The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2020
Filed:
Aug. 24, 2018
Kabushiki Kaisha Toshiba, Tokyo, JP;
Tatsuhiko Goto, Kanagawa, JP;
Akihiko Enamito, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A rotor blade noise reduction system includes: a plurality of rotor blades; a plurality of first speakers disposed equidistantly on a first circumference which is opposed to one surface of a rotor blade plane; a plurality of second speakers disposed equidistantly on a second circumference which is opposed to the other surface of the rotor blade plane; at least one evaluation microphone configured to acquire noise generated from the rotating rotor blades and control sound generated from the first speakers and the second speakers; and an active sound suppression processor configured to input a plurality of first delay control signals corresponding to the first speakers, and to input a plurality of second delay control signals corresponding to the second speakers.