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:
Jul. 24, 2001
Filed:
Jun. 26, 1998
Toshiaki Takahashi, Tokyo, JP;
Hidenori Oku, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A speakerphone of the present invention can obtain an output in which an acoustic coupling component between a louder speaker and a speech microphone has been removed. The loudspeaker telephone set of the present invention comprises a noise canceling microphone,which is located near the speech microphone,, a band-pass filter amplifier,for extracting only a partial frequency component of a signal from the noise canceling microphone,and a differential amplifier,for adding a signal extracted by the band-pass filter amplifier,in opposite phase to a signal from the speech microphone,so that an acoustic coupling component between the louder speaker,and the speech microphone,is canceled by the result of the above addition.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile