JP2011252984A - Image forming apparatus, and noise prevention method and program for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus and the like capable of effectively performing ANC control against an operating noise when a plurality of rotation bodies are simultaneously rotated, realizing an improvement in a noise reduction effect.SOLUTION: Noise of a plurality of rotation bodies 406 and 407 measured by noise measurement means 403 is analyzed by analysis means 403. Based on the analysis result, a drive parameter of at least any of the rotation bodies to be adjusted is adjusted to change a noise characteristic of the entirety of the plurality of rotation bodies. Further, a sound for canceling the noise of the plurality of rotation bodies is outputted via a sounding body 404 in a state in which the noise characteristic of the entirety of the plurality of the rotation bodies is changed.

Description

  The present invention relates to an image forming apparatus applied to an MFP (Multi Function Peripherals) having a noise prevention function for a rotating body such as a fan, a noise prevention method of the same, and a noise prevention program.

  In an image forming apparatus such as an MFP, a plurality of fans are provided on the upper side of the fixing unit in order to cool the paper and prevent the paper from being attached. Currently, effective measures are being sought.

  In general, as shown in FIG. 11, the rotation control for the fan as described above is performed by a plurality of (for example, two) control signals set in advance for each mode (for example, monochrome mode and color mode) from the CPU 301 mounted on the control board 300. ) To change the rotation speed of the fans 302 and 303 to obtain the optimum fan air volume and noise level.

  However, in the configuration in which the rotation speeds of the fans 302 and 303 are controlled using preset control signals in this way, the same control signal is applied to each device in consideration of individual variations of the fans themselves and variations in power supply voltage to be supplied. Strictly speaking, there is a problem that the same fan speed (noise level) cannot be obtained even if it is input.

  Under these circumstances, a so-called ANC (active noise control) system has been proposed in which a speaker is arranged as a sounding body in the vicinity of the fan, and the noise from the fan is canceled by the sound from the speaker. ing. (For example, refer to Patent Document 1).

  Also, for the fan that is rotating during standby, sound data of opposite phase is created based on the pre-stored sampling sound (signal at the maximum spectrum frequency), and the sound of the opposite phase is output to mute the sound. A technique for realizing the above has also been proposed (see, for example, Patent Document 2).

Japanese Patent Application No. 4-169401 Japanese Patent Application No. 2003-7794

  However, in the conventional technology in which the ANC is introduced, although the noise canceling action for one fan is effective to some extent only in the low frequency band, the silencing effect tends to be hardly exhibited in the high frequency band. . In particular, in the case of having a plurality of fans, the number of frequency points at which noise peaks and average peaks appear compared to a single case increases, and even if ANC control is performed, it is possible to completely silence the sound. There is a problem that it is difficult and sometimes the sound may be loud.

  Further, even with the technique of outputting the sound with the opposite phase based on the pre-stored sampling sound, the silencing action for a plurality of fans is not sufficient.

  The present invention has been made in view of the above circumstances, and it is possible to improve the noise reduction effect by effectively demonstrating ANC control for the operation sound when rotating a plurality of rotating bodies simultaneously. It is an object of the present invention to provide an image forming apparatus and a noise prevention method for the apparatus, and to provide a noise prevention program for causing a computer of the image forming apparatus to execute the noise prevention method.

