Jon- > > I'm curious .. what do use the 'biquad filters' for? I assume you mean > > that you've > > implemented a 4th order IIR filter? If so that would mean somewhat > > non-linear phase > > depending on the IIR design type. What type are you using? Elliptic? > > Other? > > The pair of cascaded biquadratic filters form an optimal cantilever > controller. > Our experiment software calculates the controller transfer function, a ratio > of polynomials with four numerator and four denominator coeffcients (floating > point), using the methods described in the papers linked to our page at > "Cantilever controller design is discussed _here_ ..." > Our software refactors and scales that transfer function into two biquad > filter > stages with 24-bit integer coefficients. So I guess the filter type is > "other". Some phase compensation is included in the transfer function, > as described in the papers.
Ok thanks. A fascinating use of the USRP hardware. -Jeff _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
