Information processing device, control method therefor, and program

Abstract

To enable more effective reduction of noise caused by air column resonance.SOLUTION: An information processing device 10 is provided, comprising a control unit 11 configured to generate canceling sound for canceling air column resonance noise caused by air column resonance occurring in a space between grooves of tires 51, 52 of a vehicle 50 and a road surface G in contact with the tires 51, 52 according to shapes of contact between the tires 51, 52 and the road surface G, and output the generated canceling sound from a speaker 16.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an information processing apparatus, a control method thereof, and a program.

Background Art

[0002] In order to reduce the noise generated as a vehicle travels, it is known to output a cancellation sound for canceling the noise. For example, Patent Document 1 describes adjusting a cancellation sound for canceling road noise that enters a vehicle compartment according to the road surface condition in front of the vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional configuration has room for improvement in reducing the noise caused by the air column resonance in the space formed by the groove in the tire tread pattern and the ground.

[0005] An object of the present disclosure is to more effectively reduce the noise caused by air column resonance.

Means for Solving the Problems

[0006] (1) An information processing apparatus according to an embodiment of the present disclosure generates a cancellation sound for canceling the air column resonance sound generated due to the air column resonance in the space between the groove portion of the vehicle tire and the road surface with which the tire is in contact, based on the grounding shape in which the tire is in contact with the road surface, causes the generated cancellation sound to be output to a speaker, and includes a control unit. According to such a configuration, since a cancellation sound for canceling the column resonance sound is output from the speaker, it is possible to reduce the annoying column resonance sound.

[0007] (2) As an embodiment of the present disclosure, in (1), the control unit acquires voice information of noise generated during running of the vehicle detected by the microphone, analyzes the voice information to acquire a column resonance sound generated due to column resonance in a space between the groove portion of the tire and the road surface with which the tire is in contact, and may generate a voice for canceling the acquired column resonance sound as the cancellation sound. According to such a configuration, since a cancellation sound for canceling the column resonance sound detected based on voice information is output from the speaker, it is possible to effectively reduce the annoying column resonance sound.

[0008] (3) As an embodiment of the present disclosure, in (1) or (2), the control unit determines a frequency based on a contact length of the tire with the road surface, and may generate the cancellation sound including the determined frequency. According to such a configuration, since a cancellation sound including a frequency corresponding to the contact length of the tire with the road surface is generated, it is possible to effectively reduce the column resonance sound even without a microphone.

[0009] (4) As an embodiment of the present disclosure, in (3), the control unit acquires the contact length of the tire with the road surface based on at least one of the weight of the vehicle and the internal pressure of the tire, and may determine the frequency based on the acquired contact length. According to such a configuration, even if the weight of the vehicle and the internal pressure of the tire change, it is possible to effectively reduce the column resonance sound.

[0010] (5) As one embodiment of the present disclosure, in (3) or (4), The control unit may input the obtained contact length as an explanatory variable to a learned model learned using the contact length of the tire in contact with the road surface as the explanatory variable and the peak frequency of the air column resonance sound of the tire as the target variable, and determine the frequency. According to such a configuration, since the frequency included in the cancellation sound is determined using a learned model learned using the contact length as an explanatory variable and the peak frequency of the air column resonance sound of the tire as the target variable, it is possible to effectively reduce the air column resonance sound.

[0011] (6) As one embodiment of the present disclosure, in any one of (3) to (5), The control unit may further determine the frequency based on the shape of the tread pattern of the tire. According to such a configuration, since the frequency included in the cancellation sound is determined based on the shape of the tread pattern of the tire, it is possible to effectively reduce the air column resonance sound.

[0012] (7) As one embodiment of the present disclosure, in any one of (1) to (6), The control unit acquires voice information of the observed sound generated during the running of the vehicle detected by a microphone, and may correct the cancellation sound based on the voice information. According to such a configuration, it is possible to further effectively reduce the air column resonance sound by verifying whether the cancellation of the air column resonance sound by the cancellation sound is effectively performed and correcting the cancellation sound.

