Signal representation

• Time domain
• Frequency domain

Time domain

Example
Sinus function f(t) = A sin(wt + F)

A ... amplitude

w ... angular frequency w = 2pf

t ... time

F ... phase shift

RMS (Root mean square) value of a signal
statistical measure of the magnitude of a varying quantity
allows to calculate the mean power

 

Frequency domain

Frequency analysis

Mathematical basis is the Fourier transform

Different forms:

• Integral Fourier transform
•  Fourier series
• Sampled functions

• Discrete Fourier transform (DFT)

• Laplace transform

• Z-transform