Time-frequency distribution spectral polynomials for instantanous frequency estimation

The local autocorrelation function of the time-frequency distribution (TFD), defined by an appropriate kernel, is used to form a spectral polynomial. Some of the roots of this polynomial correspond to the instantaneous frequencies of the input signal. In this paper, we use extended version of Newton's method for root-finding to obtain the trajectories of the signal IF zeroes. It is shown that the proposed TFD-based zero-tracking technique provides good tracking performance for both mono- and multi-component signals. (C) 1999 Elsevier Science B.V. All rights reserved.