[sdiy] What is filter squelch?

[Fiercefish]

Actually the 303 filter does not have a very high Q at all, it can not self oscillate like the moog ladder, the squelchiness is caused by the envelope sweeping (or as is popularly called "spanking") the Q (amongst other things). The thing with the 303 that sets it apart from everthing else is the quirkiness of the design, there are a lot of "flaws" which cause it to behave in certain ways. I love the sound personally, since it is SO different from conventional synth design, hence the reason why it is VERY difficult to emulate the 303 successfully using another synth.
  ----- Original Message ----- 
  From: dustin sedlacek 
  To: harrybissell 
  Cc: Paul Perry ; synth-diy at dropmix.xs4all.nl 
  Sent: Tuesday, September 06, 2005 8:58 AM
  Subject: Re: [sdiy] What is filter squelch?


  i thought that this had something to do with the "Q" of a filter ....  i think ... that the "Q" of the filter on the 303 is higher than then typical moog ladder filter  .... John Blacet  has a filter called the "filthy filter" and it is describes as having a lot of "Q"    http://www.blacet.com/

   ....here is a quote from this page
   http://www.adp-gmbh.ch/csound/filters.html
  "The filter's Q is a measure of the filter's sharpness. As the Q increases, so does the sharpness of the filter. 
  Low pass and high pass filters exhibit a hump for increasing Q around the cut off frequency for increasing Qs. If the Q is even larger, those humps turn into peaks. If the Q is too high, it turns the filter into an oscilator."

   seems like i recal reading that a filters's "Q" had a width but i am not as knowledgeable as others on this list 




  -Dustin








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