JP5286093B2 - Information processing device - Google Patents

Description

  The present invention relates to an information processing apparatus that can reduce the influence of noise caused by static electricity and electromagnetic waves.

An information processing apparatus, for example, a facsimile apparatus, may malfunction due to the influence of noise caused by static electricity charged on an operator or a document to be transmitted, or electromagnetic waves from a transmission tower that transmits FM (Frequency Modulation) radio waves. . For example, LED (Light
The clock signal input to the drive circuit that drives the Emitting Diode) may malfunction due to the influence of noise, and the LED may not be displayed correctly.

  In the noise detection device described in Patent Document 1, when the processing status received from the external processor matches the processing status set in advance and the digital noise signal input from the A / D converter is equal to or greater than the set value, A reset signal is output to the processor.

  In the electronic camera described in Patent Document 2, the system clock generation circuit converts the frequency of the basic clock signal to x times or 1 / x times, and the system clock frequency can be switched stepwise. The CPU switches the system clock frequency according to the operation mode and power supply current, and also switches the current consumption according to the switching of the clock frequency, thereby preventing the occurrence of overshoot or undershoot due to the difference in current consumption. Prevents malfunction and image noise.

  The bias circuit described in Patent Document 3 is configured to input a second D-type flip-flop by inputting, to the first D-type flip-flop, a clock that is shifted by a half cycle from the clock input to the second D-type flip-flop. This is to avoid the influence on the first D-type flip-flop due to the spike noise caused by the change in the output voltage.

JP 2004-32170 A JP 2006-197322 A Japanese Utility Model Publication No. 5-20427

  However, the noise detection device described in Patent Document 1 outputs a reset signal when there is a digital noise signal that is equal to or greater than a set value in a predetermined processing status, but when the same noise occurs next, There is a problem that it is not affected by the same effect, and the resistance to the same noise cannot be increased.

  The electronic camera described in Patent Document 2 prevents overshoot or undershoot due to a difference in current consumption when switching the clock frequency. The bias circuit described in Patent Document 3 is In order to avoid the effects of spike noise caused by changes in the output voltage synchronized with the clock, both conventional techniques are effective against noise that occurs irregularly, for example, noise caused by static electricity or electromagnetic waves charged on people or documents. Therefore, there is a problem that the effect cannot be exhibited.

  An object of the present invention is to provide an information processing apparatus that can reduce storing wrong information even if a timing signal for storing information is affected by noise caused by static electricity or electromagnetic waves.

The present invention stores the first information and any one of the second information different from the first information, a storage unit for outputting the stored information,
A control unit that controls the storage unit by sending instruction information indicating either the first information or the second information and an instruction signal that instructs to store the instruction information to the storage unit;
A determination unit that determines whether the instruction information sent to the storage unit by the control unit and the storage information output by the storage unit match,
The storage unit stores the instruction information at the time when the instruction signal transmitted from the control unit changes from the first signal level to the second signal level among the instruction information transmitted from the control unit,
The control unit reverses the signal level of the instruction signal during a signal non-change period in which the signal level of the instruction signal is not changed when the determination unit determines that the instruction information and the stored information do not match. Information processing apparatus.

  According to the present invention, the storage unit stores any one of the first information and the second information different from the first information, and outputs the stored information. The storage unit is controlled by sending instruction information indicating one of the information of 1 and the second information and an instruction signal for instructing to store the instruction information to the storage unit. It is determined whether the instruction information sent from the storage unit to the storage unit matches the storage information output from the storage unit.

  The storage unit stores instruction information at the time when the instruction signal transmitted from the control unit changes from the first signal level to the second signal level among the instruction information transmitted from the control unit. When the determining unit determines that the instruction information and the stored information do not match, the signal level of the instruction signal in the signal non-change period in which the signal level of the instruction signal is not changed is inverted.

  For example, when the signal level of the instruction signal in the signal non-change period is the ground level and the instruction signal of the ground level fluctuates due to the influence of noise, the storage unit stores incorrect information, and the instruction information to be stored is May reverse. When the determination unit determines that the instruction information and the stored information do not match, the signal level of the instruction signal in the signal non-change period is inverted from the ground level to the level of the power supply voltage. Therefore, if the noise affects the ground side and does not affect the power supply side, the same noise is generated during the signal non-change period, and even if the instruction signal is affected, the signal level is not reversed. can do. That is, even if the instruction signal, that is, the timing signal for storing information is affected by noise due to static electricity or electromagnetic waves, the signal level can be prevented from reversing, and the storage of erroneous information can be reduced. it can.

