SPEECH ENHANCEMENT METHOD BY OVERWEIGHTING GAIN WITH NONLINEAR STRUCTURE IN WAVELET PACKET TRANSFORM

A sound quality enhancement method by overweighting gain of a nonlinear structure in a wavelet packet area is provided to restrain the generation of musical noise efficiently and ensure reliable intelligibility in an enhanced voice. A sound quality enhancement method by overweighting gain of a nonli...

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Bibliographic Details
Main Authors KWON, YOUNG HUN, YANG, SUNG IL, JUNG, SUNG IL
Format Patent
LanguageEnglish
Published 26.12.2007
Subjects
ACOUSTICS
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
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Summary:A sound quality enhancement method by overweighting gain of a nonlinear structure in a wavelet packet area is provided to restrain the generation of musical noise efficiently and ensure reliable intelligibility in an enhanced voice. A sound quality enhancement method by overweighting gain of a nonlinear structure in a wavelet packet area comprises the following steps of: generating a converting signal that a voice signal polluted by noise is converted by UWPT(Uniform Wavelet Packet Transform); calculating a relative size difference, which is an identifier for calculating a relative difference between the amount of noise existing in a sub band and the amount of a voice polluted by noise; calculating the overweighting gain of the nonlinear structure from the relative size difference; calculating a transformed time-varying gain function based on an LSL(Least-Squares Line) algorithm; and performing spectral subtraction using the transformed time-varying gain function.
Bibliography:Application Number: KR20060115012