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. 26, 2022
Filed:
Mar. 31, 2021
Amazon Technologies, Inc., Seattle, WA (US);
Mohamed Mansour, Cupertino, CA (US);
Shobha Devi Kuruba Buchannagari, Fremont, CA (US);
Amazon Technologies, Inc., Seattle, WA (US);
Abstract
Techniques for improving microphone noise suppression are provided. A system for noise-suppression may include a beam selector component that applies logic to select a beam most likely corresponding to a direction of a noise source and keeps the beam selection steady rather than switching the beam too often to avoid processing complications. The selected beam may be used as a reference in an adaptive filter which outputs a noise estimate. The noise estimate and raw microphone data may be used to adapt the adaptive filter. A parallel filter which adapts after a time delay may be applied to the reference in order to prevent interference. An attenuation factor may be used to scale the noise estimate based on noise diffuseness, signal quality, and/or a gain limit. The scaled noise estimate may be subtracted from microphone input data to produce output audio data with improved signal quality and maintained signal coherence.