The above problem is solved by the following means.
(1) Noise measuring means for measuring the noise of a plurality of rotating bodies, analyzing means for analyzing the measured noise, and at least one rotating body to be adjusted based on the analysis result by the analyzing means A characteristic changing unit that changes a noise characteristic of the plurality of rotating bodies as a whole by adjusting a drive parameter, and a plurality of the plurality of rotating bodies that are changed in noise characteristics by the characteristic changing unit. An image output apparatus comprising: audio output means for outputting sound for canceling noise of a rotating body through a sounding body.
(2) The characteristic changing unit adjusts the drive parameter of the rotating body to be adjusted so that the peak of the high-frequency noise level of the rotating body to be adjusted moves to a low frequency range. Image forming apparatus.
(3) The characteristic changing unit is configured to drive the driving parameter of the rotating body to be adjusted so that the peak of the noise level in the low frequency region of the rotating body to be adjusted overlaps the peak of the noise level of another rotating body. 3. The image forming apparatus according to 1 or 2 above, wherein
(4) Noise measurement of a plurality of rotating bodies by the noise measuring unit, analysis by the analyzing unit, adjustment of driving parameters of the rotating unit by the characteristic changing unit, and sound output by the audio output unit are performed by the image forming apparatus. Storage means for storing the drive parameters of each rotating body and the sound output parameters by the sound output means at the time of power ON, initial operation after returning from the power saving mode, and image stabilization The image forming apparatus according to any one of items 1 to 3, wherein the driving parameter and the sound output parameter stored in the storage unit are used to perform subsequent driving of each rotating body and cancellation control for noise of the rotating body. .
(5) The image forming apparatus according to any one of Items 1 to 4, wherein the adjustment of the drive parameter is control of the number of rotations and / or phase of the rotating body.
(6) A noise measuring step for measuring noise of a plurality of rotating bodies, an analyzing step for analyzing the measured noise, and at least one rotating body to be adjusted based on an analysis result in the analyzing step A characteristic changing step for changing the noise characteristics of the plurality of rotating bodies as a whole by adjusting a driving parameter; and the noise characteristics of the plurality of rotating bodies as a whole are changed in the characteristic changing step. And a sound output step of outputting a sound for canceling the noise of the rotating body through a sounding body. A noise prevention method for an image forming apparatus, comprising:
(7) A noise measuring step for measuring noise of a plurality of rotating bodies, an analyzing step for analyzing the measured noise, and at least one rotating body to be adjusted based on an analysis result in the analyzing step A characteristic changing step for changing the noise characteristics of the plurality of rotating bodies as a whole by adjusting a driving parameter; and the noise characteristics of the plurality of rotating bodies as a whole are changed in the characteristic changing step. A noise prevention program for causing a computer of an image forming apparatus to execute a sound output step of outputting sound for canceling noise of a rotating body through a sounding body.

  According to the invention described in (1) above, the noise of the plurality of rotating bodies measured by the noise measuring means is analyzed by the analyzing means, and at least one of the rotating bodies to be adjusted based on the analysis result By adjusting the driving parameters, the noise characteristics of the plurality of rotating bodies as a whole are changed. Then, with the noise characteristics of the plurality of rotating bodies as a whole changed, a sound for canceling the noises of the plurality of rotating bodies is output through the sounding body. In other words, by adjusting the drive parameter of at least one of the rotating bodies to be adjusted, it is possible to change to a noise characteristic that makes it easier to apply ANC control. For this reason, the noise canceling action can be effectively exhibited by the sound from the sounding body by the execution of the ANC control.

  According to the invention described in the above item (2), the rotator to be adjusted so that the peak of the noise level in the high frequency range of the rotator to be adjusted moves to the low frequency range where the effect of ANC control is likely to be effective. Since the driving parameters are adjusted, a larger noise prevention effect can be obtained.

  According to the invention described in (3) above, the rotator to be adjusted is arranged such that the peak of the noise level in the low frequency region of the rotator to be adjusted overlaps the peak of the noise level of the other rotator. Therefore, the number of peaks of the entire noise level is reduced, and ANS control is facilitated.

  According to the invention described in the above item (4), noise measurement and analysis of a plurality of rotating bodies, adjustment of driving parameters of the rotating bodies, and sound output are performed after the image forming apparatus is powered on after returning from the power saving mode. Since it is performed at least one of the initial operation and the image stabilization, ANC control that matches the latest state of the rotating body can be performed.

  According to the invention described in item (5) above, the noise characteristics of the entire plurality of rotating bodies can be changed by controlling the rotation speed and / or phase of the rotating body to be adjusted.

  According to the invention described in the above item (6), the ANC control can be changed to a noise characteristic that can be more easily applied by adjusting the drive parameter of at least one of the rotating bodies to be adjusted. The sound canceling action can be effectively exhibited by the sound from the sounding body by the execution of the control.

  According to the invention described in (7) above, the noise of a plurality of rotating bodies is analyzed, and based on the analysis result, the drive parameters of at least one of the rotating bodies to be adjusted are adjusted. It is possible to cause the computer of the image forming apparatus to execute a process of changing the noise characteristics of the entire plurality of rotating bodies and performing ANC control in this state.

