JP2018024339A - Sound environment adjustment device and sound environment adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly determine a state of a sound environment in a cabin and properly control magnitude of sound of a noise generation source.SOLUTION: A sound environment adjustment device 300 comprises: a sound collection device 330 for collecting sound in a cabin and outputs a sound signal; an acquisition unit 322 for acquiring a rotation number of a fan 113 as an operation amount according to an operation of a user to an air conditioner 100 as an on-vehicle noise generation source; a determination unit 323 for determining whether or not an index indicating a state of a sound environment in the cabin exceeds a reference on the basis of the sound signal and the rotation number of the fan 113; and a control unit 320 for, when it is determined that the index indicating the state of the sound environment in the cabin exceeds the reference by the determination unit 323, controlling the rotation number of the fan 113 for reducing magnitude of the sound of the air conditioner 100.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sound environment adjusting device and a sound environment adjusting method.

  2. Description of the Related Art Conventionally, there is known a vehicle air conditioner that sets a target rotational speed of a compressor according to a set temperature and controls the rotational speed so that the current rotational speed reaches the target rotational speed. In such an air conditioner, when the rotation speed of the compressor rapidly increases, the sound generated with the rotation also increases, and the vehicle user may feel uncomfortable. Therefore, in order to reduce the noise in the vehicle interior, a technique has been proposed that includes a noise level detection means for detecting the noise level in the vehicle interior and controls the rotation speed of the compressor in accordance with the detected noise level (for example, Patent Document 1). In Patent Document 1, it is disclosed that the change rate of the rotation speed of the compressor is set to a small value as the noise level detected by the noise level detection means becomes smaller.

JP 2000-318435 A

  However, the noise level detection means in Patent Document 1 estimates the noise level from the running speed of the vehicle and the engine speed, and detects the noise level based on the sound actually measured using the microphone. It is not. Therefore, in Patent Document 1, road noise that varies depending on road conditions and the volume of audio equipment or conversation sound in the passenger compartment are not taken into account, so the state of the sound environment in the passenger compartment is accurately determined. I can't say. As a result, in Patent Document 1, for example, it is conceivable that an increase in sound generated with the rotation of the compressor cannot be prevented even though the noise level in the passenger compartment is actually low.

  In addition, there are audio devices, car navigation devices, and the like as noise sources that generate sound in vehicles, and these devices are also controlled in order to prevent user discomfort based on sound. Is desirable.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to accurately determine the state of the sound environment in the passenger compartment and to appropriately control the loudness of the noise generation source. The object is to provide a sound environment adjusting device and a sound environment adjusting method.

  In order to achieve the above object, a sound environment adjustment device according to an aspect of the present invention includes a sound collection device that collects sound in a vehicle interior and outputs a sound signal, and a user operation on an on-vehicle noise generation source. An acquisition unit that acquires an operation amount according to the sound level, a determination unit that determines whether an index indicating a state of a sound environment in the vehicle interior exceeds a reference based on at least the sound signal, and the sound by the determination unit And a control unit that controls the amount of operation so as to reduce the volume of sound of the noise generation source when it is determined that an index indicating an environmental state exceeds a reference.

In one embodiment of the present invention, the noise generation source is a device that is mounted on a vehicle and generates sound in the vehicle, and includes, for example, an air conditioner, a car audio device, a car navigation device, and the like. In one embodiment of the present invention, the amount of operation corresponding to the operation of the noise generation source by the user is an amount of operation related to the operation of the noise generation source. For example, the rotation amount of the air conditioner, the volume of the car audio device, and the car volume The volume of the navigation device is included. In one embodiment of the present invention, the sound environment in the vehicle interior refers to the entire set of sounds existing in the vehicle interior. The sounds present in the passenger compartment include sounds of engines, air conditioners, car audio devices, car navigation devices, and road noise. In one embodiment of the present invention, the index indicating the state of the sound environment in the vehicle interior is an index indicating the state of sound existing in the vehicle interior. For example, the overall sound volume in the vehicle interior, The ratio of the volume of another sound to the volume of a certain sound is included.
According to one aspect of the present invention, the sound collecting device collects sound in the passenger compartment and outputs a sound signal. An acquisition part acquires the operation amount according to a user's operation with respect to the noise generation source mounted on the vehicle. A determination part determines whether the parameter | index which shows the state of the sound environment in a vehicle interior exceeded the reference | standard based on the sound signal output by the sound collection part at least. When it is determined by the determination unit that the index indicating the state of the sound environment in the passenger compartment exceeds the reference, the control unit controls the operation amount so as to reduce the volume of noise from the noise generation source. Therefore, according to the above aspect, the sound collection device collects the actual sound in the vehicle interior, and the index indicating the state of the sound environment in the vehicle interior is based on at least the sound signal based on the collected sound. It is determined whether it has been exceeded. As a result, compared with the case where the state of the sound environment in the vehicle interior is determined based only on the amount of movement, the state of the sound environment in the vehicle interior is determined more accurately, and the loudness of the noise source is reduced. It can be controlled appropriately. When it is determined that the index indicating the state of the sound environment in the passenger compartment exceeds the standard, the amount of movement is controlled so as to reduce the volume of the noise from the noise source. Pleasure can be reduced.

  In the aspect of the invention, the determination unit includes an analysis unit that analyzes the sound signal and generates an index related to the loudness of the vehicle interior, and the index related to the loudness of the vehicle interior is predetermined. When exceeding a value, you may determine with the parameter | index which shows the state of the said sound environment exceeded the reference | standard. According to this aspect, the analysis unit analyzes the sound signal output from the sound collector and generates an index related to the loudness of the vehicle interior. The determination unit determines that the index indicating the state of the sound environment exceeds the reference when the index exceeds a predetermined value, so the control unit determines that the volume of the sound in the passenger compartment exceeds the predetermined level. In addition, the operation amount can be controlled so as to reduce the loudness of the noise source.

  In one aspect of the present invention, the determination unit includes an analysis unit that analyzes the sound signal and generates an index related to the loudness of the vehicle interior. When the ratio of the index related to the loudness of the noise generation source associated with the movement amount acquired by the acquisition unit exceeds a predetermined value, it is determined that the index indicating the state of the sound environment exceeds a reference May be. According to this aspect, the analysis unit analyzes the sound signal output from the sound collector and generates an index related to the loudness of the vehicle interior. Further, an index relating to the volume of noise from the noise source is associated with the amount of movement, and the volume of noise from the noise source associated with the amount of movement is obtained by acquiring the amount of movement by an acquisition unit. Indicators for The determination unit determines that the index indicating the state of the sound environment has exceeded a reference when the ratio of the index related to the loudness of the noise generation source to the loudness related index exceeds a predetermined value. . Therefore, when the sound volume of the noise source exceeds a predetermined ratio with respect to the volume of the sound in the passenger compartment, the operation amount is set so as to reduce the sound volume of the noise source. Be controlled. As a result, user discomfort based on sound can be reduced.

