High resolution spectrograms using a component optimized short-term fractional Fourier transform

We present an algorithm based on a short-term representation of the fractional Fourier transform which is highly suited to signals that contain multiple non-stationary components. To compare the time-frequency resolution of such signals using our proposed technique, we analyze several signals which contain multiple non-stationary components, including a synthetic signal and a bat echolocation signal. We demonstrate that our technique offers time-frequency representations with superior time-frequency resolution than several other established methods. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.