1 is a block diagram illustrating a configuration of a facsimile machine 1 according to an embodiment of the present invention. 3 is a diagram illustrating a configuration of an operation panel unit 11. FIG. 3 is a time chart of signals sent from a control unit 10 to an operation panel unit 11. It is a figure which shows the example of the noise which affects a clock signal. It is a figure which shows an example of the circuit which switches the signal level of a clock signal. 5 is a diagram illustrating an example of a malfunction signal level storage table 30. FIG. It is a flowchart which shows the malfunction prevention process which the control part 10 and the malfunction monitoring part 12 perform. 4 is a flowchart showing an operation mode switching process executed by the control unit 10.

FIG. 1 is a block diagram showing a configuration of a facsimile machine 1 according to an embodiment of the present invention. The facsimile apparatus 1 as an information processing apparatus includes a control unit 10, an operation panel unit 11, a malfunction monitoring unit 12, a display unit 13, a reading unit 14, a printing unit 15, a network control unit 16, a DSP (Digital).
A signal processor unit 17, a radio unit 18, an external I / F (interface) unit 19, a data bus 20, and a connection cable 21 are included.

  The control unit 10 includes a central processing unit (hereinafter referred to as “CPU”) and a storage device. The CPU executes a control program stored in a storage device such as a semiconductor memory, whereby an operation panel unit 11, a malfunction monitoring unit 12, a display unit 13, a reading unit 14, a printing unit 15, a network control unit 16, and a DSP unit. 17, controls the wireless unit 18 and the external I / F unit 19. The data bus 20 is used to transmit data between the control unit 10, the malfunction monitoring unit 12, the display unit 13, the reading unit 14, the printing unit 15, the network control unit 16, the DSP unit 17, the wireless unit 18, and the external I / F unit 19. This is a data transfer path that enables transmission and reception. The connection cable 21 is a cable that connects the control unit 10 and the operation panel unit 11, and includes a signal line for transmitting and receiving information between the control unit 10 and the operation panel unit 11.

  The operation panel unit 11 includes a key operation unit including a plurality of keys for inputting information and a light emitting unit such as an LED (Light Emitting Diode) for displaying information, and is connected to the control unit 10 by a connection cable 21. Is done. The operation panel unit 11 sends information input from the key operation unit to the control unit 10 and displays information received from the control unit 10 on the LEDs. The operation panel unit 11 is a user interface between the person and the facsimile apparatus 1, and unlike other parts such as the control unit 10, the operation panel unit 11 is disposed at a position where a person can easily operate, and is connected by a dedicated connection cable 21. The connection cable 21 is more likely to be affected by electromagnetic waves and the like as its length increases.

  The malfunction monitoring unit 12 that is a determination unit determines whether the operation instructed by the control unit 10 to other parts is operating correctly, for example, when the operation panel unit 11 is instructed to turn on the LED, the LED is correctly lit. Whether or not a malfunction has occurred is monitored. If a malfunction occurs, the controller 10 is notified of the malfunction and the location where the malfunction occurred. The display unit 13 is configured by a display device such as a liquid crystal display, for example, and displays information instructed from the control unit 10.

  The reading unit 14 reads a document and sends the read information to the control unit. The reading unit 14 reads a document in the copy mode when performing copying, and reads the document in a scan (hereinafter referred to as “SCAN”) mode when reading a document other than when performing copying. Reading a document in the scan mode includes at least a case of reading a document by functioning as a scanner and a case of reading a document by a memory transmission function. In the memory transmission, information on a document read for transmission by facsimile is temporarily stored in the storage device by the control unit 10, and then the document information stored in the storage device is used as facsimile data independently of reading the document. It is a function to transmit.

  The printing unit 15 is configured by a printing device such as a printer, for example, and prints information received from the control unit 10 on a recording sheet. The printing unit 15 performs printing in the copy mode for copying, and performs printing in the recording mode for other than copying. When printing is performed in the recording mode, it includes at least a case of functioning as a printer to print information on recording paper and a case of printing by a memory receiving function. The memory reception is a function for printing the facsimile data stored in the storage device independently from the reception of the facsimile data after the facsimile data received by the facsimile is temporarily stored in the storage device by the control unit 10.

  The network control unit 16 is connected to the line network and controls transmission / reception of facsimile data to / from the line network. In the transmission mode, the network control unit 16 receives information on the original document that has been read in the scan mode at the time of memory transmission and once stored in the storage device from the control unit 10, and is transmitted as other facsimile data via the network. Send to a facsimile machine. In the facsimile transmission mode, the document information read by the reading unit 14 is received from the control unit 10 and transmitted in parallel to the other facsimile apparatus via the network as facsimile data.

