JP6868176B2 - Diagnostic equipment, diagnostic systems and programs - Google Patents

Description

The present invention relates to diagnostic devices, diagnostic systems and programs.

In Patent Document 1, in an image forming apparatus for forming an image on a sheet, a storage means for storing a normal operating sound of the image forming apparatus and a sound detection for detecting an operating sound generated from the image forming apparatus. The image forming apparatus is based on the means, the first sound information stored in the storage means, the second sound information detected by the sound detecting means, and the operation information of the image forming apparatus. An image forming apparatus is disclosed, which comprises a specific means for identifying an abnormal portion.

Patent Document 2 describes sound conversion that converts sound inside the image processing device into an electric signal in an image processing device having an image forming unit that forms an image on the printing paper and a conveying unit that conveys the printing paper. Disclosed is an image processing apparatus including a unit, a sound analysis unit that analyzes an electric signal converted by the sound conversion unit, and an output unit that outputs the result of analysis by the sound analysis unit. There is.

Patent Document 3 describes a set data consisting of a combination of a plurality of types of information acquired from a test machine equipped with a component or an internal device, and the normal set data acquired when the component or the internal device is in a normal state. In the set data sorting method for discriminating whether the part or the internal device is the abnormal set data acquired when the part or the internal device is in an abnormal state, at least from a predetermined start point of the above-mentioned part or the internal device. A data construction process for constructing time-series data of the set data by acquiring and storing the set data from the test machine at a predetermined cycle during the period up to the time when a failure occurs, and a plurality of data in the time-series data. Based on the classification process of classifying which of the plurality of clusters each of the set data corresponds to by cluster analysis and the classification result, the appearance pattern of the cluster changes at a time before the failure occurrence time and at the time of cluster appearance. A specific step that specifies the starting point as a transition point when the part or internal device transitions from a normal state to an abnormal state, and among a plurality of the set data in the time series data, from the transition point to immediately before the failure occurrence point. The feature is that the group data acquired up to this point is separated as abnormal group data, while the group data acquired from the start time to immediately before the transition point is separated as normal group data. A method for separating group data is disclosed.

JP-A-2007-079263 Japanese Unexamined Patent Publication No. 2008-290288 Japanese Unexamined Patent Publication No. 2010-114701

When recording the sound emitted by the diagnostic target or acquiring it as diagnostic data, not only the sound emitted by the diagnostic target but also the surrounding sounds of the diagnostic target may be recorded or acquired as diagnostic data. Yes, there is a risk of confidentiality leakage.

The present invention provides a diagnostic device, a diagnostic system and a program capable of warning that a recording is being made or a recording is possible even if the data is not acquired as diagnostic data. The purpose.

The present invention according to claim 1 is a recording means for recording a sound emitted by a diagnosis target, a reception means for receiving an operation from a user, and when the reception means receives an operation, a predetermined time before and after including the time when the operation is received. It is a diagnostic apparatus having an acquisition means for acquiring time recording data as diagnostic data, and a warning means for warning that the recording means has started recording before receiving an operation by the reception means.

The present invention according to claim 2 is a recording means for recording a sound emitted by a diagnosis target, a reception means for accepting an operation from a user, and when the reception means accepts an operation, predetermined before and after including the time when the operation is accepted. An acquisition means for acquiring time recording data as diagnostic data, a first warning means for warning that the recording means has started recording, and a sound recording for which the recording means is used as diagnostic data have started. It is a diagnostic apparatus having a second warning means for warning.

The present invention according to claim 3 includes a recording means for recording a sound emitted by a diagnosis target, a reception means for receiving an operation from a user, and when the reception means receives an operation, recording for a predetermined time after the reception means receives the operation. An acquisition means for acquiring data as diagnostic data, a first warning means for warning that recording by the recording means is possible, and recording of a sound used by the acquisition means as diagnostic data have been started. It is a diagnostic apparatus having a second warning means for warning that.

According to the fourth aspect of the present invention, the second warning means is the diagnostic apparatus according to any one of claims 1 to 3, which issues a warning of a means different from the first warning means.

The present invention according to claim 5 is the diagnostic apparatus according to any one of claims 1 to 4, wherein the first warning means and the second warning means give a warning by displaying on the display means or by vibrating the vibrating means. is there.

The present invention according to claim 6 is a recording means for recording a sound emitted by a diagnosis target, a reception means for receiving an operation from a user, and when the reception means receives an operation, a predetermined time before and after including the time when the operation is received. An acquisition means for acquiring time recording data as diagnostic data, a warning means for warning that the recording means has started recording before the reception of an operation by the reception means, and a diagnostic means acquired by the acquisition means. It is a diagnostic system having an estimation means for estimating the cause of sound generation based on data.

The present invention according to claim 7 is a recording means for recording a sound emitted by a diagnosis target, a reception means for receiving an operation from a user, and when the reception means receives an operation, a predetermined time before and after including the time when the operation is received. An acquisition means for acquiring time recording data as diagnostic data, a first warning means for warning that the recording means has started recording, and a sound recording for which the recording means is used as diagnostic data have started. This is a diagnostic system having a second warning means for warning the sound, and an estimation means for estimating the cause of sound generation based on the diagnostic data acquired by the acquisition means.

The present invention according to claim 8 is a recording means for recording a sound emitted by a diagnosis target, a reception means for receiving an operation from a user, and when the reception means receives an operation, recording for a predetermined time after receiving the operation. An acquisition means for acquiring data as diagnostic data, a first warning means for warning that recording by the recording means is possible, and recording of a sound used by the acquisition means as diagnostic data have been started. It is a diagnostic system including a second warning means for warning the fact, and an estimation means for estimating the cause of sound generation based on the diagnostic data acquired by the acquisition means.

The present invention according to claim 9 includes a step of recording a sound emitted by a diagnosis target, a step of accepting an operation from a user, and when the receiving means accepts an operation, a predetermined time before and after including the time when the operation is accepted. This is a program for causing a computer to execute a step of acquiring recorded data as diagnostic data and a step of warning that the recording means has started recording before receiving an operation by the receiving means.

The present invention according to claim 10 includes a step of recording a sound emitted by a diagnosis target, a reception means for receiving an operation from a user, and when the reception means receives an operation, a predetermined time before and after including the time when the operation is received. A step of acquiring the recorded data of the above as diagnostic data, a step of warning that the recording means has started recording, and a step of warning that the recording means has started recording a sound used as diagnostic data. Is a program that causes a computer to execute.

According to the eleventh aspect of the present invention, a step of recording a sound emitted by a diagnosis target, a step of accepting an operation from a user, and when the receiving means accepts an operation, recording data for a predetermined time after receiving the operation is recorded. A step of acquiring as diagnostic data, a step of warning that recording by the recording means is possible, a step of warning that the acquisition means has started recording a sound used as diagnostic data, and a step of warning. Is a program that causes a computer to execute.

According to the first aspect of the present invention, unlike the case of warning that the recording is started only after the operation of the receiving means, the warning that the recording is performed even when the data is not acquired as diagnostic data is warned. It is possible to provide a diagnostic device that can be used.

According to the second aspect of the present invention, unlike the case where only the recording of the sound used as the diagnostic data is warned, the warning is made even if the sound is not acquired as the diagnostic data. It is possible to provide a diagnostic device that can be used.

According to the third aspect of the present invention, there is provided a diagnostic device capable of warning that a recording is possible, unlike the case where a warning is given only for recording a sound used as diagnostic data. The purpose is to do.

According to the fourth aspect of the present invention, it is possible to provide a diagnostic device capable of distinguishing the second warning from the first warning.

According to the fifth aspect of the present invention, it is possible to provide a diagnostic device capable of preventing the diagnostic data from being mixed with the warning sound, which may occur when a warning is given by the warning sound.

According to the sixth aspect of the present invention, unlike the case of warning that the recording is started only after the operation of the receiving means, the warning that the recording is performed even when the data is not acquired as diagnostic data is warned. It is possible to provide a diagnostic system that can be used.

According to the seventh aspect of the present invention, unlike the case where only the recording of the sound used as the diagnostic data is warned, the warning is made even if the sound is not acquired as the diagnostic data. It is possible to provide a diagnostic system that can be used.

According to the eighth aspect of the present invention, there is provided a diagnostic system capable of warning that recording is possible, unlike the case where only the recording of sound used as diagnostic data is warned. The purpose is to do.

According to the ninth aspect of the present invention, unlike the case of warning that the recording is started only after the operation of the receiving means, the warning that the recording is performed even when the data is not acquired as diagnostic data is warned. It is possible to provide a program that can be done.

According to the tenth aspect of the present invention, unlike the case where only the recording of the sound used as the diagnostic data is warned, the warning is made even if the sound is not acquired as the diagnostic data. It is possible to provide a program that can be done.

According to the eleventh aspect of the present invention, there is provided a program capable of warning that a recording is possible, unlike the case where a warning is given only for recording a sound used as diagnostic data. The purpose is.

It is a system diagram which shows the structure of the diagnostic system which concerns on 1st Embodiment of this invention. FIG. 5 is a cross-sectional view of an image forming apparatus to be diagnosed by the diagnostic system shown in FIG. It is a block diagram which shows the hardware configuration of the diagnostic apparatus which the diagnostic system shown in FIG. 1 has. It is a block diagram which shows the functional structure of the diagnostic apparatus shown in FIG. It is a block diagram which shows the functional structure of the server apparatus which the diagnostic system shown in FIG. 1 has. It is a figure which shows an example of the information stored in the waveform data storage part which the server apparatus shown in FIG. 5 has. It is a sequence chart for demonstrating the operation of the diagnostic system shown in FIG. It is a figure for demonstrating the concept of STFT. It is a figure which shows the image example of the frequency spectrum waveform based on the analysis result obtained by the FTFT. It is a figure which shows an example of the selection area selected by the user in the image example of the frequency spectrum waveform of FIG. It is a figure which shows the analysis result example of the fast Fourier transform. FIG. 3 is a diagram showing a state in which two frequency spectrum waveforms are displayed on a display device included in the diagnostic device shown in FIG. It is a flowchart which shows the operation flow for acquiring the diagnostic data in the diagnostic system shown in FIG. It is a figure which shows the display in the recording mode of the display device which the diagnostic apparatus shown in FIG. 3 has. It is a figure explaining the recording time for acquiring the diagnostic data in the diagnostic system shown in FIG. 1, and also explaining the timing at which the first warning is given and the timing at which the second warning is given. It is a figure which shows the relationship between the recording time and the analysis accuracy. It is a figure which shows the relationship between the analysis time and the communication time with respect to the recording time. It is a flowchart which shows the operation flow for acquiring the diagnostic data in the diagnostic system which concerns on 2nd Embodiment. It is a figure which shows the display in the recording mode of the display device which the diagnostic apparatus which concerns on 2nd Embodiment has. It is a figure explaining the recording time for acquiring the diagnostic data in the diagnostic system which concerns on 2nd Embodiment, and also explaining the timing when the 1st warning is given, and the timing when the 2nd warning is given. ..

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a diagnostic system 1 according to a first embodiment of the present invention.

As shown in FIG. 1, the diagnostic system 1 is composed of, for example, a portable diagnostic device 10 such as a personal computer, a smartphone, a tablet terminal device, and a server device 50, and includes an image forming device 200 and the like. It is used to diagnose the object to be diagnosed.

The present invention can be applied to any device as long as the diagnostic device 10 can be connected to the server device 50 via a communication network. However, in the present embodiment, the case where the diagnostic device 10 is a device such as a microphone capable of acquiring a sound signal and a tablet terminal device provided with a touch panel capable of touch input will be described.

The diagnostic device 10 is carried by, for example, a serviceman (maintenance personnel) who performs maintenance management, repair, etc. of the image forming device 200 such as a printer used by the end user, and receives a sound signal generated in the image forming device 200. It is used to acquire and analyze the frequency of the acquired sound signal, and to display the frequency analysis result waveform of the past sound signal acquired from the server device 50 and the frequency analysis result waveform of the acquired sound signal. To.

The diagnostic device 10 and the server device 50 are connected to each other via a wireless LAN terminal 30 such as a Wi-Fi router, an Internet communication network 40, or the like to transmit and receive information.

When the diagnostic device 10 is a mobile phone device, a smartphone, or the like, it is also possible to connect the diagnostic device 10 and the server device 50 via a mobile phone network so that defect information can be transmitted and received.

