Information processing device, control method therefor, and program

Abstract

To enable more effective reduction of noise comprising various types of noise.SOLUTION: An information processing device 10 is provided, comprising a control unit 11 configured to acquire road surface information indicative of the condition of a road surface G on which a vehicle 50 is traveling, determining the levels of priority of a first canceling sound for canceling a first type of noise associated with running of the vehicle 50 and a second canceling sound for canceling a second type of noise associated with running of the vehicle on the basis of the road surface information, and weighting the sounds according to the determined levels of priority to output the first canceling sound and the second 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 conditions 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, in addition to road noise, other types of noise such as pattern noise may enter the vehicle compartment. The conventional configuration has room for improvement in effectively reducing the noise that enters with various types of noise mixed therein according to the situation.

[0005] An object of the present disclosure is to more effectively reduce noise in which various types of noise are mixed.

Means for Solving the Problems

[0006] (1) An information processing apparatus according to an embodiment of the present disclosure acquires road surface information indicating the conditions of the road surface on which the vehicle travels, based on the road surface information, determines the priorities of a first cancellation sound for canceling a first type of noise generated as the vehicle travels and a second cancellation sound for canceling a second type of noise, Perform weighting based on the determined priority and output the first cancellation sound and the second cancellation sound to the speaker. It includes a control unit. According to such a configuration, since weighting is performed based on the priority determined based on the road surface information and the first cancellation sound and the second cancellation sound are output, it is possible to effectively reduce the noise reaching the passenger compartment according to the road surface condition.

[0007] (2) As one embodiment of the present disclosure, in (1), The control unit may determine whether the road surface is a good road or a bad road based on the road surface information and determine the priority. According to such a configuration, since the priority of the cancellation sound to be used is determined based on the quality of the road surface, it is possible to effectively reduce the noise according to the road surface condition.

[0008] (3) As one embodiment of the present disclosure, in (2), When the road surface is determined to be a good road, the control unit may more preferentially output a cancellation sound for canceling the pattern noise caused by the tread pattern of the vehicle tire as the first cancellation sound. According to such a configuration, when driving on a good road with few irregularities, since a cancellation sound for canceling the pattern noise, whose proportion in the overall noise is relatively large, is more preferentially output, it is possible to effectively reduce the noise.

[0009] (4) As one embodiment of the present disclosure, in (2) or (3), When the road surface is determined to be a bad road, the control unit may more preferentially output a cancellation sound for canceling the road noise caused by the unevenness of the road surface as the first cancellation sound. According to such a configuration, when traveling on a rough road with unevenness, in order to more preferentially output a cancellation sound for canceling road noise whose proportion in the overall noise becomes relatively large, it is possible to effectively reduce the noise.

[0010] (5) As one embodiment of the present disclosure, in any one of (2) to (4), the control unit acquires a captured image of the road surface in the traveling direction of the vehicle as the road surface information, analyzes the captured image to determine whether the road surface is a good road or a bad road, and may determine the priority. According to such a configuration, in order to determine whether the road surface is a good road or a bad road based on the captured image of the road surface on which the vehicle will travel in the future, it is possible to quickly follow the change in the road surface condition and reduce the noise.

[0011] (6) As one embodiment of the present disclosure, in any one of (2) to (5), the control unit acquires voice information detected by a microphone as the road surface information, analyzes the voice information to determine whether the road surface is a good road or a bad road, and may determine the priority. According to such a configuration, since the microphone for acquiring voice information can be shared with the microphone for generating a cancellation sound for canceling noise, it is possible to quickly follow the change in the road surface condition and reduce the noise without providing an additional configuration.

[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 traveling of the vehicle detected by a microphone, and may correct the first cancellation sound and the second cancellation sound based on the voice information. According to such a configuration, by verifying whether the noise cancellation by the first cancellation sound and the second cancellation sound is effectively performed and correcting the first cancellation sound and the second cancellation sound, it is possible to further effectively reduce the noise.

[0013] (8) A control method for an information processing apparatus according to an embodiment of the present disclosure is a control method for an information processing apparatus including a control unit, wherein the control unit acquires road surface information indicating the state of the road surface on which the vehicle travels; determines the priorities of a first cancellation sound for canceling a first type of noise and a second cancellation sound for canceling a second type of noise, which are generated as the vehicle travels, based on the road surface information; performs weighting based on the determined priorities, and causes the first cancellation sound and the second cancellation sound to be output from a speaker. According to such a configuration, by performing weighting based on the priorities determined based on the road surface information and outputting the first cancellation sound and the second cancellation sound, it is possible to effectively reduce the noise reaching the passenger compartment according to the state of the road surface.

