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:
Sep. 17, 2019
Filed:
Apr. 30, 2018
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Benjamin Hutchins, Cremorne, AU;
Brenton Robert Steele, Cremorne, AU;
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A device for noise estimation comprises a first microphone capturing a nominal speech signal, and a second microphone capturing a nominal noise signal. A generalized sidelobe canceller of the device applies spatial noise reduction, and comprises a blocking matrix filter to adaptively process the nominal speech signal to produce a speech cancellation signal, a node for subtracting the speech cancellation signal from the nominal noise signal to produce a noise reference signal, a noise cancellation filter to adaptively filter the noise reference signal to produce a noise cancellation signal; and a node for subtracting the noise cancellation signal from the nominal speech signal to produce a speech reference signal. An adaptive noise estimation module of the device comprises a node for subtracting the noise reference signal from the speech reference signal and outputting a difference signal; a smoothing filter for filtering the difference signal to produce a long term difference signal; and a node for adding the long term difference signal to the noise reference signal to produce an enhanced noise reference signal.