[sdiy] Q-Enhancement with Cascaded Bandpass is Modest

Bernard Arthur Hutchins, Jr bah13 at cornell.edu
Wed Sep 11 04:58:33 CEST 2019

A week ago (Vocoder thread), I said, based on my memory of examining the notion many years ago, that the idea of cascading two identical BP filters to sharpen Q was distressingly slow.

If I wrote this up in the distant past, I can't find it.   Anyone?

I did it again:


and found cascading multiplies the original Q by 1.5537, for all Q.   Did I make a mistake?

Nice-looking bandpass - just not much sharper Q-wise.


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