Spectrum


(Power) Spectrum

Let s\boldsymbol{s} a signal and s^\hat \boldsymbol{s} its Fourier transform. The (power) spectrum of s\boldsymbol{s} is the (squared) modulus of s^\hat \boldsymbol{s}: Spectrum(s)=s^PowerSpectrum(s)=s^2 \text{Spectrum}(\boldsymbol{s}) = |\hat \boldsymbol{s}|\quad \text{PowerSpectrum}(\boldsymbol{s}) = |\hat \boldsymbol{s}|^2

if s\boldsymbol{s} is real, the power spectrum is symmetric with respect to the frequency 00