Time
and frequency are inherently coupled. Speedup the playback
of a recording (time-domain) and the perceived pitch of
the music will be higher than the original (frequency-domain).
For many applications, changing time without changing frequency
and vice versa is desirable. The focus of this talk will
be on a perceptually relevant signal model that allows the
decoupling of time and frequency. Augmenting the model parameters
provides a means for a wide range of musically interesting
transformations when regenerating the signal. The model
assumes audio signals are composed of three basic components:
sinusoids, transients, and noise. In addition to the signal
processing methods to extract these parameters in a perceptually
meaningful way, the history of such models and sound examples
of various transformations will be presented.
