Hello DSPists,
This is my first post on this list, although I have been reading it for quite
some time, with great interest. I am a CS researcher in an unrelated field, but
fascinated for as long as I can remember by DSP and sound synthesis.
Unfortunately my knowledge is still basic, and now is the first time that I
face real technical difficulties (while implementing this:
http://mqtthiqs.github.io/parasites/). Witness this question:
I have a recursive comb filter, implemented with a simple delay line of size N
and feedback F in [0..1]. If feedback is high and I "ping" it, it decays
exponentially as it should, to give the typical ringing effect. The decay time
D is also proportional to N: if I double N, D is also doubled. My question:
what is the value of F depending on N that will give a constant D. In other
words, how can I "play" my comb filter on a scale à la Karplus-Strong and
retain a constant decay time?
Sorry if this sounds too trivial or if it is not the right place to ask. Don’t
hesitate to redirect me if needed or point me to references, I am eagerly
looking for basic literature.
Thank you in advance,
-m
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