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:
Sep. 19, 2023
Filed:
Sep. 29, 2020
Applicant:
Foster Electric Company, Limited, Tokyo, JP;
Inventors:
Yuichi Sakamoto, Tokyo, JP;
Mitsuharu Watanabe, Tokyo, JP;
Assignee:
Foster Electric Company, Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
A61F 11/06 (2006.01); G10K 11/178 (2006.01); F24F 13/02 (2006.01); F24F 13/24 (2006.01);
U.S. Cl.
CPC ...
G10K 11/17857 (2018.01); F24F 13/0263 (2013.01); F24F 13/24 (2013.01); G10K 11/17861 (2018.01); G10K 2210/105 (2013.01); G10K 2210/112 (2013.01);
Abstract
A reference microphone for detecting noise is located under a first duct. The noise is in the form of a first plane wave in the first duct. A speaker is located on a top of the first duct. Connected to an upper part of the first duct is a second duct including an error microphone. The first plane wave in the first duct passes through an acoustic path and reaches the second duct. The error microphone detects the sound, and the speaker outputs a second plane wave with an opposite phase for canceling the first plane wave.