Noise cancelling method, information processing device and program

Abstract

To improve a noise cancelling technique.SOLUTION: A noise canceling method executed by an information processing device 10, includes the steps of: estimating cavity resonance sound on the basis of tire characteristic information; generating cancellation sound of the cavity resonance sound; and emitting the cancellation sound from a speaker.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, noise cancellation techniques have been known to reduce noise generated as a vehicle travels. For example, Patent Document 1 discloses a low-noise pocket wheel house that suppresses the generation of a sound field due to tire pattern noise by forming a shield cover around a tire.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The prior art reduces noise (noise) by a wheel guard attached to a tire, but has not considered canceling noise by emitting a canceling sound. Thus, there has been room for improvement in noise cancellation technology.

[0005] In view of such circumstances, an object of the present disclosure is to improve noise cancellation technology for canceling external vehicle noise.

Means for Solving the Problems

[0006] (1) A noise cancellation method according to an embodiment of the present disclosure is a noise cancellation method executed by an information processing apparatus, a step of collecting external vehicle noise from a directional microphone directed toward the ground contact surface of a tire, A step of generating a cancellation sound for the outside vehicle noise collected in the step of collecting sound; A step of emitting the cancellation sound from a speaker toward the ground contact surface; and includes. According to such a configuration, the information processing device can reduce the outside vehicle noise by emitting a sound that cancels it toward the vicinity of the source of the outside vehicle noise, and the noise cancellation technology is improved.

[0007] (2) The noise cancellation method according to an embodiment of the present disclosure is the noise cancellation method described in (1), wherein the microphone and the speaker are directed toward at least one of the depressed portion or the kicking-out portion of the tire. According to such a configuration, it is possible to collect a sound closer to the source of the outside vehicle noise, and the effect of noise cancellation can be enhanced.

[0008] (3) The noise cancellation method according to an embodiment of the present disclosure is the noise cancellation method described in (1) or (2), wherein the microphone and the speaker are installed at the lower end of the fender. According to such a configuration, it is possible to collect a sound closer to the source of the outside vehicle noise and emit a cancellation sound, and the effect of noise cancellation can be enhanced.

[0009] (4) The noise cancellation method according to an embodiment of the present disclosure is the noise cancellation method described in any one of (1) to (3), and further the tire is at least one or more of the rear wheels of the vehicle. According to such a configuration, by performing noise cancellation on the rear wheels that have a greater impact on the outside vehicle noise, the noise can be reduced.

[0010] (5) The noise cancellation method according to an embodiment of the present disclosure is a noise cancellation method executed by an information processing device, wherein A step of collecting external vehicle noise from a directional microphone directed toward the ground contact surface of the tire; A step of generating a cancellation sound for the external vehicle noise collected in the collecting step; A step of emitting the cancellation sound from a speaker toward the side of the vehicle body, and includes. According to such a configuration, by emitting a sound that cancels this toward the side where pedestrians and the like are present, the external vehicle noise with respect to pedestrians and the like can be reduced, and the effect of noise cancellation can be enhanced.

[0011] (6) The noise cancellation method according to an embodiment of the present disclosure is the noise cancellation method described in (5), wherein The microphone is a directional microphone directed toward at least one of the depressed portion or the kicking-out portion of the tire. According to such a configuration, by collecting the sound closer to the source of the external vehicle noise, the spectrum of the external vehicle noise can be accurately obtained, and the effect of noise cancellation can be enhanced.

[0012] (7) The noise cancellation method according to an embodiment of the present disclosure is the noise cancellation method described in (5) or (6), wherein The speaker is installed at the lower end of the side sill. According to such a configuration, the noise with respect to pedestrians and the like can be reduced, and the effect of noise cancellation can be enhanced.

[0013] (8) The information processing apparatus according to an embodiment of the present disclosure is an information processing apparatus including a processor, wherein The processor executes the noise cancellation method according to any one of (1) to (7). According to such a configuration, the noise cancellation method according to an embodiment of the present disclosure can be generally obtained in the form of an information processing apparatus that executes these, and the technology for canceling noise is improved.