  In one aspect of the present invention, the determination unit determines the state of the sound environment when an index related to the loudness of the noise generation source associated with the operation amount acquired by the acquisition unit exceeds a predetermined value. You may determine with the parameter | index which shows exceeding the reference | standard. According to this aspect, the motion amount is associated with an index related to the loudness of the noise generation source, and by acquiring the motion amount by the acquisition unit, the noise generation source associated with the motion amount is acquired. An index for loudness is obtained. Since the determination unit determines that the index indicating the state of the sound environment exceeds the reference when the index exceeds a predetermined value, the control unit determines that the sound level of the noise source exceeds the predetermined level. In this case, the operation amount can be controlled so as to reduce the loudness of the noise source.

  In the aspect of the present invention, the determination unit includes an analysis unit that analyzes the sound signal and generates an index related to a loudness of the vehicle interior, and the predetermined value is a value of the sound of the vehicle interior. The value may be a value obtained by subtracting an index related to the loudness of the noise generation source associated with the motion amount acquired by the acquiring unit from an index related to the magnitude. According to this aspect, the value obtained by subtracting the index related to the loudness of the noise generating source from the index related to the loudness of the vehicle interior is an index related to the loudness of the sound other than the noise generating source. In this aspect, the determination unit indicates the state of the sound environment when the index related to the loudness of the noise source associated with the operation amount exceeds the index related to the loudness other than the noise generating source. It is determined that the indicator exceeds the standard. Therefore, since the operation amount is controlled so as to reduce the sound volume of the noise source according to the sound volume other than the noise source, the noise source of the noise source is adjusted according to the sound around the noise source. The volume of sound can be reduced.

  In the aspect of the invention, the index may be determined based on a loudness curve. According to this aspect, since the index is determined on the basis of the loudness curve, the sound volume of the noise generation source adapted to the user's sense is controlled.

  In the aspect of the invention, the noise generation source may be an in-vehicle air conditioner, and the operation amount may be the number of rotations of the in-vehicle air conditioner. According to this aspect, when it is determined that the index indicating the state of the sound environment in the passenger compartment exceeds the standard, the rotation of the on-vehicle air conditioner is reduced so as to reduce the volume of the on-vehicle air conditioner as a noise generation source. Control the number. Therefore, the user's discomfort based on the sound of the vehicle-mounted air conditioner can be reduced.

    The aspect of the present invention may further include an input device that can be operated by the user, and the determination unit may change the predetermined value based on the operation on the input device. According to this aspect, the predetermined value described above is changed by the user operating the input device. Therefore, the reference value for determining whether or not the indicator indicating the state of the sound environment in the passenger compartment exceeds the reference can be changed according to the operation of the user, so that the sound environment that each user feels The noise generation source can be appropriately controlled in accordance with the state.

  In order to achieve the above object, a method for controlling a noise generation source according to an aspect of the present invention collects sound in a vehicle interior, outputs a sound signal, and responds to a user operation on the on-vehicle noise generation source. And determining whether or not an indicator indicating the state of the sound environment in the vehicle interior exceeds a reference based on at least the sound signal, and determining that the indicator indicating the state of the sound environment exceeds a reference If so, the operation amount is controlled so as to reduce the loudness of the noise generating source.

  According to one aspect of the present invention, sound in the passenger compartment is collected and output as a sound signal. In addition, an operation amount corresponding to the user's operation on the on-vehicle noise generation source is acquired. Then, based on the output sound signal and the acquired operation amount, it is determined whether or not the index indicating the state of the sound environment in the vehicle compartment exceeds the reference. When it is determined that the index indicating the state of the sound environment in the passenger compartment exceeds the reference, the operation amount is controlled so as to reduce the loudness of the noise generation source. Therefore, according to the above aspect, whether or not the indicator indicating the state of the sound environment in the vehicle interior exceeds the reference based on the sound signal based on the collected sound at least after collecting the actual sound in the vehicle interior Is determined. As a result, compared with the case where the state of the sound environment in the vehicle interior is determined based only on the amount of movement, the state of the sound environment in the vehicle interior is determined more accurately, and the loudness of the noise source is reduced. It can be controlled appropriately. When it is determined that the index indicating the state of the sound environment in the passenger compartment exceeds the standard, the amount of movement is controlled so as to reduce the volume of the noise from the noise source. Pleasure can be reduced.

It is a block diagram which shows the function of the sound environment adjustment system in 1st Embodiment of this invention. It is a figure which shows an example of a conversion table. It is a figure which shows an example of a control table. It is a figure which shows the relationship between the sound pressure level which shows the loudness of a vehicle interior, the noise level other than an air-conditioner, and the noise level of a fan. It is a flowchart which shows operation | movement of a sound environment adjustment system. It is a flowchart which shows the process of the control part and determination part for responding to operation of an input device by a user. It is a figure which shows an example of the control table in 2nd Embodiment of this invention. It is a figure which shows a loudness curve.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>

  FIG. 1 is a configuration diagram of a sound environment adjustment system 1 according to the first embodiment of the present invention. The sound environment adjustment system 1 according to the first embodiment, as illustrated in FIG. 1, adjusts the sound environment that controls the rotational speed of the air conditioner 100 as a noise generation source, other devices 200 such as audio devices, and the air conditioner 100. Device 300. The air conditioner 100, the other devices 200, and the sound environment adjusting device 300 are all installed in a vehicle such as a passenger car. In the present invention, the noise generation source is a device that is mounted on the vehicle and generates sound in the vehicle, and includes, for example, an air conditioner, a car audio device, a car navigation device, and the like. In this embodiment, an air conditioner will be described as an example of a noise generation source.

  As illustrated in FIG. 1, the air conditioner 100 according to the first embodiment includes a temperature setting unit 110, a temperature monitoring unit 111, a fan control unit 112, a fan 113, and a storage device 114. The temperature setting unit 110 is an operating device that receives a temperature setting instruction for the air conditioner by a vehicle user. For example, by appropriately operating the temperature setting unit 110, the user can instruct at any time the temperature in the passenger compartment adjusted by the air conditioner 100. A temperature setting instruction by a user operation is output from the temperature setting unit 110 to the fan control unit 112 as a temperature setting signal TS. The temperature monitoring unit 111 is a device that monitors the temperature in the passenger compartment, and includes, for example, a temperature sensor. The temperature in the vehicle compartment monitored by the temperature monitoring unit 111 is output from the temperature monitoring unit 111 to the fan control unit 112 as a vehicle interior temperature signal TD.

The fan control unit 112 is a processing circuit including, for example, a CPU (Central Processing Unit), and controls the rotation speed of the fan 113 of the air conditioner 100. The storage device 114 is configured by a known recording medium such as a magnetic recording medium or a semiconductor recording medium, or a combination of a plurality of types of recording media, and a program executed by the fan control unit 112 and various types used by the fan control unit 112 Memorize data. The fan control unit 112 compares the temperature corresponding to the temperature setting signal TS output from the temperature setting unit 110 with the temperature corresponding to the vehicle interior temperature signal TD output from the temperature monitoring unit 111, and rotates the fan 113. A control signal RS for controlling the number is output to the fan 113.
In the present embodiment, the temperature setting instruction operation for the air conditioner 100 is an example of a user operation on the air conditioner 100 as a noise generation source. In the present embodiment, the rotation speed of the air conditioner 100 is an example of an operation amount corresponding to a user operation on the air conditioner 100 as a noise generation source.

