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:
Apr. 29, 2014
Filed:
Aug. 31, 2009
Richard C. Hendriks, Vlaardingen, NL;
Jesper Jensen, Smørum, DK;
Ulrik Kjems, Smørum, DK;
Richard Heusdens, Alkmaar, NL;
Richard C. Hendriks, Vlaardingen, NL;
Jesper Jensen, Smørum, DK;
Ulrik Kjems, Smørum, DK;
Richard Heusdens, Alkmaar, NL;
Oticon A/S, Smorum, DK;
Abstract
A method estimates noise power spectral density (PSD) in an input sound signal to generate an output for noise reduction of the input sound signal. The method includes storing frames of a digitized version of the input signal, each frame having a predefined number N2 of samples corresponding to a frame length in time of L=N/sampling frequency. It further includes performing a time to frequency transformation, deriving a periodogram comprising an energy content |Y|from the corresponding spectrum Y, applying a gain function G(k,m)=f(σ(km),σ), |Y(k,m)|), to estimate a noise energy level |Ŵ|in each frequency sample, where σis the speech PSD and σthe noise PSD. It further includes dividing spectra into a number of sub-bands, and providing a first estimate |{circumflex over (N)}|of the noise PSD level in a sub-band and a second, improved estimate |{circumflex over (N)}|of the noise PSD level in a subband by applying a bias compensation factor B to the first estimate.