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Original System: h[n], h(t); Reverse System: h1[n], h1(t)
Then h[n]*h1[n]= [n] or h(t)*h1(t)= (t) 2.3.6 Causality for LTI Systems Discrete-time system satisfy the condition: h[n]=0 for n<0 Continuous-time system satisfy the condition: h(t)=0 for t<0
Solution:
Let x1(t) be an arbitrary input to this system, the corresponding output is y1(t)=sin[x1(t)]
Let x2(t) =x1(t-t0), then y2(t)=sin[x2(t)]=sin[x1(t-t0)]=y1(t-t0). So, the system is time invariant.
k 0
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C. Relation Between Unit Impulse and Unit Step D. Properties of (t)
du (t ) (t ) , u (t ) dt
t
( )d
(1) Sampling property:
(2) (t) is a even function:
1
1
2
Solution:
0
t
0
t
When t<0: y(t)=0 When 0<t<2:
h(t ) h(t )