In the diagnostic system 1, when an abnormal noise is generated in the image forming apparatus 200 which is the target electronic device installed at the end user's place and is the diagnostic target, the serviceman carries the diagnostic apparatus 10 and the image forming apparatus 200. Go to the place. Then, the serviceman acquires the sound signal by recording the sound generated by using the diagnostic device 10, and makes a diagnosis to identify the cause of the abnormal noise. Here, the abnormal noise is a sound that is not generated when the diagnosis target of the image forming apparatus 200 or the like is in a normal state, but is emitted when a defect such as a failure occurs in the diagnosis target.

Although it is technically possible to provide the image forming apparatus 200 with a microphone or the like to have a recording function and record the abnormal sound by the recording function when an abnormal sound is generated, the image forming apparatus 200 can be used. When installed in an end user's office or the like, providing the image forming apparatus 200 with a function of recording a voice cannot be realized for security reasons such as leakage of confidential information.

FIG. 2 is a schematic cross-sectional view showing the image forming apparatus 200. The image forming apparatus 200 includes a user interface (UI) apparatus 201, an image forming apparatus main body 202, and an image reading apparatus 203.

The UI device 201 is a device including a display device for displaying information and an input receiving device for receiving input made by an operator, and is composed of, for example, a touch panel or the like. For example, an operator such as an end user or a serviceman can input operation setting information via the UI device 201.

The image forming apparatus main body 202 has, for example, a three-stage recording medium supply cassette 204, and each of these recording medium supply cassettes 204 is provided with a supply head 205.

When one of the recording medium supply cassettes 204 is selected, the supply head 205 is operated to supply the selected recording medium supply cassette 204 to the image forming unit 207 via the recording medium supply path 206.

The image forming unit 207 is provided with yellow, magenta, cyan, and black photoconductors 208, and is provided with an intermediate transfer belt 209.

In addition to the exposure device 210, a charging device, a developing device, a primary transfer device, a cleaning device, and the like (not shown) are arranged around each photoconductor 208, and a toner image formed on each photoconductor 208 is intermediate. It is transferred to the transfer belt 209. The exposure apparatus 210 is composed of an LED and a laser light emitting device, has an output resolution of, for example, 600 dpi, and the amount of light can be adjusted for each dot.

The toner image of the intermediate transfer belt 209 is transferred to the transmitted recording medium by the secondary transfer roll 211 and fixed by the fixing device 212, and the recording medium on which the toner image is fixed passes through the recording medium discharge path 213. Is discharged to the discharge unit 214.

When double-sided printing is set, the recording medium whose surface is fixed by the fixing device 212 is sent from the recording medium discharge path 213 to the reversing device 215, inverted by the reversing device 215, and sent to the recording medium reversing path 216. Then, the image is returned to the recording medium supply path 206 and sent to the image forming unit 207 to print the back surface.

The image reading device 203 includes a document supply unit 217 to which the document is supplied, a document image reading unit 218 to read the original image, a document feeding device 219 to send the document from the document supply unit 217 to the image reading unit 218, and a document. It is provided with a document ejection unit 220 that ejects a document whose image has been read by the image scanning unit 218.

The image forming unit 207, the recording medium supply path 206, the recording medium discharge path 213, the recording medium inversion path 216, the fixing device 212, and the image reading device 203 are provided with a large number of rotating bodies such as transfer rollers.

In such an image forming apparatus 200, the paper feed rate is generally about 100 to 350 mm / sec. The largest diameter of the rotating body is the photoconductor 208, and the largest one is about φ30 mm.

FIG. 3 shows the hardware configuration of the diagnostic device 10. As shown in FIG. 3, the diagnostic device 10 wirelessly communicates with the CPU 11, the memory 12 capable of temporarily storing data, the storage device 13 such as a flash memory, and the wireless LAN terminal 30 (see FIG. 1). It is used as a wireless LAN interface (IF) 14 for transmitting and receiving data, for example, an input device 15 such as a touch sensor, a display device 16, a microphone 17 used as a recording means, and a sounding means for emitting sound. The speaker 18 and the diagnostic device 10 have a vibration generating element 19 used as a vibration generating means for generating vibration. These components are connected to each other via a control bus 20.

The diagnostic device 10 is provided with a touch panel on the display device 16 in which a touch sensor for detecting a touch position is provided as an input device 15, and the touch panel is used for display and input from the user. It is said.

The CPU 11 controls the operation of the diagnostic device 10 by executing a predetermined process based on the control program stored in the memory 12 or the storage device 13. This control program can also be obtained by downloading via the Internet communication network 40 or the mobile phone line network and provided to the CPU 11, and the program is stored in a storage medium such as a CD-ROM. It is also possible to provide it to the CPU 11.

The display device 16 displays various data, displays a frequency spectrum waveform described later, and displays, for example, various warnings. The speaker 18 emits various sounds, for example, a warning sound. The vibration generating element 19 vibrates, for example, to issue a warning.

The diagnostic device 10 of the present embodiment performs the operation as described below by executing the above-mentioned control program, and assists the serviceman in the work of identifying the cause of the abnormal noise.

FIG. 4 is a block diagram showing a functional configuration of the diagnostic apparatus 10 realized by executing the above-mentioned control program.

As shown in FIG. 4, the diagnostic device 10 of the present embodiment includes a diagnostic data acquisition unit 31, a frequency analysis unit 32, a control unit 33, a sound data storage unit 34, a display unit 35, and a communication unit. 36, a sound reproduction unit 37, a first warning unit 38, and a second warning unit 39 are provided.

The display unit 35 displays various data based on the control by the control unit 33. The communication unit 36 communicates with the server device 50, which is an external device. The sound reproduction unit 37 reproduces the recorded sound data or the like and converts it into a sound signal based on the control by the control unit 33.

The diagnostic data acquisition unit 31 is used as an acquisition means, and inputs the sound generated by the image forming apparatus 200, which is the device to be analyzed, to acquire the diagnostic data. The diagnostic data acquisition unit 31 will be described in detail later.

The frequency analysis unit 32 performs time-frequency analysis (time-dependent frequency analysis) of the diagnostic signal acquired by the diagnostic data acquisition unit 31, and determines the time change of the signal intensity distribution for each frequency of the acquired diagnostic signal. The represented frequency spectrum waveform (waveform of the first frequency analysis result) data is generated.

Specifically, the frequency analysis unit 32 generates frequency spectrum waveform data by performing a STFT (Short time Fourier transform) on the sound signal acquired by the diagnostic data acquisition unit 31.

The control unit 33 stores the frequency spectrum waveform data obtained by the frequency analysis unit 32 in the sound data storage unit 34 together with the sound data.

