THE WAVELET TRANSFORM

THE WAVELET TRANSFORM

OVERVIEW

Mathematical transformations are applied to signals to obtain further information from that signal that is not readily available in the raw signal. Most of the signals in practice are time-domain signals in their raw format. That is, whatever that signal is measuring, is a function of time. When we plot time-domain signals, we obtain a time-amplitude representation of the signal. This representation is not always the best representation of the signal for most signal processing related applications. In many cases, the most distinguished information is hidden in the frequency content of the signal. The frequency spectrum of a signal is basically the frequency components (spectral components) of that signal. The frequency spectrum of a signal shows what frequencies exist in the signal. To examine frequency content of the signal, we need to transform signal from time-domain to frequency domain.