[0014] (9) A program according to an embodiment of the present disclosure is A program executed by an information processing apparatus, which causes a computer to execute the noise cancellation method according to any one of (1) to (7). According to such a configuration, the noise cancellation method according to an embodiment of the present disclosure can be generally obtained in the form of a program that causes an information processing apparatus to execute these, and the technology for canceling noise is improved.

Effects of the Invention

[0015] According to the noise cancellation method, information processing apparatus, and program according to an embodiment of the present disclosure, it is possible to improve the technology for canceling pattern noise in particular.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0017] <Embodiment 1> Hereinafter, the noise cancellation technology according to Embodiment 1 of the present disclosure will be described with reference to the drawings.

[0018] In each figure, the same or corresponding parts are denoted by the same reference numerals. In the description of each embodiment, the description of the same or corresponding parts will be omitted or simplified as appropriate.

[0019] FIG. 1 is a diagram showing an example of a vehicle 50 equipped with an information processing apparatus 10 according to Embodiment 1. The information processing apparatus 10 outputs a cancellation sound for canceling noise (noise) generated as the vehicle 50 travels, thereby reducing external noise.

[0020] First, the outline of Embodiment 1 will be described. The noise cancellation technology according to Embodiment 1 is executed by the information processing apparatus 10. The noise cancellation technology according to Embodiment 1 can be used, for example, when canceling external noise. Specifically, in the noise cancellation technology according to Embodiment 1, the information processing apparatus 10 picks up external noise from a directional microphone directed toward the ground contact surface of the tire. The information processing apparatus 10 generates a cancellation sound for the picked-up external noise and emits this from a speaker toward the ground contact surface. Thereby, external noise can be reduced and the noise cancellation technology is improved.

[0021] Here, the external noise refers to noise observed outside (outside the vehicle compartment) among the noises generated as the vehicle travels. The external noise can include various noises. The external noise may include pattern noise. The pattern noise refers to noise radiated when the discontinuous portion of the tread pattern of the tire 51 collides with the road surface when it comes into contact with the ground and the tire 51 vibrates due to the impact force.

[0022] According to the noise cancellation technology according to Embodiment 1, it is possible to cancel out external vehicle noise. In other words, the information processing device 10 picks up external vehicle noise, generates a cancellation sound for the picked-up external vehicle noise, and emits it from the speaker. The information processing device 10 picks up external vehicle noise from a directional microphone directed toward the ground contact surface of the tire. Further, the information processing device 10 emits a cancellation sound from the speaker toward the ground contact surface. Thereby, external vehicle noise can be efficiently reduced.

[0023] As described above, according to the noise cancellation technology according to Embodiment 1, external vehicle noise can be efficiently reduced, and the noise cancellation technology is improved.

[0024] Hereinafter, the configuration according to an embodiment of the present disclosure will be described.

[0025] As shown in FIG. 1, the information processing device 10 includes a microphone 14 and a speaker 15. In FIG. 1, among the information processing device 10, the microphone 14 and the speaker 15 are particularly illustrated.

[0026] The microphone 14 detects audio information of noise outside the vehicle 50. The microphone 14 may be a directional microphone. The microphone 14 observes sounds audible from the direction of the ground contact surface of the tire. The microphone 14 may be provided, for example, at the lower end of the fender 52 of the vehicle 50 as will be described later with reference to FIG. 3. The information processing device 10 may invert the phase of the audio information of the noise detected by the microphone 14 to generate a cancellation sound for canceling the noise. In a state where the cancellation sound is being output, the information processing device 10 may use the audio information outside the vehicle acquired by the microphone 14 for evaluating the effect of noise cancellation.

[0027] Speaker 15 outputs the cancellation sound as sound waves. Speaker 15 may be a directional speaker. Speaker 15 emits the cancellation sound toward the ground contact surface of the tire or the side of the vehicle body. When Speaker 15 emits the cancellation sound toward the ground contact surface of the tire, for example, as will be described later with reference to FIG. 3, it may be provided at the lower end of the fender 52 of the vehicle 50. Further, when Speaker 15 emits the cancellation sound toward the side of the vehicle body, for example, as will be described later with reference to FIG. 5, it may be provided at the lower end of the side surface of the vehicle 50. When Speaker 15 emits the cancellation sound toward the side of the vehicle body, it may be provided at the lower end of the fender 52 so as to face the side direction of the vehicle 50. In addition to this, Speaker 15 can be installed at any location suitable for canceling external noise.

