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ADAU1701 General (2nd order/lookup) filter block sending two sets of parameters?

Question asked by joe42 on Jan 22, 2015
Latest reply on Jan 23, 2015 by mmmike

I notice that when changing the frequency value in one of these filter blocks, SigmaStudio sends two sets of parameters to the DSP; the old, then the new, to the same address.  What is the purpose of sending the old coefficients before new?  This seems to happen on every kind of filter.

 

When implementing this in a microcontroller, we care about those several hundred extra bytes used up.. Do I need to bother mimicking the behavior of SigmaStudio, or can I just send the new coefficients?

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