[0014] (9) A program according to an embodiment of the present disclosure is a program that causes a computer to operate as the information processing apparatus according to any one of (1) to (7). According to such a configuration, by performing weighting based on the priorities determined based on the road surface information and outputting the first cancellation sound and the second cancellation sound, it is possible to effectively reduce the noise reaching the passenger compartment according to the state of the road surface.

Effect of the Invention

[0015] According to an embodiment of the present disclosure, it is possible to more effectively reduce noise in which various types of noise are mixed.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments 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 appropriately omitted or simplified 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 camera 14, a microphone 15, a speaker 16, an acceleration sensor 17, and a calculation unit 19.

[0020] The camera 14 photographs the road surface G in the traveling direction of the vehicle 50 and acquires a photographed image of the road surface G. The camera 14 is, for example, a stereo camera that acquires a stereo image including depth direction information as a photographed image, but may also be a photographing device that acquires a two-dimensional image. The camera 14 may include two or more imaging elements in order to acquire a stereo image. In the example of FIG. 1, the camera 14 is provided in front of the vehicle 50 so as to be able to photograph the road surface G in front of the vehicle 50, but may also be provided behind the vehicle 50.

[0021] The microphone 15 detects voice information of noise in the passenger compartment of the vehicle 50. The microphone 15 may be provided, for example, near the seat of the vehicle 50. The information processing device 10 may invert the phase of the voice information of the noise detected by the microphone 15 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 voice information in the passenger compartment acquired by the microphone 15 for evaluating the effect of noise cancellation.

[0022] The speaker 16 outputs the cancellation sound as sound waves. The speaker 16 may be realized by the voice output device of the audio system originally provided in the vehicle 50. The speaker 16 can be installed at any location inside the vehicle. For example, the speaker 16 may be provided on the floor surface or near the floor surface inside the vehicle.

[0023] 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.

[0024] The arithmetic unit 19 is connected to the camera 14, 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.

[0025] 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.

[0026] The tire 51 is provided with a communication device 53. The tire 52 is provided with a communication device 54.

[0027] The communication devices 53 and 54 perform wireless communication. The communication devices 53 and 54 are, for example, RF (Radio Frequency) tags. RF tags are also called RFID (Radio Frequency Identification) tags. The communication devices 53 and 54 include an IC (Integrated Circuit) chip constituting 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 and 52, such as the identification information of the tires 51 and 52, the manufacturing date, the circumferential length, and the number of pitches per revolution. The number of pitches is the number of grooves in the width direction formed on the surfaces of the tires 51 and 52. For example, the communication devices 53 and 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 an elongated shape.

[0028] The IC chip may operate by the dielectric electromotive force generated by the electromagnetic wave 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 communicating by generating an electromagnetic wave with their own power. That is, the communication devices 53 and 54 may be active communication devices.

[0029] In the configuration as described above, the information processing device 10 acquires road surface information indicating the situation of the road surface G on which the vehicle 50 travels. Based on the acquired road surface information, the information processing device 10 determines the priorities of a first cancellation sound for canceling a first type of noise generated as the vehicle 50 travels and a second cancellation sound for canceling a second type of noise. The information processing device 10 performs weighting based on the determined priorities and causes the first cancellation sound and the second cancellation sound to be output from the speaker 16. In this way, since the information processing device 10 performs weighting based on the priorities determined based on the road surface information and outputs the first cancellation sound and the second cancellation sound, it is possible to effectively reduce the noise reaching the passenger compartment according to the situation of the road surface G.

[0030] 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 camera 14, a microphone 15, a speaker 16, an acceleration sensor 17, and a calculation unit 19. The calculation unit 19 includes a control unit 11, a storage unit 12, and a communication unit 13. The calculation unit 19 is one or a plurality of computer devices capable of communicating with each other. The calculation 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 may be other dedicated electronic devices.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The functions of the information processing apparatus 10 can be realized by executing a computer program (program) according to this embodiment by 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 this 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".

[0035] 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.

[0036] 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.

