Comment 2 for bug 997902

Cool -- I want to try it out first and take a look at some waveforms
side-by-side but the patch looks good. As a side-note/TODO there is code in
src/waveform/waveform.cpp that records the filter frequencies in the
waveform protobuf when we save it to disk. I'm not sure what the bessel
frequencies are ... there are some comments that suggest 600Hz-4000Hz as
the bandpass region but I'm not sure how accurate those are. Whatever they
are the cutoffs need to be updated there.

On Fri, May 11, 2012 at 10:07 AM, Owen Williams <email address hidden> wrote:

> My patch uses 4th and 8th order IIr filters and the results look good.
> Trying the even-cheaper second-order filters resulted in gross spiky
> artifacts. I would propose my patch as-is for the fix unless someone
> knows of another option.
>
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> https://bugs.launchpad.net/bugs/997902
>
> Title:
> Use cheaper filters in waveform analyser
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