- The BiQuad Allpass Section
- Show that every second-order filter having transfer function
- Find the
*zeros*of the filter as a function of the poles. In other words, given two poles, what is the rule for placing the zeros in order to obtain an allpass filter? - Find the phase response of the zeros in terms of the phase response of the poles.

- Show that every second-order filter having transfer function

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Center for Computer Research in Music and Acoustics (CCRMA), Stanford University