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How do I creat my double precision filter?

Question asked by cadie on Jun 24, 2013
Latest reply on Jun 26, 2013 by ColemanR



I am working on a audio project with ADAU1701, that need adjust filter parameters at runtime, and my parameters is calculated by ADAU1701 itself, so I cann't use double precision IIR filter provided by sigmastudio, I must creat a IIR filter with multiply and add module by myself, 

it seem that the calcutate result of multiply or add is signal precision, then how do I creat my double precision filter?