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Re: [Discuss-gnuradio] FIR filter design function
From: |
Matt Ettus |
Subject: |
Re: [Discuss-gnuradio] FIR filter design function |
Date: |
Mon, 03 Sep 2007 11:03:14 -0700 |
User-agent: |
Thunderbird 2.0.0.0 (X11/20070326) |
Dominik Auras wrote:
> Hi!
>
> If I design filters, what gnuradio module do I prefer:
> - optfir
> - gr.firdes
> ?
>
> It seems to me that you use gr.firdes in newer code, but optfir allows
> me to specify more filter parameters.
>
firdes creates windowed filters, and is always guaranteed to give you a
working filter. optfir uses the Parks-McClellan algorithm, and can
produce better filters. However, if you ask too much of it, it will
fail, since the algorithm is not guaranteed to converge.
Matt