Sound source estimation system and sound source estimation method

Abstract

The present disclosure relates to a sound source estimation system and a sound source estimation method. The sound source estimation system includes a microphone that detects sound generated from an object including a rotating device, a rotation speed acquisition unit that acquires the rotation speed of the rotating device, a frequency analysis unit that generates frequency sound data representing a change in the spectrum of the sound detected by the microphone, an order calculation unit that calculates an order based on a maximum sound frequency representing the maximum sound among the frequencies of the sound and the rotation speed, and an order comparison unit that determines a component having an order closest to the order as a sound source candidate for noise.

Description

Technical Field

[0001] The present invention relates to a technique for estimating a sound source that generates sound or vibration as a rotating device installed in a vehicle rotates. Background Art

[0002] A rotating device that generates a rotational motion is installed in a vehicle. In addition, a plurality of components (such as gears that transmit the rotational motion) that move with the rotational motion are installed in the vehicle. When an abnormality such as a crack or deformation occurs in these components, noise that has not been generated before the occurrence of the abnormality may be generated with the rotational motion. Such noise may cause discomfort to the user of the vehicle. Therefore, in order to replace or repair the component that is the noise source, it is necessary to identify the component that is the noise source.

[0003] The degree of noise generated along with the rotational motion can be a degree unique to each component (hereinafter referred to as the component degree), which is determined by the specifications of the component (for example, the size of the gear when the component is a gear). The sound and vibration analysis device disclosed in Japanese Unexamined Patent Application Publication No. 2005-98984 (JP 2005-98984A) calculates the degree based on the frequency data and rotational speed data of the sound recorded while the vehicle is running. Since the calculated degree corresponds to the component degree of each gear of the transmission, it is possible to identify the gear that is the noise source by calculating the degree of the sound equal to or greater than a predetermined sound pressure in the sound recorded while the vehicle is running. Summary of the Invention

[0004] However, due to manufacturing errors and the like, there are individual differences among the plurality of components installed in the vehicle. Therefore, there may be a difference between the component degree determined by the specifications of the component and the degree of the sound actually generated by the component. In JP 2005-98984A, the component that is the noise source is identified based on the consideration that the degree of the sound equal to or greater than a predetermined sound pressure in the recorded sound matches the component degree of the noise source, without considering the individual differences of the components. Therefore, it may not be possible to accurately identify the noise source.

[0005] According to the solution of the present invention, a sound source estimation system is provided, including: a sound and vibration acquisition unit configured to acquire sound generated from an object; a rotation speed acquisition unit configured to acquire the rotation speed of a rotating device installed in the object and generating a rotational motion; a frequency analysis unit configured to generate frequency sound data representing a change in the sound spectrum of the sound detected by the sound and vibration acquisition unit; an order calculation unit configured to calculate the order of the maximum sound frequency based on the maximum sound frequency and the rotation speed acquired by the rotation speed acquisition unit, the maximum sound frequency being the frequency of the maximum sound in the frequency sound data; a component order information acquisition unit configured to acquire order information of a plurality of components associated with the sound generated by the plurality of components installed in the object as the rotational motion occurs; an order comparison unit configured to determine, based on the order information acquired by the component order information acquisition unit, the component having the order closest to the order calculated by the order calculation unit as a sound source candidate for the noise; and an output unit configured to output information about the sound source candidate for the noise.

[0006] According to another solution of the present invention, a sound source estimation method is provided, including: a sound and vibration acquisition step for acquiring sound generated from an object; a rotation speed acquisition step for acquiring the rotation speed of a rotating device installed in the object and generating a rotational motion; a frequency analysis step for generating frequency sound data representing a change in the sound spectrum of the sound detected in the sound and vibration acquisition step; an order calculation step for calculating the order of the maximum sound frequency based on the maximum sound frequency and the rotation speed of the rotating device acquired in the rotation speed acquisition step, the maximum sound frequency being the frequency of the maximum sound in the frequency sound data generated in the frequency analysis step; a component order information acquisition step for acquiring order information of a plurality of components associated with the sound generated by the plurality of components installed in the object as the rotational motion occurs; an order comparison step for determining, based on the order information acquired in the component order information acquisition step, the component having the order closest to the order calculated in the order calculation step as a sound source candidate for the noise; and an output step for outputting information about the sound source candidate for the noise.

