## Understanding of discrete signals

Discrete signals can be generated by software or obtained from real world through ADC. Discrete signals are sampled from analog signals. So you get samples in fixed time intervals. Discrete signal is as sequence of numbers. The element number n of sequence is marked as x(n). The most common number rows: Unit sample sequence d[n] = 1, if n=0 d[n] = 0, otherwise You can describe it in Matlab like % Plot an unit impulse signal n = -5:5; x = 0*n; index=find(n==0); x(index)=1; % plot stem(n, x); axis([-inf, inf, -0.2, 1.2]); xlabel(‘n’); ylabel(‘x’); title(‘Unit Impulse Signal delta[n]’); Unit Step Sequence u[n] = 1, if n>=0 u[n] = 0, otherwise You can describe it in Matlab like: % Plot an unit impulse signal n = -5:5; x = 0*n; index=find(n>=0); x(index)=1; % plot stem(n, x); axis([-inf, inf, -0.2, 1.2]); xlabel(‘n’); ylabel(‘x’); title(‘Unit Step Signal u[n]’); As you can see step …