Method and apparatus for the compression, processing and spectral resolution of electromagnetic and acoustic signals

Abstract From the Canadian patent

A signal that may be represented by a band limited periodic function m(t) is transformed into its z-domain zeros using characteristics of the signal in the neighbourhood of fades of the signal namely a bounds of the fades and the depths of the fades. The z-domain zeros are the zeros of the function in the complex plane and represent local minimums of the function. The z-domain zeros are used to estimate the discrete spectrum of m(t) and the differential phase of m(t) is derived from the envelope of m(t) using the concept of the z-domain zeros. Also speech is compressed based on the z-domain zeros of a signal m(t) that represents a speech signal and knowledge of the location of fades is used …