Digital Systems
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7 Terms
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Causal system
a system where the output at any time depends only on present and past input values, not future inputs
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Memoryless system
a system where the output at any time is determined solely by the input at that same time
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Time-invariant system
A system that has fixed behaviour and characteristics over time
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Linear system
A system where the input ax_1(t)+ bx_2(t) produces output ay_1(t)+by_2(t)
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δ[n+a]
a unit impulse at -a
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u[n+a]
a unit step function at -a
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Note 
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