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Issue getting simple biquad working

Question asked by dsp-fx on Jan 11, 2018
Latest reply on Feb 11, 2018 by Kader.M

Hi - I am currently working on the '21469 EZ-Board - based on research and some other postings, I have modified the example projects "AD1939_Block_Based_Talkthru_192kHz" to try and get a simple HPF working. After many hours of "aha that must be it" I still am getting 0 output from the filter.

 

The system also seems to be unstable - even with an unmodified project, at times when starting up the board the audio is distorted (hear lots of intermod distortion)... If I pull power on board and restart CCES then things seem to work again, then it devolves after a couple re-loads.

 

I am attaching project - I need another set of eyes on this - or can ADI provide a working example project?

 

Also curious about EZ-Board stability issues - have other people seen this? We have two boards at two sites that seem to do the same thing...

 

Thanks in advance for any help on this.

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