NOISE ESTIMATING DEVICE AND NOISE ESTIMATING METHOD

• US 20070265736A1
• Filed: 05/09/2007
• Published: 11/15/2007
• Est. Priority Date: 05/12/2006
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: FURUKAWA, Eiji, MENSLER, Michel, TAKAMATSU, Yoshiro
• Granted Patent: US 7,904,212 B2
• Time in Patent Office: Days
• US Class Current: 701/1
• CPC Class Codes: G01H 17/00 Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups see provisionally also G01H1/00
• CPC Class Codes: G10K 11/17813 characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
• CPC Class Codes: G10K 11/17853 of the filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17873 using a reference signal without an error signal, e.g. pure feedforward
• CPC Class Codes: G10K 2210/111 Directivity control or beam pattern
• CPC Class Codes: G10K 2210/12 Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
• CPC Class Codes: G10K 2210/1282 Automobiles
• CPC Class Codes: G10K 2210/30232 Transfer functions, e.g. impulse response

Abstract

A noise estimating device includes a plurality of sensors and an estimating section. The sensors are configured and arranged to be positioned in a plurality of prescribed locations on a vehicle body of a vehicle. The sensors are configured and arranged to detect vibrations of the vehicle body. The estimating section is configured to estimate an external vibration value based on the vibrations detected by the sensors and transfer characteristics between the sensors and a vibration input location where an external vibration enters the vehicle body. The estimating section is further configured to estimate a noise within a vehicle interior space based on the external vibration value and a transfer characteristic between the vibration input location and a reference region in the vehicle interior space.

Claims

1. A noise estimating device comprising:

a plurality of sensors configured and arranged to be positioned in a plurality of prescribed locations on a vehicle body of a vehicle and configured and arranged to detect vibrations of the vehicle body; and

an estimating section configured to estimate an external vibration value based on the vibrations detected by the sensors and transfer characteristics between the sensors and a vibration input location where an external vibration enters the vehicle body, and to estimate a noise within a vehicle interior space based on the external vibration value and a transfer characteristic between the vibration input location and a reference region in the vehicle interior space.

2. The noise estimating device according to claim 1, wherein

the estimating section is further configured to adjust the transfer characteristic between the vibration input location and the reference region according to a propagation lag component of a signal in ambient air when estimating the noise within the vehicle interior space.

3. A noise control apparatus comprising:

a noise estimating device including

a plurality of sensors configured and arranged to be positioned in a plurality of prescribed locations on a vehicle body of a vehicle and configured and arranged to detect vibrations of the vehicle body, and

an estimating section configured to estimate an external vibration value based on the vibrations detected by the sensors and transfer characteristics between the sensors and a vibration input location where an external vibration enters the vehicle body, and to estimate a noise within a vehicle interior space based on the external vibration value and a transfer characteristic between the vibration input location and a reference region in the vehicle interior space; and

an actuator configured and arranged to vibrate the vehicle body to produce a sound wave that cancels out the noise estimated by the noise estimating device.

4. The noise control apparatus according to claim 3, wherein

the estimating section of the noise estimating device is further configured to adjust the transfer characteristic between the vibration input location and the reference region according to a propagation lag component of a signal in ambient air when estimating the noise.

5. The noise control apparatus according to claim 3, wherein

the estimating section of the noise estimating device is further configured to subtract a vibration component corresponding to a vibration of the vehicle body caused by the actuator from the vibrations detected by the sensors when estimating the noise.

6. The noise control apparatus according to claim 3, wherein

the estimating section of the noise estimating device is configured to subtract a vibration component corresponding to a vibration of the vehicle body caused by driving a drive source of the vehicle from the vibrations detected by the sensors when estimating the noise.

7. The noise control apparatus according to claim 3, further comprising

a passenger information detecting section configured and arranged to detect passenger information including at least one of a number of passengers and a position of passengers in the vehicle,

the estimating section of the noise estimating device being further configured to select one of a plurality of transfer characteristics corresponding to the passenger information stored in advance based on the at least one of the number of passengers and the position of passengers detected by the passenger information detecting section as the transfer characteristic between the vibration input location and the reference region when estimating the noise.

8. A noise estimating device comprising:

vibration detecting means for detecting vibrations of a vehicle body of a vehicle at a plurality of prescribed locations on the vehicle body;

external vibration estimating means for estimating an external vibration value based on the vibrations detected by the vibration detecting means and transfer characteristics between the prescribed locations and a vibration input location where an external vibration enters the vehicle body; and

noise estimating means for estimating a noise within a vehicle interior space based on the external vibration value and a transfer characteristic between the vibration input location and a reference region in the vehicle interior space.

9. A noise estimating method comprising:

detecting vibrations of a vehicle body of a vehicle at a plurality of prescribed locations on the vehicle body;

estimating an external vibration value based on the vibrations detected and transfer characteristics between the prescribed locations and a vibration input location where an external vibration enters the vehicle body; and

estimating a noise within a vehicle interior space based on the external vibration value and a transfer characteristic between the vibration input location and a reference region in the vehicle interior space.

10. The noise estimating method according to claim 9, wherein

the estimating the noise includes adjusting the transfer characteristic between the vibration input location and the reference region according to a propagation lag component of a signal in ambient air.

11. A noise controlling method comprising:

detecting vibrations of a vehicle body of a vehicle at a plurality of prescribed locations on the vehicle body;

estimating an external vibration value based on the vibrations detected and transfer characteristics between the prescribed locations and a vibration input location where an external vibration enters the vehicle body;

estimating a noise within a vehicle interior space based on the external vibration value and a transfer characteristic between the vibration input location and a reference region in the vehicle interior space; and

vibrating the vehicle body to produce a sound wave that cancels out the noise estimated.

12. The noise controlling method according to claim 11, wherein

the estimating of the noise includes adjusting the transfer characteristic between the vibration input location and the reference region according to a propagation lag component of a signal in ambient air.

13. The noise controlling method according to claim 11, wherein

the estimating of the noise includes subtracting a vibration component corresponding to a vibration of the vehicle body caused by the vibrating of the vehicle body from the vibrations detected.

14. The noise controlling method according to claim 11, comprising

the estimating of the noise includes subtracting a vibration component corresponding to a vibration of the vehicle body caused by driving a drive source of the vehicle from the vibrations detected.

15. The noise controlling method according to claim 11, further comprising

detecting passenger information including at least one of a number of passengers and a position of passengers in the vehicle,

the estimating of the noise includes selecting one of a plurality of transfer characteristics corresponding to the passenger information stored in advance based on the at least one of the number of passengers and the position of passengers detected by the detecting of the passenger information as the transfer characteristic between the vibration input location and the reference region.