  Further, in the reception mode, the network control unit 16 sends facsimile data received from another facsimile apparatus via the line network at the time of memory reception to the control unit 10 and stores it in the storage device by the control unit 10. The facsimile data stored in the storage device is sent from the control unit 10 to the printing unit 15 and printed in the recording mode. In the case of the facsimile reception mode, the facsimile data received from another facsimile apparatus via the network is sent to the control unit 10, and the control unit 10 prints the received facsimile data by the printing unit 15 in parallel. .

  The DSP unit 17 performs facsimile procedures, voice recording and playback, and signal processing for speakerphones. The DSP unit 17 performs signal processing for voice recording and playback in the voice recording / playback mode, and performs signal processing for the speakerphone in the speakerphone mode. The DSP unit 17 executes the facsimile procedure in conjunction with the network control unit 16 in the transmission mode, reception mode, facsimile transmission mode or facsimile reception mode. The wireless unit 18 performs local wireless communication, for example, wireless communication with the slave unit in the slave unit call mode. The external I / F unit 19 controls connection with an external device such as a USB memory.

  The standby mode is when operations such as SCAN mode, recording mode, copy mode, handset call mode, reception mode, transmission mode, facsimile transmission mode, facsimile reception mode, voice recording / playback mode, and speakerphone mode are not performed. It is an operation mode.

  FIG. 2 is a diagram illustrating a configuration of the operation panel unit 11. The operation panel unit 11 includes a plurality of light emitting units, for example, LEDs 112a to 112h, and a driving unit for driving the LEDs 112a to 112h, for example, a shift register 111. The operation panel unit 11 is connected to the control unit 10 by a connection cable 21. The connection cable 21 includes a data signal (hereinafter referred to as “DATA”) 211 as instruction information and a clock signal (hereinafter referred to as “CLK”) as an instruction signal. 212 signal lines are included.

  The shift register 111 serving as a storage unit is a register that stores, for example, 8-bit data from the 0th bit to the 7th bit. The shift register 111 is information indicated by the signal level of the DATA 211 at the time when the signal level of the CLK 212 changes from the low level (hereinafter referred to as “LOW level”) to the high level (hereinafter referred to as “HIGH level”), that is, at the rising edge of the signal. Is stored in the seventh bit. At the same time, the information stored in the seventh bit is in the sixth bit, the information stored in the sixth bit is in the fifth bit, the information stored in the fifth bit is in the fourth bit, the fourth bit Was stored in the third bit, the information stored in the third bit was stored in the second bit, the information stored in the second bit was stored in the first bit, and the first bit. Information is stored in the 0th bit. The LOW level is, for example, the ground level, that is, the voltage of 0V, and the HIGH level is, for example, the voltage of the power supply voltage 3.3V. The LOW level is the first signal level, and the HIGH level is the second signal level. The information indicated by the signal level is, for example, “0” or “1”. Information “0” indicated by the signal level is first information, and information “1” indicated by the signal level is second information.

  In the shift register 111, the 0th bit drives the LED 112a, the 1st bit drives the LED 112b, the 2nd bit drives the LED 112c, the 3rd bit drives the LED 112d, the 4th bit drives the LED 112e, The fifth bit drives LED 112f, the sixth bit drives LED 112g, and the seventh bit drives LED 112h. Further, the output of each bit of the shift register 111 is sent to the malfunction monitoring unit 12 as noise monitoring signals (hereinafter referred to as “NOISECHK”) 22a to 22h. Specifically, the 0th bit output is NOISECHK22a, the 1st bit output is NOISECHK22b, the 2nd bit output is NOISECHK22c, the 3rd bit output is NOISECHK22d, the 4th bit output is NOISECHK22e, The fifth bit output is sent to the malfunction monitoring unit 12 as NOISECHK 22f, the sixth bit output as NOISECHK 22g, and the seventh bit output as NOISECHK 22h. NOISECHK 22 is stored information.

  The malfunction monitoring unit 12, which is a determination unit, confirms whether the information that the control unit 10 instructs to each bit of the shift register 111 and the information stored by each bit notified by the NOISECHKs 22a to 22h match. It is determined whether or not, and the determination result is sent to the control unit 10. Information that the control unit 10 instructs to store in each bit of the shift register 111 is notified from the control unit 10 to the malfunction monitoring unit 12 when the control unit 10 instructs the shift register 111 to store information. Yes.

  FIG. 3 is a time chart of signals sent from the control unit 10 to the operation panel unit 11. DATA indicates information transmitted from the control unit 10 to the shift register 111 via DATA 211, and CLK (normal) indicates a clock signal transmitted from the control unit 10 to the shift register 111 via CLK 212. CLK (inversion) will be described later.

