AUDIO SIGNAL PROCESSING DEVICE, AUDIO SIGNAL PROCESSING METHOD, AND AUDIO SIGNAL PROCESSING PROGRAM

PROBLEM TO BE SOLVED: To extract or eliminate a stationary sound in real time from an audio signal in which a plurality of sound sources are included.SOLUTION: An audio signal processing device comprises: a short-time Fourier transform unit 4 for generating a frequency-domain signal in which short-time Fourier transform is applied to an inputted audio signal; a stationary sound determination unit 5 for determining whether the waveform of a peak portion included in the signal waveform of the frequency domain is a stationary sound or not; a filter coefficient arithmetic unit 6 for dynamically calculating a filter coefficient on the basis of the result of determination by the stationary sound determination unit 5; a comb-shaped filter unit 7, driven by the filter coefficient calculated by the filter coefficient arithmetic unit 6, for filtering the frequency-domain signal; and an inverse Fourier transform unit 8 for converting the output of the comb-shaped filter unit 7 into a time-domain signal and outputting the converted signal.SELECTED DRAWING: Figure 7 【課題】複数の音源が含まれるオーディオ信号の中から定常音をリアルタイムに抽出もしくは除去すること。【解決手段】入力されたオーディオ信号に短時間フーリエ変換を施した周波数領域の信号を生成する短時間フーリエ変換部４と、当該周波数領域の信号波形に含まれるピーク部の波形が定常音であるか否かを判定する定常音判定部５と、定常音判定部５による判定結果に基づいてフィルタ係数を動的に演算するフィルタ係数演算部６と、フィルタ係数演算部６が演算したフィルタ係数によって動作し、周波数領域の信号をフィルタリングする櫛型フィルタ部７と、櫛型フィルタ部７の出力を時間領域の信号に変換して出力する逆フーリエ変換部８と、を備えた。【選択図】図７