordless outside line communication (step 52).

In response to this, the main CPU 6 sends a control signal to the communication mode switching means 9, switches the communication mode to the telephone mode, and closes the line switch 10 (off-hook state) (step 53). The main CPU 6 sends a control signal to the dial signal transmission unit 12, transmits the dial signal generated by the child device 20 to the telephone line 5 through the interface unit 7 and starts an outside line call (step 54).

Here, the facsimile section 2 is substantially in a stopped state, and the slave CPU 13 which is responsible for the overall control of the facsimile section 2 is in the sleep mode when the facsimile section 2 is inactive, and the operation clock of itself is drastically increased to the limit. Is decreasing. For example, in the operation mode, the high clock of 4MHz is 32K when switched to the sleep mode.
Change to a low clock of Hz. Only the slave CPU 13 of the devices constituting the facsimile unit 2 is operating in the sleep mode, but the noise generated by the slave CPU 13 is extremely small because the device is in a breath-holding state. Eventually, the noise generated by the facsimile unit 2 becomes substantially negligible, and the cordless call is performed with clear sound quality that is not affected by the noise at all.

When the call ends and the user performs an on-hook operation on the child device 20, the slave CPU 18 sends a signal to that effect, that is, an extension call end detection signal to the main CPU 6 (step 55). The main CPU 6 which has been notified of the end of the call sends a control signal to the communication mode switching means 9 to switch to the facsimile mode again, shuts off the line switch 10 (on-hook state) (step 56), and controls the interface unit 7. The telephone line 5 is opened (step 57).

In the above example, the sleep mode has been described as an example of the non-operation mode of the slave CPU 13. However, the same effect can be obtained in the case of the halt mode as well. Switch to operating mode.

There are two kinds of halt modes, one is a mode in which the clock signal is not stopped and is continuously supplied to the CPU at the basic frequency, but the CPU stops the execution of the program. The other is a mode in which the clock signal is completely stopped after the program execution is stopped.

In the halt mode when the clock does not stop, the clock frequency itself is high, but since the execution of the program is stopped, there is almost no signal processing inside the CPU and the noise generated by the CPU itself is extremely small. Become. Therefore, the halt mode has the same effect as the sleep mode from the viewpoint of noise suppression of the CPU.

[0067]

As described above, according to the present invention, a CPU for operating / non-operating mode is provided as a CPU for controlling the facsimile section, and the CPU is controlled so as to be in the non-operating mode except during the facsimile operation. With this configuration, the facsimile unit stops the execution of the program while the facsimile unit CPU is in a non-operation mode, that is, a sleep mode in which the clock frequency is lowered, or the clock frequency is kept as it is. Or, the halt mode for stopping the clock signal itself is set to substantially stop the operation of the CPU of the facsimile section. Therefore, when a cordless call is made except when the facsimile section is operating, noise is generated in the facsimile section. Noise generation from the source CPU itself is substantially eliminated.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing the operation of the facsimile apparatus according to the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the facsimile apparatus according to the embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the facsimile apparatus in the embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the facsimile apparatus in the embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the facsimile apparatus according to the embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the facsimile apparatus according to the embodiment of the present invention.

FIG. 8 is a block diagram showing a sleep control unit and a clock signal generation unit in a slave CPU of the facsimile apparatus in the embodiment.

[Explanation of symbols]

1 control unit 2 Facsimile department 3 cordless telephone department 4 Ring signal detector 6 main CPU 7 Interface section 8 CNG signal detector 9 Communication mode switching means 10 line switch 11 Operation part 13 Slave CPU 13a sleep control unit 13b First oscillator circuit 13c Second oscillator circuit 13f Clock frequency selector switch 14 Speech synthesis LSI 15 modem 16 Printer 17 Scanner 18 slave CPU 21 Low frequency circuit 22 High frequency part 20 cordless handsets 23 antenna 24 speakerphone circuit

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Claims (14)

