Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: Why is the number of decimation FIR filter states different with that
of number of numerator?

Replies: 1   Last Post: Apr 10, 2013 2:45 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
fl

Posts: 82
Registered: 10/8/05
Why is the number of decimation FIR filter states different with that
of number of numerator?

Posted: Apr 9, 2013 11:40 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Hi,
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?

Thanks,




Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.