Patent ID: 8015002
Filing Date: 2011-09-06
Classification: G10L

Abstract:
1. A system that improves speech quality comprising: a spectral converter that is configured to digitize and convert a time varying signal into the frequency domain; a background noise estimator configured to measure a background noise that is present in the time varying signal detected by a receiver; a spectral separator in communication with the spectral converter and the background noise estimator that is configured to divide a power spectrum of a speech segment; a modeler in communication with the spectral separator that fits a plurality of substantially linear functions to differing portions of the speech segment, where the modeler is configured to fit a first line of the plurality of substantially linear functions to a first frequency portion of the speech spectrum and a second line of the plurality of substantially linear functions to a second frequency portion of the speech spectrum; a dynamic noise adjuster programmed to designate the spectral magnitude of a noisy portion of the speech segment by designating a dynamic adjustment factor that corresponds to the noisy portion of the speech segment, where the dynamic noise adjuster is programmed to calculate a difference in slope between the first line and the second line, and calculate the dynamic adjustment factor based on the difference in slope; and a dynamic noise processor programmed to attenuate a portion of the noise detected in one or more portions of the speech segment based on the dynamic adjustment factor.