Operations on signals -Time reversal

Time Reversal

The time reversal of a signal x(n) is obtained by folding the sequence about n=0. It is denoted as x(-n).
if x(n)={2,1,2,1} (first one is n=0 if not arrow marked(bold) explicitly)

Now let us see some combination of time reversal and shifting
x(-n-2) is x(n) time reversed and advanced 2 units of time. ie. {1,2,1,2,0,0}
x(-n+2) is x(n) time reversed and delayed 2 units of time. ie {1,2,1,2}

It is good to draw graphical representation of these signals yourselves.

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