Inspected sound determination method, inspected sound determination device, and inspected sound determination program

Abstract

This inspected sound determination device comprises: a sound collection unit (3) that acquires sound including inspected sound produced from a vehicle (1); a microphone position acquisition unit (4) that acquires the position of the sound collection unit (3); a sound correction unit (6) that corrects the sound including the inspected sound collected by the sound collection unit (3) on the basis of the position of the sound collection unit (3) acquired by the microphone position acquisition unit (4); an inspected sound extraction unit (7) that extracts the inspected sound from consecutive sound data corrected by the sound correction unit (6); and a sound evaluation determination unit (8) that determines whether or not the inspected sound is normal by comparing the extracted inspected sound with predetermined inspection reference sound.

Description

Test target sound determination method, test target sound determination device, and test target sound determination program

[0001] The present invention relates to an inspection target sound determination method, an inspection target sound determination device, and an inspection target sound determination program for inspecting an inspection target sound generated from an inspection target in, for example, an automobile inspection process.

[0002] The sound information recording device described in Patent Document 1 includes a sound collection device attached to an object, a recording device that records the sound collected by the sound collection device, an imaging device that captures an image of the space in which the object is located, a position identification unit that identifies the position of the object that is the sound source, and a spatial sound information generation unit that associates the recorded sound with the position and the image to generate spatial sound information. Furthermore, this spatial sound information is adjusted according to a preset sound field.

[0003] Although the sound information recording device of Patent Document 1 discloses processing sound collected by a sound collection device attached to an object, no consideration is given to processing sound from a sound source located at a distance from the sound collection device.

[0004] The present invention was devised in view of the current situation, and one of its objects is to provide a test target sound determination method, a test target sound determination device, and a test target sound determination program that can improve the accuracy of testing test target sounds related to test objects located at a distance from a sound collection device.

[0005] JP 2023-78689 A

[0006] The present invention relates to a method for determining a test target sound, in which a test target sound generated from a test object is collected by a sound collection device worn by a user, the position of the sound collection device relative to the test object is obtained, the test target sound is corrected based on this position, and the corrected test target sound is compared with a predetermined test reference sound to determine whether the corrected test target sound is normal.

[0007] Therefore, even if the position of the sound collection device relative to the test object changes due to the user's physique or posture, the test object sound is corrected based on the position of the sound collection device relative to the test object, and the test object sound can be obtained with high accuracy.

[0008] Therefore, according to the present invention, it is possible to improve the accuracy of inspection of the test target sound relating to the test target located at a position distant from the sound collection device.

[0009] FIG. 1 is an explanatory diagram showing an overview of a finished vehicle inspection process in a first embodiment. FIG. 2 is a functional block diagram of an inspection target sound determination device in a first embodiment. FIG. 3 is an explanatory diagram showing inspection results of an inspection target sound displayed on a display unit in the first embodiment. FIG. 4 is a flowchart showing the control flow in the first embodiment. FIG. 5 is a functional block diagram of an inspection target sound determination device in a second embodiment. FIG. 6 is an explanatory diagram showing inspection results of an inspection target sound displayed on a display unit in the second embodiment. FIG. 7 is a flowchart showing the control flow in the second embodiment. FIG. 8 is a functional block diagram of an inspection target sound determination device in a third embodiment. FIG. 9 is an explanatory diagram showing inspection results of an inspection target sound displayed on a display unit in the third embodiment. FIG. 10 is a flowchart showing the control flow in the third embodiment.

[0010] An embodiment of the inspection target sound determination device of the present invention will be described below with reference to the drawings. In the following embodiment, the present invention is applied to the finished vehicle inspection process, which is the final stage of an automobile production line, as an example. In this finished vehicle inspection process, a user (inspector) test drives the finished vehicle on free rollers, and inspects the inspection target sounds, such as notification sounds and alarms, generated from the inspection target speakers installed in the finished vehicle according to a predetermined inspection sequence.