For example, if the vehicle interior temperature indicated by the vehicle interior temperature signal TD is higher than the set temperature indicated by the temperature setting signal TS, the fan control unit 112 causes the fan 113 to reduce the vehicle interior temperature to the set temperature. A control signal RS for increasing the number of revolutions is output to the fan 113. Further, the fan control unit 112 controls the fan 113 so as to increase the vehicle interior temperature to the set temperature when the vehicle interior temperature indicated by the vehicle interior temperature signal TD is lower than the set temperature indicated by the temperature setting signal TS. A control signal RS for decreasing the rotational speed is output to the fan 113.
In addition, when the control signal RC is input from the sound environment adjustment device 300, the fan control unit 112 outputs the control signal RS to the fan 113 so that the rotational speed of the fan 113 does not exceed the upper limit value of the rotational speed included in the control signal RC. It outputs to 113. Furthermore, the fan control unit 112 outputs a rotation speed signal RD indicating the current rotation speed of the fan 113 to the sound environment adjustment apparatus 300 in response to a request from the sound environment adjustment apparatus 300.

  The fan 113 is provided in an air conditioner unit (not shown). The fan 113 is rotationally driven by a motor and sends air cooled by the air conditioner unit into the vehicle interior. The rotational speed of the fan 113 is also controlled by a control signal RS output from the fan control unit 112. For example, by increasing the rotation speed of the fan 113, the amount of cooled air sent into the vehicle interior increases, and the temperature in the vehicle interior decreases. Further, by reducing the rotation speed of the fan 113, the amount of cooled air sent into the vehicle interior decreases, and the temperature in the vehicle interior increases.

As illustrated in FIG. 1, the sound environment adjustment device 300 according to the first embodiment includes an input device 310, a control device 320, a sound collection device 330, and a storage device 340.
The input device 310 is an operation device operated by a user for various instructions to the sound environment adjustment device 300. For example, a plurality of operators operated by the user and a touch panel that detects contact by the user are preferably used as the input device 310. The input device 310 outputs an input signal X to the control device 320 every time an operation or contact by a user is detected. In the present embodiment, as an example, when the user feels that the sound in the vehicle interior is loud, the sound environment adjusting device 300 gives an instruction to lower the sound in the vehicle interior by operating the input device 310 by the user. It is possible to do it. When the input signal X is output from the input device 310 according to the user's operation, the control device 320 performs control so as to reduce the rotation speed of the fan 113. For example, in this embodiment, every time the input signal X is output, the number of rotations per minute of the fan 113 is decreased by ten. Then, the sound pressure level of the sound in the passenger compartment when the operation of the input device 310 is not performed becomes a criterion for determination by the determination unit 323 described later. The control device 320 controls the rotation speed of the fan 113 so as not to exceed the reference after the time point when the operation of the input device 310 is not performed. The control device 320 controls the rotation speed of the fan 113 independently of the operation by the user of the input device 310. When the operation of the user of the input device 310 is performed, the control device 320 controls the fan 113 according to the operation. Control the number of revolutions.

  The sound collection device 330 (microphone) is an acoustic device that collects sound in the passenger compartment and generates a sound signal Y. Specifically, the sound collection device 330 collects sound that can be heard in the vehicle interior such as the sound of the fan 113 of the air conditioner 100, the sound of the other devices 200, and road noise, A sound signal Y representing the magnitude is generated. The A / D converter that converts the sound signal Y generated by the sound collector 330 from analog to digital is not shown for convenience.

  The control device 320 is a processing circuit including, for example, a CPU (Central Processing Unit). In the present embodiment, as an example, according to the sound in the passenger compartment and according to the operation by the user of the input device 310, the fan of the air conditioner 100 is used. The number of rotations 113 is controlled. The storage device 340 is configured by a known recording medium such as a magnetic recording medium or a semiconductor recording medium, or a combination of a plurality of types of recording media, and a program executed by the control device 320 and various data used by the control device 320. Remember. The storage device 340 of the first embodiment stores a conversion table T1 and a control table T2.

  FIG. 2 is a diagram illustrating an example of the conversion table T1 in the present embodiment. As illustrated in FIG. 2, the conversion table T <b> 1 is a table showing the relationship between the rotational speed of the fan 113 and the noise level of the fan 113. “Off”, “60”, “70”, “80”, and “100” are stored in the “fan rotation speed” fields of the records R1, R2, R3, R4, and R5 in the conversion table T1, respectively. . “60”, “70”, “80”, and “100” are data indicating the number of rotations per minute of the fan 113. “Off” is data indicating a case where the fan 113 is stopped. In the “fan noise level” field of the records R1, R2, R3, R4, and R5 in the conversion table T1, the fan 113 is driven at the rotational speed stored in the “fan rotational speed” field. The value of the noise level (dB) in the passenger compartment is stored. When the fan 113 is stopped, the noise level is 0 (dB). When the rotation speed of the fan 113 is “60”, “70”, “80”, “100”, the noise level ( dB) are “35”, “55”, “60”, and “65”, respectively. Each value stored in the conversion table T1 is measured in advance with the air conditioner 100 installed in the vehicle.

  FIG. 3 is a diagram illustrating an example of the control table T2 in the present embodiment. As illustrated in FIG. 3, the control table T <b> 2 is a table showing the relationship between the noise level other than the air conditioner 100 and the rotation speed of the fan 113 to be controlled. In the “noise level other than air conditioner” field of the records R10, R11, R12, R13, and R14 in the control table T2, the upper limit value of the noise level excluding the noise level of the fan 113 from the overall noise level in the passenger compartment is set. Stored. In FIG. 3, “˜50” indicates that the upper limit value of the noise level other than the air conditioner is 50 (dB). In FIG. 3, “˜55” indicates that the noise level other than the air conditioner exceeds 50 (dB) and is 55 (dB) or less, and “˜60” indicates that the noise level other than the air conditioner exceeds 55 (dB) and 60 ( dB) It is shown below. Further, “˜65” indicates that the noise level other than the air conditioner exceeds 60 (dB) and is 65 (dB) or less.

  The upper limit value of the rotational speed when the fan 113 is controlled is stored in the “fan rotational speed to be controlled” field of the records R10, R11, R12, R13, and R14 in the control table T2. In FIG. 3, “no control” indicates that the control device 320 does not control the air conditioner 100. In this case, the fan 113 is controlled in the air conditioner 100 based on the temperature setting in the air conditioner 100 regardless of the noise level. In FIG. 3, “<100” indicates that the upper limit value of the number of rotations per minute of the fan 113 is 100. When the air conditioner 100 is instructed by the control device 320 as an upper limit value of the fan 113, the upper limit value of the fan 113 does not exceed 100 while controlling the rotation speed of the fan 113 based on the temperature setting. To control. Similarly, in FIG. 3, “<80”, “<70”, and “<60” indicate that the upper limit of the number of rotations per minute of the fan 113 is 80, 70, and 60, respectively. .

  As illustrated in FIG. 1, the control device 320 functions as the control unit 321, the acquisition unit 322, the determination unit 323, and the analysis unit 324 by executing the program stored in the storage device 340. . A configuration in which the functions of the control device 320 exemplified above are distributed to a plurality of devices, or a configuration in which a dedicated electronic circuit realizes a part of the functions of the control device 320 may be employed.

