Instantaneous Power Spectrum*

Abstract

This paper examines the spectral content of time varying signals using a modified version of the Instantaneous Power Spectrum (IPS). The Pseudo Wigner-Ville Distribution (PWD) has been used extensively to display the time varying spectral information. Problems of PWD are spectral cross terms and endpoint resolution. The modified IPS is shown to be much less sensitive to these types of problems. Furthermore, it can operate with real signals sampled at the Nyquist rate. Representative cases are provided.