[0011] As shown in FIG. 1 , in this completed vehicle inspection process, a user P is seated in a driver's seat (not shown) of a completed vehicle (hereinafter referred to as "vehicle 1"), and a so-called sensory evaluation based on the user P's senses is performed to determine whether the test sound generated from a meter speaker 2 provided in the vehicle 1 can be properly heard. This sensory evaluation is performed by rotating multiple users in the completed vehicle inspection process. For example, when a user Q (shown by a dashed line in FIG. 1 ) who is smaller than user P is seated in the driver's seat (not shown) of the vehicle 1, user Q, particularly the upper body Qa and head Qb of user Q, are positioned closer to the meter speaker 2 than the upper body Pa and head Pb of user P. Therefore, the test sound generated from the meter speaker 2 is heard differently between user P and user Q due to the difference in their physiques. Furthermore, for a single user P, the distance from the meter speaker 2 to the head Pb including the ears of the user P changes depending on the posture of the user P during the test, and therefore the test target sound is heard differently from the meter speaker 2. One of the purposes of the test target sound determination device of this embodiment is to suppress differences in sensory evaluation due to differences in physique between multiple users P, Q and differences in the posture of each of the users P and Q.

[0012] Furthermore, the speaker to be inspected is not limited to the meter speaker 2, but may be another speaker, such as a door speaker or pillar speaker.

[0013] In addition, for the sake of simplicity, the following description will mainly focus on an example in which user P performs the inspection as a representative of the users who perform the inspection inside vehicle 1 during the completed vehicle inspection process.

[0014] 2 shows a functional block diagram of the test target sound determination device of Example 1. The test target sound determination device is configured with a sound collection unit (sound collection device) 3, a microphone position acquisition unit 4, a vehicle signal acquisition unit 5, a sound correction unit 6, a test target sound extraction unit 7, a sound evaluation and determination unit 8, a retest instruction unit 9, a memory unit 10, and a display unit 11.

[0015] The sound collection unit 3 is a wireless microphone that acquires sounds, including inspection target sounds, generated from the vehicle 1 during the finished vehicle inspection process and converts them into electrical signals, i.e., sound data. This microphone has a built-in recording unit that temporarily stores the sound data. The microphone's directivity, sampling frequency, frequency band, sensitivity characteristics, etc. are selected according to the inspection target and the sound field environment, etc. The sounds collected by the sound collection unit 3 are mainly inspection target sounds generated from the meter speaker 2, which is the inspection target, but also include running sounds generated when the finished vehicle 1 is test run on a free roller and sounds generated around the vehicle 1 at the finished vehicle inspection site. The sound collection unit 3 is worn at any position on the upper body Pa or head Pb of the user P that is relatively close to the ear, for example, on the left shoulder.

[0016] The microphone position acquisition unit 4 is configured as a BLE beacon, and acquires the microphone position, which is the position of the sound collection unit 3, by receiving BLE radio waves emitted by the BLE beacon with the sound collection unit 3, which is a microphone. In addition, since the position of the vehicle 1 placed on the free rollers at the finished vehicle inspection site is determined in advance, the position of the meter speaker 2 provided on the vehicle 1 is known. Therefore, by acquiring the microphone position, the microphone position relative to the meter speaker 2 can be identified.

[0017] Furthermore, a reference position of the sound collection unit 3 relative to the meter speaker 2 is stored in a storage unit (not shown) of the test target sound determination device as the microphone position at which user P can most appropriately capture the test target sound generated from the meter speaker 2 inside the vehicle 1. Note that for user Q, who has a different physique from user P, a reference position specific to this user Q is also stored in the storage unit.

[0018] The vehicle signal acquisition unit 5 constantly acquires vehicle signals as CAN signals during test runs of the vehicle 1 in the completed vehicle inspection process. For example, if the vehicle signal is a signal indicating that the shift lever is in the "R" position, a vehicle back-up alarm is sounded from the meter speaker 2 as the test sound. Note that if the vehicle signal includes a signal indicating that the shift lever is in the "R" position and also a signal indicating that the vehicle speed is zero, the vehicle back-up alarm may also be sounded from the meter speaker 2. For example, if the vehicle signal includes a signal indicating that the vehicle speed is a predetermined speed, e.g., 15 km / h, and a signal indicating that the seat belt signal is off, a seat belt alarm is sounded from the meter speaker 2 as the test sound. In this manner, the type of test sound to be sounded from the meter speaker 2 is determined based on the acquired vehicle signal. Note that, for convenience of explanation, this embodiment will describe an example in which a vehicle back-up alarm and a seat belt alarm are sounded from the meter speaker 2; however, in practice, the speakers to be used are preset depending on the type of test sound.

