Chapter 2 Discrete-time signals and systems 2.1 Discrete-time signals sequences 2.2 Discrete-time system 2.3 Frequency-domain representation of discrete-time signal and system
1 2.3 Frequency-domain representation of discrete-time signal and system Chapter 2 Discrete-time signals and systems 2.1 Discrete-time signals:sequences 2.2 Discrete-time system
2.1 Discrete-time signals: sequences 2.1.1 Definition 2.1.2 Classification of sequence 2.1.3 Basic sequences 2.1.4 Period of sequence 2. 1.5 Symmetry of sequence 2.1.6 Energy of sequence 2. 1. 7 The basic operations of sequences
2 2.1 Discrete-time signals:sequences 2.1.1 Definition 2.1.2 Classification of sequence 2.1.3 Basic sequences 2.1.4 Period of sequence 2.1.5 Symmetry of sequence 2.1.6 Energy of sequence 2.1.7 The basic operations of sequences
2.1.1 Definition <n<+ Enumerative representation EXAMPLE xn]={1,2,1.2,0,-1,-2,-2.5},-1≤n≤5 xn]=0.9c0s(0.2m+7/2.0≤n<10 Function representation
3 2.1.1 Definition x = x[n] − n + EXAMPLE x[n] ={1,2,1.2,0,−1,−2,−2.5},−1 n 5 Enumerative representation x[n] = 0.9 cos(0.2 n + / 2),0 n 10 n Function representation
0.5 0 -0.5 6 0 10 Graphical representation
4 - 2 0 2 4 6 - 3 - 2 - 1012 0 5 10 - 1 -0.50 0.5 Graphical representation
Generate and plot the sequence in MATLAB n=-1:5 X=[1,2,1,20,-1,-2,2.5] stem(n, x, n=0:9 y=0.9.^n.*cos(0.2*pi*n+pi2) stem(n,y,)
5 n=-1:5 x=[1,2,1.2,0,-1,-2,-2.5] stem(n,x, '.') n=0:9 y=0.9.^n.*cos(0.2*pi*n+pi/2) stem(n,y,'.') Generate and plot the sequence in MATLAB