How to plot the periodic digital spectrum?

1. How do you plot a signal spectrum?
2. What is the spectrum of a periodic signal?
3. How do you plot amplitude and phase spectrum?

How do you plot a signal spectrum?

Use fft to compute the discrete Fourier transform of the signal. y = fft(x); Plot the power spectrum as a function of frequency. While noise disguises a signal's frequency components in time-based space, the Fourier transform reveals them as spikes in power.

What is the spectrum of a periodic signal?

A signal's frequency domain expression is its spectrum.

A periodic signal can be defined either in the time domain (as a function) or in the frequency domain (as a spectrum).

How do you plot amplitude and phase spectrum?

The exponential Fourier series representation of a periodic function x(t) has amplitude coefficients Cn which are complex and can be represented by magnitude and phase. Hence, we can plot the amplitude spectrum (|Cn| versus ω) and the phase spectrum (∠Cnversusω).