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A CODEBOOK-BASED SPEECH ENHANCEMENT METHOD USING SPEECH ABSENCE PROBABILITY AND APPARATUS THEREOF
A CODEBOOK-BASED SPEECH ENHANCEMENT METHOD USING SPEECH ABSENCE PROBABILITY AND APPARATUS THEREOF
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机译：利用语音缺席概率及其装置的基于码本的语音增强方法
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摘要
PURPOSE: A codebook-based speech enhancement method using a speech presence probability and a device thereof are provided to be robust in a fast-changing noise environment by applying the speech presence probability to a codebook-based speech enhancement algorithm. CONSTITUTION: A voice recognition enhancement device converts an inputted voice signal from a time domain signal into a frequency domain signal (S11). The device calculates a binary estimation model for a speech absence probability (SAP) (S16). The device selects a noise codebook and clean voice codebook of the voice signal (S13,S15). The device calculates the gain of a noise without the presence of a clean voice and the gain of the noise with the presence of a clean voice through the SAP and determines a parameter set (S17). The device removes the noise by using Wiener filtering (S18). [Reference numerals] (AA) Input signal y = x + d; (BB) Input signal spectrum; (CC) Noise code book; (DD) Clean voice code book; (S12) Estimate noise; (S13) Select a noise code vector (IS-D); (S15) Select a voice code vector (IS-D); (S16) SAP modeling; (S17) Estimate a gain (_x^2, _d^2) and calculate an optimal parameter set
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