METHOD AND DEVICE FOR ANALYZING MUSICAL SOUND WAVEFORM, AND RECORDING MEDIUM WHICH RECORDS MUSICAL SOUND WAVEFORM ANALYZING PROGRAM ON IT

摘要

PROBLEM TO BE SOLVED: To make the locus of the peak of frequency spectrum able to be tracked even in sound such as piano high tone which is percussive or pulsatile and is quickly attenuated. ;SOLUTION: The frequencies of base sound and its double sound are detected by analyzing the vicinity of the peak of the frequency spectrum of an original waveform employing a first STF analysis B. Then, the frequency spectrum of an FFT analysis D is filter processed by a frequency mask process C in accordance with the detected frequency. Then, secondary waveforms are generated from the filter processed frequency spectrum by an IFFT process E. Then, an envelope of the secondary waveforms is extracted by an envelope extracting process F, an inverse envelope is multiplied to the secondary waveforms by a normalize process G and normalized time waveforms are obtained. Then, the peak of the frequency spectrum of the normalized time waveforms is racked by a second SFT analysis H. Then, an envelope is given to the result of the peak tracking in an envelope giving process I and musical sound is synthesized in a synthesizing process J.;COPYRIGHT: (C)2001,JPO