  The acquisition unit 322 acquires a rotation speed signal RD indicating the upper limit of the rotation speed of the fan 113 of the air conditioner 100 according to the temperature setting operation by the user from the fan control unit 112 of the air conditioner 100. That is, the acquisition unit 322 acquires the rotation speed of the fan 113 indicated by the rotation speed signal RD as an operation amount corresponding to a user operation on the air conditioner 100 as a noise generation source. The acquisition unit 322 outputs the acquired rotation speed signal RD to the determination unit 323.

  The determination unit 323 also has a function as the analysis unit 324. The analysis unit 324 analyzes the sound signal Y output from the sound collector 330 and generates an index related to the loudness of the vehicle interior. In the present embodiment, the analysis unit 324 analyzes the frequency band and sound pressure level of the sound signal Y, cancels the voice of the user, and then uses the vehicle interior as an example of an index related to the loudness of the vehicle interior. A sound pressure level (dB) indicating the loudness is generated.

The determination unit 323 determines whether or not a sound pressure level (dB) indicating the loudness of the vehicle interior generated from the sound signal Y exceeds a reference. In the present embodiment, the sound pressure level (dB) indicating the loudness of the vehicle interior generated from the sound signal Y is an example of an index indicating the state of the sound environment in the vehicle interior. That is, the determination unit 323 determines, based on at least the sound signal Y, whether or not the index indicating the state of the sound environment in the vehicle compartment exceeds a reference. In the present invention, the sound environment in the passenger compartment refers to the entire set of sounds existing in the passenger compartment. The sounds present in the passenger compartment include sounds of engines, air conditioners, car audio devices, car navigation devices, and road noise.
As for the reference, a predetermined sound pressure level (dB) may be used as a reference. Alternatively, the initial value of the sound pressure level (dB) indicating the loudness of the vehicle interior when the determination unit 323 starts processing immediately after the vehicle is turned on may be used as a reference. In this embodiment, as an example, a plurality of standards such as weak effect, medium effect, and strong effect are set in advance so that the user can select which standard to use on the user interface (not shown). The case where it was made will be described. However, when the rotational speed of the fan 113 is reduced based on the operation of the input device 310 by the user, and as a result, the sound pressure level (dB) indicating the loudness of the vehicle interior is lower than the reference. Uses the sound pressure level (dB) indicating the loudness of the lowered vehicle interior as the reference.

  The control unit 321 controls the upper limit of the rotation speed of the fan 113 so that the sound level of the air conditioner 100 is reduced when the determination unit 323 determines that the sound pressure level of the sound in the passenger compartment exceeds the reference. The signal RC is output to the fan 113. As described above, in the present embodiment, the sound pressure level of the sound in the passenger compartment is an example of an index indicating the state of the sound environment in the passenger compartment. Further, in the present embodiment, the rotation speed of the fan 113 is an example of an operation amount corresponding to a user operation on the air conditioner 100. That is, in the present embodiment, the control unit 321 reduces the loudness of the air conditioner 100 when the determination unit 323 determines that the index indicating the state of the sound environment in the passenger compartment exceeds the reference. The number of rotations of the fan 113 as the operation amount is controlled. Further, every time an input signal X is output from the input device 310, the control unit 321 outputs a control signal RC for decreasing the number of rotations of the fan 113 by 10 to the fan control unit 112 of the air conditioner 100. .

  FIG. 4 is a diagram showing the relationship between the sound pressure level (dB) indicating the loudness of the vehicle interior, the noise level (dB) other than the air conditioner, and the noise level of the fan 113. As shown in FIG. 4, the sound pressure level (dB) indicating the loudness of the vehicle interior is a value obtained by adding the noise level (dB) other than the air conditioner and the noise level (dB) of the fan 113. . In the present embodiment, the determination unit 323 is a criterion selected by a user through a user interface (not shown) from a plurality of predetermined criteria (for example, low effect, high effect, high effect, etc.), or a user The sound pressure level (dB) indicating the loudness of the vehicle interior that is lower than the selected reference based on the operation of the input device 310 is set as the reference. And the control part 321 respond | corresponds to the user's operation with respect to the air conditioner 100 as a noise generation source so that the sound pressure level (dB) which shows the magnitude | size of the sound of the said vehicle interior produced | generated at any time may not exceed the said reference | standard. The number of rotations of the fan 113 as the amount of operation is controlled. In the present embodiment, when the noise level (dB) other than the air conditioner increases, the noise level (dB) indicating the loudness of the vehicle interior is reduced by reducing the noise level (dB) of the fan 113. Does not exceed the above standard. In order to reduce the noise level (dB) of the fan 113, it is necessary to reduce the rotation speed of the fan 113, but in this embodiment, the upper limit of the rotation speed of the fan 113 according to the noise level (dB) other than the air conditioner. Values are stored in the control table T2. Therefore, in the present embodiment, the noise level (dB) other than the air conditioner is calculated as needed by the determination unit 323, and the control unit 321 refers to the control table T2, so that the fan according to the noise level (dB) other than the air conditioner. The number of rotations 113 is controlled to the upper limit value or less. However, when the noise level (dB) other than the air conditioner is equal to or lower than a predetermined value, the sound pressure level (dB) indicating the loudness of the vehicle interior as a whole is the reference even when the rotation speed of the fan 113 is maximum. May not be exceeded. Therefore, in this case, the rotation speed of the fan 113 is not controlled.

  Calculation of the noise level other than for air conditioners is performed as follows. First, the determination unit 323 reads the noise level (dB) of the fan 113 corresponding to the rotation speed indicated by the rotation speed signal RD with reference to the conversion table T1. Next, the determination unit 323 subtracts the noise level (dB) of the fan 113 from the sound pressure level (dB) indicating the loudness of the vehicle interior generated based on the sound signal Y. The noise level (dB) is calculated. And the determination part 323 controls the determination result whether the sound pressure level (dB) which shows the loudness of the said vehicle interior exceeds the said reference | standard, and the calculated noise level (dB) other than an air-conditioner. To the unit 321. When the determination unit 323 determines that the sound pressure level (dB) indicating the loudness of the vehicle interior exceeds the reference, the control unit 321 refers to the control table T2 and other than the air conditioner. The upper limit value of the rotational speed of the fan 113 corresponding to the noise level (dB) is read. Then, the control unit 321 outputs a control signal RC including the upper limit value of the rotational speed to the air conditioner 100.

  The other devices 200 include various in-vehicle devices that generate sound, such as an audio device or a car navigation system device that outputs sound.

Next, the operation of the sound environment adjustment system 1 in the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing the operation of the sound environment adjustment system 1. The operation of the sound environment adjustment system 1 shown in FIG. 5 is executed at predetermined time intervals when the engine is started in the vehicle and the operation of the air conditioner 100 is started.
As shown in FIG. 5, when the user operates the temperature setting unit 110 of the air conditioner 100 to set a desired temperature, the temperature setting unit 110 outputs a temperature setting signal TS indicating the set temperature to the fan control unit 112. (S10).