[0007] According to the present invention, the order is calculated based on the maximum sound pressure frequency in the frequency of the sound acquired by the sound and vibration acquisition unit and the rotation speed of the rotating device, and the component having the order closest to this order is determined as the sound source candidate. Therefore, even when there is a difference between the order representing the sound pressure equal to or greater than a predetermined value in the recorded sound and the component order determined by the specifications of the component serving as the noise sound source, the component serving as the sound source can be estimated. Description of the Drawings

[0008] Hereinafter, the features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described with reference to the accompanying drawings, in which like reference numerals denote like elements, where:

[0009] Figure 1 is a diagram showing a sound source estimation device including a sound source estimation system and a vehicle;

[0010] Figure 2 is a diagram showing the configuration of a sound source estimation device including a sound source estimation system;

[0011] Figure 3 is a diagram schematically showing a sound source estimation process;

[0012] Figure 4 is a diagram showing the details of a sound data acquisition process;

[0013] Figure 5 is a diagram showing the details of a process for determining whether an extraction process is required;

[0014] Figure 6 is a diagram showing the details of an analysis process;

[0015] Figure 7 is a diagram showing an example of analyzing sound data;

[0016] Figure 8 is a diagram showing an example of analyzing rotational speed data;

[0017] Figure 9 is a diagram showing an example of maximum sound frequency data;

[0018] Figure 10 is a diagram showing a set of maximum sound frequency data and rotational speed and their approximate straight line;

[0019] Figure 11 is a diagram showing the details of an extraction process;

[0020] Figure 12 is a diagram showing an example of frequency sound data including sounds other than noise;

[0021] Figure 13 is a diagram showing an example of extracted sound data for which an extraction range has been selected; and

[0022] Figure 14 is a diagram showing the configurations of a sound source estimation device and a sound source estimation server. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The same or corresponding elements in the drawings will be denoted by the same reference numerals, and their descriptions will not be repeated.

[0024] Figure 1 FIG. 1 is a diagram showing a sound source estimation device 100 including a sound source estimation system according to an embodiment of the present invention and a vehicle 200, which is an object for which the sound source estimation device 100 performs estimation. An engine 210 and a plurality of components are installed in the vehicle 200. The engine 210 generates a rotational motion, and the plurality of components generate sounds or vibrations as the engine 210 rotates. The order of the sound generated by each component as the engine 210 rotates is determined using the specifications of the corresponding component and is an order unique to the component (hereinafter referred to as a component order).

[0025] The sound source estimation device 100 includes a microphone 10, which will be described later and can detect sounds near the sound source estimation device 100. The vehicle 200 has an engine 210 installed in the front compartment. When a user of the vehicle 200 feels noise from the vehicle 200, the user of the sound source estimation device 100 uses the sound source estimation device 100 to estimate the sound source of the noise.

[0026] When estimating the sound source of the noise, the user of the sound source estimation device 100 opens the engine hood of the vehicle 200 to expose the front compartment to the outside, as Figure 1 shown. The user can use the microphone 10 to detect sounds near the engine 210 by bringing the sound source estimation device 100 close to the front compartment and use the sound source estimation device 100 to estimate the sound source of the noise.

[0027] Figure 2 FIG. 2 is a diagram showing the configuration of a sound source estimation device 100 including a sound source estimation system according to an embodiment of the present invention. The sound source estimation device 100 includes a microphone 10, a timer 20, a rotational speed acquisition unit 30, a data recording unit 40, a reproduction unit 50, an input unit 60, a display unit 70, a component estimation unit 80, and a data editing unit 90.

[0028] The microphone 10 detects nearby sounds and generates sound data. The timer 20 measures the detection time, which is the period during which the microphone 10 performs sound detection. The rotational speed acquisition unit 30 acquires the rotational speed of the engine 210 and generates rotational speed data.

[0029] The data recording unit 40 is a recording medium such as a flash memory, which records sound data, detection time, rotational speed data, etc. The reproduction unit 50 is a device such as a speaker, which reproduces the sound data or the extracted sound data, which will be described later as sounds.

[0030] The input unit 60 is a device such as a switch, a touch panel, a keyboard, a mouse, or a voice input device, which receives a user operation associated with the control of the sound source estimation device 100. When an input operation is performed on the input unit 60, the sound source estimation device 100 performs control based on the input operation. The display unit 70 is a device such as a liquid crystal display panel, which displays information about the control of the sound source estimation device 100 or options for control to the user.

