Fs = 100; t = 0:1/Fs:1; x = cos(2*pi*90*t); % appears as 10 Hz plot(t,x) Problems: Frequency response, pole-zero plots, filter types (FIR/IIR).
1. Chapter 2 – Discrete-Time Signals & Systems Typical Problems: Convolution, stability/causality, difference equations.
( f_\textin = 90,\textHz, f_s = 100,\textHz ) ( k=1 ): ( |90 - 100| = 10,\textHz ) → aliased at 10 Hz.