1 is a schematic configuration diagram showing an MFP to which an image forming apparatus according to an embodiment of the present invention is applied. FIG. 6 is a perspective view illustrating a fan installation state of a fixing unit of the MFP. 2 is a block diagram illustrating an electrical configuration of the MFP. FIG. It is a principle block diagram of ANC. It is a wave form diagram for operation explanation by ANC. It is a flowchart which shows the flow of the noise control process by ANC. It is a block diagram which shows the structure of the rotary body control part in which ANC was introduced. It is a graph which shows the relationship between the noise level before the rotation speed control (FIG. 8 (A)) and after control (FIG. 8 (B)) of the several fan which is a noise source. It is a flowchart which shows the flow of the control processing in the adjustment stage before ANC control performed at the time of power-ON or image stabilization control. It is a part of flowchart of FIG. It is a block diagram which shows the structure of the conventional rotary body control.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an MFP to which an image forming apparatus according to an embodiment of the present invention is applied.

  In FIG. 1, the MFP 100 includes a reading unit 105 that reads a document image, an image processing unit 106, an image forming unit 107 that prints image data, a paper feeding unit 201, and a paper discharge unit 101. .

  The image forming unit 107 includes image forming units 50Y, 50M, 50C, and 50K corresponding to yellow (Y), magenta (M), cyan (C), and black (K), a transfer belt 51, and the like. In addition, the image forming apparatus includes a fixing unit 400 that fixes the toner image transferred to the paper.

  A document image is read by the image reading unit 105, and the image data is processed by the image processing unit 106 and sent to the image forming unit 107. Here, as the image data, toner images corresponding to the image data of the respective colors are formed by the image forming units 50Y, 50M, 50C, and 50K, and the toner images of the respective colors are transferred to the transfer belt 51.

  On the other hand, the sheet fed from the sheet feeding unit 201 is conveyed to the image forming unit 107. After each color toner image is transferred from the transfer belt 51 to a sheet, the sheet is conveyed to the fixing unit 400 to fix the toner image, and then discharged to the sheet discharge unit 101.

  As shown in FIG. 2, fans 406 and 407 are installed in the fixing unit 400 in order to cool the paper and prevent the paper from adhering.

  Near the fans 406 and 407, a speaker 404 and a microphone (hereinafter referred to as a microphone) 405 as a sound generator for generating mute data for noise during the rotational operation of the fans 406 and 407 are disposed. Therefore, the ANC control (see FIG. 4) described above can be performed.

  FIG. 3 is a block diagram showing an electrical configuration of MFP 100.

  3, the MFP 100 includes a control unit 101 including a CPU, an operation panel unit 102, a ROM 103, a RAM 104, an image reading unit 105, an image processing unit 106, an image forming unit 107, and a data storage unit. 108, an external interface (I / F) unit 109, and a user identification unit 110.

  The control unit 101 comprehensively controls the overall operation of the MFP 100. In this embodiment, the control unit 101 executes the ANC control described above.

  The operation panel unit 102 includes a display unit 102A made of, for example, an LCD, and a key unit 102B. The display unit 102A can be used when performing operation settings for various functions, and can display various messages. The key unit 102 includes, for example, a numeric keypad, a start button, and a stop button.

  The ROM 103 is a memory in which an operation program for the control unit 101 is stored.

  The RAM 104 is a memory that provides a work area when the control unit 101 operates.

  The image reading unit 105 reads an image such as a document and converts it into electronic data.

  The image processing unit 106 performs predetermined image processing on the image data from the image reading unit 105 and sends it to the image forming unit 107.

  The image forming unit 107 has an engine function for printing image data on paper according to predetermined job conditions.

  The data storage unit 108 stores various data. Here, data obtained by measuring noise generated during the rotation operation of the fans 406 and 407, data analysis results, data after controlling the rotation speed and phase of the fans 406 and 407, and anti-phase data for silencing are stored. ing.

  The external I / F unit 109 has a communication function for transmitting and receiving data to and from a user terminal (not shown) (for example, a personal computer: PC) connected via a network 111 such as an in-house LAN. is there.

  The user identification unit 110 has a function of detecting a user in the vicinity of the apparatus using, for example, an infrared sensor, or identifying a user by detecting a user ID for logging in by wireless communication.

  FIG. 4 is a principle configuration diagram of the ANC control mechanism.

  In FIG. 4, the ANC control mechanism mainly generates a noise collecting microphone 12 disposed in the vicinity of a rotating body that is a noise source, for example, a fan 11, and an audio signal from the microphone 12, and the fan 11 is generated. A signal processing unit 13 that generates an audio signal having the same amplitude and opposite phase as the noise waveform (see FIG. 5), a speaker 14 as a sound generator that outputs the audio signal having the opposite phase generated by the signal processing unit 13, and a fan And an error detection microphone 15 that detects a synthesized sound source due to mutual interference between the noise 11 and the sound of the speaker 14 and sends it to the signal processing unit 13 as a feedback signal.

