Waveform data analysis method and apparatus suitable for waveform expansion/compression control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 22, 2006
Grant Date -
Jul 18, 2002
app pub date -
Jan 16, 2002
filing date -
Jan 17, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Filtering is performed on original waveform to remove components of a predetermined frequency band from the waveform, and dividing positions of the original waveform data are determined on the basis of envelope levels of the filtered waveform. The dividing positions may be determined on the basis of differentiation of an envelope of the filtered waveform. Rise positions in the original waveform data are detected, and one rise position may be selected from among one or more rise positions detected within a predetermined range of the original waveform and extracted as a dividing position of the original waveform. Presumed beat positions in the original waveform may be detected, and rise positions of the original waveform may be detected within predetermined ranges corresponding to the presumed beat positions. In parallel with reproduction of automatic performance, waveform data are stored in memory along with synchronization control data indicative of relationship in processing timing between the automatic performance and the waveform data.
First Claim
Other Claims data not available
