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Second-order IIR Filters will support cascade implementations - 5 Part digital audio application tutorial

Audio filter Design - Part 1 of a tutorial on Second-order IIR Filters
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ThijsW
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re: Second-order IIR Filters will support cascade implementations - 5 Part digital audio application tutorial
ThijsW   3/3/2010 1:05:34 PM
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it seems that a3 should be: wc^3-2*k*wc^2+2*k^2*wc- k^3 instead of: 3*wc^3-2*k*wc^2+2*k^2*wc-3*k^3

ThijsW
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re: Second-order IIR Filters will support cascade implementations - 5 Part digital audio application tutorial
ThijsW   3/2/2010 2:15:33 PM
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I also cannot reproduce the equations from eq 22. When i calculate Hh(z) * Hh(z), I get: a1 = (2*wc^2-2*k^2) / (wc^2+2*k*wc+k^2) Which differs in a sqrt(2) factor. My results for the 3rd order butterworth filter also differ

vejl
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re: Second-order IIR Filters will support cascade implementations - 5 Part digital audio application tutorial
vejl   3/3/2009 9:51:56 AM
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There is an error in 3.order filter equation 24. a3 contains a fault. When applying values like in table 12 the calculated value is different.

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