[0019] In addition, in the completed vehicle inspection process, if the user does not inspect the target sound while test-driving the completed vehicle on free rollers, but rather inspects the target sound of a completed vehicle that is not in a test run state, the specific target sound can be made to sound from the meter speaker 2 by sending an active signal or pseudo signal corresponding to the specific target sound from a PC (personal computer) to the vehicle 1.

[0020] The sound correction unit 6 corrects the sound including the test target sound collected by the sound collection unit 3, based on the microphone position acquired by the microphone position acquisition unit 4. More specifically, the sound correction unit 6 corrects the sound including the test target sound, based on a comparison between the acquired microphone position relative to the meter speaker 2 and the reference position of the sound collection unit 3 relative to the meter speaker 2 for the user P.

[0021] The test target sound extraction unit 7 extracts test target sounds, for example, vehicle backing up warnings, substantially in real time from the continuous sound data corrected by the sound correction unit 6. That is, the test target sound extraction unit 7 focuses on sounds in a predetermined frequency band as a frequency band characteristic of a vehicle backing up warning from the continuous sound data, and extracts the vehicle backing up warning based on the condition of whether or not the sound pressure (or sound pressure level, hereinafter referred to as sound pressure) is equal to or greater than a predetermined sound pressure. Then, sound data having a length of, for example, several seconds, including the vehicle backing up warning is generated.

[0022] The sound evaluation and determination unit 8 compares the test sound contained in the generated sound data, approximately several seconds long, with a predetermined test reference sound to determine whether the test sound is normal. Prior to this determination, the sound data is quantified using, for example, frequency analysis techniques such as FFT (Fast Fourier Transform) or wavelet transform / analysis. Alternatively, for example, the sound data may be converted into two-dimensional frequency characteristics (spectrum) with frequency on the horizontal axis and sound pressure or power on the vertical axis by frequency analysis, or all extracted data may be converted into frequency characteristics collectively, or data may be extracted over a predetermined data length (time window) and overlapped and slid over time to calculate frequency characteristics. Furthermore, the frequency characteristics may be multiplied by A-weighting or C-weighting, which are frequency characteristics of human hearing sensitivity, to obtain frequency characteristics tailored to hearing sensitivity. Alternatively, the sound data may be quantified using a three-dimensional spectrogram consisting of time, frequency, and sound pressure, or a Mel-Cepstrum method used in speech recognition. If the corrected test sound matches a predetermined test reference sound, the sound evaluation and determination unit 8 determines that the test sound is normal. For example, if the test sound is a vehicle backing up alarm, the sound evaluation and determination unit 8 determines that the vehicle backing up alarm is normal if the test sound matches a predetermined test reference sound related to the vehicle backing up alarm, i.e., the predetermined test reference sound as designed.

[0023] The storage unit 10 stores the judgment results made by the sound evaluation and judgment unit 8, i.e., whether the sound being inspected is normal or not. It also stores the sound data used for the evaluation as a sound file, in addition to the vehicle model and type being inspected, the inspection standards, conditions, inspector information, etc.

[0024] The display unit 11 is a display provided within the vehicle 1 and displays the test results of the test target sound in the form of text data. As shown in FIG. 3 , in this embodiment, the display unit 11 displays the test results of the test target sound related to a vehicle back-up warning. On the left side of the display unit 11, the test item names, such as feature A (maximum sound pressure level), feature B (peak frequency), feature C (sounding duration), and feature D (sounding stop duration), are displayed in the form of text data. Design values ​​for feature A to D are preset for a specific test target sound in a specific vehicle model. In this embodiment, because feature A to D are in line with the design values, all the results are "OK," as shown in FIG. 3 . Therefore, the test result for the vehicle back-up warning is "OK," meaning that the test target sound is normal and no retesting of the test target sound is necessary. Therefore, correction of the microphone position is not required. Also, on the right side of the display unit 11, there are displayed sound data 12a including the sound to be tested, with the horizontal axis representing time and the vertical axis representing sound pressure level (Sound Level), as data collected by the sound collection unit 3; a spectrogram 12b obtained by quantifying this sound data 12a using FFT and with the horizontal axis representing time and the vertical axis representing frequency (Frequency); and a spectrum 12c obtained by quantifying the sound data 12a using FFT and with the horizontal axis representing frequency and the vertical axis representing sound power (Sound Power), so that information about the sound can be visually confirmed.