[0031] The component estimation unit 80 estimates candidate sound sources of noise based on the order calculated from the analyzed sound data and the analyzed rotational speed data (to be described later). The component estimation unit 80 includes an order calculation unit 81, a component order information acquisition unit 82, and an order comparison unit 83.

[0032] The order calculation unit 81 calculates the order of the sound estimated to be noise by performing a routine (to be described later) on the analyzed sound data and the analyzed rotational speed data.

[0033] The component order information acquisition unit 82 acquires the component order information of each of a plurality of components that emit sound as the engine 210 rotates. For example, when the component is a gear, the component order of each component is determined by the size of the gear. The component order information of the components is pre-stored in the data recording unit 40, and the component order information acquisition unit 82 acquires the component order information of the components from the data recording unit 40. The user of the vehicle 200 can pre-register the model of the vehicle 200, the type of the engine 210, etc. in the sound source estimation device 100, and the component order information acquisition unit 82 can acquire the component order information by communicating with an external server.

[0034] The order comparison unit 83 estimates candidates for the components that are the sound sources of the noise by comparing the order of the noise calculated by the order calculation unit 81 with the component order information of each component acquired by the component order information acquisition unit 82.

[0035] The data editing unit 90 edits the sound data and the rotational speed data recorded in the data recording unit 40, and generates analyzed sound data and analyzed rotational speed data. The data editing unit 90 includes a frequency analysis unit 91 and an extraction processing unit 92.

[0036] The frequency analysis unit 91 performs frequency analysis on the sound data. The sound data detected by the microphone 10 represents the change in sound pressure with respect to time. The frequency analysis unit 91 performs a fast Fourier transform (FFT) on the sound data, and generates frequency sound data representing the change in the frequency spectrum with respect to time.

[0037] The extraction processing unit 92 performs an extraction process of extracting arbitrary frequency sound data (e.g., frequency sound data in a specific time range or frequency sound data within a specific frequency band) from the frequency sound data generated by the frequency analysis unit 91, and generates the extracted sound data.

[0038] In Figure 3 FIG. schematically shows a routine for estimating a sound source according to the present embodiment. S1 is a step of detecting noise and acquiring sound data. S2 is a step of acquiring rotation speed data corresponding to the acquired sound data. S3 is a step of performing frequency analysis on the sound data and generating frequency sound data. S4 is a step of determining whether an extraction process (to be described later) needs to be performed on the frequency sound data. S5 is a step of performing an extraction process on the frequency sound data or the rotation speed data. S6 is a step of estimating a candidate component of the sound source as the noise by analyzing based on the frequency sound data and the rotation speed data. S7 is a step of outputting information about the candidate component as the sound source.

[0039] Details of the step of acquiring sound data (S1) will be first described with reference to Figure 4 First, the sound source estimation device 100 waits for the user to input an operation associated with the detection of sound to the input unit 60 (S11).

[0040] The user brings the microphone 10 of the sound source estimation device 100 close to the operating engine 210 and performs an operation of starting to detect sound on the input unit 60 in this state (S12).

[0041] Accordingly, the sound source estimation device 100 starts to detect sound using the microphone 10 and detects the sound near the operating engine 210 (S13). The sound detection using the microphone 10 can be performed for a preset time, or can be performed only when the user continues to perform an operation such as long-pressing the input unit 60. At this time, the timer 20 measures the detection time, which is the time period during which the sound detection using the microphone 10 is performed.

[0042] Then, the sound source estimation device 100 reproduces the detected sound through the reproduction unit 50 (S14). Thus, the sound source estimation device 100 can allow the user to confirm the detected sound.

[0043] Then, the sound source estimation device 100 displays options such as "including noise" and "not including noise" on the display unit 70 (S15).

[0044] The user determines whether the noise is included in the sound confirmed in S14 (S16), and selects an option using the input unit 60. When "noise included" is selected (S17), the sound source estimation device 100 records the detected sound as sound data in the data recording unit 40. The detection time measured by the timer 20 is recorded in the data recording unit 40 in association with the sound data (S19).

[0045] When "noise not included" is selected (S18), the sound source estimation device 100 returns to the state of waiting for an input of an operation related to sound detection from the user (S11).

