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Impact and High-Pitch Noise Suppression Based on Spectral Entropy
Arata KAWAMURA Noboru HAYASAKA Naoto SASAOKA
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/04/01
Online ISSN: 1745-1337
Type of Manuscript: PAPER
Category: Engineering Acoustics
zero phase signal, speech enhancement, noise suppression, impact noise, damped oscillation,
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We propose an impact and high-pitch noise-suppression method based on spectral entropy. Spectral entropy takes a large value for flat spectral amplitude and a small value for spectra with several lines. We model the impact noise as a flat spectral signal and its damped oscillation as a high-pitch periodic signal consisting of spectra with several lines. We discriminate between the current noise situations by using spectral entropy and adaptively change the noise-suppression parameters used in a zero phase-based impact-noise-suppression method. Simulation results show that the proposed method can improve the perceptual evaluation of the speech quality and speech-recognition rate compared to conventional methods.