US 12,236,933 B2
Active noise reduction system, active noise reduction method, and non- transitory computer-readable storage medium
Xun Wang, Saitama (JP); and Toshio Inoue, Saitama (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Mar. 22, 2023, as Appl. No. 18/188,156.
Claims priority of application No. 2022-051662 (JP), filed on Mar. 28, 2022.
Prior Publication US 2023/0306949 A1, Sep. 28, 2023
Int. Cl. G10K 11/178 (2006.01)
CPC G10K 11/17854 (2018.01) [G10K 11/17815 (2018.01); G10K 11/17881 (2018.01); G10K 2210/3045 (2013.01)] 9 Claims
OG exemplary drawing
 
8. An active noise reduction method, comprising:
acquiring a plurality of noise signals output from a plurality of noise microphones;
selecting a plurality of reference signals and an error signal from among the plurality of noise signals, the plurality of reference signals corresponding to a noise, the error signal corresponding to an error between the noise and a canceling sound;
generating a control signal of the canceling sound from the plurality of reference signals by using a plurality of control filters; and
adaptively updating the plurality of control filters by using a plurality of acoustic transmission filters including:
at least one adaptive update filter configured to be adaptively updated; and
at least one non-adaptive update filter configured to be updated based on an update value of the adaptive update filter.