Efficient Spectral Estimation of Non-Stationary Harmonic Signals Using Harmonic Transform

Abstract

Abstract-Non-stationary harmonic signals cannot be accurately represented by Fourier transform (FT). Fortunately, several methods for representing non-stationary harmonic signals exist including Fan-Chirp trasnform (FChT) or Harmonic transform (HT). This article is focused on the Harmonic transform and its computation. Estimation of slope of fundamental frequency change between analysed segments is essential for computation of the HT. The slope is estimated using several realisations of HT and comparing the spectral flatness. Optimisation of this procedure is presented in the article.