Frequency domain analysis

Abstract

In this paper it is presented the second stage analysis used to determine the signal quality coefficient for vibro-acoustic signals. After successfully determining the integrity coefficient in the “first stage analysis on determining the Signal Quality Coefficient in vibro-acoustic domain-waveform integrity analysis” paper a second and deeper analysis is presented. This is a frequency domain analysis and uses an algorithm of evaluating the spectral resemblance between two analyzed vibro-acoustic signals. Spectrum normalization method is used. By accessing the lost or gained information percentage of spectral components for the targeted signal, a Signal Quality Coefficient (SQC) is determined. The SQC frequency analysis returns a value (percentage) which describes the quality of “target” signal reported to the “reference” signal.