Further, the control unit 33 performs a fast Fourier transform (1D-FFT) that performs frequency analysis in the time axis direction on a frequency component estimated to be an abnormal sound in the frequency spectrum waveform data obtained by the frequency analysis unit 32. (Fast Fourier Transform)) is instructed to the frequency analysis unit 32. The fast Fourier transform is equivalent to the autocorrelation transform, and the fast Fourier transform can be replaced by the autocorrelation transform.

Here, the control unit 33 may extract a signal component having periodicity from the frequency spectrum waveform data and select the signal component as a signal component having a high possibility of being an abnormal sound. .. Further, the control unit 33 displays the obtained frequency spectrum waveform data on the display unit 35, and specifies a frequency component that is likely to be an abnormal sound by the user who sees the frequency spectrum waveform, thereby that frequency. The component may be selected as a signal component that is likely to be an abnormal sound.

Then, the frequency analysis unit 32 performs a fast Fourier transform in the time axis direction on the frequency component presumed to be an abnormal sound based on the instruction by the control unit 33.

Then, the control unit 33 acquires information on the period and frequency of the abnormal sound from the analysis result of the fast Fourier transform by the frequency analysis unit 32.

Further, the control unit 33 uses the acquired abnormal noise cycle and frequency information together with the model information such as the model name and serial number of the image forming apparatus 200 and the operating state information indicating the operating state of the image forming apparatus 200 as well as the communication unit 36. Is transmitted to the server device 50 via. Specifically, this operation status information includes information such as whether it is color printing or black-and-white printing, double-sided printing or single-sided printing, whether the operation mode is scan, print, or copy, and the type of paper used. Can be included. In this way, the control unit 33 transmits the information obtained from the frequency spectrum waveform data obtained by the frequency analysis unit 32 to the server device 50 via the communication unit 36.

The first warning unit 38 and the second warning unit 39 each give a warning based on the control by the control unit 33. More specifically, each of the first warning unit 38 and the second warning unit 39 causes the display device 16 to display a warning or the speaker 18 to emit a warning sound based on the control by the control unit 33. , The vibration generating element 19 is vibrated. Details of the first warning unit 38 and the second warning unit 39 will be described later.

The server device 50 has acquired the original sound data and the sound data of the spectral waveform data obtained by performing frequency analysis of the sound signal of the abnormal sound generated in the past in a device equivalent to the device of the image forming device 200. It stores information such as the operating status of the device, the cause of abnormal noise, and how to deal with abnormal noise.

Then, the server device 50 has a frequency spectrum waveform (second) corresponding to the frequency spectrum waveform data obtained as a result of the frequency analysis by the frequency analysis unit 32 from the information on the period and frequency of the abnormal sound transmitted from the diagnostic device 10. The frequency analysis result waveform) data is searched, and the found frequency spectrum waveform data is transmitted to the diagnostic apparatus 10 together with information such as sound data stored as a sample waveform data of abnormal sound.

As a result, the control unit 33 receives the frequency spectrum waveform data corresponding to the frequency spectrum waveform data obtained as a result of the frequency analysis by the frequency analysis unit 32 from the server device 50 via the communication unit 36.

The control unit 33 displays the frequency spectrum waveform obtained by frequency analysis of the sound signal acquired by the diagnostic data acquisition unit 31 and the spectrum waveform received from the server device 50 in parallel on the display unit 35. Control.

At this time, the control unit 33 has at least one of the frequency spectrum waveform obtained by performing frequency analysis of the sound signal acquired by the diagnostic data acquisition unit 31 and the frequency spectrum waveform transmitted from the server device 50. The display position in the time axis direction on one side is changed based on the operation of the user (user).

The control unit 33 has a frequency spectrum waveform obtained by performing frequency analysis of the diagnostic data acquired by the diagnostic data acquisition unit 31, and a periodic waveform in the frequency spectrum waveform transmitted from the server device 50. The display position in the time axis direction in at least one of the two frequency spectrum waveforms may be changed so that the positions match.

The waveform of either one of the frequency spectrum waveform obtained by performing frequency analysis of the diagnostic data acquired by the diagnostic data acquisition unit 31 and the frequency spectrum waveform transmitted from the server device 50 is It is set to have a longer waveform than the other waveform.

As an example, in the present embodiment, the frequency spectrum waveform obtained by performing frequency analysis of the diagnostic data acquired by the diagnostic data acquisition unit 31 is data for about 4 to 16 seconds, and is a server. The frequency spectrum waveform transmitted from the device 50 is data for about 8 seconds.

Further, when there are a plurality of frequency spectrum waveform data transmitted from the server device 50, the control unit 33 may use the frequency spectrum waveform data obtained by the frequency analysis of the frequency analysis unit 32 among the plurality of frequency spectrum waveform data. The display unit 35 is displayed with priority given to those having a high degree of similarity.

Further, the control unit 33 has either one of the frequency spectrum waveform obtained by performing frequency analysis of the sound signal acquired by the diagnostic data acquisition unit 31 and the frequency spectrum waveform transmitted from the server device 50. When one of the waveforms in the above is enlarged or reduced, the other waveform is enlarged or reduced so as to have the same size and displayed.

Further, the control unit 33 is the image forming apparatus when the process speed (image forming speed) of the image forming apparatus 200 when the sound waveform is acquired and the frequency spectrum waveform transmitted from the server apparatus 50 are acquired. If the process speeds are different from each other, the length of the frequency spectrum waveform transmitted from the server device 50 in the time axis direction may be expanded or contracted and displayed based on these two process speeds.

This is because the period of abnormal noise generated changes as the process speed changes, so it is not possible to make a correct comparison by comparing them as they are. In addition, acquiring and preparing diagnostic data for each of a plurality of process speeds increases the amount of data and also increases the time and effort required to acquire diagnostic data.

When the user instructs to reproduce the sound data, the sound reproduction unit 37 transmits the sound data acquired by the diagnostic data acquisition unit 31 and the server device 50 based on the control from the control unit 33. The sound data corresponding to the frequency spectrum waveform may be reproduced as a left signal and a right signal for stereo reproduction, respectively.

Further, in order to facilitate the comparison of the two frequency spectrum waveforms, the control unit 33 has an adjustable frequency auxiliary line indicating the same frequency on the two frequency spectrum waveforms displayed in parallel, and a time axis direction. Adjustable common time axis auxiliary lines for comparing the positions of the may be superimposed and displayed.