[0013] (8) The control method of the information processing apparatus according to one embodiment of the present disclosure is a control method of an information processing apparatus including a control unit, wherein the control unit A step of generating a cancellation sound for canceling the air column resonance sound generated due to the air column resonance in the space between the groove portion of the tire of the vehicle and the road surface with which the tire is in contact, based on the contact shape of the tire with the road surface; A step of causing the generated cancellation sound to be output from a speaker; and includes. According to such a configuration, since the cancellation sound for canceling the air column resonance sound is output from the speaker, it is possible to reduce the annoying air column resonance sound.

[0014] (9) A program according to an embodiment of the present disclosure causes a computer to operate as the information processing apparatus according to any one of (1) to (7). According to such a configuration, since the cancellation sound for canceling the air column resonance sound is output from the speaker, it is possible to reduce the annoying air column resonance sound.

Effect of the Invention

[0015] According to an embodiment of the present disclosure, noise caused by air column resonance can be more effectively reduced.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0017] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, parts having the same configuration or function are denoted by the same reference numerals. In the description of this embodiment, redundant descriptions may be omitted or simplified as appropriate for the same parts.

[0018] FIG. 1 is a diagram showing an example of a vehicle 50 equipped with an information processing apparatus 10 according to an embodiment. The information processing apparatus 10 outputs a cancellation sound for canceling noise generated as the vehicle 50 travels, thereby reducing the noise in the vehicle interior.

[0019] The information processing apparatus 10 includes a microphone 15, a speaker 16, an acceleration sensor 17, and a calculation unit 19.

[0020] The microphone 15 detects voice information of noise in the vehicle interior of the vehicle 50. The microphone 15 may be provided, for example, near the seat of the vehicle 50. The information processing apparatus 10 may generate a cancellation sound for canceling the noise by inverting the phase of the voice information of the noise detected by the microphone 15. In a state where the cancellation sound is being output, the information processing apparatus 10 may use the voice information in the vehicle interior acquired by the microphone 15 for evaluating the effect of noise cancellation.

[0021] The speaker 16 outputs the cancellation sound as sound waves. The speaker 16 may be realized by a voice output device of an audio system originally provided in the vehicle 50.

[0022] The acceleration sensor 17 measures the acceleration of the vehicle 50. The measured value of the acceleration sensor 17 is used for the evaluation of NVH (Noise, Vibration and Harshness). The acceleration sensor 17 may be realized by a sensor of any method such as a semiconductor gauge, a capacitance, or a differential transformer type. The acceleration sensor 17 may be attached, for example, to an axle that transmits the power generated by a drive unit such as an engine, a motor, or a combination thereof to the tires 51, 52.

[0023] The arithmetic unit 19 is connected to the microphone 15, the speaker 16, and the acceleration sensor 17, and controls the operations of these devices. As will be described later with reference to FIG. 2, the arithmetic unit 19 includes a control unit 11, a storage unit 12, and a communication unit 13.

[0024] The vehicle 50 is, for example, an automobile such as a passenger car, but is not limited thereto and may be any vehicle. The automobile is, for example, a gasoline vehicle, a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, or a battery electric vehicle, but is not limited thereto. The vehicle 50 includes tires 51, 52.

[0025] A communication device 53 is provided on the tire 51. A communication device 54 is provided on the tire 52.

[0026] The communication devices 53, 54 perform wireless communication. The communication devices 53, 54 are, for example, RF (Radio Frequency) tags. The RF tag is also called an RFID (Radio Frequency Identification) tag. The communication devices 53, 54 include an IC (Integrated Circuit) chip that constitutes a control unit and a storage unit, and one or more antennas connected to the IC chip. The IC chip may store any information regarding the tires 51, 52, such as identification information of the tires 51, 52, the manufacturing date, the circumferential length, the number of pitches per revolution, and the correspondence between the contact length between the tires 51, 52 and the road surface G and the peak frequency of the air column resonance sound. The pitch is a groove in the width direction formed on the surface of the tires 51, 52. For example, the communication devices 53, 54 may be provided such that two antennas extending linearly, wavily, or spirally extend from the IC chip in opposite directions to each other, and the entire device may have a longitudinal shape.