[0046] In S15, in addition to these two options, the option "reproduce sound" can also be displayed on the display unit 70. When the user selects "reproduce sound" using the input unit 60, the detected sound is reproduced using the reproduction unit 50. Thus, the user can confirm the detected sound again.

[0047] Through these steps, the sound source estimation device 100 can generate sound data including the noise generated in the vehicle 200.

[0048] After the sound data has been recorded, the sound source estimation routine proceeds to Figure 3 step S2 in, and the sound source estimation device 100 obtains rotational speed data corresponding to the sound data.

[0049] In S2, the rotational speed acquisition unit 30 acquires the rotational speed of the engine 210. As a method for acquiring the rotational speed, a method of acquiring control information from the ECU that controls the engine 210 can be considered. The sound source estimation device 100 acquires the control information of the ECU of the vehicle 200 by communicating with the vehicle 200. The rotational speed acquisition unit 30 acquires the rotational speed of the engine 210 during the time period corresponding to the detection time recorded in the data recording unit 40, and generates rotational speed data. The generated rotational speed data is recorded in the data recording unit 40 in association with the sound data.

[0050] Then, the sound source estimation routine proceeds to Figure 3 step S3 in, and the sound source estimation device 100 generates frequency sound data. In S3, the sound data is input to the data editing unit 90. The frequency analysis unit 91 performs FFT on the sound data input to the data editing unit 90, and generates frequency sound data.

[0051] Then, the sound source estimation routine proceeds to Figure 3 step S4 in and determines whether extraction processing needs to be performed on the frequency sound data. The details of step S4 will be described below with reference to Figure 5 description.

[0052] The sound source estimation device 100 displays options such as "including sounds other than noise" and "not including sounds other than noise" on the display unit 70 (S41).

[0053] The user determines whether the sound confirmed in S14 includes sounds other than noise (S42), and selects an option using the input unit 60. When "including sounds other than noise" is selected (S43), it is determined that the process of extracting frequency sound data in a specific frequency band or a specific time range needs to be performed, and in S5, the extraction processing unit 92 performs the process of extracting frequency sound data and rotational speed data. Thus, the analyzed sound data and the analyzed rotational speed data that have been extracted to exclude sounds other than noise are generated. The details of the extraction process performed in S5 will be described later.

[0054] When "not including sounds other than noise" is selected (S44), it is determined that the extraction process does not need to be performed, the frequency sound data and the rotational speed data are set as the analyzed sound data and the analyzed rotational speed data, and the routine proceeds to S6.

[0055] In S41, in addition to these two options, the option "reproduce sound" can also be displayed on the display unit 70. When the user selects "reproduce sound" using the input unit 60, the detected sound is reproduced using the reproduction unit 50. Thus, the user can confirm the detected sound again.

[0056] The analysis steps performed in S6 will be described below with reference to Figure 6 First, the analyzed sound data and the analyzed rotational speed data are input to the component estimation unit 80 (S61).

[0057] In Figure 7 an example of the analyzed sound data input to the component estimation unit 80 is shown. In Figure 7 the horizontal axis represents time, the vertical axis represents frequency, and the shade of the color represents the magnitude of the sound pressure. The darker the color, the higher the sound pressure. The area A including data with a relatively high sound pressure is surrounded by a dotted line.

[0058] In Figure 8 an example of the analyzed rotational speed data input to the component estimation unit 80 is shown. In Figure 8 the rotational speed is represented by the solid line 800.

[0059] The order calculation unit 81 calculates the order of the sound estimated to be noise based on the analyzed sound data and the analyzed rotational speed data input to the component estimation unit 80. The order calculation unit 81 first calculates the maximum sound frequency at a predetermined time interval, which is the frequency representing the maximum sound pressure, and generates the maximum sound frequency data (S62). Here, the frequencies in the extraction area A are considered.

[0060] Regarding the analysis of sound data, in Figure 5 in S43 in Figure 5 , "sounds other than noise" is selected, or extraction processing is performed on it, so that in Figure 3 in S5 in Figure 3 , sounds other than noise are excluded. Therefore, the maximum sound frequency will most likely be the frequency of the noise felt by the user. Figure 9 An example of the extracted maximum sound frequency data is shown in Figure 9 . In Figure 9 in Figure 9 , the extracted maximum sound frequency is represented by the solid line 900.

