Hi sorry this question might sound silly but,
a signal $$x[n]=[ 6 \: 4\: 0\: 2]$$ what is $$x[n-2]$$ then?
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Sign up to join this communityHi sorry this question might sound silly but,
a signal $$x[n]=[ 6 \: 4\: 0\: 2]$$ what is $$x[n-2]$$ then?
The problem with representing a discrete time just as a list like: $$x[n]=[6, 4, 0, 2]$$ is that you don't have a time reference.
The first index $n=0$ or the sample in $\textbf{bold}$ or $\underline{\mathrm{underline}}$ is usually taken as the start of the sequence.
For example, $$x[n]=[\mathbf{6}, 4, 0, 2]$$ or $$x[n]=[\underline{6}, 4, 0, 2]$$
So $x[n-2]$ is a delay of two samples, and $x[0]$ now happens two samples later: $$x[n]=[\underline{0}, 0, 6, 4, 0, 2]$$