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Problem with iirdf1_fr32 library function

Question asked by Krishnamangegowda on Apr 14, 2015
Latest reply on Jun 18, 2015 by SachinV


I am using ADSP- BF524 Blackfin Family Compiled Simulator to test the filters.

We have low pass elliptic filter designed in Matlab with cutoff frequency of 4kHz, 48kHz Sampling frequency. We have tested for stability

with 32 bit fixed point, it looks fine. I am testing the filter using the library function iirdf1_fr32, when I test the filter with full scale sine sweep, it gets into some kind of toggling state, don not understand why? It seems to be working fine if I lower the input by 2dB but would like to understand why it doesn't work with full scale sine sweep.


I am attaching the complete project, please have a look into it asap.


Waiting for your response.