[0028] Note that the information processing device 10 may include a plurality of microphones 14 and a plurality of speakers 15. Further, the microphones 14 and the speakers 15 may be provided for some or all of the tires mounted on the vehicle 50. In other words, in FIG. 1, the microphones 14 and the speakers 15 are shown as being provided for the tire 51 (rear wheel), but this is not limiting. The microphones 14 and the speakers 15 may also be provided for the rear wheels, the front wheels, or both the front wheels and the rear wheels. Further, the microphones 14 and the speakers 15 may be provided for at least one or more tires of the rear wheels and at least one or more tires of the front wheels, rather than for each pair of rear wheels or each pair of front wheels.

[0029] 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 automobile, a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell automobile, or a battery electric vehicle, but is not limited thereto. The vehicle 50 includes tires 51. The vehicle 50 also includes fenders 52. The fenders 52 function to prevent collision of the tires 51 and remove mud.

[0030] (Configuration of the Information Processing Device) Next, each configuration of the information processing device 10 will be described in detail.

[0031] As shown in FIG. 2, the information processing apparatus 10 includes a microphone 14, a speaker 15, and an arithmetic unit 16.

[0032] The arithmetic unit 16 includes a control unit 11, a storage unit 12, and a communication unit 13. The arithmetic unit 16 is one or a plurality of computer devices that can communicate with each other. The arithmetic unit 16 is not limited thereto, 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. The arithmetic unit 16 is connected to the microphone 14 and the speaker 15 and controls the operations of these devices.

[0033] 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 apparatus 10 and controls the overall operation of the information processing apparatus 10.

[0034] The storage unit 12 includes, for example, any storage module such as 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.

[0035] The communication unit 13 includes an arbitrary 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.

[0036] The functions of the information processing apparatus 10 are realized by executing the program according to the present embodiment on a processor corresponding to the information processing apparatus 10. That is, the functions of the information processing apparatus 10 are realized by software. The program causes a computer to execute the operations of the information processing apparatus 10, thereby causing the computer to function as the information processing apparatus 10. That is, the computer functions as the information processing apparatus 10 by executing the operations of the information processing apparatus 10 according to the program.

[0037] In the present embodiment, the program can be recorded on a computer-readable recording medium. The computer-readable recording medium includes a non-transitory computer-readable medium, and is, for example, a magnetic recording device, an optical disk, a magneto-optical recording medium, or a semiconductor memory. The distribution of the program is performed, for example, by selling, transferring, or lending a portable recording medium such as a DVD (digital versatile disc) or a CD-ROM (compact disc read only memory) on which the program is recorded. The distribution of the program may also be performed by storing the program in the storage of an external server and transmitting the program from the external server to other computers. The program may also be provided as a program product.

[0038] Some or all of the functions of the information processing apparatus 10 may be realized by a dedicated circuit corresponding to the control unit 11. That is, some or all of the functions of the information processing apparatus 10 may be realized by hardware.

[0039] With reference to FIG. 3, an example of the arrangement of the microphone 14 and the speaker 15 will be described.

[0040] The microphone 14 is a directional microphone directed toward the ground contact surface 100 of the tire 51. The microphone 14 may be installed at the lower end of the fender 52 so as to face the ground contact surface 100 of the tire 51, for example, as shown in FIG. 3. Also, as shown in FIG. 3, a plurality of microphones 14 may be provided. The microphone 14 observes the external noise from the direction of the ground contact surface 100.

[0041] The speaker 15 may be installed at the lower end of the fender 52 so as to face the ground contact surface 100 of the tire 51, for example, as shown in FIG. 3. Also, as shown in FIG. 3, a plurality of speakers 15 may be provided. The speaker 15 emits a cancellation sound toward the ground contact surface 100.

