VOICE RESIDUAL ECHO SUPPRESSION APPARATUS FOR CORRECTLY ESTIMATING THE DENSITY OF POWER SPECTRUM USING HARMONIC COMPONENT OF AUDIO SIGNAL AND RESIDUAL ECHO AND A METHOD THEREOF

摘要

PURPOSE: A voice residual echo suppression apparatus and a method are provided to enhance recognition performance of voice recognizer by elevating voice clearness of speaker through revision using harmonic component in the mobile communication.;CONSTITUTION: An estimating unit(220) estimates a power spectrum density of noise, residual echo, and voice signal from the input signal. A residual echo correction unit(230) corrects a power spectrum density of the residual echo using harmonic component of residual echo estimated from power spectrum density of the residual echo. A voice signal correction unit(240) corrects a power spectrum density of the audio signal using harmonic component of voice signal estimated from the power spectrum density of the voice signal. A removing unit(250) removes residual echo using the power spectrum density of the noise, the power spectrum density of corrected residual echo, and the power spectrum density of corrected voice signal.;COPYRIGHT KIPO 2013;[Reference numerals] (220) Estimating unit; (230) Residual echo correction unit; (240) Voice signal correction unit; (250) Removing unit; (260) Input unit; (260) Output unit