US 9,520,140 B2 · Speech dereverberation methods, devices and systems

Abstract

Improved audio data processing method and systems are provided. Some implementations involve dividing frequency domain audio data into a plurality of subbands and determining amplitude modulation signal values for each of the plurality of subbands. A band-pass filter may be applied to the amplitude modulation signal values in each subband, to produce band-pass filtered amplitude modulation signal values for each subband. The band-pass filter may have a central frequency that exceeds an average cadence of human speech. A gain may be determined for each subband based, at least in part, on a function of the amplitude modulation signal values and the band-pass filtered amplitude modulation signal values. The determined gain may be applied to each subband.

Claims20

Dependent claims

A method, comprising:

receiving a signal that includes frequency domain audio data;
applying a filterbank to the frequency domain audio data to produce frequency domain audio data in a plurality of subbands;
determining amplitude modulation signal values for the frequency domain audio data in each subband;
applying a band-pass filter to the amplitude modulation signal values in each subband to produce band-pass filtered amplitude modulation signal values for each subband, the band-pass filter having a central frequency that exceeds an average cadence of human speech;
determining a gain for each subband based, at least in part, on a function of the amplitude modulation signal values and the band-pass filtered amplitude modulation signal values;
and
applying a determined gain to each subband.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/782,746Filed 31 Mar 2014 · us provisional application

Priority

10 Apr 2013

Published

US 2016/0035367 A14 Feb 2016

Granted

13 Dec 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G10L 21/0232
Characterised by the method used for estimating noise: processing in the frequency domain
G10L 21/0208
Speech enhancement, e.g. noise reduction or echo cancellation: noise filtering
G10L 25/18
Characterised by the type of extracted parameters: the extracted parameters being spectral information of each sub-band
G10L 25/21
Characterised by the type of extracted parameters: the extracted parameters being power information

Speech dereverberation methods, devices and systems

Life of this patent

Speech dereverberation methods, devices and systems

Life of this patent

Abstract

Claims20