[0025] The retest instruction unit 9 instructs the user P to perform a retest when the sound evaluation determination unit 8 determines that the test target sound is not normal. This retest instruction is notified to the user P in the form of text data displayed on the display unit 11, instructing the user P to collect the test target sound again using the sound collection unit 3. Furthermore, instead of notifying the user P of the instruction in the form of text data displayed, the retest instruction may be notified to the user P by voice.

[0026] Next, the control flow of the first embodiment will be described with reference to Fig. 4. This control is performed by causing a computer installed in the vehicle 1 to execute a test target sound determination program (not shown).

[0027] First, in step S1, the sound generated from the vehicle 1 is collected by the sound collection unit 3 provided on the user P. This sound includes the test sound from the meter speaker 2.

[0028] Next, in step S2, a vehicle signal is acquired as processing performed by the vehicle signal acquisition unit 5, and the type of sound to be inspected is identified based on this acquired vehicle signal. For example, a position signal of the shift lever in "R" is acquired as the vehicle signal, and from this position signal, it is identified that the sound to be inspected is a vehicle backing up warning.

[0029] After the sound to be inspected has been identified, in step S3, the position of the sound collection unit 3, i.e., the microphone position, is acquired as processing performed by the microphone position acquisition unit 4. As described above, since the position of the meter speaker 2 in the finished vehicle inspection site is known, the microphone position relative to the meter speaker 2 can be identified.

[0030] Next, in step S4, it is determined whether or not correction of the sound including the test target sound collected by the sound collection unit 3 is necessary. If it is determined that sound correction is necessary, the process proceeds to step S5, where the sound is corrected as processing performed by the sound correction unit 6.

[0031] If it is determined in step S4 that sound correction is not necessary, the process proceeds to step S6, where it is determined whether the test target sound acquired in step S1 or the test target sound corrected in step S5 matches a predetermined test reference sound. If it is determined that the test target sound matches the predetermined test reference sound, the process proceeds to step S7, where the test results for the test target sound are stored and displayed as processing performed in memory unit 10 and display unit 11.

[0032] If it is determined in step S6 that the sound does not match the predetermined test reference sound, the process proceeds to step S8, where the retest instruction unit 9 instructs the user P to take a retest.

[0033] Then, in step S9, the results including the retest are stored and displayed as processing performed by the storage unit 10 and display unit 11, and the process returns to step S1.

[0034] As described above, in the first embodiment, the test target sound determination device includes a sound collection unit 3 that acquires sound that includes the test target sound generated from the vehicle 1, and a microphone position acquisition unit 4 that acquires the microphone position. Furthermore, because the position of the meter speaker 2, which is the sound source, is known, the microphone position relative to the meter speaker 2 is identified. Furthermore, the sound correction unit 6 corrects the sound that includes the test target sound collected by the sound collection unit 3, based on the microphone position relative to the meter speaker 2. Therefore, even if the microphone position relative to the meter speaker 2 changes due to the physique or posture of the user P, the test target sound can be acquired with high accuracy by correcting the test target sound based on the microphone position relative to the meter speaker 2. This improves the accuracy of inspection of the test target sound by the user P during the finished vehicle inspection process.

[0035] Furthermore, in this embodiment, if the sound evaluation determination unit 8 determines that the test target sound is not normal, the retest instruction unit 9 notifies the user P of an instruction to collect the test target sound again using the sound collection unit 3. This notification enables the user P to quickly perform a retest in order to obtain an appropriate test target sound.

[0036] 5 shows a functional block diagram of a test target sound determination device according to Example 2. The test target sound determination device according to Example 2 is configured by adding a microphone orientation acquisition unit 13 to the test target sound determination device according to Example 1, and by replacing the retest instruction unit 9 of the test target sound determination device according to Example 1 with an orientation instruction unit 14.