  The signal level of the clock signal in the signal non-change period Tx in which the signal level of the clock signal CLK (normal) is not changed is the LOW level. The shift register 111 captures information to be stored by each bit as described above at the rising edge of the clock signal.

  FIG. 4 is a diagram illustrating an example of noise that affects the clock signal. FIG. 4A shows a signal waveform when the signal level of the CLK 212 fluctuates due to the influence of the noise N1 on the power supply voltage side when the signal level of the CLK 212 in the signal non-change period Tx is the HIGH level. An example is shown. In this case, the signal level of CLK212 in the signal non-change period Tx is a HIGH level of voltage 3.3V, and the threshold level is VIH. 4A is lower than the threshold level VIH for the period of time T1, and the shift register 111 receives the CLK 212 of the LOW level for the period of time T1. Therefore, the shift register 111 takes in the information indicated by the DATA 211 when the CLK 212 changes from the LOW level to the HIGH level due to the influence of the noise N1.

  FIG. 4B shows a signal waveform when the signal level of the CLK 212 fluctuates due to the influence of the noise N2 on the ground level side when the signal level of the CLK 212 in the signal non-change period Tx is the LOW level. An example is shown. In this case, the signal level of the CLK 212 in the signal non-change period Tx is the LOW level of the voltage 0V, and the threshold level is VIL. 4B exceeds the threshold level VIL for the period of time T2, and the shift register 111 receives the CLK 212 of HIGH level for the period of time T2. Therefore, the shift register 111 takes in the information indicated by the DATA 211 when the CLK 212 changes from the LOW level to the HIGH level due to the influence of the noise N2.

  When the shift register 111 takes in the information indicated by the DATA 211 due to the influence of noise, the malfunction monitoring unit 12 is configured to store information instructed to each bit of the shift register 111 by the control unit 10 and each of the information notified by the NOISECHKs 22a to 22h. If the information stored in the bit does not match, it is determined that a malfunction has occurred in the shift register 111 and notifies the control unit 10 that a malfunction has occurred in the shift register 111.

  FIG. 5 is a diagram illustrating an example of a circuit for switching the signal level of the clock signal. The control unit 10 includes a CPU 101, an oscillator 102, and a flip-flop 103. The CPU 101 is the above-described central processing unit. The oscillator 102 is configured by a crystal oscillator, for example, and inputs a signal having a frequency twice the frequency of the clock signal to the trigger terminal T of the flip-flop 103.

  The flip-flop 103 is a set-reset type flip-flop having a trigger terminal T, and inverts the CLK 212 output from the output terminal Q every time the signal input to the trigger terminal T changes from the LOW level to the HIGH level. Therefore, the frequency of the CLK 212 is half the frequency of the oscillator 102. When a HIGH level signal is input to the set terminal S, the flip-flop 103 sets the CLK 212 output from the output terminal Q to HIGH level, and when the HIGH level signal is input to the reset terminal R, the flip-flop 103 outputs from the output terminal Q. Set CLK212 to LOW level. As for CLK212 output from the output terminal Q, a signal instructed to the set terminal S is prioritized.

  The CPU 101 inputs a HIGH level signal to the set terminal S, thereby setting the signal level of the CLK 212 in the signal non-change period Tx to a HIGH level, and inputs a HIGH level signal to the reset terminal R, so that the signal does not change. The signal level of the CLK 212 in the period Tx can be set to the LOW level. That is, by inputting a HIGH level signal to the set terminal S or by inputting a HIGH level signal to the reset terminal R, the signal level of the CLK 212 output from the output terminal Q is forcibly set to a HIGH level or a LOW level. Can be reversed.

  The signal level in the signal non-change period Tx of CLK (normal) shown in FIG. 3 is the LOW level, but the signal level in the signal non-change period Tx of CLK (normal) is inverted to become CLK (invert). In this case, the CPU 101 of the control unit 10 inverts the signal level in the signal non-change period Tx of the CLK 212 from the LOW level to the HIGH level by inputting the HIGH level signal to the set terminal S.

The facsimile machine 1 has different noise depending on the operation mode and the place where the facsimile apparatus 1 is installed, for example, static electricity charged on an operator or a document to be transmitted, or FM (Frequency).
Modulation) It is affected by noise such as electromagnetic waves from a transmission tower that transmits radio waves. Table 1 is a table showing noise received for each operation mode of the facsimile apparatus 1.

  FIG. 6 is a diagram illustrating an example of the malfunction signal level storage table 30. The malfunction signal level storage table 30 is a table that stores the signal level of the CLK 212 for each operation mode when the malfunction monitoring section 12 determines that malfunction has occurred, and is stored in the storage device of the control section 10 by the CPU 101 of the control section 10. Is done.

  FIG. 6A shows a malfunction signal level storage table 30a for storing the signal level of the CLK 212 when the malfunction monitoring unit 12 determines the malfunction most recently for each operation mode.

  The malfunction signal level storage table 30a includes a number field 31, a mode field 32, a default field 33, and a level field 34 when malfunction occurs. The number column 31 is a column indicating the serial number given to each operation mode, the mode column 32 is a column indicating each operation mode, and the default column 33 is a signal in the signal non-change period Tx in each operation mode. The level column 34 indicates the initial value of the level, and the level column 34 when a malfunction occurs is a column that indicates the signal level of the CLK 212 when the malfunction monitoring unit 12 determines the most recent malfunction in each operation mode. In the level column 34 when malfunction occurs, “H” is described when the signal level of the CLK 212 in the signal non-change period Tx when judged malfunction is HIGH, and the signal when malfunction is judged When the signal level of the CLK 212 in the non-change period Tx is LOW level, “L” is described, and “−” indicating that the operation mode has not been determined to be malfunctioning is blank. .

  The malfunction signal level storage table 30a shown in FIG. For one standby mode, a default column 33 “L” and a level column 34 “-” when a malfunction occurs are shown. Hereinafter, the default column 33 and the level column 34 upon occurrence of malfunction are respectively No. No. 2 SCAN mode “L” and “H” For the recording modes of No. 3, “L” and “−”, No. For the copy mode of “4”, “L” and “L”, no. For the handset communication mode of No. 5, "L" and "-", No. No. 6 transmission mode “L” and “−”, No. 7 reception modes, “L” and “−”, No. For the facsimile transmission mode No. 8, "L" and "-", No. For the facsimile reception mode 9, “L” and “−”, For the ten sound recording / playback modes, “L” and “−”, and For the 11 speakerphone modes, “L” and “−”.

  FIG. 6B shows a malfunction signal level storage table 30b that stores the number of signal levels of the CLK 212 when the malfunction monitoring unit 12 determines malfunction, for each operation mode.

  The malfunction signal level storage table 30b includes a number field 31, a mode field 32, a default field 33, a malfunction occurrence count field 35 at a HIGH level (indicated as “H level” in FIG. 6), and a LOW level (in FIG. 6, “L”). In this case, the number of malfunction occurrences in the “level”) is included. The number field 31, the mode field 32, and the default field 33 are the same as the number field 31, the mode field 32, and the default field 33 shown in FIG. 6A, and are described with the same reference numerals to avoid duplication. Is omitted. The malfunction occurrence count column 35 at the HIGH level is a column indicating the number of times when the signal level of the CLK 212 in the signal non-change period Tx when determined to be malfunction by the malfunction monitoring unit 12 is the HIGH level. The malfunction occurrence frequency column 36 in FIG. 6 is a column indicating the number of times when the signal level of the CLK 212 is the LOW level in the signal non-change period Tx when the malfunction monitoring unit 12 determines the malfunction.

  The malfunction signal level storage table 30b shown in FIG. For the standby mode 1, the default column 33 “L”, the malfunction occurrence count column 35 “0” at the HIGH level, and the malfunction occurrence count column 36 “0” at the LOW level are shown. Hereinafter, the malfunction occurrence count column 35 at the HIGH level and the malfunction occurrence count column 36 at the LOW level are respectively No. 2 SCAN mode, “1” and “0”, No. 3 recording modes, “0” and “0”, No. For the copy mode of “4”, “4” and “1”, no. For the handset communication mode of “5”, “0” and “0”, No. 6 transmission modes, “0” and “0”, 7 reception modes, “0” and “0”, No. For the facsimile transmission mode of “8”, “0” and “0”, no. For the facsimile reception mode of “9”, “0” and “0”, For the 10 audio recording / playback modes, "0" and "0" For the 11 speakerphone modes, they are “0” and “0”. The default column 33 is “L” for any operation mode.

  When the influence of noise generated is fixed on either the ground level side or the power supply voltage side or is biased depending on the installation location or operation mode, the malfunction signal level storage table 30a shown in FIG. 6 is used, the malfunction signal level storage table 30b shown in FIG. 6B is used when the influence of the generated noise occurs on either the ground level side or the power supply voltage side. Alternatively, at first, when the malfunction signal level storage table 30a is used and the influence of the generated noise occurs on either the ground level side or the power supply voltage side for the same operation mode, the malfunction signal level storage is performed for the operation mode. It is also possible to use the table 30b.

