8 Mar
2020
8 Mar
'20
6:24 p.m.
- Peter P. peterparker@fastmail.com [2020-03-08 18:21]:
- Miller Puckette via Pd-list pd-list@lists.iem.at [2020-03-04 16:49]:
vcf~ aims for an approximate peak gain of 1 (although this is _very_ approximate for low values of Q).
Thanks for the info Miller!
Measuring vcf~ with a Q of 5 and noise~ I do get different results depending on the center frequency. For 100Hz the filter output is 26dBRMS softer than its input signal, at 1000Hz it is 16dBRMS softer, and at 10000Hz it is 5dB softer. Raising the Q to 15 softenes all three levels accordingly.
I am attaching the patch I measured this with plus a small sqrt(f/Q) calculation therein.