[0061] The order calculation unit 81 calculates the order (S63) of the maximum sound frequency data extracted in S62 using the maximum sound frequency data and the analysis rotation speed data.

[0062] In S63, using the least squares method or the like, linear approximation is performed on multiple sets of values of the maximum sound frequency data and the analysis rotation speed data at a predetermined time interval. Here, linear approximation is performed so that the intercept is 0. In Figure 10 in Figure 10 , the horizontal axis represents frequency, the vertical axis represents rotation speed, and an example of the points 1010 representing each set of values of the maximum sound frequency data and the analysis rotation speed data and the straight line 1020 representing the result of linear approximation of these values is shown. Only one of the points representing each set of values is numbered, and the others are not shown. The order calculation unit 81 calculates the slope of the straight line as the order.

[0063] When the order is calculated by the order calculation unit 81, the order comparison unit 83 estimates the component (S64) that is a candidate for the noise source based on the calculated order. Generally, this order can be calculated as the value obtained by dividing the frequency at a certain time by the rotation speed at that time, but the calculated order may not match the component order of the component that is the noise source. This is because there are slight differences between the component order determined by the specifications of each component and the order of the sound actually generated by that component due to manufacturing errors and the like.

[0064] Therefore, the order comparison unit 83 compares the order calculated by the order calculation unit 81 with the component orders of the multiple components installed in the vehicle 200 obtained by the component order information acquisition unit 82, and estimates the component with the component order closest to the calculated order as a candidate for the noise source. Therefore, even when there is a difference between the calculated order and the component order of the component that is the noise source, a candidate for the noise source can be estimated.

[0065] Due to the influence of the environment in which the sound is detected, sounds other than noise, etc., even if the same component is used as a sound source, the order calculated based on the maximum sound frequency and rotational speed at a certain time may be different from the component order of the sound source. In this embodiment, the order is calculated based on the values of multiple sets of maximum sound frequency data and analysis rotational speed data at a predetermined time interval. Therefore, the influence of sounds other than the environment or noise can be reduced.

[0066] In addition to the component having the component order closest to the calculated order among the multiple components installed in the vehicle 200, the order comparison unit 83 can also estimate multiple components having component orders within a predetermined range starting from the calculated order as candidates for the noise sound source.

[0067] When the sound source of the noise has been estimated, this routine proceeds to Figure 3 S7 in, and the sound source estimation device 100 displays information about the components estimated as candidates for the noise sound source on the display unit 70. Examples of the information displayed on the display unit 70 include the name, shape, installation position, inspection method, repair method, and replacement method of the components.

[0068] The user can perform inspections, repairs, replacements, etc. on the components estimated as candidates for the noise sound source as needed.

[0069] The extraction process executed in S5 in Figure 3 will be described below. Figure 11 A routine of the data extraction process is shown. The extraction processing unit 92 displays the frequency sound data (S51) on the display unit 70 and waits for the input of an operation from the user.

[0070] In Figure 12 an example of the displayed frequency sound data is shown. In Figure 12 , it is assumed that the noise data felt by the user of the vehicle 200 is included in the area A surrounded by the dotted line. Here, the sound pressure higher than the sound pressure in the area A is included in the area B surrounded by the dashed line. Therefore, when the order calculation unit 81 performs the processing in this way, it is possible that the frequency of the noise will not be extracted as the maximum sound frequency in Figure 6 S62.

[0071] The user selects a desired frequency band or a desired time range from the frequency sound data (S52). Specifically, the user uses the input unit 60 to select the desired frequency band or the desired time range to be extracted, or both, from the same image displayed on the display unit 70 as Figure 12 shown.

[0072] Figure 13 The frequency sound data is shown when the user selects both an arbitrary frequency band and an arbitrary time range. InFigure 13 The hatched portion in [it] indicates the area not selected by the user. The extraction processing unit 92 extracts arbitrary frequency sound data selected by the user from the sound data and generates the extracted sound data. The extraction processing unit 92 also generates the rotational speed data extracted from the rotational speed data within the time range selected by the user (S53). Therefore, areas including higher sound pressure outside area A can be excluded, and area A includes the noise perceived by the user.

[0073] Then, the sound source estimation device 100 uses the reproduction unit 50 to reproduce the extracted sound data (S54). Therefore, the user can confirm the extracted sound.

[0074] Then, the sound source estimation device 100 displays options such as "including sounds other than noise" and "not including sounds other than noise" on the display unit 70 (S55).

