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:
Jan. 27, 2004
Filed:
Sep. 04, 2001
Applicant:
Inventor:
Dietmar Ruwisch, 12557 Berlin, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 1/500 ; H04R 2/900 ;
U.S. Cl.
CPC ...
H04B 1/500 ; H04R 2/900 ;
Abstract
Filter system designed to remove loudspeaker-generated sound signals from a microphone signal, comprising a stereo sampling unit for sampling the interference-bearing microphone signal as well as the interfering loudspeaker signal in time (t) to generate samples x(t) and z(t) for provision to a computation unit which derives the transfer function H(f,T) effective between the loudspeaker and the microphone and applies that function to a filter unit which acts to restore the interference-free microphone signal y(t) from x(t), z(t) and H(f,T).