  FIG. 7 is a flowchart showing a malfunction prevention process executed by the control unit 10 and the malfunction monitoring unit 12. When monitoring a malfunction, for example, every time a predetermined time elapses or after completing other priority processing, the process proceeds to step A1. First, the case where the malfunction signal level storage table 30b is used will be described.

  In step A1, the malfunction monitoring unit 12 determines whether or not the information stored in the storage unit of the operation mode currently operating matches the information stored in the storage unit by the control unit 10. It is determined whether a malfunction has occurred. For example, when the storage unit is the shift register 111, the malfunction monitoring unit 12 determines whether or not the information indicated by the NOISECHKs 22a to 22h matches the information stored in the shift register 111 that is informed from the control unit 10. If they do not match, a determination result indicating that there is a malfunction is sent to the control unit 10, and if they match, a determination result indicating that there is no malfunction is sent to the control unit 10. When the control unit 10 receives the determination result indicating that there is no malfunction from the malfunction monitoring unit 12, the control unit 10 ends the malfunction prevention process, and when receiving the determination result indicating that there is a malfunction from the malfunction monitoring unit 12, the control unit 10 proceeds to Step A2. move on.

  In Step A2, the control unit 10 determines whether or not a malfunctioning signal level is stored in the malfunction signal level storage table 30b for the currently operating mode. If the number of times of the malfunction occurrence number column 35 at the HIGH level and the number of times of the malfunction occurrence number column 36 at the LOW level are “0”, the signal level in which the malfunction occurred is stored. It is determined that the number of times of malfunction occurrence count column 35 at the HIGH level and the number of malfunction occurrence count column 36 at the LOW level is any one of the number of times of malfunction occurrence count column 36. If it is not “0”, it is determined that the signal level in which the malfunction occurred is stored, and the process proceeds to Step A6.

  In step A3, the control unit 10 inverts the signal level of the CLK 212 when the clock signal to the storage unit in the currently operating mode, for example, the storage unit is the shift register 111, is provided. In step A4, the control unit 10 sets the signal level when a malfunction occurs to the current operation mode, the number of malfunction occurrences at the HIGH level in the malfunction signal level storage table 30b, or the number of malfunctions at the LOW level. The number of times in the column 36 is counted up to “1”. In step A5, when the operation mode when the malfunction occurs is completed, the control unit 10 returns the signal level of the clock signal to the original signal level, that is, the signal level before inversion, and terminates the malfunction prevention process. .

  In Step A6, the control unit 10 adds up the number of times that the malfunction has occurred with respect to the signal level of the operation mode in which the malfunction has occurred. Specifically, if the signal level of the clock signal in the signal non-change period Tx when a malfunction occurs is HIGH, the number of malfunction occurrences at the HIGH level in the malfunction signal level storage table 30b is counted. If the signal level of the clock signal in the signal non-change period Tx when a malfunction occurs is LOW, the number of malfunction occurrence count column 36 at the LOW level of the malfunction signal level storage table 30b is counted up. .

  In step A7, the control unit 10 periodically switches the signal level of the clock signal to the storage unit during the signal non-change period Tx of the current operation mode alternately between the HIGH level and the LOW level, and performs the malfunction prevention process. finish. The ratio between the HIGH level and the LOW level in one cycle is determined based on the number of times of malfunction occurrence number column 35 at the HIGH level and the number of times of malfunction occurrence number column 36 at the LOW level. For example, the period of one cycle of the clock signal in the signal non-change period Tx is 5 seconds, the number of times of malfunction occurrence number column 35 at the HIGH level is “1”, and the number of malfunction occurrence times column 36 at the LOW level is “4”. Then, in one cycle of the clock signal, the HIGH level is 4 seconds and the LOW level is 1 second.

FIG. 8 is a flowchart showing an operation mode switching process executed by the control unit 10.
When the operation of the operation panel unit 11 instructs the operation to be performed by the facsimile apparatus 1, and the control unit 10 switches the operation mode of the facsimile apparatus 1 to the operation mode corresponding to the instructed operation, the process proceeds to step B1.

  In step B1, the control unit 10 switches to the operation mode of the instructed operation, and sets the signal level of the CLK 212 to the number of times of the malfunction occurrence number column 35 at the HIGH level of the malfunction signal level storage table 30b for the switched operation mode. One cycle is switched between the HIGH level and the LOW level at a ratio determined based on the number of times of erroneous operation occurrence at the LOW level 36, and the operation mode switching process is terminated. When both the number of times of malfunction occurrence number column 35 at the HIGH level and the number of times of malfunction occurrence number column 36 at the LOW level are “0”, the signal level stored in the default column 33 is set and the operation mode is switched. The process ends. When ending the operation mode in which the signal level is switched by the operation mode switching process, the control unit 10 changes the signal level of the clock signal before switching the signal level by the operation mode switching process, that is, before switching periodically. Return to the signal level.

