A frequency-domain representation also includes information on the phase shift that must be applied to each frequency component in order to recover the original time signal with a combination of all the individual frequency components.Ī signal can be converted between the time and frequency domains with a pair of mathematical operators called a transform. While time-domain analysis shows how a signal changes over time, frequency-domain analysis shows how the signal's energy is distributed over a range of frequencies. Frequency-domain analysis is widely used in such areas as communications, geology, remote sensing, and image processing. The example answers basic questions such as: what is the meaning of the magnitude and phase of an FFT? Is my signal periodic? How do I measure power? Is there one, or more than one signal in this band?įrequency-domain analysis is a tool of utmost importance in signal processing applications. The example discusses the advantages of using frequency-domain versus time-domain representations of a signal and illustrates basic concepts using simulated and real data. This example shows how to perform and interpret basic frequency-domain signal analysis.
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