> -----Original Message----- > > Message: 4 > Date: Wed, 07 Nov 2007 12:25:50 -0600 > From: Jon Elson <[EMAIL PROTECTED]> > Subject: Re: [Emc-developers] filters > To: EMC developers <emc-developers@lists.sourceforge.net> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=us-ascii; format=flowed > > Peter G. Vavaroutsos wrote: > > Anders, I put a biquad component in the HAL some time ago. It > is a second > > order IIR filter implemented with the transposed direct form > II. An IIR has > > very low delay compared to a FIR. You can use methods like the bilateral > > transform to convert analog filters to the biquad coefficients. > The module > > uses this method to calc coefficients for simple filter types, > but a biquad > > is very flexible and can be cascaded to make more complex filters. > Do you have any easily digestible references? Here's a pretty good reference for the basics that you can download for free. http://www.dspguide.com/pdfbook.htm > Also, is there > any documentation other than the .comp file itself about how to > configure the coefficients? Man I need to proof read my posts. Here's a cookbook for bilinear transforms of some common analog filters. http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt The .comp will calc the coeffs for notch and low pass filters, which I thought to be the most usefull for EMC. It also supports direct loading of the coeffs for flexibility. > I'm "aware" of DSP, but really haven't done any of it. > > Jon >
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