公开(公告)号：US20230137143A1

公开(公告)日：2023-05-04

申请号：US17969219

申请日：2022-10-19

Applicant: MAKITA CORPORATION

Inventor： Hideaki TAKANO ,  Hirofumi MIYAZATO

IPC: A47L9/00 ,  G10K11/178

Abstract: A work machine includes a housing. The housing at least partly houses a machine. The housing has an opening. The work machine includes a path leading into the housing from the opening. The work machine includes a controller and a speaker. The controller is configured to cause a speaker to output a control sound for reducing operating noise. The operating noise is generated in the housing by motion of the machine and propagates in the path from a source of the operating noise to the opening. The speaker is arranged so that the control sound propagates in the path with its wavefront parallel to a wavefront of the operating noise that propagates in the path.