[0075] The user determines whether the sound confirmed in S54 includes sounds other than noise (S56) and selects an option using the input unit 60. When "not including sounds other than noise" is selected (S58), the sound source estimation device 100 determines the extracted sound data and the extracted rotational speed data as the analysis sound data and the analysis rotational speed data (S59), and then this routine proceeds to S6.

[0076] When "including sounds other than noise" is selected (S57), the sound source estimation device 100 displays the frequency sound data again (S51) and returns to the state waiting for an operation input from the user.

[0077] In S55, in addition to these two options, an option "reproduce sound" can also be displayed on the display unit 70. When the user selects "reproduce sound" using the input unit 60, the detected sound is reproduced by the reproduction unit 50. Therefore, the user can confirm the detected sound again.

[0078] Through this extraction processing, sounds outside the range selected by the user can be excluded, and in Figure 6 S62, the possibility that the frequency at which the noise is increased is extracted as the maximum sound frequency can be increased.

[0079] With the sound source estimation system of the above-mentioned sound source estimation device 100, even when there is a difference between the order of the maximum sound pressure and the order of the component serving as the sound source of the noise, candidates for the sound source can be estimated.

[0080] The sound source estimation system according to the present invention can be a system provided in a smart phone. In this case, the microphone for voice communication is used as the microphone 10, and the speaker for notifying incoming calls and the like is used as the reproduction unit 50. The touch panel is used as the input unit 60 and the display unit 70. The communication device for communicating with the outside is used as the rotation speed acquisition unit 30, and the rotation speed can be acquired through communication with the vehicle 200. Generally, a recording medium such as a flash memory is provided in the smart phone for recording data, and this recording medium can be used as the data recording unit 40. Programs for executing the processing of the timer 20, the component estimation unit 80, and the data editing unit 90 can be stored in the recording medium, and the sound source can be estimated by causing the central processing unit to execute this program.

[0081] The sound source estimation device 100 can be a device installed in the vehicle 200, rather than a mobile terminal independent of the vehicle 200.

[0082] The user of the sound source estimation system according to the present invention can be the user of the vehicle 200, or can be a staff member of a repair factory where the vehicle 200 enters, etc. When the staff member uses the sound source estimation device 100, the staff member can perform the operation associated with the detection of sound in S12 or the operation associated with the extraction of sound in S52, and the user of the vehicle 200 can perform the confirmation of noise in S16, S42, and S56. These operations can be performed by the staff member and the user of the vehicle 200 together.

[0083] In the above embodiment, the sound source estimation device 100 includes all the elements of the sound source estimation system according to the present invention. However, these elements can be distributed and provided in multiple devices. For example, as Figure 14 shown, the microphone 10, the rotation speed acquisition unit 30, the timer 20, the display unit 70, the input unit 60, and the reproduction unit 50 can be provided in the sound source estimation device 100, and the data recording unit 40, the component estimation unit 80, and the data editing unit 90 can be provided in an external sound source estimation server 300. In this case, by causing the sound source estimation device 100 to execute Figure 3 the processing of S1 to S5, the analysis sound data and the analysis rotation speed data are generated. Thereafter, the analysis sound data and the analysis rotation speed data are sent to the sound source estimation server 300 through communication means and the like, and the analysis of S6 is performed by the sound source estimation server 300. Information about the components estimated as candidates for the sound source of the noise is sent from the sound source estimation server 300 to the sound source estimation device 100 and output by the sound source estimation device 100.

[0084] In the above embodiment, the microphone 10 is used as a sound and vibration acquisition unit. The sound and vibration acquisition unit may be a vibration pickup that detects vibration. In this case, the noise is abnormal vibration generated in the vehicle 200, and the sound source estimation system estimates candidates for the vibration source of the abnormal vibration.

[0085] In the above embodiment, the engine 210 is used as a rotating device. However, the rotating device is not particularly limited as long as it generates a rotational motion and a plurality of components move by the rotational motion, and for example, it may be an electric motor.

[0086] In the above embodiment, the vehicle 200 is used as an object in which the sound source is estimated. However, the object is not limited to a vehicle and may be any device as long as it includes a rotating device (such as an engine or an electric motor) and a plurality of components that move with the rotational motion generated by the rotating device. For example, an airplane in which a propeller is rotated by a rotating device or a ship in which a screw is rotated by a rotating device can be used as the object.