FIG. 5 is a block diagram showing a functional configuration of the server device 50, and FIG. 6 is a diagram showing information stored in the waveform data storage unit 53 of the server device 50. As shown in FIG. 5, the server device 50 of the present embodiment includes a communication unit 51, a control unit 52, and a waveform data storage unit 53.

The waveform data storage unit 53 stores a plurality of frequency spectrum waveform data obtained by performing frequency analysis of abnormal sounds generated in the past in a device equivalent to the image forming device 200, which is the device to be analyzed.

Specifically, as shown in FIG. 6, the waveform data storage unit 53 includes frequency spectrum waveform data obtained by time-frequency analysis of sound data acquired in advance, original sound data, and sound data. Information such as the cause of abnormal noise and how to deal with it is stored for each model.

Then, when the control unit 52 receives the information on the period and frequency of the abnormal sound from the diagnostic device 10, the abnormal sound period received from the waveform data of the plurality of frequency spectra stored in the waveform data storage unit 53. Based on the information on the frequency and frequency, the one similar to the waveform data of the frequency spectrum based on the abnormal sound acquired by the diagnostic device 10 is selected and transmitted to the diagnostic device 10 via the communication unit 51.

In the present embodiment, the diagnostic device 10 performs the SFTT and the fast Fourier transform of the abnormal sound data, and transmits the information on the period and frequency of the abnormal sound to the server device 50. Both the Fourier transform, the STFT, and the fast Fourier transform may be executed on the server device 50 side.

In this case, the sound data is transmitted from the diagnostic device 10 to the server device 50 as it is, or the frequency spectrum waveform data as a result of performing the SFT on the sound data is transmitted, and the server device 50 transmits the SFTT for the sound data. Or perform a fast Fourier transform.

FIG. 7 is a sequence chart showing the operation of the diagnostic system 1 of the present embodiment, FIG. 8 is a diagram for explaining the concept of the FTFT made by, for example, the diagnostic system 1, and FIG. 9 is a diagram for explaining the concept of the FTFT made by the diagnostic system 1. It is a figure which shows the image example of the frequency spectrum waveform based on the analysis result obtained by the FTFT.

As shown in FIG. 7, when the diagnostic apparatus 10 intends to perform a diagnosis for identifying the cause of abnormal noise, various information such as a model name, a serial number, and an operating state are input (step S10).

Then, in the diagnostic device 10, the operation mode is set to the recording mode, the microphone 17 is brought close to the abnormal noise generation portion of the image forming device 200, recording is performed, and diagnostic data is acquired (step S100). This step S100 will be described in detail later.

In the diagnostic apparatus 10, the acquired sound data is settled by the frequency analysis unit 32 to generate a frequency spectrum waveform representing the time change of the signal intensity distribution for each frequency (step S202).

Here, as shown in FIG. 8, the STFT is obtained by performing a Fourier transform every short time and calculating the signal intensity for each frequency component according to the time change. FIG. 9 shows an example of a waveform when the analysis result obtained by the FTFT is used as an image of one frequency spectrum waveform.

In the frequency spectrum waveform example shown in FIG. 9, the horizontal axis represents time and the vertical axis represents frequency, and the intensity of each frequency is represented by color. In FIG. 9, this difference in color is represented by a hatching pattern. Further, although FIG. 9 illustrates a case where the intensity for each frequency is expressed by color, it is also possible to express this intensity by gradation.

In the frequency spectrum waveform example of FIG. 9, it can be seen that the frequency component 61 of the abnormal sound is periodically generated at a specific frequency. In the frequency spectrum waveform example shown in FIG. 9, the low frequency component is a normal operating sound and is not a frequency component of an abnormal sound.

When the frequency spectrum waveform as shown in FIG. 9 is obtained, the control unit 33 causes the display unit 35 to display the frequency spectrum waveform. Then, the user presented with the frequency spectrum waveform identifies the frequency component 61 of the abnormal sound, and selects a region including the frequency component 61 of the abnormal sound by, for example, operating the touch panel.

FIG. 10 shows an example of the selection area 80 selected by the user in this way. In the example shown in FIG. 10, it can be seen that a rectangular region including a plurality of abnormal sound frequency components 61 is designated as the selection region 80.

Then, when the selection region 80 is designated in this way, the fast Fourier transform (1D-FFT) for the frequency component included in the selection region 80 is executed by the frequency analysis unit 32 (step S204). An example of the analysis result of the fast Fourier transform executed in this way is shown in FIG.

In FIG. 11, the period and frequency of the abnormal sound are specified by detecting the period and frequency of the signal of the frequency component subjected to the fast Fourier transform. Since the abnormal sound contains harmonic components and the like, a plurality of cycles may be detected, but the cycle having the strongest signal strength is detected as the abnormal sound cycle.

Further, since a signal component having a long period of a predetermined period or longer is considered to be a normal operation sound or an indefinite period noise, such a long period signal component area is set as a judgment exclusion area 62 in the judgment exclusion area 62. The analysis result is ignored.

Further, since the low frequency signal component below the predetermined frequency is also indistinguishable from the normal operating sound, the region of such a low frequency signal component is set as the judgment exclusion region 63, and the analysis result in this judgment exclusion region 63 is It will be ignored.

The diagnostic device 10 transmits information on the frequency and period of abnormal noise to the server device 50 together with model information and operating state information based on the analysis result of the fast Fourier transform (step S206). For example, information such that the abnormal sound frequency is 4 kHz and the abnormal sound period is 2.0 seconds is transmitted to the server device 50.

Then, the server device 50 extracts the frequency spectrum waveform data corresponding to the received information by searching the waveform data storage unit 53 based on the received information (step S208).

Then, the server device 50 transmits the extracted frequency spectrum waveform data to the diagnostic device 10 together with information such as the original sound data, the cause of the abnormal sound, and the coping method thereof (step S210).

Then, the diagnostic device 10 receives the frequency spectrum waveform data transmitted from the server device 50 (step S212). Then, the control unit 33 of the diagnostic apparatus 10 displays the received frequency spectrum waveform and the frequency spectrum waveform obtained by the FTFT on the display unit 35 (step S214).

FIG. 12 shows a screen example of the diagnostic apparatus 10 in which the two frequency spectrum waveforms are displayed in this way.