(57) [Claims] 1. An interface unit for connecting to a telephone line, a facsimile communication start signal detection unit for detecting a facsimile communication start signal input via the interface unit, and a CPU for both operating and non-operating modes. A facsimile unit for performing facsimile communication with a telephone line via the interface unit; a cordless telephone unit having a wireless reception circuit and a wireless transmission circuit for cordless communication; and a CPU of the facsimile unit for facsimile operation. A facsimile machine having a control means for controlling the non-operation mode except at times. 2. When a facsimile arrives during a cordless call operation, the CPU of the facsimile section operates during the call operation.
C is maintained in the non-operation mode, and the C
2. The facsimile apparatus according to claim 1, further comprising control means for setting a PU to an operation mode and performing a facsimile reception operation. 3. A call end detection means for detecting that a user has ended a call, and when a facsimile arrives during a cordless call operation, the CPU of the facsimile section is kept in a non-operation mode during the call operation. 2. The facsimile apparatus according to claim 1, further comprising control means for setting the CPU in an operation mode and performing a facsimile reception operation in accordance with an end detection signal from the call end detection means. 4. A means for issuing an interrupt instruction to forcibly perform a facsimile operation, and when a user gives an interrupt instruction during a cordless call operation, the CPU of the facsimile unit is changed from the non-operation mode to the operation mode. 2. The facsimile apparatus according to claim 1, further comprising control means for switching to the above mode to enable a facsimile operation. 5. A means for issuing an interrupt instruction to forcibly carry out a facsimile operation, wherein even if an operation for making a facsimile call is performed by a user during a cordless call operation, the C of the facsimile section is operated.
Control means for maintaining the PU in the non-operation mode and switching the CPU of the facsimile unit from the non-operation mode to the operation mode when the user gives an interrupt instruction during the cordless call operation to enable the facsimile transmission operation. The facsimile apparatus according to claim 1, further comprising: 6. The facsimile apparatus according to claim 1, wherein the non-operation mode is a sleep mode in which the frequency of the operating clock of the CPU is drastically reduced. 7. The facsimile apparatus according to claim 1, wherein the non-operation mode is a halt mode for stopping the execution of the program of the CPU. 8. An interface unit for connecting to a telephone line, a facsimile communication start signal detection unit for detecting a facsimile communication start signal input via the interface unit, and a CPU for both operating and non-operating modes. A cordless telephone unit having a facsimile unit for carrying out facsimile communication with a telephone line via the interface unit, a cordless telephone unit having a wireless reception circuit and a wireless transmission circuit for cordless communication, and a cordless extension line between the cordless handset It has a voice call means for making a call and a communication mode switching means for switching between a facsimile mode and a telephone mode. Normally, the communication mode switching means is set to the facsimile mode and the CPU of the facsimile section is not operated. Mode and the fax operation is required. That the facsimile apparatus provided with a control means for controlling so that the CPU of the facsimile unit and the operation mode immediately. 9. A CPU of a facsimile unit during a call operation when a facsimile arrives during a cordless call operation.
C is maintained in the non-operation mode, and the C
9. The facsimile apparatus according to claim 8, further comprising control means for setting a PU to an operation mode and performing a facsimile reception operation. 10. A call termination detecting means for detecting that the user has terminated the call, and when a facsimile arrives during a cordless call operation, the CPU of the facsimile section is kept in a non-operation mode during the call operation. 9. The facsimile apparatus according to claim 8, further comprising control means for setting the CPU in an operation mode and performing a facsimile reception operation in accordance with an end detection signal from the call end detection means. 11. A means for issuing an interrupt instruction to forcibly carry out a facsimile operation, wherein the CPU of the facsimile unit is operated from a non-operation mode when the user issues an interrupt instruction during an extension telephone call operation by a cordless operation. 9. The facsimile apparatus according to claim 8, further comprising control means for switching to a mode and enabling a facsimile operation. 12. A means for issuing an interrupt instruction to forcibly carry out a facsimile operation, wherein the CPU of the facsimile section is not operated even if an operation of sending a facsimile is performed by a user during an extension telephone call operation by a cordless operation. A control means for maintaining the mode, and switching the CPU of the facsimile unit from the non-operation mode to the operation mode when the user gives an interrupt instruction during the extension call operation to enable the facsimile transmission operation. 8. The facsimile machine according to item 8. 13. The facsimile apparatus according to claim 8, wherein the non-operation mode is a sleep mode in which the frequency of the operation clock of the CPU is drastically reduced. 14. The facsimile apparatus according to claim 8, wherein the non-operation mode is a halt mode for stopping the execution of the program of the CPU.