  Specifically, the rotational sound of the fan 11 that is a noise source is collected by the microphone 12, and the noise level is measured by the signal processing unit 13. On the other hand, the signal processing unit 13 generates an audio signal with the same amplitude as the noise level, and outputs the audio signal with the antiphase via the antiphase audio speaker 14. As a result, as shown in FIG. 5, the noise from the fan 11 is canceled out by the mutual interference between the noise from the fan 11 and the sound having the opposite phase.

  Further, the synthesized sound due to the mutual interference between the noise from the fan 11 and the reverse phase sound from the speaker 14 is detected by the microphone 15, and the detection signal is fed back to the signal processing unit 13. Since the amplitude characteristic and the phase characteristic are adjusted, an effect of canceling out noise generated by the fan 11 is effectively exhibited.

  In some cases, feedback control is not performed and the error detection microphone 15 is unnecessary.

  FIG. 6 is a flowchart showing the flow of noise control processing by ANC.

  In FIG. 6, in step S <b> 1, noise generated by the fan 11 is detected by the microphone 12, and in step S <b> 2, an audio signal having an antiphase with respect to the measured noise is generated by the signal processing unit 13. In step S <b> 3, the reverse phase sound generated by the signal processing unit 13 is output from the speaker 14 and is synthesized with the noise generated by the fan 11 to cause mutual interference.

  In step S4, the synthesized sound of the noise generated by the fan 11 and the reverse phase sound from the speaker 14 is measured by the error detection microphone 15, and in step S5, the signal processing unit 13 is fed back with the measurement signal. Thus, the amplitude characteristic and phase characteristic of the audio having the opposite phase are adjusted.

  In step S6, it is determined whether or not there is an end instruction. If there is no end instruction (NO in step S6), the process returns to step S5, and if there is an end instruction (YES in step S6), the process ends.

  FIG. 7 is a block diagram showing a configuration of a rotating body control unit in which ANC is introduced.

  In FIG. 7, the rotating body control unit is configured by a CPU 402 (corresponding to the control unit 101 in FIG. 3) mounted on the control board 400, a ANC control board 401, and a DSP (Digital Signal Processor). A signal processing unit 403, a microphone for collecting sound 405 disposed in the vicinity of a plurality of (for example, two) fans 406 and 407, and a speaker as a sound generator that outputs an audio signal generated by the signal processing unit 405 404.

  In this example, the signal processing unit 403 is provided with a noise data analysis function, a voice output function, and the like, but each of these functions may be realized by individual means or by the CPU 402. May be.

  The CPU 402 sends a rotation speed control signal to the fans 406 and 407 for each mode. Of course, all the control may be performed by either one of the CPU 402 and the signal processing unit 403 without distributing the control.

  In the rotation control with such a configuration, each noise due to the rotation of the two fans 406 and 407 is detected by the microphone 405, and the detected noise signal is sent to the signal processing unit 403 and input by the signal processing unit 403. Each noise level and frequency are analyzed.

  As a result of the analysis, if the CPU 402 determines that the number of frequency points with a noise level equal to or higher than a certain threshold (for example, 30 dB shown in FIG. 8) is equal to or greater than a predetermined number, the fans 406 and 407 At least one of them is driven by shifting the rotational speed and / or operation timing (phase) as drive parameters.

  Then, noise is collected again by the microphone 405, and the frequency of each noise input by the signal processing unit 403 is analyzed. By this analysis, the above-described operation is repeated until the number of frequency points having a noise level equal to or higher than a certain threshold value is less than a predetermined number. At that time, for example, the number of rotations and / or phase weighted so as to reduce the noise level in a frequency band of 4 kHz or higher is controlled.

  After the control of the rotational speed or the like is completed, the fan drive parameter value at that time is stored in the data storage unit 108 (FIG. 3). Thereafter, the ANC control described above is performed on the waveform adjusted by the control described above, and the noise of the fans 406 and 407 is reduced.

  The waveform data of the antiphase sound used in the ANC control is also stored in the data storage unit 108.