In the screen example shown in FIG. 12, the frequency spectrum waveform obtained by the STFT in the frequency analysis unit 32 is displayed as the "analysis result waveform of the abnormal sound recorded this time", and the frequency spectrum waveform transmitted from the server device 50. However, it can be seen that it is displayed as "past sound data" together with the cause of abnormal noise such as "wear of the photoconductor drum".

A serviceman who intends to make a diagnosis identifies the cause of the abnormal noise by comparing the two frequency spectrum waveforms and determining whether or not the abnormal noise components in the waveform are similar.

Next, the operation of the diagnostic apparatus 10 such as acquisition of diagnostic data (see step S100 in FIG. 7) will be described. FIG. 13 is a flowchart showing the operation of the diagnostic device 10.

When the operator sets the diagnostic device 10 to the recording mode, the control unit 33 controls the display unit 35 so that the display device 16 displays the recording screen shown in FIG. 14 in step S110. As shown in FIG. 14, the recording screen displays a sound display unit 90 indicating the strength of the sound to be recorded on the time axis, a recording start button 91, and a recording end button 92.

The recording start button 91 is used as a receiving means for receiving an operation from the user, and when the recording start button 91 is operated by the operator, the control unit 33 starts recording by the microphone 17. The recording end button 92 is used as a receiving means for receiving an operation from the user, and when the recording end button 92 is operated by the operator, the control unit 33 ends the recording by the microphone 17. As will be described later, the recording by the microphone 17 ends after the time T2 has elapsed from the time when the recording end button 92 is operated (see FIG. 15).

When it is confirmed that the operation for starting recording has been performed in the next step S112, in the next step S114, the control unit 33 controls the first warning unit 38, and the first warning unit 38 records. Warn that it has started. More specifically, the control unit 33 controls the first warning unit 38 to cause the display device 16 to display a warning, the speaker 18 to emit a warning sound, and the vibration generating element 19 to make a diagnostic device. 10 is vibrated.

In the next step S116, the control unit 33 causes recording. That is, the control unit 33 causes the sound from the microphone 17 to be recorded in the memory 12 or the like.

After confirming that the predetermined time T1 has elapsed in the next step S118, in the next step S120, the control unit 33 erases the sound data recorded before the predetermined time T1. In this way, by the control by the control unit 33, the memory 12 and the like are kept in a state in which the sound data recorded after the time T1 predetermined from the present time is recorded.

In the next step S122, the control unit 33 determines whether or not the recording end operation has been performed, that is, whether or not the recording end button 92 used as the reception means for receiving the operation from the user has been operated. The operation of ending recording is performed by a serviceman who intends to make a diagnosis, for example, listening to a sound through a microphone 17 and pressing the recording end button 92 at the timing when an abnormal noise is generated.

As will be described later, when the recording end button 92 receives an operation to end recording, the diagnostic data acquisition unit 31 acquires the recorded sound as diagnostic data. Therefore, if it is determined in step S122 that the operation to end the recording has been accepted, in the next step S124, the control unit 33 sends the second warning unit 39 to the diagnostic data acquisition unit 31. Warns that the acquisition of diagnostic data has started.

More specifically, the control unit 33 controls the second warning unit 39 to cause the display device 16 to display a warning, the speaker 18 to emit a warning sound, and the vibration generating element 19 to make a diagnostic device. 10 is vibrated. The second warning in step S124 is different from the first warning in step S114, and can be distinguished from the first warning.

For example, when a warning is displayed on the display device 16 as a second warning, the display is different from the display in the first warning, and when the speaker 18 emits a warning sound as a second warning, the warning sound is the second warning. It is different from the warning sound in the warning of 1. Further, as a first warning, a warning sound is generated in the speaker 18, a vibration generating element 19 vibrates the diagnostic device 10 as a second warning, and a vibration generating element 19 vibrates the diagnostic device 10 as a first warning. , The display device 16 may display a warning as a second warning.

Further, if the first warning unit 38 and the second warning unit 39 give a warning by displaying on the display device 16 or by vibrating by the vibration generating element 19, it is not necessary to generate a warning sound and recording is performed. Warning sounds are prevented from being added to the diagnostic data.

In step S126, the control unit 33 terminates the first warning initiated in step S114. The first warning is stopped at the timing when it is determined that the operation to end the recording is accepted in step S122, that is, at the same time as the start of the second warning in step S124.

If it is determined in step S122 that the operation to end the recording has been accepted, the recording is not stopped immediately, and in step S128, the control unit 33 continues the recording.

In the next step S130, the control unit 33 determines whether or not a predetermined time T2 has elapsed since receiving the operation of ending recording, and returns to step S128 until the predetermined time T2 elapses. If it is determined that the predetermined time T2 has elapsed, the process proceeds to step S132 to end the recording.

In the next step S134, the control unit 33 ends the second warning started in step S124.

In the next step S136, the control unit 33 causes the diagnostic data acquisition unit 31 to acquire diagnostic data. More specifically, as shown in FIG. 15, the control unit 33 diagnoses the total time T3 = T1 + T2 of the time T1 before the recording end operation reception and the time T2 after the recording end operation reception as diagnostic data. The data acquisition unit 31 is used to acquire the data. Since the serviceman hears the abnormal noise from the microphone 17 and immediately presses the recording end button 92, the abnormal noise heard by the serviceman is surely acquired by including the time T1 before the recording end signal. Further, by appropriately setting the total time T3, periodic abnormal noises are acquired as diagnostic data. Here, T1 = T2 may be set, and T1 and T2 may be different from each other.

In FIG. 15, the timing at which the first warning unit 38 gives the first warning and the second warning unit 39 are shown together with the timing at which the diagnostic data acquisition unit 31 acquires the diagnostic data for the total time T3. The timing of issuing the second warning is indicated.

As described above, in the general image forming apparatus 200, the paper feed rate is about 100 to 350 mm / sec, and the photoconductor 208 having the largest diameter among the rotating bodies is about φ30 mm, so that the image forming apparatus 200 emits the sound. The period of abnormal noise is about 1 second at the maximum. Therefore, in order to record a periodic abnormal sound, diagnostic data for the time required for the photoconductor 208 to rotate twice is required, and the total time T3 is 2 seconds or more.

Further, in order to perform the time change analysis of the SFTT and the like described above, apply 1D-FFT on the time axis on the result screen, and calculate the abnormal sound period, diagnostic data for the time required for the photoconductor 208 to rotate four times is required. , The total time T3 is 4 seconds or more. For example, T1 = 4 seconds and T2 = 4 seconds can be set.

