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Determine whether the following systems are causal or non-causal.y(n)=x(n)+1x(n1)
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Solution:

Given: output of the system y(n)=x(n)+1x(n1)

For n=1;y(1)=x(1)+1x(2)

For n=0;y(0)=x(0)+1x(1)

For n=1;y(1)=x(1)+1x(0)

For all values of ‘n’, the output depends on present and past inputs. Therefore, the system is causal.

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