[0037] The microphone attitude acquisition unit 13 is configured as an inclinometer (three-axis inclinometer) attached to the sound collection unit 3, and acquires the attitude of the sound collection unit 3, i.e., the microphone attitude. As described above, the position of the meter speaker 2 provided in the vehicle 1 is known, so if the microphone attitude is acquired, the microphone attitude relative to the meter speaker 2 can be specified. A reference attitude of the sound collection unit 3 relative to the meter speaker 2 is stored in a storage unit (not shown) in the test target sound determination device as the microphone attitude that allows user P to most appropriately capture the test target sound generated from the meter speaker 2 inside the vehicle 1. Note that for user Q, who has a different physique from user P, a reference attitude specific to this user Q is also stored in the storage unit.

[0038] The posture instruction unit 14 instructs the user P to change their posture when the sound evaluation determination unit 8 determines that the test target sound is abnormal. The posture instruction unit 14 is a well-known rangefinder (with an angle sensor) that can be carried in one hand, or an even smaller measuring device that is integrated with a microphone in a sound collection unit, and measures, for example, the position of the vehicle 1 in the fore-and-aft direction (X direction in FIG. 6 ), the vehicle width direction (Y direction in FIG. 6 ), and the up-and-down direction (Z direction in FIG. 6 ), the tilt of the vehicle 1 in the vehicle width direction with respect to the fore-and-aft direction (θh in FIG. 6 ), and the tilt of the vehicle 1 in the up-and-down direction with respect to the fore-and-aft direction (θv in FIG. 6 ), and instructs the user P to change their posture. Furthermore, the posture instruction unit 14 may be an on-board camera for monitoring work, etc., instead of a well-known rangefinder (with an angle sensor). In this case, the vehicle-mounted camera constantly captures each point of the user P's upper body Pa, head Pb, arms Pc, and Pc, and calculates the amount of movement and angle required to change the user P's posture by comprehensively judging the amount of deviation of each point.

[0039] As shown in FIG. 6 , in this embodiment, the display unit 11 displays the inspection results for the test sound related to the seat belt warning. In this embodiment, because feature quantities B to D are as designed, the result is "OK" as shown in FIG. 6 . However, because feature quantity A is not as designed (within the acceptable range), the result is "NG." Therefore, the result of the vehicle back-up warning inspection is "NG," meaning that the test sound is determined to be abnormal. The fact that the test sound is abnormal indicates that the microphone position and orientation are deviated from the reference position and orientation of the sound collection unit 3, meaning that the microphone position and orientation are "NG." The display unit 11 instructs the user P to change their position using the orientation change instruction display 15 shown on the right side of FIG. 6 to correct the microphone position and orientation to the reference position and orientation of the sound collection unit 3. 6, instructions to correct the microphone position to the reference position of the sound collection unit 3 include a movement of +35 mm in the X direction, which is the longitudinal direction of the vehicle 1, a movement of +35 mm in the Y direction, which is the width direction of the vehicle 1, and a movement of +35 mm in the Z direction, which is the vertical direction of the vehicle 1. In addition, instructions to correct the microphone attitude to the reference attitude of the sound collection unit 3 include a change in the angle of inclination θh in the width direction of the vehicle 1 with respect to the longitudinal direction of the vehicle 1 and the angle of inclination θv in the vertical direction with respect to the longitudinal direction of the vehicle 1.

[0040] Next, the control flow of the second embodiment will be described with reference to Fig. 7. In Fig. 7, steps that are the same as those in the first embodiment shown in Fig. 4 are numbered the same.

[0041] First, in step S1, sounds including the test sound generated from the vehicle 1 are collected by the sound collection unit 3, then in step S2 the type of test sound is identified based on the vehicle signal, and in step S3 the position of the sound collection unit 3, i.e. the microphone position, is acquired. In step S2, the test sound is identified as a seat belt warning, for example, based on a signal indicating that the vehicle speed is a predetermined vehicle speed and a signal indicating that the seat belt signal is off.

[0042] Next, in step S10, the microphone attitude acquisition unit 13 acquires the attitude of the sound collection unit 3, that is, the microphone attitude.

[0043] Then, in step S4, it is determined whether or not correction of the sound collected by the sound collection unit 3 is necessary, and if it is determined that correction of the sound is necessary, the process proceeds to step S5, where the sound is corrected.