Here, as shown in FIG. 16, the analysis accuracy of the abnormal sound cycle increases sharply while the recording time, which is the source of the diagnostic data, is short, but approaches saturation when the recording time becomes long to some extent.

On the other hand, as shown in FIG. 17, the time required for SFTT analysis and the like becomes longer in proportion to the recording time, and the communication time when transmitting to an external server also becomes longer.

As described above, the recording time is preferably in the range of 4 seconds to 16 seconds from the viewpoint of the balance between the analysis accuracy and the working time.

In the above embodiment, the case where the diagnostic device 10 is a tablet terminal device has been described, but the present invention is not limited to this, and the present invention is not limited to the case where another device is used as the diagnostic device. Can be applied. For example, when the operation panel of the image forming apparatus 200 is detachable from the main body and can communicate with the server apparatus 50 and has a built-in sound signal acquisition function, this operation panel is used as a diagnostic apparatus. You may try to.

Further, in the above embodiment, the case where the diagnostic device 10 has a built-in microphone 17 is described. However, if the diagnostic device 10 is provided with a sound recording function, a sound collecting device such as a microphone is externally provided. The sound signal acquisition means may be realized by connecting to.

Further, in the above embodiment, the case where the target device for the abnormal sound analysis is an image forming device is described, but the device to be the target of the abnormal sound analysis is not limited to the image forming device and is not limited to the image forming device. The present invention can be similarly applied to other devices as long as they are devices that may generate abnormal noises.

According to the diagnostic system 1 according to the first embodiment described above, the first warning unit 38 warns that recording has started, and the second is that the acquisition of diagnostic data has started. Since the warning unit 39 warns, it is possible to call attention to the operator and surrounding people, and the conversation etc. is inadvertently recorded or the conversation etc. is inadvertently acquired as diagnostic data. It is possible to prevent the leakage of confidential information due to the above.

Further, according to the diagnostic system 1 according to the first embodiment described above, the erasure may not be performed immediately, and the confidential information is more confidential than the recording that is erased after a predetermined time has elapsed. When the acquisition of diagnostic data, which is likely to cause leakage, is started, a second warning can be given again in addition to the first warning when recording is started.

Next, the diagnostic system 1 according to the second embodiment of the present invention will be described. In the first embodiment described above, when the recording start button 91 is operated, the diagnostic data acquisition unit 31 acquires recordings for a predetermined time before and after including the time when the recording start button 91 is operated as diagnostic data. On the other hand, in the diagnostic system 1 according to the second embodiment, when the recording start button 91 is operated, the diagnostic data acquisition unit 31 records the recording for a predetermined time after the operation as diagnostic data. Get as.

Further, in the diagnostic system 1 according to the first embodiment described above, the first warning unit 38 warns that recording with the microphone 17 has started. On the other hand, in the diagnostic system 1 according to the second embodiment, the first warning unit 38 warns that recording with the microphone 17 has become possible. In the following description, the difference between the diagnostic system 1 according to the second embodiment and the diagnostic system 1 according to the first embodiment will be described, and the first aspect of the diagnostic system 1 according to the second embodiment will be described. The description of the same part as that of the diagnostic system 1 according to the embodiment will be omitted.

FIG. 18 is a flowchart showing the operation of the diagnostic apparatus 10 according to the second embodiment. As shown in FIG. 18, in step S150, the control unit 33 starts the recording mode in response to, for example, an operation of the operator, and puts the diagnostic device 10 in a recordable state. More specifically, the display unit 35 is controlled so that the display device 16 displays the recording screen shown in FIG. When the recording screen is displayed, the operator can operate the recording start button 91 to record at any time. Here, the recording start button 91 is used as a reception means for receiving an operation to start recording by the microphone 17 which is a recording means.

In the next step S152, the control unit 33 controls the first warning unit 38 to notify the first warning unit 38 that the recording mode is set, that is, recording with the microphone 17 is possible. Make a warning. More specifically, the control unit 33 controls the first warning unit 38 to cause the display device 16 to display a warning, the speaker 18 to emit a warning sound, and the vibration generating element 19 to make a diagnostic device. 10 is vibrated.

When it is confirmed that the recording start operation has been performed in the next step S154, that is, when it is confirmed that the recording start button 91 has been operated by the operator, in step S156, the control unit 33 controls the second warning unit 39. Then, the second warning unit 39 is made to warn that the acquisition of the diagnostic data by the diagnostic data acquisition unit 31 has started. More specifically, the control unit 33 controls the second warning unit 39 to cause the display device 16 to display a warning, the speaker 18 to emit a warning sound, and the vibration generating element 19 to make a diagnostic device. 10 is vibrated.

The operation of starting recording in step S154 is performed by a serviceman who intends to perform diagnosis, for example, by pressing the recording end button 92 at the timing when an abnormal sound is generated while listening to the sound through the microphone 17. Further, the second warning in step S158 is different from the first warning in step S152, and can be distinguished from the first warning.

In the next step S158, the control unit 33 ends the first warning started in step S152. The first warning is stopped at the timing when it is determined that the operation to start recording is accepted in step S154, that is, at the same time as the start of the second warning in step S156.

In the next step S160, the control unit 33 causes recording. That is, the control unit 33 causes the sound from the microphone 17 to be recorded in the memory 12 or the like. The recording in step S160 is started at the timing when it is determined that the operation to start recording is accepted in step S154, that is, the start of the second warning in step S156 and the stop of the first warning in step S158. It is done at the same time.

In the next step S162, the control unit 33 determines whether or not a predetermined time T2 has elapsed since the recording start signal was received, and if it is determined that the predetermined time T2 has elapsed, the step S. Proceed to S164 to end the recording.

In the next step S166, the control unit 33 ends the second warning started in step S156.

In the next step S168, the control unit 33 causes the diagnostic data acquisition unit 31 to acquire diagnostic data. That is, as shown in FIG. 20, the control unit 33 causes the diagnostic data acquisition unit 31 to acquire the recording of the time T2 after the reception of the recording start operation as the diagnostic data. Since the serviceman hears the abnormal noise from the microphone 17 and immediately presses the recording start button 91, the periodic abnormal noise is acquired as diagnostic data by appropriately setting the time T2.

