[sdiy] Q-Enhancement with Cascaded Bandpass is Modest

[Bernard Arthur Hutchins, Jr]

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:

http://electronotes.netfirms.com/ENWN58.pdf

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.

Bernie



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