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Fixup use of stage parameter in filter_calc_factors #19

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justinzane opened this Issue Apr 5, 2013 · 0 comments

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@justinzane
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  1. In the comment above filter_calc_factors, the "stage" parameter is incorrectly referred to as "start". However, actually it is unused, and please be assured that the Q factor is the same for both stages of the LR4 crossover and for your use case. The use case when it is not the same is, say, when you are trying to build a 4th order Butterworth filter from two biquads - but this is not our use case, we both need a cascade of two 2nd order Butterworth filters, not a 4th order Butterworth filter.

NOTE: The code has been changed since submission to include the table of quality factors from Dr. Linkwitz' website. Though this is not necessarily relevant to the immediate use case, considering Tanu's suggestion that the biquad code be moved into pulsecore, it seems potentially useful.

@justinzane justinzane was assigned Apr 5, 2013
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