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Hi members I am new to multirate dsp ,I understand that to down sample you need to have antialias filter bandlimited to Fs/2(Fs output sampling rate)and take the M (decimation factor)samples and discard M-1 samples. My questions are 1)Is antialias filter itself called decimation filter 2) delay in FIR filter is given as (N-1)/2 (N. no of taps) ,what is the formula if I decimate by factor M, and Is this formula is applicable to all kinds of FIR filter (I mean symmetric,antisymmetric ,linear phase etc) 3) If I decimate by two stages by M1,M2 factors ,How to calculate FIR Filter delay Thanks in advance Regards klus______________________________