[0037] In step S1, the control unit 11 acquires road surface information. The road surface information is any information indicating the situation of the road surface G on which the vehicle 50 travels, which can affect the noise reaching the passenger compartment. For example, the road surface information is, but not limited to, a captured image of the road surface G in the traveling direction of the vehicle 50 acquired by the camera 14, voice information detected by the microphone 15, and combinations thereof. For example, the road surface information may be information regarding the road surface G acquired by any sensor such as a radar and a LiDAR (Light Detection And Ranging). Alternatively, an external device such as a cloud or the storage unit 12 of the information processing apparatus 10 may store in advance road surface information indicating the situation of the road surface G in association with map information indicating a geographical position. The control unit 11 may use the position information of the vehicle 50 measured by a device such as a GPS (Global Positioning System) receiver as a query to acquire the road surface information corresponding to the position information from an external device or the storage unit 12 or the like.

[0038] In step S2, the control unit 11 determines the priorities of the first cancellation sound and the second cancellation sound generated as the vehicle 50 travels based on the road surface information acquired in step S1. The first cancellation sound is a cancellation sound for canceling the first type of noise. The second cancellation sound is a cancellation sound for canceling the second type of noise.

[0039] Specifically, the control unit 11 may determine whether the road surface G is a good road or a bad road based on the road surface information, and determine the priority according to the result. A good road is, for example, a road with a smooth surface and asphalt pavement. A bad road is, for example, an unpaved road with severe surface unevenness. For example, the control unit 11 may calculate the degree of roughness of the road surface G based on the road surface information acquired in step S1. The control unit 11 may determine that it is a good road when the degree of roughness is greater than a predetermined threshold value, and determine that it is a bad road otherwise.

[0040] FIG. 4 is a diagram showing an example of the priority of the cancellation sound according to the state of the road surface G. For example, when the road surface G on which the vehicle 50 travels is a good road, in the noise reaching the passenger compartment, the ratio of the pattern noise generated due to the contact of the tread patterns of the tires 51 and 52 of the vehicle 50 with the road surface G becomes relatively high. Therefore, when the road surface G is a good road, the control unit 11 increases the priority of the cancellation sound for canceling the pattern noise (priority of pattern noise "large", priority of road noise "small"). On the other hand, when the road surface G is a bad road, in the noise reaching the passenger compartment, the ratio of the road noise generated due to the unevenness on the road surface G becomes relatively high. Therefore, when the road surface G is a bad road, the control unit 11 increases the priority of the cancellation sound for canceling the road noise (priority of road noise "large", priority of pattern noise "small").

[0041] FIG. 4 shows an example in which there are two levels, "large" and "small", as priorities for ease of understanding, but the present invention is not limited thereto. For example, the priority of each cancellation sound may have three or more levels such as "large", "medium", and "small", or may be represented by any real number value according to the degree of roughness of the road surface G. The control unit 11 may determine the priority of the cancellation sound for canceling other types of noises such as column resonance sound and cavity resonance sound, in addition to the road noise and the pattern noise, based on the road surface information. Here, the column resonance sound is a noise 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 cavity resonance sound is a noise generated when the tread portions of the tires 51 and 52 vibrate in contact with the unevenness of the road surface G during the running of the vehicle 50, and the gas filled in the inner cavities of the tires 51 and 52 resonates in a cavity. Hereinafter, an example in which the control unit 11 outputs voices for canceling the pattern noise and the road noise as the first cancellation sound and the second cancellation sound from the speaker 16 will be mainly described.

[0042] In step S3, the control unit 11 performs weighting based on the priority determined in step S2, and outputs the first cancellation sound and the second cancellation sound to the speaker 16. Specifically, the control unit 11 generates a cancellation sound for each type of noise to be canceled.

[0043] Pattern noise is radiated when the discontinuous parts of the tread patterns of tires 51 and 52 collide with the road surface G when they come into contact with the road surface, causing the tires 51 and 52 to vibrate due to the impact force. Therefore, the control unit 11 may generate a cancellation sound for canceling the pattern noise based on, for example, the characteristic information of the tires 51 and 52 and the speed of the vehicle 50. The characteristic information of the tires 51 and 52 may include, for example, the circumference of the tires 51 and 52 and the number of pitches (grooves of the tread pattern) per revolution of the tires 51 and 52. The control unit 11 may acquire the characteristic information of the tires 51 and 52 by communicating with the communication devices 53 and 54 embedded in the tires 51 and 52 or other devices. Alternatively, the control unit 11 may predict the frequency band of the pattern noise based on the characteristic information of the tires 51 and 52 and the speed of the vehicle 50, etc., and extract the pattern noise from the audio information detected by the microphone 15 based on the predicted frequency band, etc. The control unit 11 may generate the cancellation sound of the pattern noise by inverting the phase of the extracted pattern noise. Note that the speed of the vehicle 50 can be acquired by any method. For example, the control unit 11 may calculate the speed of the vehicle 50 based on the acceleration of the vehicle 50 detected by the acceleration sensor 17.