[0027] The IC chip may operate based on the dielectric electromotive force generated by electromagnetic waves received by one or more antennas. That is, the communication devices 53 and 54 may be passive communication devices. Alternatively, the communication devices 53 and 54 may further include a battery and be capable of generating electromagnetic waves with their own power for communication. That is, the communication devices 53 and 54 may be active communication devices.

[0028] The information processing device 10 generates a cancellation sound for canceling the column resonance sound generated due to column resonance in the space between the groove portions of the tires 51 and 52 of the vehicle 50 and the road surface G, based on the grounding shape in which the tires 51 and 52 are in contact with the road surface G. The information processing device 10 causes the generated cancellation sound to be output to the speaker 16. By performing such noise cancellation of the column resonance sound, according to the information processing device 10, it is possible to reduce the annoying column resonance sound.

[0029] FIG. 2 is a block diagram showing a configuration example of the information processing device 10. As described above, the information processing device 10 includes a microphone 15, a speaker 16, an acceleration sensor 17, and an arithmetic unit 19. The arithmetic unit 19 includes a control unit 11, a storage unit 12, and a communication unit 13. The arithmetic unit 19 is one or a plurality of computer devices capable of communicating with each other. The arithmetic unit 19 is not limited to these, and may be any general-purpose electronic device such as an FPGA (Field Programmable Gate Array), a single board computer (SBC), or a PC (Personal Computer), or other dedicated electronic devices.

[0030] The control unit 11 includes one or more processors. In one embodiment, the "processor" is a general-purpose processor or a dedicated processor specialized for a specific process, but is not limited thereto. The control unit 11 is communicably connected to each component constituting the information processing device 10 and controls the operation of the entire information processing device 10.

[0031] The storage unit 12 includes any storage module such as, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), a ROM (Read-Only Memory), and a RAM (Random Access Memory). The storage unit 12 may function as, for example, a main storage device, an auxiliary storage device, or a cache memory. The storage unit 12 stores any information used for the operation of the information processing apparatus 10. For example, the storage unit 12 may store a system program, an application program, and various information received by the communication unit 13. The storage unit 12 is not limited to being built into the information processing apparatus 10, and may be an external database or an external storage module.

[0032] The communication unit 13 includes any communication module that can be communicatively connected to other devices such as a scanner by any communication technology. The communication unit 13 may further include a communication control module for controlling communication with other devices and a storage module for storing communication data such as identification information necessary for communication with other devices.

[0033] The functions of the information processing apparatus 10 can be realized by executing a computer program (program) according to the present embodiment on a processor included in the control unit 11. That is, the functions of the information processing apparatus 10 can be realized by software. The computer program causes a computer to execute the processing of the steps included in the operation of the information processing apparatus 10, thereby causing the computer to realize the functions corresponding to the processing of each step. That is, the computer program is a program for causing a computer to function as the information processing apparatus 10 according to the present embodiment. The computer program may be recorded on a computer-readable recording medium. The program includes information for use in processing by an electronic computer and that conforms to the program. For example, data that is not a direct instruction to a computer but has the property of defining the processing of the computer corresponds to "information conforming to the program".

[0034] Some or all of the functions of the information processing apparatus 10 may be realized by a dedicated circuit included in the control unit 11. That is, some or all of the functions of the information processing apparatus 10 may be realized by hardware. Further, the information processing apparatus 10 may be realized by a single computer or may be realized by the cooperation of a plurality of computers.

[0035] FIG. 3 is a flowchart showing an example of the operation procedure of the information processing apparatus 10. The operation of the information processing apparatus 10 described with reference to FIG. 3 may correspond to one of the control methods of the information processing apparatus 10. The operations of each step in FIG. 3 may be executed based on the control by the control unit 11 of the information processing apparatus 10.

[0036] In step S1, the control unit 11 generates a cancellation sound for canceling the column resonance sound generated due to column resonance in the space between the groove portions of the tires 51 and 52 of the vehicle 50 and the road surface G with which the tires 51 and 52 are in contact. The column resonance sound is a sound generated by the resonance of the air column formed between the groove portions of the tires 51 and 52 and the road surface G. Therefore, the control unit 11 generates based on the contact shape of the tires 51 and 52 with the road surface G.