[0044] Furthermore, if it is determined in step S4 that sound correction is not necessary, the process proceeds to step S6, where it is determined whether the test target sound acquired in step S1 or the test target sound corrected in step S5 matches a predetermined test reference sound, and if it is determined that the test target sound matches the predetermined test reference sound, the test results for the test target sound are stored and displayed in step S7.

[0045] If it is determined in step S6 that the sound does not match the predetermined test reference sound, the process proceeds to step S11, where the posture instruction unit 14 instructs the user P to change his / her posture.

[0046] Then, in step S12, the results including the change in posture are stored and displayed, and the process returns to step S1.

[0047] As described above, in the second embodiment, the test target sound determination device further includes a microphone attitude acquisition unit 13 that acquires the microphone attitude. Furthermore, the sound correction unit 6 corrects the sound, including the test target sound, collected by the sound collection unit 3, based on the microphone attitude relative to the meter speaker 2 that is the test target, in addition to the microphone position relative to the meter speaker 2 that is the test target. Therefore, even if the microphone attitude relative to the meter speaker 2 changes depending on the posture of the user P, the test target sound can be acquired with high accuracy by correcting the sound including the test target sound based on this microphone attitude. This improves the accuracy of the test target sound inspection by the user P in the finished vehicle inspection process.

[0048] Furthermore, in this embodiment, if the sound evaluation determination unit 8 determines that the test target sound is not normal, the posture instruction unit 14 notifies the user P of an instruction to correct the posture of the user P. As a result, the user P tests the test target sound again using the sound collection unit 3 in an appropriate test posture, and the test target sound can be acquired with high accuracy.

[0049] 8 shows a functional block diagram of a test target sound determination device according to Example 3. The test target sound determination device according to Example 3 is configured by adding a spatial characteristics acquisition unit 16 to the test target sound determination device according to Example 2, and by replacing the attitude instruction unit 14 of the test target sound determination device according to Example 2 with a retest / attitude instruction unit 17.

[0050] The spatial characteristic acquisition unit 16 acquires acoustic spatial characteristic information between the sound collection unit 3, which is worn on the left shoulder of the user P, for example, and each speaker, the meter speaker 2 in this embodiment. More specifically, the spatial characteristic acquisition unit 16 is, for example, an in-vehicle camera, and acquires information on whether an obstacle 18 is located between the meter speaker 2 and the sound collection unit 3. The obstacle 18 is, for example, a test form on which the user P writes the test results of the test target sound when testing the test target sound. The obstacle 18 may not be a test form, but may be, for example, a tablet on which the test results can be input using a touch panel. Furthermore, the inspector's arm or the like may be between the microphone and the speaker.

[0051] The reexamination and attitude instruction unit 17 has the function of the reexamination instruction unit 9 in the first embodiment and the function of the attitude instruction unit 14 in the second embodiment.

[0052] 9, in the third embodiment, the display unit 11 displays the inspection result of the test target sound when the spatial characteristic acquisition unit 16 detects an obstacle 18 between the sound collection unit 3 and the meter speaker 2. As shown on the left side of Fig. 9, the display unit 11 displays, in the form of text data, information such as "An obstacle has been detected" and information such as "Please remove the obstacle and perform the inspection again." The obstacle detection display 19 in Fig. 9 also shows, as a schematic illustration, that an obstacle 17 is present between the sound collection unit 3 and the meter speaker 2.

[0053] The control flow of the third embodiment will be described below with reference to Fig. 10. In Fig. 10, steps that are the same as those in the first embodiment shown in Fig. 4 are numbered the same.

[0054] First, in step S1, the sound collection unit 3 collects sounds including the sound to be inspected generated from the vehicle 1, in step S2 the type of sound to be inspected is identified based on the vehicle signal, in step S3 the position of the sound collection unit 3, i.e. the microphone position, is acquired, and in step S10 the attitude of the sound collection unit 3, i.e. the microphone attitude, is acquired.

[0055] Next, in step S13, the spatial characteristic acquisition unit 16 acquires acoustic spatial characteristic information between the sound collection unit 3 and the meter speaker 2. That is, information on whether or not an obstacle 18 is present between the sound collection unit 3 and the meter speaker 2 is acquired.

