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:
Aug. 07, 2018
Filed:
Feb. 08, 2018
Omnivision Technologies, Inc., Santa Clara, CA (US);
Dong Shi, Singapore, SG;
Chung-An Wang, Singapore, SG;
OmniVision Technologies, Inc., Santa Clara, CA (US);
Abstract
A noise-level estimator for a noise suppressor includes a power smoother filter providing smoothed power estimates in timeslices, a minimum follower that represents the lowest smoothed input power, and a maximum follower that represents the highest smoothed input power, the followers subject to leakage factors. The estimator has a speech probability detector receiving outputs of the power smoother and minimum follower; a nonstationary noise detector receiving outputs of both followers; and an estimator receiving outputs of the nonstationary noise detector, power smoother, and speech probability detector and providing a noise estimate. The method includes smoothing intensity of the frequency band; tracking minima and maxima of the smoothed intensity; determining speech-absence probability from the minima and the intensity; determining a nonstationary noise measure from the tracked minima and maxima; determining presence of nonstationary noise; and estimating noise from speech-absence probability, the nonstationary noise measure, and the intensity.