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Questions on Implementation of IIR filter on the ADSP21369 Ezkit

Question asked by jmcgill on Jul 16, 2013
Latest reply on Jul 29, 2013 by MaheshN

Hello all,

 

I am attempting to implement an iir filter, y[n]-0.25y[n-2]= x[n]+x[n-2], using the iir function in the filter.h file. I am getting nulls at the correct frequencies and see the correct trend of the filter, however the gain all other frequencies is significantly far from what I simulate/calculate it to be. I have tried other irr filters equations and get the same issue with gain... Does anyone have advice or can see an error in my implementation.

 

Thanks for any help,

John

 

The attachment is the c file for processing the block of code.

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