  The fan control unit 112 sets the vehicle interior temperature to the set temperature based on the vehicle interior temperature signal TD output from the temperature monitoring unit 111 that measures the room temperature and the temperature setting signal TS output from the temperature setting unit 110. As described above, the fan 113 is rotated at a predetermined rotational speed to adjust the temperature (S20). The sound environment adjusting device 300 collects the sound in the passenger compartment by the sound collecting device 330 to generate the sound signal Y (S30), and the sound signal Y is analyzed by the analyzing unit 324 (S40). In this embodiment, as an example, the user's voice is canceled from the sound signal Y, and a sound pressure level (dB) indicating the loudness of the vehicle interior is generated.

  In addition, the sound environment adjustment apparatus 300 acquires the rotation speed signal RD indicating the current rotation speed of the fan 113 by the acquisition unit 322 (S50). The acquisition unit 322 outputs the acquired rotation speed signal RD to the determination unit 323. The determination unit 323 sets, as the reference, a reference selected by a user through a user interface (not shown) from a plurality of preset references. The determination unit 323 determines whether or not the sound pressure level (dB) indicating the loudness of the vehicle interior exceeds the reference (S60). If the determination unit 323 determines that the sound pressure level (dB) indicating the loudness of the vehicle interior does not exceed the reference (S60: NO), the process returns to step S20.

  However, when the rotation speed of the fan 113 increases as a result of the temperature adjustment, the noise level of the fan 113 increases, and the sound pressure level (dB) indicating the loudness of the passenger compartment increases. For example, when road noise increases, the sound pressure level (dB) indicating the loudness of the vehicle interior increases. When the determination unit 323 determines that the sound pressure level (dB) indicating the loudness of the vehicle interior exceeds the reference (S60: YES), the control unit 321 cooperates with the determination unit 323, An upper limit value of the rotational speed of the fan 113 that satisfies the above criteria is determined (S70). Specifically, the determination unit 323 reads the noise level (dB) of the fan 113 corresponding to the rotation speed indicated by the rotation speed signal RD with reference to the conversion table T1. Next, the determination unit 323 subtracts the noise level (dB) of the fan 113 from the sound pressure level (dB) indicating the loudness of the vehicle interior generated by the analysis unit 324, thereby obtaining a noise level other than that of the air conditioner. (DB) is calculated. Then, the determination unit 323 outputs the noise level (dB) other than the air conditioner to the control unit 321 together with the determination result that the sound pressure level (dB) indicating the loudness of the passenger compartment exceeds the reference. The control unit 321 reads the upper limit value of the rotational speed of the fan 113 corresponding to the noise level (dB) other than the air conditioner by referring to the control table T2. And the control part 321 outputs the control signal RC containing the upper limit of rotation speed to the air conditioner 100 (S80). As described above, in the present embodiment, the rotational speed of the fan 113 is decreased to reduce the noise level (dB) of the fan 113 so that the sound pressure level (dB) indicating the loudness of the vehicle interior does not exceed the reference. ).

FIG. 6 is a flowchart showing the processing of the control unit 321 and the determination unit 323 to cope with the operation of the input device 310 by the user. The process shown in FIG. 6 is executed at predetermined time intervals when the engine is started in the vehicle and the operation of the air conditioner 100 is started. Moreover, the process shown in FIG. 6 shall be performed independently of the process shown in FIG.
As shown in FIG. 6, the control unit 321 determines whether or not the input signal X is output from the input device 310 (S100). When it is determined that the input signal X is not output from the input device 310 (S100: NO), the control unit 321 ends the process. However, if the control unit 321 determines that the input signal X has been output from the input device 310 (S100: YES), the control unit 321 outputs to the air conditioner 100 a control signal RC that decreases the rotational speed of the fan 113 by 10 per minute. (S110). The analysis unit 324 collects sound by the sound collecting device 330 after a lapse of a period from when the control signal RC is output to the air conditioner 100 until the fan 113 actually rotates at the rotational speed based on the control signal RC. A sound in the passenger compartment is input as a sound signal Y (S120). The analysis unit 324 analyzes the input sound signal Y (S130). In the present embodiment, as an example, the voice of the user is canceled and a sound pressure level (dB) indicating the loudness of the vehicle interior is generated. The determination unit 323 sets the generated sound pressure level (dB) indicating the loudness of the vehicle interior as the reference (S140). Each time the input signal X is output, the number of revolutions of the fan 113 is reduced by ten, so that the noise level of the fan 113 is also reduced as the number of revolutions is reduced. Therefore, since the sound pressure level (dB) indicating the loudness of the vehicle interior is also lowered, the sound pressure level (dB) set as the reference every time the user operates the input device 310 is Lower.

  Next, the results of processing in the present embodiment will be described using specific numerical values. For example, it is assumed that the sound pressure level (dB) indicating the loudness of the vehicle interior generated by the analysis unit 324 is 120 (dB). Further, it is assumed that the number of rotations of the fan 113 at that time acquired by the acquisition unit 322 is 80. In this case, the determination unit 323 reads 60 (dB) as the noise level of the fan 113 corresponding to the rotation speed 80 with reference to the conversion table T1. The determination unit 323 subtracts 60 (dB), which is the noise level of the fan 113, from 120 (dB), which is the sound pressure level (dB) indicating the loudness of the vehicle interior, to obtain a noise level (dB) other than that of the air conditioner. Is calculated as 60 (dB). Here, a measure indicating the level of noise level other than that of the air conditioner is calculated based on the sound pressure level indicating the loudness of the vehicle interior and the noise level of the fan 113. “Noise level 60 other than air conditioner 60 (dB)” is calculated by the above method for easy explanation, and does not indicate actual sound pressure. The sound pressure level addition and subtraction shown in the following description has the same concept. When the input device 310 is not operated by the user in this state, 120 (dB), which is a sound pressure level (dB) indicating the loudness of the vehicle interior, is set as the reference.

  Here, it is assumed that the rotation speed of the fan 113 is increased from 80 to 100 as a result of the temperature adjustment. In this case, the noise level (dB) of the fan 113 increases by 5 (dB) from 60 (dB) to 65 (dB). As a result, the sound pressure level (dB) indicating the loudness of the passenger compartment is also increased by 5 (dB) to 125 (dB). Therefore, the determination unit 323 determines that the sound pressure level (dB) indicating the loudness of the vehicle interior has exceeded the reference value of 120 (dB). At this time, the noise level (dB) other than the air conditioner, which is the difference between the sound pressure level (dB) indicating the loudness of the vehicle interior and the noise level (dB) of the fan 113, is 60 (dB) and changes. There shall be no. The control unit 321 reads 80 as the upper limit value of the rotation speed of the fan 113 corresponding to 60 (dB) which is a noise level (dB) other than the air conditioner by referring to the control table T2. Then, the control unit 321 outputs a control signal RC including 80, which is the upper limit value of the rotation speed, to the air conditioner 100. As a result, the number of rotations per minute of the fan 113 decreases from 100 to 80, and the noise level (dB) of the fan 113 decreases from 65 (dB) to 60 (dB). Accordingly, the sound pressure level (dB) indicating the loudness of the passenger compartment is also reduced from 125 (dB) to 120 (dB) as the reference. As described above, according to the present embodiment, the sound pressure level (dB) indicating the loudness of the vehicle interior is the reference even when the rotational speed of the fan 113 increases as a result of the temperature adjustment. Control is performed to reduce the rotational speed of the fan 113 per minute so as not to exceed. As a result, the loudness of the sound in the passenger compartment is kept constant, and for example, it is possible to prevent the user's voice from becoming difficult to hear due to the noise level of the fan 113.

  Next, although the noise level of the fan 113 does not change, it is assumed that some cause, for example, road noise increases and the noise level (dB) other than the air conditioner increases. For example, it is assumed that the sound pressure level (dB) indicating the loudness of the vehicle interior has increased from 120 (dB) to 130 (dB). The determination unit 323 subtracts 60 (dB), which is the noise level of the fan 113, from 130 (dB), which is the sound pressure level (dB) indicating the loudness of the vehicle interior, to obtain a noise level (dB) other than that of the air conditioner. As a result, 70 (dB) is calculated. The determination unit 323 determines that the sound pressure level (dB) 130 (dB) indicating the loudness of the vehicle interior exceeds the reference 120 (dB). The control unit 321 reads 60 as the upper limit value of the rotation speed of the fan 113 corresponding to 70 (dB) which is a noise level (dB) other than the air conditioner by referring to the control table T2. Then, the control unit 321 outputs a control signal RC including 60 which is the upper limit value of the rotational speed to the air conditioner 100. As a result, the number of rotations per minute of the fan 113 decreases from 80 to 60, and the noise level (dB) of the fan 113 decreases by 25 (dB) from 60 (dB) to 35 (dB). Therefore, the sound pressure level (dB) indicating the loudness of the vehicle interior also decreases from 130 (dB) to 115 (dB). As described above, according to the present embodiment, when the noise level (dB) other than the air conditioner increases, the sound pressure level (dB) indicating the loudness of the vehicle interior does not exceed the reference. Then, control is performed to reduce the rotational speed of the fan 113 per minute. As a result, the volume of the sound in the passenger compartment is kept below the reference, and for example, it is possible to prevent the voice of the user from becoming difficult to hear due to the noise level of the fan 113.

  Next, a case where the user operates the input device 310 corresponding to the flow of FIG. 6 will be described. For example, it is assumed that the sound pressure level (dB) indicating the loudness of the vehicle interior is 120 (dB), and the rotation speed of the fan 113 per minute is 80. In this case, the noise level of the fan 113 is 60 (dB). In this state, when the user operates the input device 310 and the input signal X is output to the control device 320, the control unit 321 performs control so that the number of rotations per minute of the fan 113 is reduced from 80 to 70. The signal RC is output to the air conditioner 100. As a result, the noise level of the fan 113 is reduced from 60 (dB) to 55 (dB). With this decrease, the sound pressure level (dB) indicating the loudness of the passenger compartment decreases from 120 (dB) to 115 (dB). The determination unit 323 sets 115 (dB) as the reference. As described above, according to the present embodiment, the reference can be lowered by the user operating the input device 310. Whether or not the state of the sound environment in the passenger compartment is appropriate differs depending on the user's sense, but according to the present embodiment, the standard can be set according to each user, so it is suitable for each user. The sound environment is adjusted.

  As described above, according to the present embodiment, whether or not the index indicating the state of the sound environment in the vehicle interior exceeds the reference based on at least the volume of the vehicle interior sound collected by the sound collection device 330. Therefore, the state of the sound environment in the passenger compartment can be accurately determined. In addition, since the rotation speed of the fan 113 is controlled so that the volume of the sound in the passenger compartment does not exceed the above-mentioned standard, the loudness of the noise source is appropriately controlled according to the state of the sound environment in the passenger compartment. can do.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram illustrating a control table T2 in the second embodiment.
As illustrated in FIG. 7, the control table T <b> 2 is a table showing the relationship between the noise level other than the air conditioner 100 and the rotation speed of the fan 113 to be controlled. In the “noise level other than air conditioner” field of records R20, R21, R22, R23, and R24 in the control table T2, the upper limit value of the noise level excluding the noise level of the fan 113 from the overall noise level in the passenger compartment is set. Stored. The content stored in the “noise level other than air conditioner” field is the same as the control table T2 of the first embodiment shown in FIG.

  The upper limit value of the rotational speed when the fan 113 is controlled is stored in the “fan rotational speed to be controlled” field of the records R20, R21, R22, R23, and R24 in the control table T2. As shown in FIG. 7, the fields “<60”, “<70”, “<80”, “<100”, “<60”, “<70”, “No control” data is stored. As described above, the contents stored in the “controlling fan speed” field of the records R20, R21, R22, R23, and R24 are different from the control table T2 of the first embodiment shown in FIG.

  In the first embodiment, when the noise level other than that of the air conditioner 100 is increased, the noise level of the fan 113 in the air conditioner 100 is decreased so that the loudness of the vehicle interior does not increase. However, in the present embodiment, control is performed so that the noise level of the fan 113 does not exceed the noise level other than that of the air conditioner 100.

  In this embodiment, the ratio of the noise level of the fan to the noise level other than that of the air conditioner is used as an index indicating the state of the sound environment. In the present embodiment, the ratio of 1 is used as the reference. When the ratio of the noise level of the fan to the noise level other than that of the air conditioner is 1 or less, the determination unit 323 does not determine that the index indicating the state of the sound environment exceeds the reference. However, when the ratio of the noise level of the fan to the noise level other than that of the air conditioner exceeds 1, the determination unit 323 determines that the index indicating the state of the sound environment exceeds the reference. In other words, in this embodiment, when the noise level of the fan exceeds the noise level other than that of the air conditioner, the determination unit 323 determines that the index indicating the state of the sound environment exceeds the reference. In other words, in the present embodiment, the determination unit 323 determines that the sound environment when the noise level of the fan 113 associated with the rotational speed of the fan 113 as the operation amount exceeds a noise level other than the air conditioner as a predetermined value. It is determined that the index indicating the state of the condition exceeds the standard.

  The flowchart shown in FIG. 5 can be similarly applied to the present embodiment, but since the reference is different from that of the first embodiment, the content of processing is different from that of the first embodiment. Further, the flowchart shown in FIG. 6 can be similarly applied to the present embodiment, but the processing from step S120 to step S140 shown in FIG. 6 is omitted in the present embodiment.