[0042] In particular, as shown in FIG. 3, the microphone 14 and the speaker 15 may be installed respectively toward the indentation portion 101 of the tire 51, the kick-out portion 102 of the tire 51, or both. The relationship between the indentation portion 101 of the tire 51, the kick-out portion 102 of the tire 51, and the ground contact surface 100 will be described later with reference to FIG. 4.

[0043] As shown in FIG. 3, the microphone 14 and the speaker 15 may be arranged side by side on the fender 52. The arrangement may be along the traveling direction, as shown in FIG. 3. Also, the arrangement may be in a direction perpendicular to the traveling direction. In other words, the microphone 14 and the speaker 15 may be arranged in front of and behind the fender 52. The microphone 14 and the speaker 15 may be installed at any other location suitable for canceling external noise.

[0044] With reference to FIG. 4, the relationship between the ground contact surface 100 of the tire 51, the indentation portion 101 of the tire 51, and the kick-out portion 102 of the tire 51 will be described. In FIG. 4, the traveling direction of the vehicle 50 is to the right.

[0045] The ground contact surface 100 of the tire 51 is the surface that contacts the road surface when the tire 51 is running. The ground contact surface 100 moves in the direction of the traveling direction of the vehicle 50 as the tire 51 rotates during the running of the vehicle 50.

[0046] The indentation portion 101 of the tire 51 is a part of the tire 51, and refers to a portion that enters the ground contact surface 100 ahead and leaves the ground contact surface 100 ahead as the tire 51 rotates. In other words, the indentation portion 101 of the tire 51 hits the side of the ground contact surface 100 on the advancing direction (front) side of the vehicle 50. When the indentation portion 101 of the tire 51 is illustrated from above the vehicle 50, it hits the right side portion of the ground contact surface 100 as shown in the enlarged top view of FIG. 4.

[0047] The kick-out portion 102 of the tire 51 is a part of the tire 51, and refers to a portion that enters the ground contact surface 100 behind and leaves the ground contact surface 100 behind as the tire 51 rotates. In other words, the kick-out portion 102 of the tire 51 hits the side of the ground contact surface 100 on the opposite (rear) side of the advancing direction of the vehicle 50. When the kick-out portion 102 of the tire 51 is illustrated from above the vehicle 50, it hits the left side portion of the ground contact surface 100 as shown in the enlarged top view of FIG. 4.

[0048] For example, the microphone 14 and the speaker 15 may be installed facing the indentation portion 101 shown in FIG. 4. When the microphone 14 and the speaker 15 are installed at the lower end of the fender 52, the indentation portion 101 in the enlarged top view of FIG. 4 may be observed from the upper right direction. Also, the microphone 14 and the speaker 15 may be installed facing the kick-out portion 102 shown in FIG. 4. When the microphone 14 and the speaker 15 are installed at the lower end of the fender 52, the kick-out portion 102 in the enlarged top view of FIG. 4 may be observed from the upper left direction.

[0049] Referring to the flowchart of FIG. 5, the content of the noise canceling method according to the present embodiment is shown.

[0050] Step S101: The control unit 11 of the information processing apparatus 10 picks up the outside vehicle noise from the directional microphone 14 directed toward the ground contact surface 100 of the tire 51. In other words, the control unit 11 picks up the outside vehicle noise from the direction of the ground contact surface 100 of the tire 51. For example, as shown in FIG. 3, the control unit 11 may pick up the outside vehicle noise from the microphone 14 directed toward the ground contact surface 100 of the tire 51.

[0051] Step S102: The control unit 11 generates a cancellation sound for the outside vehicle noise. For example, the control unit 11 generates a cancellation sound corresponding to the spectrum in order to cancel the spectrum of the outside vehicle noise picked up in Step S101. By making the cancellation sound correspond to the spectrum of the picked-up outside vehicle noise, the outside vehicle noise can be appropriately canceled out.

[0052] Step S103: The control unit 11 emits the cancellation sound from the speaker 15 toward the ground contact surface 100. For example, the control unit 11 emits the cancellation sound generated in Step S102 from the speaker 15. For example, as shown in FIG. 3, the control unit 11 may emit the cancellation sound from the speaker 15 toward the ground contact surface 100.

