US 11,955,938 B2
Acoustic output device and acoustic output method
Tsutomu Kaizuka, Tokyo (JP); Kimihiko Nakano, Tokyo (JP); Yoshio Koike, Akishima (JP); Yoshiteru Uchida, Akishima (JP); and Manabu Sasajima, Akishima (JP)
Assigned to The University of Tokyo, Tokyo (JP); KOGAKUIN UNIVERSITY, Tokyo (JP); and Foster Electric Company, Limited, Akishima (JP)
Appl. No. 17/642,538
Filed by The University of Tokyo, Tokyo (JP); KOGAKUIN UNIVERSITY, Tokyo (JP); and Foster Electric Company, Limited, Akishima-shi (JP)
PCT Filed Sep. 11, 2020, PCT No. PCT/JP2020/034592
§ 371(c)(1), (2) Date Mar. 11, 2022,
PCT Pub. No. WO2021/049652, PCT Pub. Date Mar. 18, 2021.
Claims priority of provisional application 62/899,229, filed on Sep. 12, 2019.
Prior Publication US 2022/0329224 A1, Oct. 13, 2022
Int. Cl. H04R 3/00 (2006.01); H03G 3/30 (2006.01); H04R 1/40 (2006.01); H04R 3/12 (2006.01)
CPC H03G 3/3005 (2013.01) [H04R 1/403 (2013.01); H04R 3/12 (2013.01); H03G 2201/103 (2013.01); H04R 2201/401 (2013.01); H04R 2430/01 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An acoustic output device comprising:
a loudspeaker array with a plurality of loudspeakers arranged in a two-dimensional plane; and
an amplifier array with a plurality of amplifiers, the amplifier array controlling the amplitude and phase of a drive signal for each loudspeaker according to an eigenvector whose ratio of a reactive sound power to an active sound power is large enough among eigenvalue vectors of a radiation mode that are vibration velocity components independently contributing to a complex sound power.