S 2.2.1 Basic Operations Time-shifting operation,where N is an integer If N>0,it is delaying operation -Unit delay xin] y[n]=x[n-1] If N<0,it is an advance operation -Unit advance x[n]- 一y[n y[]=x[n+1]§2.2.1 Basic Operations • Time-shifting operation, where N is an integer • If N > 0, it is delaying operation −1 x[n] z y[n] –Unit delay y[n]=x[n-1] x[n] z y[n] -Unit advance y[n]=x[n+1] If N < 0, it is an advance operation