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:
Jun. 05, 2012
Filed:
Dec. 13, 2007
Markus Buck, Biberach, DE;
Tim Haulick, Blaubeuren, DE;
Martin Rössler, Ulm, DE;
Gerhard Uwe Schmidt, Ulm, DE;
Walter Schnug, Memmingen, DE;
Markus Buck, Biberach, DE;
Tim Haulick, Blaubeuren, DE;
Martin Rössler, Ulm, DE;
Gerhard Uwe Schmidt, Ulm, DE;
Walter Schnug, Memmingen, DE;
Nuance Communications, Inc., Burlington, MA (US);
Abstract
An echo reduction system includes a signal analysis filter that converts an input into sub-band signals. A signal down-sampling circuit down-samples the sub-band signals at a first down-sampling rate. An echo analysis filter converts a loudspeaker signal into echo sub-band signal that are further processed by an echo down-sampling circuit. The circuit down-samples the echo sub-band signals at a second down-sampling rate to generate down-sampled echo sub-band signals. An echo compensation filter folds the down-sampled echo sub-band signals with an estimated impulse response of a loudspeaker-room-input system. A second echo down-sampling circuit down-samples the folded down-sampled echo sub-band signals at a third down-sampling rate to generate estimated echo sub-band signals. The first down-sampling rate is equal to the product of the second and third down-sampling rates.