  The operation of the sound environment adjustment system 1 in this embodiment will be described with reference to the flowchart shown in FIG. The processing from step S20 to step S50 shown in FIG. 5 is the same as that in the first embodiment. In the present embodiment, the determination unit 323 determines whether or not the index indicating the state of the sound environment exceeds the reference, depending on whether the noise level (dB) of the fan exceeds the noise level (dB) other than the air conditioner. Determine (S60). For example, if the rotation speed of the fan 113 increases as a result of temperature adjustment, the noise level (dB) of the fan 113 increases, and it is conceivable that the noise level (dB) other than the air conditioner is exceeded. Further, it is conceivable that the noise level (dB) of the fan 113 exceeds the noise level (dB) other than the air conditioner due to the reduction of road noise. In such a case, the determination unit 323 determines that the ratio of the noise level (dB) of the fan to the noise level (dB) other than the air conditioner, which is an index indicating the state of the sound environment, exceeds the reference ( S60: YES). The control unit 321 determines the upper limit value of the rotational speed of the fan 113 that satisfies the above criteria in cooperation with the determination unit 323 (S70). Specifically, the determination unit 323 reads the noise level (dB) of the fan 113 corresponding to the rotation speed indicated by the rotation speed signal RD with reference to the conversion table T1. Next, the determination unit 323 subtracts the noise level (dB) of the fan 113 from the sound pressure level (dB) indicating the loudness of the vehicle interior generated by the analysis unit 324, thereby obtaining a noise level other than that of the air conditioner. (DB) is calculated. Then, the determination unit 323 outputs the noise level (dB) other than the air conditioner to the control unit 321 together with the determination result that the sound pressure level (dB) indicating the loudness of the passenger compartment exceeds the reference. The control unit 321 reads the upper limit value of the rotational speed of the fan 113 corresponding to the noise level (dB) other than the air conditioner by referring to the control table T2. And the control part 321 outputs the control signal RC containing the upper limit of rotation speed to the air conditioner 100 (S80). As described above, in the present embodiment, the rotational speed of the fan 113 is decreased to reduce the noise level (dB) of the fan 113 so that the sound pressure level (dB) indicating the loudness of the vehicle interior does not exceed the reference. ).

  Next, the results of processing in the present embodiment will be described using specific numerical values. For example, it is assumed that the sound pressure level (dB) indicating the loudness of the current vehicle interior generated by the analysis unit 324 is 120 (dB). Further, it is assumed that the number of rotations of the fan 113 at that time acquired by the acquisition unit 322 is 80. In this case, the determination unit 323 reads 60 (dB) as the noise level of the fan 113 corresponding to the rotation speed 80 with reference to the conversion table T1. The determination unit 323 subtracts 60 (dB), which is the noise level of the fan 113, from 120 (dB), which is the sound pressure level (dB) indicating the loudness of the vehicle interior, to obtain a noise level (dB) other than that of the air conditioner. Is calculated as 60 (dB).

  Here, it is assumed that the rotation speed of the fan 113 is increased from 80 to 100 as a result of the temperature adjustment. In this case, the noise level (dB) of the fan 113 increases by 5 (dB) from 60 (dB) to 65 (dB). As a result, the sound pressure level (dB) indicating the loudness of the passenger compartment is also increased by 5 (dB) to 125 (dB). At this time, the noise level (dB) other than the air conditioner, which is the difference between the sound pressure level (dB) indicating the loudness of the vehicle interior and the noise level (dB) of the fan 113, is 60 (dB) and changes. There shall be no. Therefore, the determination unit 323 determines that 65 (dB), which is the noise level (dB) of the fan 113, exceeds 60 (dB), which is the noise level (dB) other than the air conditioner. That is, the determination unit 323 determines that the ratio of the noise level (dB) of the fan to the noise level (dB) other than the air conditioner, which is an index indicating the state of the sound environment, exceeds the reference.

  The control unit 321 reads 80 as the upper limit value of the rotation speed of the fan 113 corresponding to 60 (dB) which is a noise level (dB) other than the air conditioner by referring to the control table T2. Then, the control unit 321 outputs a control signal RC including 80, which is the upper limit value of the rotation speed, to the air conditioner 100. As a result, the number of rotations per minute of the fan 113 decreases from 100 to 80, and the noise level (dB) of the fan 113 decreases from 65 (dB) to 60 (dB). Accordingly, the sound pressure level (dB) indicating the loudness of the passenger compartment is also reduced from 125 (dB) to 120 (dB) as the reference. As described above, according to the present embodiment, the sound pressure level indicating the loudness of the passenger compartment is kept constant even when the rotational speed of the fan 113 increases as a result of temperature adjustment. . As a result, for example, it is possible to prevent the user's speaking voice or the like from becoming difficult to hear due to the noise level of the fan 113.

  Next, a description will be given of a case where the noise level of the fan 113 does not change, but a cause, for example, road noise is reduced. For example, it is assumed that the sound pressure level (dB) indicating the loudness of the vehicle interior has decreased from 120 (dB) to 115 (dB). The determination unit 323 subtracts 60 (dB), which is the noise level of the fan 113, from 115 (dB), which is the sound pressure level (dB) indicating the loudness of the vehicle interior, to obtain a noise level (dB) other than that of the air conditioner. As a result, 55 (dB) is calculated. Therefore, the determination unit 323 determines that the noise level (dB) 60 (dB) of the fan 113 exceeds 55 (dB), which is a noise level (dB) other than that of the air conditioner. That is, the determination unit 323 determines that the ratio of the noise level (dB) of the fan to the noise level (dB) other than the air conditioner, which is an index indicating the state of the sound environment, exceeds the reference.

  The control unit 321 reads 70 as the upper limit value of the rotation speed of the fan 113 corresponding to 55 (dB) which is a noise level (dB) other than the air conditioner by referring to the control table T2. Then, the control unit 321 outputs a control signal RC including 70 which is the upper limit value of the rotational speed to the air conditioner 100. As a result, the number of rotations per minute of the fan 113 decreases from 80 to 70, and the noise level (dB) of the fan 113 decreases by 5 (dB) from 60 (dB) to 55 (dB). Therefore, the sound pressure level (dB) indicating the loudness of the vehicle interior also decreases from 115 (dB) to 110 (dB). As described above, according to the present embodiment, when the noise level (dB) other than the air conditioner decreases as a result of the temperature adjustment, the noise level (dB) other than the air conditioner decreases according to the decrease. Control is performed to reduce the number of rotations per minute. As a result, the index indicating the state of the sound environment represented by the ratio of the noise level (dB) of the fan 113 to the noise level (dB) other than the air conditioner is kept below the reference. It is possible to prevent difficulty in hearing due to the noise level.

  Note that the processing when the user operates the input device 310 is the same as that in the first embodiment, except that the above-described criterion for the appropriateness of the sound environment is not updated. That is, the rotational speed per minute of the fan 113 is reduced in accordance with the user's operation of the input device 310, and the sound pressure level (dB) indicating the loudness of the passenger compartment is reduced. Although the sensation with respect to the loudness of the passenger compartment varies depending on the user, according to the present embodiment, the loudness of the passenger compartment can be adjusted according to each user.

  As described above, according to the present embodiment, whether or not the index indicating the state of the sound environment in the vehicle interior exceeds the reference based on at least the volume of the vehicle interior sound collected by the sound collection device 330. Therefore, the state of the sound environment in the passenger compartment can be accurately determined. In addition, since the rotation speed of the fan 113 is controlled so that the volume of the sound in the passenger compartment does not exceed the above-mentioned standard, the loudness of the noise source is appropriately controlled according to the state of the sound environment in the passenger compartment. can do.

<Modification>
The present invention is not limited to the above-described embodiments, and various modifications as described below are possible, for example. Moreover, the aspect of the deformation | transformation described below can also combine suitably arbitrarily selected 1 or several.

