TIME SCALING METHOD, PITCH SHIFT METHOD, AUDIO DATA PROCESSING DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To convert into a high quality sound in a phase continuous processing using a FFT system for achieving time scaling and a pitch shift.;SOLUTION: An audio data processing device includes: a FFT section 21 for converting digital audio data into an amplitude and a phase for each frequency component; and a phase continuous processing section 33 which estimates a phase after time expansion using a differential value between a phase obtained by FFT converting the digital audio data again at execution timing different by a time expansion length from an execution timing of the FFT section 21 and the phase obtained by the FFT section 21 as a phase change amount, and performs phase continuous processing.;COPYRIGHT: (C)2014,JPO&INPIT