S 2.2.1 Basic Operations Time-reversal (folding)operation: y[n]=x[-n] Branching operation:Used to provide multiple copies of a sequence x x叫 x n]§2.2.1 Basic Operations • Time-reversal (folding) operation: y[n]=x[-n] • Branching operation: Used to provide multiple copies of a sequence x[n] x[n] x[n]