Hi Guys, Something I've had on the backburner for a while, but now I've finished my new product I've had time to finish.
I've seen in many Sallen Key circuits people stick the input signal into various points to generate some different responses, but always the high pass is only 1 pole. A while back I came up with a version that can also generate a 2 pole high pass, in fact it can generate all the shapes you can by mixing the outputs of an SVF, including notch and peaking or any other summation. Like I did with the SVF some time ago I've also worked out the coefficients for the SKF using Sin only and put it in state increment form. Thanks again to Teemu for pointing out the sin(w) and sin(2*w) sine / cosine generator form as being very low noise and having high accuracy on a KVR thread on efficient sine generation. Like I did a while back with the SVF I've also calculated the DF1 coefficient to SKF with mix parameters which turn out to be identical to the SVF anyway. https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf and all the other papers (including the SVF version of the same thing I did a while back) are always available here: www.cytomic.com/techincal-papers All the best, Andy -- cytomic -- sound music software -- -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
