US 12,348,938 B2
Acoustic processing device, acoustic processing method, and storage medium
Kazuhiro Nakadai, Wako (JP); Masayuki Takigahira, Wako (JP); and Hirofumi Nakajima, Tokyo (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP); and KOGAKUIN UNIVERSITY, Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP); and KOGAKUIN UNIVERSITY, Tokyo (JP)
Filed on Aug. 31, 2022, as Appl. No. 17/899,668.
Claims priority of application No. 2021-145441 (JP), filed on Sep. 7, 2021.
Prior Publication US 2023/0076123 A1, Mar. 9, 2023
Int. Cl. H04R 3/00 (2006.01); H04R 1/40 (2006.01); H04S 3/00 (2006.01); H04S 7/00 (2006.01)
CPC H04R 3/005 (2013.01) [H04R 1/406 (2013.01); H04S 3/008 (2013.01); H04S 7/30 (2013.01); H04S 2400/01 (2013.01); H04S 2400/15 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An acoustic processing device comprising:
a storage unit configured to store a first transfer function representing a transfer characteristic of a sound from a sound source for each sound source direction;
a sound source direction estimating unit configured to calculate a conversion coefficient of an acoustic signal for each channel in a frequency domain and a spatial spectrum for each sound source direction on the basis of the first transfer function and estimate a sound source direction in which the spatial spectrum becomes a maximum as an estimated sound source direction;
a transfer function estimating unit configured to estimate a transfer function for the estimated sound source direction as a second transfer function by normalizing the conversion coefficients among channels; and
a transfer function updating unit configured to update the first transfer function for the estimated sound source direction using the second transfer function,
wherein the transfer function estimating unit normalizes amplitudes of the conversion coefficients for the channels using a norm of the conversion coefficients among the channels and normalizes phases of the conversion coefficients for the channels using a total sum of the phases of the conversion coefficients among the channels.