公开(公告)号：US20250016500A1

公开(公告)日：2025-01-09

申请号：US18763306

申请日：2024-07-03

Applicant: ALPS ALPINE CO., LTD.

Inventor： Takeru SONOBE ,  Hiroyuki TAGUCHI

IPC: H04R3/00 ,  B60Q9/00 ,  B60R11/00 ,  B60R11/02 ,  H04R1/02 ,  H04R29/00

Abstract: A “sound system” is provided for outputting a notification sound easy for a specific user to hear within a range in which other users are not bothered. A notification sound output from a notification sound source is output to a driver via a loudspeaker situated on headrest of the driver's seat after gain adjustment by a variable gain amplifier. Gain setter estimates power of noise at each seat based on noise collected by microphone, calculates gain for notification sound that makes notification sound larger than noise at the driver's seat and makes notification sound smaller than noise at a specific seat by using a first transfer function of notification sound from loudspeaker to the user on the driver's seat and a second transfer function of notification sound from loudspeaker to the user on the specific seat, which are previously determined, and sets the gain in the variable gain amplifier.