[0044] Also, road noise is generated when the elastic movement of the tire excited by the unevenness of the road surface G is transmitted through the suspension, causing the ceiling and floor of the vehicle body to vibrate and become interior noise. Therefore, the control unit 11 may generate a cancellation sound for canceling the road noise based on, for example, the audio information detected by the microphone 15 and the acceleration of the vehicle 50 detected by the acceleration sensor 17. Specifically, the control unit 11 may predict the frequency band of the road noise based on the acceleration of the vehicle 50 detected by the acceleration sensor 17, and extract the road noise from the audio information detected by the microphone 15 based on the predicted frequency band, etc. The control unit 11 may generate the cancellation sound of the road noise by inverting the phase of the extracted road noise.

[0045] Also, 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 predicts the frequency band of the column resonance sound based on, for example, the area of the tire 51 in contact with the road surface G and the shape of the tread pattern of the tire 51, and extracts the column resonance sound from the audio information detected by the microphone 15 based on the predicted frequency band and the like. The control unit 11 may generate a cancellation sound of the column resonance sound by inverting the phase of the extracted column resonance sound.

[0046] Also, for example, the control unit 11 estimates the cavity resonance sound based on the outer diameter and rim diameter of the tires 51 and 52, and the speed of the vehicle 50, etc., and generates a cancellation sound of the cavity resonance sound by inverting the phase of the estimated cavity resonance sound.

[0047] The control unit 11 weights each cancellation sound generated in this way with a value corresponding to the priority determined in step S2, and outputs it from the speaker 16. For example, for time t, let the weight of the first cancellation sound P1(t) be w1 and the weight of the second cancellation sound P2(t) be w2. In this case, the control unit 11 outputs P = w1P1(t) + w2P2(t) from the speaker 16. Similarly, when outputting n (>2) types of cancellation sounds P1(t), P2(t), ···, P n (t), for P1(t), P2(t), ···, P n (t), the weights are w1, w2, ···, w n Then, the control unit 11 outputs P = w1P1(t) + w2P2(t) + ··· + w n P n (t) from the speaker 16.

[0048] In this way, the information processing device 10 can effectively reduce the noise reaching the passenger compartment by adjusting the priority of the cancellation sound to be output according to the state of the road surface G such as the degree of unevenness.

[0049] In step S4, the control unit 11 acquires the audio information of the observed sound in the passenger compartment by the microphone 15.

[0050] In step S5, the control unit 11 corrects the first cancellation sound and the second cancellation sound based on the voice information of the observed sound acquired in step S4. Similarly, when outputting three or more types of cancellation sounds, the control unit 11 corrects each cancellation sound.

[0051] In step S6, the control unit 11 causes the speaker 16 to output the first cancellation sound and the second cancellation sound corrected in step S5. Similarly, when outputting three or more types of cancellation sounds, the control unit 11 causes the speaker 16 to output each corrected cancellation sound. After finishing the process of step S6, the control unit 11 ends the process of the flowchart.

[0052] As described above, the information processing apparatus 10 performs weighting based on the priority determined based on the road surface information, and outputs the first cancellation sound and the second cancellation sound. Therefore, according to the information processing apparatus 10, it is possible to effectively reduce the noise that has reached the passenger compartment according to the situation of the road surface G.

[0053] Further, the information processing apparatus 10 may determine whether the road surface G is a good road or a bad road based on the road surface information, and determine the priority. In this way, by determining the priority of the cancellation sound to be used based on the quality of the road surface G, according to the information processing apparatus 10, it is possible to effectively reduce the noise in the passenger compartment according to the situation of the road surface G.

[0054] Further, when the road surface G is determined to be a good road, the information processing apparatus 10 may more preferentially output a cancellation sound for canceling the pattern noise generated due to the tread patterns of the tires 51 and 52 of the vehicle 50 as the first cancellation sound. In this way, when the information processing apparatus 10 travels on a good road with few irregularities, by more preferentially outputting a cancellation sound for canceling the pattern noise whose proportion in the overall noise becomes relatively large, it is possible to effectively reduce the noise in the passenger compartment.

[0055] Also, when the road surface G is determined to be a rough road, the information processing device 10 may more preferentially output a cancellation sound for canceling the road noise caused by the unevenness of the road surface G as the first cancellation sound. In this way, when the information processing device 10 travels on a rough road with unevenness, by more preferentially outputting a cancellation sound for canceling the road noise whose proportion in the overall noise becomes relatively large, it is possible to effectively reduce the noise in the passenger compartment.