  When the malfunction signal level storage table 30a is used, the processing of steps A2, A6 and A7 shown in FIG. 7 is not performed, and in step A1, the control unit 10 gives a determination result indicating that the malfunction monitoring unit 12 has malfunctioned. If received, the process proceeds to step A3 without performing the process of step A2, and the process of step A3 is performed. In step A4, the control unit 10 stores the signal level when the malfunction occurs in the level column 34 when the malfunction occurs in the malfunction signal level storage table 30a for the current operation mode. Therefore, when the malfunction signal level storage table 30a is used, even if a malfunction has occurred in the past in the same operation mode, the signal non-change period in the next operation mode is always based on the signal level when the malfunction has occurred. The signal level to be set is determined. In step B1 shown in FIG. 8, the control unit 10 switches to the operation mode of the instructed operation, and changes the signal level of the CLK 212 to the level column 34 when a malfunction occurs in the malfunction signal level storage table 30a for the switched operation mode. The signal level stored in is inverted to the signal level, and the operation mode switching process is terminated. When the level column 34 at the time of malfunction occurrence is blank, the signal level stored in the default column 33 is set, and the operation mode switching process is terminated. When ending the operation mode in which the signal level is switched by the operation mode switching process, the control unit 10 changes the signal level of the clock signal before the signal level is switched by the operation mode switching process, that is, the switched operation mode. It returns to the signal level stored in the level column 34 at the time of malfunction occurrence in the malfunction signal level storage table 30a.

  In the above-described embodiment, the shift register 111 is shown as an example of the storage unit. However, the storage unit is not limited to the shift register 111. For example, a timing signal such as a D-type flip-flop or a flip-flop having a trigger terminal is used. It can be applied to a logic circuit that changes the information output at the time of change, and the output of the logic circuit is not limited to being used in a light emitting unit such as an LED, but is used for switching between conduction and cutoff of a transistor, for example. Also good.

  In the above-described embodiment, the facsimile apparatus 1 is shown as an example of the information processing apparatus. However, the facsimile apparatus 1 is not limited to the facsimile apparatus. For example, a scanner apparatus, a printing apparatus, a copying apparatus, a telephone apparatus, a composite apparatus, etc. An information processing apparatus may be used.

  As described above, the shift register 111 stores the first information, for example, “0” and the second information different from the first information, for example, “1”, and stores the stored information. Is output from the control unit 10 to the shift register 111 by sending out the DATA 211 representing either the first information or the second information and the CLK 212 instructing to store the DATA 211 to the shift register 111. Under the control, the malfunction monitoring unit 12 determines whether or not the DATA 211 sent from the control unit 10 to the shift register 111 matches the NOISECHK 22 output from the shift register 111.

  The shift register 111 stores the DATA 211 of the DATA 211 sent from the control unit 10 when the CLK 212 sent from the control unit 10 changes from the LOW level to the HIGH level. The control unit 10 monitors the malfunction. When the unit 12 determines that DATA 211 and NOISECHK 22 do not match, the signal level of CLK 212 is inverted in the signal non-change period in which the signal level of CLK 212 is not changed.

  For example, when the signal level of the CLK 212 in the signal non-change period is the ground level and the CLK 212 of the ground level fluctuates due to the influence of noise, the shift register 111 stores incorrect information, and the DATA 211 to be stored is inverted. Sometimes. If the malfunction monitoring unit 12 determines that DATA 211 and NOISECHK 22 do not match, the signal level of CLK 212 in the signal non-change period is inverted from the ground level to the level of the power supply voltage. Therefore, if the noise affects the ground side and does not affect the power supply side, the same noise is generated during the signal non-change period, and even if the CLK 212 is affected, the signal level is prevented from being inverted. be able to. In other words, even if the CLK 212, that is, the timing signal for storing information is affected by noise caused by static electricity or electromagnetic waves, it is possible to avoid the signal level from being inverted, and to reduce storing incorrect information. .

  Furthermore, the operation mode that was operated in any one of the plurality of operation modes and was operated when the control unit 10 determined that the DATA 211 and NOISECHK 22 do not match by the malfunction monitoring unit 12 The signal level of CLK212 during the signal non-change period is stored, and when switching to the operation mode storing the signal level of the signal non-change period among the plurality of operation modes, the signal level of CLK212 during the signal non-change period is The stored signal level is switched to the inverted signal level.

