Maybe this will help? Use four biquads, each set to the same frequency, but with Q set as indicated by the calculator:
http://www.earlevel.com/main/2016/09/29/cascading-filters/ Nigel > On Dec 23, 2016, at 8:59 PM, Waverly Edwards <[email protected]> wrote: > > I need to apply an eight-pole Butterworth low-pass and later a high-pass > filter. Are there any built-in mechanisms for this? > If there are not, would someone mind providing some algorithmic guidance as > to how this could accomplished? Why? I am attempting to reproduce an > experiment in which an eight-pole Butterworth filter was used -- a high-pass > at 300Hz and a low-pass at 3000Hz. If it matters, this is not for iOS. > > Thank you kindly, > > > W. > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/earlevel%40earlevel.com > > This email sent to [email protected]
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