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 freque ncies 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 zero es. It is shown that the proposed TFD-based zero-tracking technique provide s good tracking performance for both mono- and multi-component signals. (C) 1999 Elsevier Science B.V. All rights reserved.