[0037] Specifically, the control unit 11 may determine a frequency based on the contact shape of the tires 51 and 52 with the road surface G and generate a cancellation sound including the determined frequency. FIG. 4 is a schematic diagram showing an example of the frequency spectrum of the column resonance sound. In FIG. 4, the horizontal axis indicates the frequency and the vertical axis indicates the intensity of the sound wave. The graph 61 shows the frequency spectrum of the column resonance sound. As shown by the graph 61, the frequency of the column resonance sound has a peak near 1 kHz. And the peak frequency of the column resonance sound mainly varies according to the length of the tread in the circumferential direction of the tires 51 and 52 in contact with the road surface G.

[0038] FIG. 5 is a diagram showing an example of the contact portion between tires 51 and 52 and the road surface G. In the example of FIG. 5, the tires 51 and 52 are in contact with the road surface G with a length (contact length) L. Therefore, the peak frequency of the air column resonance sound of the tires 51 and 52 is determined based on L. Thus, the control unit 11 may measure in advance the relationship between the length L and the peak frequency of the air column resonance sound, and store it in the storage unit 12 as corresponding information. In step S1, the control unit 11 may refer to this corresponding information, obtain the peak frequency of the air column resonance sound from the length L of the contact surface between the tires 51 and 52 and the road surface G, and generate a sound including the peak frequency as a cancellation sound. The control unit 11 may refer to the correspondence relationship thus obtained, obtain the peak frequency of the air column resonance sound from the length L of the contact surface between the tires 51 and 52 and the road surface G, and generate a sound including the peak frequency as a cancellation sound. In this way, the information processing device 10 can effectively reduce the air column resonance sound even without the microphone 15 by generating a cancellation sound including a frequency corresponding to the length L that the tires 51 and 52 are in contact with the road surface G.

[0039] Also, the length L that the tires 51 and 52 are in contact with the road surface G is determined by various factors such as the weight of the vehicle 50 and the internal pressure of the tires 51 and 52. Thus, the control unit 11 may obtain the length L that the tires 51 and 52 are in contact with the road surface G based on at least one of the weight of the vehicle 50 and the internal pressure of the tires 51 and 52, and determine the frequency of the cancellation sound based on the obtained length L. According to such a configuration, even when it is difficult to directly measure the length L, the information processing device 10 can generate an appropriate cancellation sound for canceling the air column resonance sound based on the weight of the vehicle 50 and the internal pressure of the tires 51 and 52, etc. Therefore, the information processing device 10 can effectively reduce the air column resonance sound by the cancellation effect of the cancellation sound.

[0040] In addition, the control unit 11 may acquire and analyze the audio information of the noise generated during the running of the vehicle 50 detected by the microphone 15, and acquire the column resonance sound generated due to the column resonance in the space between the groove portions of the tires 51 and 52 and the road surface G with which the tires 51 and 52 are in contact. The control unit 11 may generate, as a cancellation sound, a sound for canceling the acquired column resonance sound. In this way, since the information processing device 10 outputs, from the speaker 16, a cancellation sound for canceling the column resonance sound detected based on the audio information, it is possible to effectively reduce the annoying column resonance sound. Further, the control unit 11 may determine a frequency range in which a peak frequency may exist based on the length L or the like, and analyze the audio information by narrowing down to that frequency range. By limiting the frequency range to be analyzed in this way, it is possible to execute efficient processing.

[0041] The control unit 11 may input the acquired length L to a learned model that is learned with the length L in which the tires 51 and 52 are in contact with the road surface G as an explanatory variable and the peak frequency of the column resonance sound of the tires 51 and 52 as an objective variable, and determine the frequency. By determining the frequency included in the cancellation sound using such a learned model, the information processing device 10 can effectively reduce the column resonance sound.

[0042] As described above, the peak frequency of the column resonance sound mainly varies according to the length L of the circumferential tread of the tires 51 and 52 in contact with the road surface G, but may also be affected by the tread in the width direction of the tires 51 and 52. Therefore, the control unit 11 may determine the peak frequency of the cancellation sound based on the shape of the tread pattern of the tires 51 and 52. In this way, by determining the frequency included in the cancellation sound based also on the shape of the tread pattern of the tires 51 and 52, the information processing device 10 can effectively reduce the column resonance sound.

