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about Low-Shelf filter coefficient calculation

Question asked by shaoqin on May 4, 2015
Latest reply on May 4, 2015 by shaoqin

QQ图片20150504125944.jpg

alpha = sin(ω0)/2 * sqrt( (A + 1/A)*(1/S - 1) + 2 )


I want to ask this 1 / S, S how to get this

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