US 11,981,259 B2
Sound generation device for vehicle
Yukifusa Hattori, Aki-gun (JP); Seisuke Mitsunaga, Aki-gun (JP); Hidekazu Shiraishi, Aki-gun (JP); Katsuya Shimizu, Aki-gun (JP); Ryuichi Yamada, Aki-gun (JP); and Chieko Nakagami, Aki-gun (JP)
Assigned to Mazda Motor Corporation, Hiroshima (JP)
Appl. No. 17/636,173
Filed by Mazda Motor Corporation, Hiroshima (JP)
PCT Filed Aug. 12, 2020, PCT No. PCT/JP2020/030691
§ 371(c)(1), (2) Date Feb. 17, 2022,
PCT Pub. No. WO2021/033607, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 2019-150988 (JP), filed on Aug. 21, 2019.
Prior Publication US 2022/0297598 A1, Sep. 22, 2022
Int. Cl. H04R 1/00 (2006.01); B60Q 9/00 (2006.01); G10K 15/02 (2006.01)
CPC B60Q 9/00 (2013.01) [G10K 15/02 (2013.01); H04R 2499/13 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A sound generation device, the sound generation device being installed in a vehicle which travels using an electric-powered motor as a power source, the sound generation device comprising:
a processor configured to set a plurality of frequencies corresponding to a motor rotation speed of the electric-powered motor and generate a synthetic sound signal indicating a synthetic sound including sounds at the plurality of frequencies; and
a speaker configured to output the synthetic sound based on the synthetic sound signal, wherein
the processor sets an increase amount of an output of a sound in a low frequency band large compared to an increase amount of an output of a sound in a high frequency band in a frequency range of the synthetic sound in accordance with an increase in a motor torque value of the electric-powered motor; and
responsive to determining that the motor torque value exceeds a predetermined value, the increase amount of the output of the sound in the low frequency band is decreased.