[0043] In step S2, the control unit 11 causes the speaker 16 to output the cancellation sound generated in step S1.

[0044] In step S3, the control unit 11 acquires the audio information of the observed sound in the passenger compartment by means of the microphone 15.

[0045] In step S4, the control unit 11 corrects the cancellation sound based on the audio information of the observed sound acquired in step S3.

[0046] In step S5, the control unit 11 causes the speaker 16 to output the cancellation sound corrected in step S4. After finishing the process of step S5, the control unit 11 ends the process of the flowchart.

[0047] As described above, the information processing device 10 generates a cancellation sound based on the grounding shape in which the tires 51, 52 contact the road surface G, and causes the speaker 16 to output it. Here, the information processing device 10 acquires the audio information of the observed sound generated during the running of the vehicle 50 detected by the microphone 15, and corrects the cancellation sound based on the audio information. In this way, the information processing device 10 can more effectively reduce the column resonance sound by verifying whether the cancellation of the column resonance sound by the cancellation sound is effectively performed and correcting the cancellation sound.

[0048] The present disclosure is not limited to the above-described embodiments. For example, a plurality of blocks described in the block diagram may be integrated, or one block may be divided. Instead of executing a plurality of steps described in the flowchart in time series according to the description, they may be executed in parallel or in a different order according to the processing ability of the device that executes each step or as necessary. In addition, changes can be made without departing from the spirit of the present disclosure. [Contribution to the Sustainable Development Goals (SDGs) led by the United Nations]

[0049] SDGs have been proposed towards the realization of a sustainable society. One embodiment of the present invention can be considered as a technology that contributes to "No. 9 - Build the foundation of industry and technological innovation", etc.

Description of Reference Numerals

[0050] 10 Information processing device 11 Control unit 12 Memory unit 13 Communication unit 14 Camera 15 Microphone 16 Speaker 17 Acceleration sensor 19 Arithmetic unit 50 Vehicle 51, 52 Tires 53, 54 Communication devices 61 Graph G Road surface

Claims

1. A canceling sound for canceling a column resonance sound generated due to column resonance in a space between a groove portion of a tire of a vehicle and a road surface with which the tire is in contact is generated based on a grounding shape in which the tire is in contact with the road surface, and the generated canceling sound is output to a speaker, An information processing apparatus including a control unit.

2. The control unit acquires voice information of noise generated during traveling of the vehicle detected by a microphone, analyzes the voice information to acquire a column resonance sound generated due to column resonance in a space between the groove portion of the tire and the road surface with which the tire is in contact, generates a voice for canceling the acquired column resonance sound as the canceling sound, The information processing apparatus according to claim 1.

3. The control unit determines a frequency based on a grounding length in which the tire is in contact with the road surface, generates the canceling sound including the determined frequency, The information processing apparatus according to claim 1.

4. The control unit acquires the grounding length in which the tire is in contact with the road surface based on at least one of the weight of the vehicle and the internal pressure of the tire, determines the frequency based on the acquired grounding length, The information processing apparatus according to claim 3.

5. The control unit inputs the acquired grounding length to a learned model learned with the grounding length in which the tire is in contact with the road surface as an explanatory variable and the peak frequency of the column resonance sound of the tire as an objective variable, and determines the frequency. The information processing apparatus according to claim 3.

6. The control unit further determines the frequency based on the shape of the tread pattern of the tire. The information processing apparatus according to claim 3.

7. The control unit acquires voice information of observed sound generated during traveling of the vehicle detected by a microphone, corrects the canceling sound based on the voice information, The information processing apparatus according to claim 1.

8. A control method for an information processing apparatus including a control unit, wherein the control unit generates a canceling sound for canceling a column resonance sound generated due to column resonance in a space between a groove portion of a tire of a vehicle and a road surface with which the tire is in contact based on a grounding shape in which the tire is in contact with the road surface; and outputs the generated canceling sound to a speaker, The control method for an information processing apparatus including these steps.

9. A program for causing a computer to operate as the information processing apparatus according to any one of claims 1 to 7.

Images