  Therefore, since the signal level of CLK 212 in the signal non-change period can be switched according to the operation mode, even if the type of noise generated in each operation mode is different, the influence of noise that is likely to be generated in each operation mode. Can be reduced for each operation mode.

  Furthermore, the number of times of operation in any one of a plurality of operation modes, and the control unit 10 determining that the DATA 211 and NOISECHK 22 do not match by the malfunction monitoring unit 12 is the signal non-change period. Is counted for each signal level of CLK212, and the counted number is stored for each operation mode. When switching to any one of the plurality of operation modes, the signal level of the CLK 212 in the signal non-change period is switched alternately between the LOW level and the HIGH level in a predetermined cycle, The ratio of the LOW level time to the HIGH level time is the same as the ratio of the number of times counted for the HIGH level stored for the switching operation mode to the number of times counted for the LOW level.

  Therefore, when two types of noise on the power supply side and the ground side occur in one operation mode, the signal level of CLK212 in the signal non-change period is periodically switched according to the frequency of occurrence of malfunction. It is possible to further reduce the influence of noise having a larger amount.

  Furthermore, when the control mode ends the operation mode in which the signal level is switched, the signal level of the CLK 212 is returned to the signal level before the switching, so that the signal of the CLK 212 in the signal non-change period in the original operation mode. When the level is inverted, the signal level that has been inverted in the original operation mode, that is, the signal level that is hardly affected by noise can be restored.

  Furthermore, at least any one of the standby mode, SCAN mode, recording mode, copy mode, handset call mode, reception mode, transmission mode, facsimile transmission mode, facsimile reception mode, voice recording / playback mode, and speakerphone mode Even if the operation is performed, the influence of noise that easily occurs in each operation mode can be reduced for each operation mode.

DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 10 Control part 11 Operation panel part 12 Malfunction monitoring part 13 Display part 14 Reading part 15 Printing part 16 Network control part 17 DSP part 18 Radio | wireless part 19 External I / F part 20 Data bus 21 Connection cable 22a-22h NOISECHK
30 Malfunction signal level storage table 101 CPU
102 Oscillator 103 Flip-flop 111 Shift register 112a-112h LED
211 DADA
212 CLK

Claims (5)

A storage unit for storing any one of the first information and the second information different from the first information, and outputting the stored information;
A control unit that controls the storage unit by sending instruction information indicating either the first information or the second information and an instruction signal that instructs to store the instruction information to the storage unit;
A determination unit that determines whether the instruction information sent to the storage unit by the control unit and the storage information output by the storage unit match,
The storage unit stores the instruction information at the time when the instruction signal transmitted from the control unit changes from the first signal level to the second signal level among the instruction information transmitted from the control unit,
The control unit reverses the signal level of the instruction signal during a signal non-change period in which the signal level of the instruction signal is not changed when the determination unit determines that the instruction information and the stored information do not match. Information processing apparatus. Operate in one of a plurality of operation modes,
The controller is
Storing the signal level of the instruction signal in the signal non-change period of the operation mode that was operating when the determination unit determines that the instruction information and the storage information do not match,
When switching to an operation mode in which the signal level of the signal non-change period is stored among a plurality of operation modes, the signal level of the instruction signal in the signal non-change period is switched to a signal level obtained by inverting the stored signal level. The information processing apparatus according to claim 1. Operate in one of a plurality of operation modes,
The controller is
The number of times that the determination unit determines that the instruction information and the stored information do not match is counted for each signal level of the instruction signal in the signal non-change period when it is determined that they do not match, and counted. Memorize the number of times for each operation mode,
When switching to any one of the plurality of operation modes, the signal level of the instruction signal in the signal non-change period is switched alternately between the first signal level and the second signal level in a predetermined cycle, The ratio between the time of the first signal level and the time of the second signal level in the predetermined period is the number of times counted for the second signal level stored for the switching operation mode and the ratio for the first signal level. The information processing apparatus according to claim 1, wherein the ratio is the same as the ratio of the number of times the recording is performed.   4. The information processing apparatus according to claim 2, wherein the control unit returns the signal level of the instruction signal to the signal level before switching when the operation mode in which the signal level is switched is terminated.   The plurality of operation modes include at least a standby mode, a scan mode, a recording mode, a copy mode, a slave phone call mode, a reception mode, a transmission mode, a facsimile transmission mode, a facsimile reception mode, a voice recording / playback mode, and a speakerphone mode. The information processing apparatus according to claim 2, comprising one of them.

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