[0053] As described above, according to the noise cancellation technology according to the present embodiment, the information processing apparatus 10 picks up the outside vehicle noise from the directional microphone 14 directed toward the ground contact surface 100 of the tire 51, generates a cancellation sound for canceling this, and emits it from the speaker 15 toward the ground contact surface 100. Thereby, the outside vehicle noise can be reduced, and the noise cancellation technology is improved.

[0054] Further, the microphone 14 and the speaker 15 may be directed toward at least one of the indentation portion 101 or the kick-out portion 102. In other words, the microphone 14 may be directed toward at least one of the indentation portion 101 or the kick-out portion 102 of the ground contact surface 100 in order to more accurately acquire the spectrum of the outside vehicle noise. Further, the speaker 15 may be installed in the same direction as the microphone 14 in order to cancel the sound picked up by the microphone 14.

[0055] Furthermore, the microphone 14 and the speaker 15 may be installed at a position close to the ground plane 100, such as the lower end of the fender 52. Here, the lower end of the fender 52 refers to a portion that is below the fender 52 and hits the bottom of the vehicle 50 (the portion substantially parallel to the road surface). In other words, the lower end of the fender 52 can be located on the back side of the vehicle 50. By installing the microphone 14 and the speaker 15 at a position close to the ground plane 100 in this way, the microphone 14 and the speaker 15 can effectively cancel the external noise generated from the ground plane 100. Note that the position where the microphone 14 and the speaker 15 are installed is not limited to the lower end of the fender 52, and may be any outer surface of the vehicle body within a predetermined distance (for example, within 100 cm) from the stepped portion 101 or the kick-out portion 102.

[0056] Note that the target tire 51 for which the cancellation sound is emitted may be at least one or more of the rear wheels of the vehicle. By applying this technology to the rear wheels of the vehicle, which have a greater impact on external noise, the external noise can be reduced more effectively.

[0057] <Embodiment 2> Next, Embodiment 2 will be described. FIG. 6 is a diagram showing a vehicle 50 equipped with the information processing apparatus 10 according to Embodiment 2. The information processing apparatus 10 outputs a cancellation sound for canceling the noise (noise) generated as the vehicle 50 travels, thereby reducing the external noise. The same components as those in Embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted. The technology according to Embodiment 2 differs from that according to Embodiment 1 in the position where the speaker is installed.

[0058] First, an overview of Embodiment 2 will be described. The noise cancellation technology according to Embodiment 2 is executed by the information processing apparatus 10. The noise cancellation technology according to Embodiment 2 can be used, for example, when canceling external noise. Specifically, in the noise cancellation technology according to Embodiment 2, the information processing apparatus 10 picks up external noise from a directional microphone directed toward the ground contact surface of the tire. The information processing apparatus 10 generates a cancellation sound for the picked-up external noise and emits this from a speaker toward the side of the vehicle body. Thereby, the external noise can be reduced and the noise cancellation technology is improved.

[0059] Specifically, as shown in FIG. 6, the speaker 15b according to Embodiment 2 may be provided at the lower end of the side surface of the vehicle 50. The lower end of the side surface of the vehicle 50 may be the lower end of the side sill (which may also be referred to as a door sill or a rocker panel). Here, the lower end of the side surface of the vehicle 50 or the lower end of the side sill each refers to a portion below the side surface of the vehicle 50 or the side sill and hitting the bottom of the vehicle 50 (a portion substantially parallel to the road surface). In other words, the lower end of the side surface of the vehicle 50 or the lower end of the side sill may be located on the back side of the vehicle 50. The specific position of the speaker 15b may be adjusted to a position suitable for canceling the external noise during traveling.

[0060] Next, a specific example of the noise cancellation method according to Embodiment 2 will be shown with reference to the flowchart of FIG. 7.

[0061] Step S201: The control unit 11 of the information processing apparatus 10 picks up external noise from the directional microphone 14 directed toward the ground contact surface 100 of the tire 51.

[0062] Step S202: The control unit 11 generates a cancellation sound for the external noise. For example, the control unit 11 generates a cancellation sound corresponding to the spectrum in order to cancel the spectrum of the external noise picked up in Step S101. By making the cancellation sound correspond to the spectrum of the picked-up external noise, the external noise can be appropriately canceled out.

