Article View: sci.electronics
Article #1438Re: State Variable Filters
From: Mark Freeman
Date: Fri, 08 Sep 1989 17:50
Date: Fri, 08 Sep 1989 17:50
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In article <17660018@hpfcdj.HP.COM>, myers@hpfcdj.HP.COM (Bob Myers) writes: > >works but WHY is it called a 'state variable' / 'biquad' filter??? > > a biquadratic transfer function, but I'm not certain how "state variable" > got hung on this particular circuit. (There is at least one other three-amp I believe the term "State Variable" is applied to this circuit, because the terms of the State Coefficient Matrix apply directly to the amplifier transfer functions. Thus, you can go back and forth between the matrix representation and the circuit readily. Take this explanation with a grain of salt, as it comes from someone who has worked on software and digital hardware for the last 10 years. -- Mark S. Freeman Applied Microsystems Corp. markf@amc.com amc-gw!markf
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!brutus.cs.uiuc.edu!ginosko!uunet!pilchuck!amc-gw!markf From: markf@amc-gw.UUCP (Mark Freeman) Newsgroups: sci.electronics Subject: Re: State Variable Filters Summary: Why this is called a State Variable Filter Message-ID: <820@amc-gw.UUCP> Date: 8 Sep 89 17:50:06 GMT References: <2376@radio.oakhill.UUCP> <17660018@hpfcdj.HP.COM> Organization: Applied Microsystems Corp.; Redmond, WA Lines: 18