Patent ID: 6324502
Filing Date: 2001-11-27
Classification: G10L

Abstract:
A noisy speech parameter enhancement method, comprising the steps ofreceiving background noise samples and noisy speech samples;determining a background noise power spectral density estimate at M frequencies, where M is a predetermined positive integer, from a first collection of background noise samples;estimating p autoregressive parameters, where p is a predetermined positive integer significantly smaller than M, and a first residual variance from a second collection of noisy speech samples;determining a noisy speech power spectral density estimate at said M frequencies from said p autoregressive parameters and said first residual variance;determining an enhanced speech power spectral density estimate by subtracting said background noise spectral density estimate multiplied by a predetermined positive factor from said noisy speech power spectral density estimate; anddetermining r enhanced autoregressive parameters using an iterative algorithm, where r is a predetermined positive integer, and an enhanced residual variance from said enhanced speech power spectral density estimate using an iterative algorithm.