In FIG. 20, the timing at which the first warning unit 38 gives the first warning and the second warning unit 39 are the second, together with the timing at which the diagnostic data acquisition unit 31 acquires the diagnostic data at time T2. The timing to give the warning of 2 is shown.

According to the diagnostic system 1 according to the second embodiment described above, the first warning unit 38 warns that recording is possible, and the diagnostic data is being acquired. Since the warning unit 39 of 2 warns, it is possible to call attention to the operator and surrounding people, and the conversation or the like is inadvertently recorded or the conversation or the like is inadvertently acquired as diagnostic data. By doing so, it is possible to prevent leakage of confidential information.

1 ... Diagnostic system 10 ... Diagnostic device 13 ... Storage device 15 ... Input device 17 ... Microphone 31 ... Diagnostic data acquisition unit 33 ... Control unit 34 ... Sound data Storage unit 38 ・ ・ ・ 1st warning unit 39 ・ ・ ・ 2nd warning unit 50 ・ ・ ・ Server device 52 ・ ・ ・ Control unit 53 ・ ・ ・ Wave data storage unit 91 ・ ・ ・ Recording start button 92 ・ ・ ・・ Recording end button 200 ・ ・ ・ Image forming device

Claims (11)

A recording means for recording the sound emitted by the diagnosis target,
A reception means that accepts operations from users,
When the reception means receives the instruction to end recording, the acquisition means for acquiring the recording data for a predetermined time before and after the reception, as diagnostic data,
Before receiving the instruction to end recording by the receiving means, a warning means for warning that the recording means has started recording, and a warning means.
After receiving the recording start instruction from the user by the reception means, after a predetermined time has elapsed, it is controlled to determine whether or not the recording end instruction is given by the user by the reception means. Control means and
Diagnostic device with. A recording means for recording the sound emitted by the diagnosis target,
A reception means that accepts operations from users,
When the reception means receives the instruction to end recording, the acquisition means for acquiring the recording data for a predetermined time before and after the reception, as diagnostic data,
A first warning means for warning that the recording means has started recording, and
A second warning means for warning that the recording means has started recording a sound used as diagnostic data, and
After receiving the recording start instruction from the user by the reception means, after a predetermined time has elapsed, it is controlled to determine whether or not the recording end instruction is given by the user by the reception means. Control means and
Diagnostic device with. A recording means for recording the sound emitted by the diagnosis target,
A reception means that accepts operations from users,
When the reception means receives the instruction to end recording, the acquisition means for acquiring the recording data for a predetermined time after receiving the instruction as diagnostic data, and
The first warning means for warning that recording by the recording means is possible, and
A second warning means for warning that the acquisition means has started recording a sound used as diagnostic data, and
After receiving the recording start instruction from the user by the reception means, after a predetermined time has elapsed, it is controlled to determine whether or not the recording end instruction is given by the user by the reception means. Control means and
Diagnostic device with. The diagnostic device according to any one of claims 1 to 3, wherein the second warning means issues a warning of a means different from the first warning means. The diagnostic device according to any one of claims 1 to 4, wherein the first warning means and the second warning means give a warning by displaying on the display means or by vibrating the vibrating means. A recording means for recording the sound emitted by the diagnosis target,
A reception means that accepts operations from users,
When the reception means receives the instruction to end recording, the acquisition means for acquiring the recording data for a predetermined time before and after the reception, as diagnostic data,
Before receiving the instruction to end recording by the receiving means, a warning means for warning that the recording means has started recording, and a warning means.
After receiving the recording start instruction from the user by the reception means, after a predetermined time has elapsed, it is controlled to determine whether or not the recording end instruction is given by the user by the reception means. Control means and
An estimation means for estimating the cause of sound generation based on the diagnostic data acquired by the acquisition means, and an estimation means.
Diagnostic system with. A recording means for recording the sound emitted by the diagnosis target,
A reception means that accepts operations from users,
When the reception means receives the instruction to end recording, the acquisition means for acquiring the recording data for a predetermined time before and after the reception, as diagnostic data,
A first warning means for warning that the recording means has started recording, and
A second warning means for warning that the recording means has started recording a sound used as diagnostic data, and
After receiving the recording start instruction from the user by the reception means, after a predetermined time has elapsed, it is controlled to determine whether or not the recording end instruction is given by the user by the reception means. Control means and
An estimation means for estimating the cause of sound generation based on the diagnostic data acquired by the acquisition means, and an estimation means.
Diagnostic system with. A recording means for recording the sound emitted by the diagnosis target,
A reception means that accepts operations from users,
When the reception means receives the instruction to end recording, the acquisition means for acquiring the recording data for a predetermined time after receiving the instruction as diagnostic data, and
The first warning means for warning that recording by the recording means is possible, and
A second warning means for warning that the acquisition means has started recording a sound used as diagnostic data, and
After receiving the recording start instruction from the user by the reception means, after a predetermined time has elapsed, it is controlled to determine whether or not the recording end instruction is given by the user by the reception means. Control means and

An estimation means for estimating the cause of sound generation based on the diagnostic data acquired by the acquisition means, and an estimation means.
Diagnostic system with. Steps to record the sound emitted by the diagnostic target,
Steps to accept operations from users and
When the instruction to end recording is received, the step of acquiring the recording data for a predetermined time before and after the reception is received as diagnostic data, and
Before accepting the instruction to end recording, a step to warn that the recording means has started recording, and
A step of controlling to determine whether or not a recording end instruction has been given by the user after a predetermined time has elapsed after receiving the recording start instruction from the user.
A program that causes a computer to run. Steps to record the sound emitted by the diagnostic target,
Steps to accept operations from users and
When the instruction to end recording is received, the step of acquiring the recording data for a predetermined time before and after the reception is received as diagnostic data, and
A step to warn you that recording has started,
A step to warn you that you have started recording sound to be used as diagnostic data,
A step of controlling to determine whether or not the user has instructed the end of recording by the receiving means after a predetermined time has elapsed after receiving the instruction to start recording from the user.
A program that causes a computer to run. Steps to record the sound emitted by the diagnostic target,
Steps to accept operations from users and
When the instruction to end recording is received, the step of acquiring the recorded data for a predetermined time after receiving the instruction as diagnostic data, and
A step to warn you that recording is possible, and
A step to warn that recording of the sound used as pre-diagnosis data has started, and
A step of controlling to determine whether or not the user has instructed the end of recording by the receiving means after a predetermined time has elapsed after receiving the instruction to start recording from the user.
A program that causes a computer to run.

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