Matlab for Unwrapping Spectral Phase

When spectral phase is processed, it is often necessary to unwrap the phase to make it a ``continuous'' function. Below is a simple matlab function for this purpose. It is based on the assumption that phase jumps by more than radians must have been ``wrapped''. That is, multiples of are added or subtracted so that the phase changes by no more than from one spectral bin to the next. Bin 0 (corresponding to dc) is arbitrarily chosen as ``unwrapped'' and used as a starting point for the unwrapping algorithm.

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Subsections

• Matlab listing: unwrap.m

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About the Author: Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.