Date: Apr 9, 2013 11:40 AM
Author: fl
Subject: Why is the number of decimation FIR filter states different with that<br> of number of numerator?

I design a decimation low pass filter (decimation 16). It is an FIR, low pass 16 Hz, stop frequency is 50 Hz, sampling rate is 10000 Hz. I use filterbuidler design this filter. To my surprise, when I click the mfilt.firdecim variable, it shows:

FilterStructure: Direct-Form FIR Polyphase Decimator
Numerator: [1X582 double array]
State: [576X1 double array]

How to explain the difference between Numerator and State?