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Re: [Discuss-gnuradio] Filter in rational resampler

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Filter in rational resampler
Date: Wed, 30 Jul 2014 12:43:59 -0400
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On 07/30/2014 12:42 PM, Daniele Nicolodi wrote:

I was studying the code of the rational resampler block in
gnuradio/gr-filter/pythoin/rational_resampler.py and I have a doubt
about the low pass filter generated by the design_filter() function.

It seems that the generated filter does not take into account the
decimation factor. Is that correct? I don't see how this may result in
the correct anti-aliasing filter when it is applied by

Can someone point me to a relevant explanation?

Thanks a lot. Cheers,

Discuss-gnuradio mailing list

The filtering happens *before* resampling. It has to, or you end up with aliases.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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