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. 01, 2011
Filed:
Nov. 10, 2004
Applicants:
Masahisa Masuda, Beaverton, OR (US);
Yasuhiro Kume, Tokyo, JP;
Inventors:
Masahisa Masuda, Beaverton, OR (US);
Yasuhiro Kume, Tokyo, JP;
Assignee:
Matech, Inc., Lake Oswego, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Embodiments of the invention provide a small and economical two-way communications device that has both an excellent echo-cancellation function that substantially suppresses echoes over the entire frequency range and an excellent voice-operated exchange function that provides natural switching of conversation sounds while protecting against unnatural disconnection or echoes during conversation, even when a reception signal and a transmission signal are superimposed in a single transducer.