  In the rotation control, based on the analysis result of the noise, the rotation speed and phase of the fans 406 and 407 are controlled so that the total number of noise peaks is small in the low frequency band where the ANC control is likely to be effective. Thus, the burden of ANC control can be reduced, and an effective noise reduction effect can be obtained.

  Further, based on the analysis result of the noise, the rotational speed and phase of at least one of the fans 406 and 407 are controlled, and the peak of the noise level in the high frequency range is moved to the low frequency range, so that the ANC control is easily effective. Become.

  Further, the noise analysis data and the noise data stored in the data storage means 108 are compared, and the noise peak is adjusted to the frequency band determined to have a large silencing effect by the ANC control on the low frequency side. In addition, if the rotational speed and phase of the fans 406 and 407 are controlled, the silencing action by the ANC control can be easily and effectively exhibited.

  8A and 8B are graphs showing the relationship between the noise level and the center frequency before and after the rotation speed and / or phase of the fans 406 and 407 are changed.

  The noise level threshold value analyzed by the signal processing unit 403 is set to 30 dB, for example.

  Here, with respect to the noise level of the two fans 406 and 407, with respect to a point that is equal to or higher than the threshold value of 30 dB, the rotation speed and phase of one fan 407 is changed from the peak of the high frequency band, and the peak is on the low frequency side. The control is repeatedly performed while confirming that they are shifted to each other.

  On the low frequency side where ANC control is likely to be effective, the peak is overlapped so that there are few peaks, and then the load on ANC control is reduced.

  Before the rotational speed control of the fans 406 and 407, as shown in FIG. 8A, the noise level peaks of the two fans 406 and 407 overlap at the center frequency of 1600 Hz.

  On the other hand, after the rotation speed control of the fans 406 and 407, as shown in FIG. 8B, the peak of the noise level is centered on one fan 407 by changing the rotation speed and phase. The frequency is shifted to 1250 Hz. That is, the peak of the noise level is shifted to the low frequency side, and the ANC control is more effective.

  Further, the peak of the noise level in the low frequency region (1000 Hz or less) where the effect of ANC control is easily produced is maintained as it is without deviation.

  Further, the noise level can be reduced even at a center frequency of 2500 to 3150 Hz where ANC control becomes difficult.

  FIG. 9 and FIG. 10 are flowcharts showing the flow of control processing in the adjustment stage before the ANC control performed at the time of initial operation after returning from the power saving mode or image stabilization control when the image forming apparatus is turned on. is there. This process is executed by the CPU 101 (402) of the MFP 100 operating according to an operation program recorded on a recording medium such as the ROM 103.

  In FIG. 9, in step S11, the fans 406 and 407 are operated. In step S12, it is determined whether or not the fans 406 and 407 have reached the steady rotational speed. If the fans 406 and 407 have not reached the steady rotational speed (NO in step S12), the process waits until they reach. If the fans 406 and 407 reach the steady rotational speed (YES in step S12), the noise level of the fans 406 and 407 is measured in step S13.

  In step S14, frequency analysis is performed on the measured noise of the fans 406 and 407, and in step S15, the noise data of the fans 406 and 407 analyzed for frequency number is stored in the data storage unit.

  In step S16, it is determined whether or not there is a frequency point with a noise level equal to or higher than a threshold value for the noise data of the fans 406 and 407 subjected to frequency number analysis. (NO in step S16), the final noise data is stored in the data storage unit 108, and the process ends.

  If there is a frequency point with a noise level equal to or higher than the threshold (YES in step S16), in step S18, after entering the rotation speed and / or phase adjustment mode for at least one of the fans 406 and 407, the step of FIG. Proceed to S19.

  In FIG. 10, in step S19, it is determined whether or not the rotation speed and / or phase adjustment for the fans 406 and 407 is the first time, and if the rotation speed and / or phase adjustment for the fans 406 and 407 is the first time. (YES in step S19), in step S22, after changing the rotation speed and / or phase of at least one of the fans 406 and 407, the process returns to step S13 (FIG. 9). If the rotation speed and / or phase adjustment for fans 406 and 407 is not the first time (NO in step S19), the process proceeds to step S20.

  In step S20, it is determined whether or not the noise of the fans 406 and 407 has a peak at a frequency point of 1000 Hz or higher. If there is a peak at a frequency point of 1000 Hz or higher (YES in step S20), in step S21 the previous time Compare the stored frequency analysis data with the currently stored frequency analysis data to determine whether the frequency peak has shifted to the low frequency side. If the frequency peak has shifted to the low frequency side, (YES in step S21), the process returns to step S17, and if the frequency peak is not shifted to the low frequency side (NO in step S21), the process returns to step S13 via step S22.