(Modification 1)
In the above-described embodiment, the analysis unit 324 analyzes the frequency band and sound pressure level of the sound signal Y, cancels the voice of the user, and then uses the vehicle as an example of an index related to the loudness of the vehicle interior. A sound pressure level (dB) indicating the loudness of the room was generated. However, the present invention is not limited to such an embodiment. For example, the analysis unit 324 may determine an index indicating the state of the sound environment or an index related to the loudness of the vehicle interior based on the loudness curve. FIG. 8 is a diagram illustrating an example of a loudness curve. As shown in the loudness curve of FIG. 8, for each frequency band, the standard relationship between the sound pressure level (dB) represented by the sound signal and the auditory level (Phon) at which the sound at that sound pressure level can be heard is Known. Therefore, the analysis unit 324 may convert the sound signal in the corresponding frequency band into a loudness signal representing the loudness in the corresponding frequency band. For example, if the sound signal at 1 kHz is on the loudness curve of 20 Phon as shown in FIG. 8 when the sound pressure level is 20 dB, the analysis unit 324 converts the loudness signal representing 20 Phon into the loudness of the sound in the passenger compartment. It is generated as an index related to safety. In this case, the noise levels stored in the conversion table T1 and the control table T2 may be represented by a loudness signal. As described above, by determining the index based on the loudness curve, it is possible to adjust the sound environment suitable for the user's hearing.

  Further, the analysis unit 324 may generate an index related to the loudness of the vehicle interior by obtaining an average value of sound collected by the sound collection device 330 over a predetermined period. In this way, even if the sound in the passenger compartment may change temporarily, there is no need to control the rotational speed of the fan 113 each time, so that the change in the sound of the fan 113 can be suppressed to a low level. .

(Modification 2)
The input device 310 can be installed at any place in the vehicle interior. For example, you may install in the place near a driver's seat or a passenger seat, and may install in a backseat. Or you may install the input device 310 in the several location in a vehicle interior. Since the state of the sound environment is different between the driver seat or the passenger seat and the rear seat, the sound environment suitable for the user of the rear seat can be adjusted by installing the input device 310 in the rear seat.

(Modification 3)
In the first embodiment, when the loudness of the vehicle interior exceeds the reference as the noise level of the fan 113 increases, it is determined that the index indicating the state of the sound environment exceeds the reference. . That is, according to the first embodiment, when the ratio of the index related to the loudness of the fan 113 associated with the operation amount exceeds the predetermined value with respect to the loudness related index in the vehicle interior, It can also be said that it is determined that the indicator indicating the state exceeds the standard. Therefore, when the ratio of the index related to the loudness of the fan 113 is actually calculated with respect to the index related to the loudness of the vehicle interior, and the ratio exceeds a predetermined value, the index indicating the state of the sound environment is calculated. You may make it determine with having exceeded the reference | standard.

(Modification 4)
In the above-described embodiment, an air conditioner has been described as an example of a noise generation source. However, in addition to an air conditioner, an audio device or a car navigation device may be controlled as a noise generation source. Even devices other than audio devices and car navigation devices can be controlled by the present invention as long as they generate sound that affects the sound environment in the passenger compartment.

(Modification 5)
In the above-described embodiment, a plurality of standards such as weak effect, medium effect, and strong effect are set in advance so that the user can select which standard is used by a user interface (not shown). The aspect which did is demonstrated. However, the present invention is not limited to such an aspect. For example, the sound indicating the loudness of the vehicle interior when the determination unit 323 starts processing immediately after the vehicle is turned on. The initial value of the pressure level (dB) may be used as a reference. Even in this case, the rotational speed of the fan 113 is reduced based on the operation of the input device 310 by the user, and as a result, the sound pressure level (dB) indicating the loudness of the vehicle interior is selected by the user. It is possible that it will be lower than the established standard. In this case, a sound pressure level (dB) indicating the loudness of the lowered vehicle interior is used as the reference.

DESCRIPTION OF SYMBOLS 1 ... Sound environment adjustment system, 100 ... Air conditioner, 110 ... Temperature setting part, 111 ... Temperature monitoring part, 112 ... Fan control part, 113 ... Fan, 114 ... Memory | storage device, 200 ... Other apparatus, 300 ... Sound environment adjustment apparatus , 310 ... input device, 320 ... control device, 321 ... control unit, 322 ... acquisition unit, 323 ... determination unit, 324 ... analysis unit, 330 ... sound collector, 340 ... storage device, RC ... control signal, RD ... rotation Number signal, RS ... control signal, T1 ... conversion table, T2 ... control table, TS ... temperature setting signal, TD ... vehicle compartment temperature signal, X ... input signal, Y ... sound signal.

Claims (9)

A sound collector that collects the sound in the passenger compartment and outputs a sound signal;
An acquisition unit for acquiring an operation amount according to a user operation on a noise generation source mounted on a vehicle;
A determination unit that determines whether or not an index indicating a state of a sound environment in the vehicle interior exceeds a reference based on at least the sound signal;
A control unit that controls the amount of operation so as to reduce the volume of sound of the noise generation source when the determination unit determines that the index indicating the state of the sound environment exceeds a reference;
Comprising
A sound environment adjusting device characterized by that. The judgment part
An analysis unit that analyzes the sound signal and generates an index relating to a loudness of the vehicle interior;
When an index related to the volume of sound in the passenger compartment exceeds a predetermined value, it is determined that an index indicating the state of the sound environment exceeds a reference;
The sound environment adjusting apparatus according to claim 1. The determination unit
An analysis unit that analyzes the sound signal and generates an index relating to a loudness of the vehicle interior;
When the ratio of the index related to the volume of sound of the noise generation source associated with the operation amount acquired by the acquisition unit with respect to the index related to the volume of sound in the vehicle interior exceeds a predetermined value, the sound environment It is determined that the index indicating the status of
The sound environment adjusting apparatus according to claim 1. The determination unit, when an index related to the volume of sound of the noise generation source associated with the movement amount acquired by the acquisition unit exceeds a predetermined value, the index indicating the state of the sound environment exceeds a reference judge,
The sound environment adjusting apparatus according to claim 1. The determination unit
An analysis unit that analyzes the sound signal and generates an index relating to a loudness of the vehicle interior;
The predetermined value is a value obtained by subtracting an index relating to the loudness of the noise generation source associated with the movement amount obtained by the obtaining unit from an index relating to the loudness of the vehicle interior.
The sound environment adjusting apparatus according to claim 4, wherein The indicator is determined based on a loudness curve.
The sound environment adjusting apparatus according to any one of claims 2 to 7, wherein the sound environment adjusting apparatus according to any one of claims 2 to 7 is provided. The noise generation source is an in-vehicle air conditioner, and the operation amount is a rotation speed of the in-vehicle air conditioner.
The sound environment adjusting apparatus according to any one of claims 1 to 6, wherein the sound environment adjusting apparatus according to any one of claims 1 to 6 is provided. Comprising an input device operable by the user;
The determination unit changes the predetermined value based on the operation in the input device.
The sound environment adjusting device according to claim 2, wherein Collect the sound in the passenger compartment,
Output sound signal,
Acquire the amount of movement according to the user's operation for the on-vehicle noise source,
Determining whether or not an index indicating a state of a sound environment in the vehicle interior exceeds a reference based on at least the sound signal;
When it is determined that the index indicating the state of the sound environment exceeds a reference, the operation amount is controlled so as to reduce the sound volume of the noise generation source.
A sound environment adjusting method characterized by the above.

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