Invention Grant
- Patent Title: Electric powered work machine and method of controlling noise generated by electric powered work machine
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Application No.: US17583354Application Date: 2022-01-25
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Publication No.: US11841033B2Publication Date: 2023-12-12
- Inventor: Hideaki Takano
- Applicant: MAKITA CORPORATION
- Applicant Address: JP Anjo
- Assignee: MAKITA CORPORATION
- Current Assignee: MAKITA CORPORATION
- Current Assignee Address: JP Anjo
- Agency: Oliff PLC
- Priority: JP 21011309 2021.01.27
- Main IPC: F04D29/66
- IPC: F04D29/66 ; F04D25/06 ; G10K11/178 ; A47L9/10 ; A47L5/36

Abstract:
An electric powered work machine according to one aspect of the present disclosure includes a first and a second digital filters, a control sound source, an error sensor, and a characteristics adjustor. The first digital filter includes a series of taps and generates a control signal. The control sound source produces an artificial noise in accordance with the control signal. The error sensor converts a synthesized sound of the artificial noise and a target noise at a canceling location to an error signal. The second digital filter includes N taps and generates a filtered reference signal. The characteristics adjustor uses the error signal and the filtered reference signal to adjust a coefficient of each tap of M taps in the series of taps. Each of M and N is a positive integer satisfying M
Public/Granted literature
- US20220235798A1 ELECTRIC POWERED WORK MACHINE AND METHOD OF CONTROLLING NOISE GENERATED BY ELECTRIC POWERED WORK MACHINE Public/Granted day:2022-07-28
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