  If there is no peak at a frequency point of 1000 Hz or more (NO in step S20), in step S23, the frequency analysis data stored last time is compared with the frequency analysis data stored this time, and a frequency peak is present on the low frequency side. It is determined whether or not the frequency peaks are overlapped on the low frequency side (YES in step S23), the process proceeds to step S17, and if the frequency peaks are not overlapped on the low frequency side (NO in step S23). ), Step S22 is returned to Step S13.

  As the timing for performing the control, the ANC control is performed with the rotation speed and / or the phase control performed when the MFP 100 is turned on, at the initial operation after returning from the power saving mode, or at the time of image stabilization control. Further, based on the data at that time, only the ANC control may be performed during the standby of MFP 100 and during the transition from the end of printing to the standby.

  Further, at the time of printing, an antiphase waveform may be output when the ANC control is performed while the MFP 100 is in the standby state and during the transition from the end of printing to the standby state.

  In this example, the noise countermeasures for the two fans 406 and 407 have been described, but the noise value can be reduced by the same control even when the number of fans is three or more.

100 MFP (image forming apparatus)
108 storage unit 402 CPU
405 Microphone 403 Signal processing unit (audio output unit, analysis unit)
404 Speaker 406,407 Fan

Claims (7)

Noise measuring means for measuring the noise of a plurality of rotating bodies;
An analysis means for analyzing the measured noise;
Based on the analysis result by the analysis means, by adjusting the drive parameters of at least one of the rotating bodies that are to be adjusted, characteristic changing means for changing the noise characteristics as the whole of the plurality of rotating bodies;
A sound output means for outputting a sound for canceling the noise of the plurality of rotating bodies through a sounding body in a state where the noise characteristics of the plurality of rotating bodies as a whole are changed by the characteristic changing means;
An image forming apparatus comprising:   2. The image according to claim 1, wherein the characteristic changing unit adjusts a drive parameter of the rotating body to be adjusted so that a peak of a noise level in a high frequency range of the rotating body to be adjusted moves to a low frequency range. Forming equipment.   The characteristic changing unit adjusts the driving parameter of the rotating body to be adjusted so that the peak of the noise level in the low frequency region of the rotating body to be adjusted overlaps the peak of the noise level of another rotating body. The image forming apparatus according to claim 1. Noise measurement of a plurality of rotating bodies by the noise measuring unit, analysis by the analyzing unit, adjustment of driving parameters of the rotating unit by the characteristic changing unit, and sound output by the audio output unit are performed when the image forming apparatus is turned on. , At the time of the initial operation after returning from the power saving mode, at least one of the image stabilization, storage means for storing the driving parameters of each rotating body at that time and the sound output parameters by the sound output means,
The image forming apparatus according to any one of claims 1 to 3, wherein the driving parameter and the audio output parameter stored in the storage unit are used to perform subsequent driving of each rotating body and canceling control for noise of the rotating body.   The image forming apparatus according to claim 1, wherein the adjustment of the driving parameter is control of a rotational speed and / or a phase of a rotating body. A noise measurement step for measuring the noise of a plurality of rotating bodies;
An analysis step for analyzing the measured noise;
Based on the analysis result in the analysis step, by adjusting a drive parameter of at least one of the rotating bodies to be adjusted, a characteristic changing step of changing noise characteristics as the whole of the plurality of rotating bodies;
A sound output step of outputting sound for canceling the noise of the plurality of rotating bodies through a sounding body in a state where the noise characteristics of the plurality of rotating bodies as a whole are changed in the characteristic changing step;
A noise prevention method for an image forming apparatus, comprising: A noise measurement step for measuring the noise of a plurality of rotating bodies;
An analysis step for analyzing the measured noise;
Based on the analysis result in the analysis step, by adjusting a drive parameter of at least one of the rotating bodies to be adjusted, a characteristic changing step of changing noise characteristics as the whole of the plurality of rotating bodies;
A sound output step of outputting sound for canceling the noise of the plurality of rotating bodies through a sounding body in a state where the noise characteristics of the plurality of rotating bodies as a whole are changed in the characteristic changing step;
Is a noise prevention program for causing a computer of the image forming apparatus to execute.

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