[sdiy] Filters

[Jay Schwichtenberg]

JB,

With the Steiner filter adding VC Q may not be as trivial as other filters.
Just depends on how you want it to operate. With most filters you just
control the amount of feedback. With the Steiner filter you are doing this
by controlling the filter output amplitude. If you look at the original
paper from Nyle Steiner you see ~30db amplitude change when changing the Q.
This is a fairly considerable change in output so you may want to put some
sort of compensation on the output to adjust the output according to the Q.

You can find the original paper at:

http://www-timc.imag.fr/Yves.Usson/personnel/SDIY/archives/

Happy filtering.
Jay
  -----Original Message-----
  From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of jbv
  Sent: Friday, January 02, 2004 4:11 AM
  To: synth-diy at dropmix.xs4all.nl
  Subject: Re: [sdiy] Filters


  Hi, and Happy New Year to everyone,
  Is there a (easy) way to modify this VC-BPF design :
  http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html
  to add VC-Q to it ?

  Or to modify this one :
  http://www.cgs.synth.net/modules/cgs30_bpf.html
  to have VC-F and VC-Q ?

  Thanks,
  JB

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