	US 11,996,076 B2
	Active noise reduction device, vehicle, and anomaly determination method
Kazuhisa Kotegawa, Osaka (JP)
Assigned to PANASONIC AUTOMOTIVE SYSTEMS CO., LTD., Kanagawa (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on May 24, 2022, as Appl. No. 17/752,356.
Application 17/752,356 is a continuation of application No. PCT/JP2020/043152, filed on Nov. 19, 2020.
Claims priority of application No. 2019-217059 (JP), filed on Nov. 29, 2019.
Prior Publication US 2022/0284879 A1, Sep. 8, 2022
Int. Cl. G10K 11/178 (2006.01); H04R 3/00 (2006.01); H04R 29/00 (2006.01)

CPC G10K 11/17823 (2018.01) [G10K 11/17817 (2018.01); G10K 11/17835 (2018.01); G10K 11/17854 (2018.01); H04R 3/00 (2013.01); H04R 29/00 (2013.01); G10K 2210/1282 (2013.01); G10K 2210/12821 (2013.01); G10K 2210/501 (2013.01); H04R 2499/13 (2013.01)]

20 Claims

20. An anomaly determination method to be executed by a computer, the anomaly determination method comprising:

outputting a test signal to a loudspeaker, the loudspeaker being attached to a vehicle, the loudspeaker being used to output a canceling sound for reducing noise in a space in the vehicle; and

determining whether a reference signal source attached to the vehicle includes an anomaly, based on a reference signal obtained from the reference signal source and having a correlation with the noise when the test signal is outputted to the loudspeaker,

wherein the reference signal source includes an acceleration sensor and a microphone,

the noise includes a road noise generated when the vehicle moves on the road, and

in the determining, the computer determines whether the reference signal source includes the anomaly, when the test signal is outputted to the loudspeaker, in an attachment of the reference signal source to the vehicle.