Pitch-shifting audio signals using sparse atomic approximations

Authors:
Bob L. Sturm;Laurent Daudet;Curtis Roads
Affiliations:
University of California, Santa Barbara, California;Université Pierre et Marie, Paris France;University of California, Santa Barbara, California
Venue:
Proceedings of the 1st ACM workshop on Audio and music computing multimedia
Year:
2006

Citing 3
Cited 0

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Abstract

As a combination of time and frequency modeling,sparse atomic representation provides a means for effective and interesting time-frequency modifications of signals. A drawback is the intensive computation required to find the representation. New tools however greatly speed the process and facilitate experimentation with real signals. We have experimented with the modification of audio signals, specifically pitch-shifting, using sparse atomic approximations found by the matching pursuit algorithm. A na ïve approach,where phase is not taken into account, produces surprisingly good results for signals having soft or no transients.An artifact sounding like amplitude modulation appears however, which we show can be reduced by a phase optimization algorithm. Finally we discuss a more sophisticated approach to time-frequency modifications in general using atomic representations.