[0087] In the above embodiment, the display unit 70 is used as an output unit. However, the output unit is not limited to a configuration for displaying information. For example, the output unit may be a device that outputs information as a printed matter or a device that outputs information by voice.

[0088] Information about the sound source candidates is not output to the user, but may be output to another device. In this case, the output unit may be a communication unit that outputs a signal from the sound source estimation device 100 to another device. Another device that obtains information about the sound source candidates from the sound source estimation device 100 may estimate the component as the sound source candidate with higher accuracy by additionally performing an analysis while considering information other than the information obtained from the sound source estimation device 100.

[0089] In the above embodiment, the magnitude of the sound (loudness) is described as the magnitude of the sound pressure. However, the index of the sound magnitude (loudness) is not limited to the sound pressure and may be, for example, the magnitude of the sound pressure level or the magnitude of the perceived intensity expressed in phons or sones.

[0090] The above embodiments may be combined as appropriate. It should be understood that the above embodiments are exemplary in all aspects and not restrictive. The scope of the present disclosure is defined by the appended claims rather than by the description of the above embodiments, and is intended to include all modifications without departing from the meaning and scope equivalent to the claims.

Claims

1. A sound source estimation system, comprising: A sound and vibration acquisition unit configured to acquire sound generated from an object; A rotational speed acquisition unit configured to acquire the rotational speed of a rotating device installed in the object and generating a rotational motion; A frequency analysis unit configured to generate frequency sound data representing changes in the sound spectrum of the sound detected by the sound and vibration acquisition unit; An input unit configured to receive a user operation; A display unit configured to display an option indicating whether the sound acquired by the sound and vibration acquisition unit includes a sound other than noise; An extraction processing unit configured to, when an option indicating a sound other than noise is selected, extract frequency sound data within a specific frequency band or a specific time range selected by the user from the frequency sound data generated by the frequency analysis unit based on the user operation received by the input unit; An order calculation unit configured to calculate the order of the maximum sound frequency based on the maximum sound frequency and the rotational speed acquired by the rotational speed acquisition unit, the maximum sound frequency being the frequency of the maximum sound in the frequency sound data extracted by the extraction processing unit; A component order information acquisition unit configured to acquire order information of a plurality of components associated with the sound generated by the plurality of components installed in the object as the rotational motion occurs; An order comparison unit configured to, based on the order information acquired by the component order information acquisition unit, determine as a noise sound source candidate the component having an order closest to the order calculated by the order calculation unit; And An output unit configured to output information about the noise sound source candidate.

2. The sound source estimation system according to claim 1, wherein, The order calculation unit calculates the order based on the maximum sound frequency at each predetermined time and the rotational speed at each predetermined time.

3. The sound source estimation system according to claim 2, wherein, The order calculation unit calculates an approximate straight line with an intercept of 0 for the maximum sound frequency at each predetermined time and the rotational speed at each predetermined time for multiple sets, and calculates the slope of the approximate straight line as the order.

4. A sound source estimation method, comprising: A sound and vibration acquisition step for acquiring sound generated from an object; A rotational speed acquisition step for acquiring the rotational speed of a rotating device installed in the object and generating a rotational motion; A frequency analysis step for generating frequency sound data representing changes in the sound spectrum of the sound detected in the sound and vibration acquisition step; An input step for receiving a user operation; A display step for displaying an option indicating whether the sound acquired in the sound and vibration acquisition step includes a sound other than noise; An extraction processing step for, when an option indicating a sound other than noise is selected, extracting frequency sound data within a specific frequency band or a specific time range selected by the user from the frequency sound data generated in the frequency analysis step based on the user operation received in the input step; Order calculation step, for calculating the order of the maximum sound frequency based on the maximum sound frequency and the rotational speed of the rotating device obtained in the rotational speed acquisition step, the maximum sound frequency being the frequency representing the maximum sound in the frequency sound data extracted in the extraction processing step; Component order information acquisition step, for acquiring the order information of the plurality of components associated with the sounds generated by the plurality of components installed in the object during the rotational movement; Order comparison step, for determining, based on the order information acquired in the component order information acquisition step, the component having the order closest to the order calculated in the order calculation step as a candidate for the noise sound source; And Output step, for outputting information about the candidate for the noise sound source.

Images