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: zero phase low pass filter - filtfilt and IFIR
Replies: 9   Last Post: May 15, 2013 4:25 AM

Advanced Search

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

Posts: 51
Registered: 6/9/06
zero phase low pass filter - filtfilt and IFIR
Posted: Sep 12, 2009 3:02 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I'm looking for how to build a zero phase low pass filte. For example:
h = fdesign.lowpass(Fpass, Fstop, Apass, Astop, Fs);
Hd = design(h, 'ifir');
do a good job to easily create a filter operator, that works fine with filter. But there is a big offset when I use the "filter" command.
y = filter(Hd,time-series-data);

"filtfilt" ....
would avoid this offset, but doesn't like this filter operator.
So my question is how, create as easily such a low pass filter operator, accepted by "filtfilt" or how to create otherwise a zero phase low pass filter ?

hans



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.