[0063] Step S203: The control unit 11 emits the canceling sound from the speaker 15b toward the side of the vehicle body. For example, the control unit 11 emits the canceling sound generated in step S102 from the speaker 15b. Here, the side of the vehicle body refers to the direction perpendicular to the traveling direction of the vehicle 50. The side of the vehicle body may be the direction in which pedestrians are present. For example, as shown in FIG. 5, the control unit 11 may emit the canceling sound from the speaker 15b installed at the lower end of the side surface of the vehicle 50 toward the side of the vehicle body.

[0064] Thus, according to the noise canceling technology according to Embodiment 2, the information processing device 10 picks up the outside vehicle noise from the directional microphone 14 directed toward the ground contact surface 100 of the tire 51, generates a canceling sound to cancel this, and emits it from the speaker 15b toward the side of the vehicle body. Thereby, the outside vehicle noise can be reduced, and the noise canceling technology is improved.

[0065] In the above case, the microphone 14 may be directed toward at least one of the indentation portion 101 or the kicking portion 102. In other words, the microphone 14 may be directed toward at least one of the indentation portion 101 or the kicking portion 102 of the ground contact surface 100 in order to more accurately acquire the spectrum of the outside vehicle noise. The speaker 15b may be directed toward the side of the vehicle body in order to reduce the outside vehicle noise for pedestrians.

[0066] Also, the speaker 15b may be installed at the lower end of the side sill. In other words, the speaker 15b may be installed at the lower end of the side sill at an angle facing the side of the vehicle body. By doing so, the outside vehicle noise for pedestrians can be reduced.

[0067] Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included within the scope of the present disclosure. For example, the functions and the like included in each means or each step can be rearranged so as not to be logically inconsistent, and a plurality of means or steps can be combined into one or divided.

[0068] [Contribution to the United Nations Sustainable Development Goals (SDGs)] The SDGs have been proposed towards the realization of a sustainable society. One embodiment of the present invention can be a technology that contributes to "No. 9 - Build the foundation for industry and technological innovation" and the like.

Explanation of Reference Numerals

[0069] 10 Information processing apparatus 11 Control unit 12 Storage unit 13 Communication unit 14 Microphone 15 Speaker 15b Speaker 16 Arithmetic unit 50 Vehicle 51 Tire 52 Fender 100 Ground contact surface 101 Depression portion 102 Kicking-out portion

Claims

1. A noise cancellation method executed by an information processing apparatus, comprising: a step of collecting external noise from a directional microphone directed toward the ground contact surface of a tire; a step of generating a cancellation sound for the external noise collected in the collecting step; a step of emitting the cancellation sound from a speaker toward the ground contact surface; The noise cancellation method comprising the above steps.

2. The noise cancellation method according to claim 1, further comprising: The noise cancellation method, wherein the microphone and the speaker are directed toward at least one of the depression portion or the kick-out portion of the tire.

3. The noise cancellation method according to claim 2, wherein: The noise cancellation method, wherein the microphone and the speaker are installed at the lower end of a fender.

4. The noise cancellation method according to claim 3, wherein: The noise cancellation method, wherein the tire is at least one of the rear wheels of a vehicle.

5. A noise cancellation method executed by an information processing apparatus, comprising: a step of collecting external noise from a directional microphone directed toward the ground contact surface of a tire; a step of generating a cancellation sound for the external noise collected in the collecting step; a step of emitting the cancellation sound from a speaker toward the side of a vehicle body; The noise cancellation method comprising the above steps.

6. The noise cancellation method according to claim 5, wherein: The noise cancellation method, wherein the microphone is a directional microphone directed toward at least one of the depression portion or the kick-out portion of the tire.

7. The noise cancellation method according to claim 6, wherein: The noise cancellation method, wherein the speaker is installed at the lower end of a side sill.

8. An information processing apparatus comprising a processor that executes the noise cancellation method according to any one of claims 1 to 7.

9. A program for causing an information processing apparatus to execute the noise cancellation method according to any one of claims 1 to 7.

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