[0056] Then, in step S4, it is determined whether or not correction of the sound collected by the sound collection unit 3 is necessary. If the acoustic space characteristic information indicates that no obstacle 18 is located between the sound collection unit 3 and the meter speaker 2 and it is determined that sound correction is necessary, the process proceeds to step S5, where the sound is corrected.

[0057] Furthermore, if it is determined in step S4 that sound correction is not necessary, the process proceeds to step S6, where it is determined whether the test target sound acquired in step S1 or the test target sound corrected in step S5 matches a predetermined test reference sound, and if it is determined that the test target sound matches the predetermined test reference sound, the test results for the test target sound are stored and displayed in step S7.

[0058] Furthermore, if it is determined in step S6 that the sound does not match the predetermined test standard sound, it is assumed that the obstacle 18 is located between the sound collection unit 3 and the meter speaker 2, and the process proceeds to step S14, where the display unit 11 displays an instruction to the user P to remove the obstacle 18.

[0059] After the obstacle 18 is removed, in step S15, the reexamination / posture instruction unit 17 instructs the user P to perform a reexamination and change his / her posture.

[0060] Then, in step S16, the results including re-examination etc. are stored and displayed.

[0061] As described above, in the third embodiment, the test target sound determination device further includes a space characteristic acquisition unit 16 that acquires acoustic space characteristic information between the sound collection unit 3 and the meter speaker 2. Furthermore, when the acoustic space characteristic information indicates that there is no obstacle 18 between the sound collection unit 3 and the meter speaker 2, the sound correction unit 6 corrects the sound collected by the sound collection unit 3 based on the microphone position relative to the meter speaker 2 that is the test target. Therefore, in a stable test environment where the sound from the meter speaker 2 to the sound collection unit 3 is not obstructed, the sound collected by the sound collection unit 3 can be efficiently corrected based on the microphone position relative to the meter speaker 2.

[0062] Furthermore, in this embodiment, when the acoustic space characteristic information indicates that an obstacle 18 is located between the sound collection unit 3 and the meter speaker 2, the user P is notified of an instruction to again collect sounds including the test target sound using the sound collection unit 3. By referring to this notification, the user can remove the obstacle 18 and then collect sounds again, thereby making it possible to acquire highly accurate sounds that are not blocked by the obstacle 18.

[0063] In the above embodiments, examples have been disclosed in which the sound to be inspected is inspected while users P and Q are seated in the driver's seat of vehicle 1, but the present invention may also be applied to examples in which the sound to be inspected is inspected from outside vehicle 1.

Claims

1. A method for determining a test target sound, comprising: collecting test target sound generated from a test target using a sound collection device worn by a user; obtaining the position of the sound collection device relative to the test target; correcting the test target sound based on this position; and comparing the corrected test target sound with a predetermined test reference sound to determine whether the corrected test target sound is normal.

2. The test target sound determination method according to claim 1, further comprising: acquiring the attitude of the sound collection device relative to the test target; and correcting the test target sound based on the position and attitude.

3. The test target sound determination method according to claim 1, further comprising: acquiring acoustic space characteristic information between the sound collection device and the test target; and correcting the test target sound based on the position and the acoustic space characteristic information.

4. A test target sound determination method as described in claim 3, wherein when the acoustic space characteristic information indicates that an obstacle is located between the sound collection device and the test target, the user is notified of an instruction to collect the test target sound again using the sound collection device.

5. The test target sound determination method according to claim 2, further comprising the step of: notifying the user of an instruction to correct the user's posture if the corrected test target sound is determined to be abnormal.

6. The test target sound determination method according to claim 3, wherein if the corrected test target sound is determined to be abnormal, the user is notified of an instruction to collect the test target sound again using the sound collection device.

7. The inspection target sound determination method according to claim 1, wherein the inspection target sound is collected during the finished vehicle inspection process.

8. A test target sound determination device comprising: a sound collection unit that is worn by a user and collects test target sound generated from a test target; a position acquisition unit that acquires the position of the sound collection unit relative to the test target; a correction unit that corrects the test target sound based on this position; and a determination unit that determines whether the corrected test target sound is normal by comparing the corrected test target sound with a predetermined test reference sound.

9. A test target sound determination program that causes a computer to execute the test target sound determination method according to claim 1.

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