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Processing Noisy Speech for Enhancement

Author(s): Krishnamoorthy P | Prasanna Mahadeva

Journal: IETE Technical Review
ISSN 0256-4602

Volume: 24;
Issue: 5;
Start page: 351;
Date: 2007;
Original page

The main objective of this paper is to provide an overview of the major techniques that have been proposed for enhancement of noisy speech. This paper also proposes a method for enhancement of noisy speech. The proposed method is motivated as an attempt to minimize the limitations of conventional spectral subtraction method for enhancement of noisy speech. The proposed method involves three steps. In the first step speech and non-speech regions are detected from the degraded speech signal. In the second step, for each speech region, noise components are estimated from the preceding noise regions and are subtracted by conventional spectral subtraction method. In the third step, speech components are enhanced further from the spectral subtracted speech signal for reducing the musical noise, which is the artifact of spectral subtraction method. The processed speech signals from the proposed method seem to be better perceptually compared to that of the spectral subtraction method.
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