[0056] Further, as road surface information, the information processing device 10 may acquire a captured image of the road surface G in the traveling direction of the vehicle 50, analyze this captured image, determine whether the road surface G is a good road or a rough road, and determine the priority. In this case, the information processing device 10 may calculate the time required for the vehicle 50 to reach the position of the road surface G from which the road surface information is acquired based on the shooting direction of the camera 14, the speed and acceleration of the vehicle 50. After the elapse of the calculated time, the information processing device 10 may perform weighting according to the determined priority and start outputting each cancellation sound. In this way, the information processing device 10 may determine whether the road surface G is a good road or a rough road based on the captured image of the road surface G to be traveled in the future, and immediately start outputting the cancellation sound according to the arrival at that point. By performing such processing, the information processing device 10 can quickly follow the change in the situation of the road surface G and reduce the noise. As described above, the information processing device 10 may acquire information measured by an arbitrary sensor such as a radar and a LiDAR, and information associated with the position information, etc. as the road surface information of the road surface G to be traveled in the future, and determine the priority of each cancellation sound. With such a configuration as well, the information processing device 10 can immediately start outputting the cancellation sound according to the arrival at the point where the road surface information is acquired, and can quickly follow the change in the situation of the road surface G and reduce the noise.

[0057] Further, the information processing device 10 may acquire, as road surface information, the voice information detected by the microphone 15, analyze the voice information, determine whether the road surface G is a good road or a bad road, and determine the priority. In other words, the microphone 15 for acquiring the voice information may also be used to generate a cancellation sound for canceling noise. According to such a configuration, it is possible to effectively reduce noise according to changes in the situation of the road surface G without providing a special configuration such as the camera 14, the radar, and sensors such as LiDAR.

[0058] Further, the information processing device 10 may acquire the voice information of the observation sound generated during the running of the vehicle 50 detected by the microphone 15, and correct the first cancellation sound and the second cancellation sound based on the voice information (steps S4 to S6 in FIG. 3). In this way, the information processing device 10 can verify whether the noise cancellation by the first cancellation sound and the second cancellation sound is effectively performed, correct the first cancellation sound and the second cancellation sound, and output them, thereby further effectively reducing the noise.

[0059] 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]

[0060] Towards the realization of a sustainable society, the SDGs have been proposed. One embodiment of the present invention can be a technology that contributes to "No. 9 - Build the foundation of industry and technological innovation" and the like.

Explanation of reference numerals

[0061] 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 Tire 53, 54 Communication device G Road surface

Claims

1. acquire road surface information indicating the condition of the road surface on which the vehicle travels, based on the road surface information, determine the priorities of a first cancellation sound for canceling a first type of noise generated as the vehicle travels and a second cancellation sound for canceling a second type of noise, perform weighting based on the determined priorities and cause the first cancellation sound and the second cancellation sound to be output to a speaker, An information processing apparatus comprising a control unit.

2. The control unit determines whether the road surface is a good road or a bad road based on the road surface information and determines the priority. The information processing apparatus according to claim 1.

3. When the control unit determines that the road surface is a good road, as the first cancellation sound, it preferentially outputs a cancellation sound for canceling the pattern noise caused by the tread pattern of the vehicle's tire. The information processing apparatus according to claim 2.

4. When the control unit determines that the road surface is a bad road, as the first cancellation sound, it preferentially outputs a cancellation sound for canceling the road noise caused by the unevenness of the road surface. The information processing apparatus according to claim 2.

5. The control unit acquires a photographed image of the road surface in the direction in which the vehicle travels as the road surface information, analyzes the photographed image to determine whether the road surface is a good road or a bad road and determines the priority. The information processing apparatus according to claim 2.

6. The control unit acquires voice information detected by a microphone as the road surface information, analyzes the voice information to determine whether the road surface is a good road or a bad road and determines the priority. The information processing apparatus according to claim 2.

7. The control unit acquires voice information of the observed sound generated during the travel of the vehicle detected by a microphone, corrects the first cancellation sound and the second cancellation 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 performs a step of acquiring road surface information indicating the condition of the road surface on which the vehicle travels, performs a step of determining the priorities of a first cancellation sound for canceling a first type of noise generated as the vehicle travels and a second cancellation sound for canceling a second type of noise based on the road surface information, A step of performing weighting based on the determined priority and outputting the first cancellation sound and the second cancellation sound to a speaker; A control method for an information processing apparatus, including this.

9. A program for operating a computer as the information processing apparatus according to any one of Claims 1 to 7.

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