Instantaneous and frequency-warped techniques for source separation and signal parametrization

This paper summarizes several contributions to the study of audio signal parameterization and source separation. The philosophy of frequency-warped signal processing provides powerful means for separating the AM and FM contributions to the MS bandwidth of a complex-valued, frequency-varying sinusoid p[n], transforming it into a signal with slowly-varying parameters. The use of frequency- and harmonic-locked loops to track the phase variation of analytic signals provides the necessary accurate instantaneous frequency information to drive frequency-warped filtering.