Signal Spectra

By Fourier theory, any waveform can be represented by a summation of a (possibly infinite) number of sinusoids, each with a particular amplitude and phase. Such a representation is referred to as the signal's spectrum (or it's frequency-domain representation). It is often easier to analyze signals and signal networks in terms of their spectral representations. As well, there are many instances where it is easier to synthesize a signal using a frequency-domain approach.

Why is the spectral view useful?

How is a spectrum obtained?

The FFT

Time / Frequency Resolution

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