METHOD FOR IMPROVING TONE QUALITY OF VOICE SIGNAL INPUT BY BONE CONDUCTION MICROPHONE

摘要

PURPOSE: A method for improving tone quality of a voice signal inputted by a bone conduction microphone is provided to change a bone-conducted voice signal into a clear audio signal, thereby improving sense of listening. CONSTITUTION: A voice signal(21) inputted by a bone conduction microphone is inputted to a filtering operation part(22). The filtering operation part filters the voice signal with applying a filter coefficient. A comparator(23) compares the filter signal with the original voice signal(24) which is an ideal voice signal. The comparator outputs an error signal(25) which is a difference between the two signals. A filter coefficient applying part(26) continuously applies coefficients to find out the filter coefficient that the error signal becomes the minimum.