Waveform reproduction apparatus

摘要

A method for generating a compressed or expanded waveform from original waveform data is disclosed. A plurality of frequency band-divided waveform data is generated from the original waveform data. Phase and amplitude data having periodically changing amplitudes are extracted for each of the plurality of frequency band-divided waveform data. The periodically changing phase data is converted to periodically changing frequency data, and a temporal change rate of the periodically changing amplitude and frequency data is adjusted for each of the plurality of frequency band-divided waveform data. The temporally adjusted amplitude and frequency data for the plurality of frequency band-divided waveform data is then combined to generate the compressed or expanded waveform.