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Hi, I am new to 6711 DSK. I am using Audio sample code to read/write audio samples to AD535. Every thing works fine when I compile the original code and run it. When I tried to pass the signal through a low pass IIR filter, I get a noise dominated output. I inserted the IIR code in the Process() function in audio sample code. Does any one face similar problem and have a solution? Can any one help me to resolve this issue? I appreciate any suggestion. Thanks Thomas. __________________________________________________

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Hi Chacko If you are using the single sample read/write version, it could be that your code is taking too much time - depending on compiler optimizations etc. This could sound like bursty noise. Also, it may be some overload problem depending on the IIR implementation and the coeff. you use. Again this sounds like noise in some cases. Have you tested it with zeros in the feedback loop so you have no poles to make it unstable? IF you used FP this problem should go away depending on how close your poles are to the unit circle. I had some other problems with the DSK, they mostly went away when I reset the CPU each time before I loaded new code. You should also wait after reset since it takes some time and codecomposer can crash if you click too fast. You have to be a little gentle with the CC. During some crashes, when I was testing audio code, everything seemed to work, but wither there was no audio, or there was some pulsing noise. All these problems were due to crashes of the system.... I am assuming of course that you have no bugs in the code! Hope this helps! J. Chacko Thomas <> wrote:Hi, I am new to 6711 DSK. I am using Audio sample code to read/write audio samples to AD535. Every thing works fine when I compile the original code and run it. When I tried to pass the signal through a low pass IIR filter, I get a noise dominated output. I inserted the IIR code in the Process() function in audio sample code. Does any one face similar problem and have a solution? Can any one help me to resolve this issue? I appreciate any suggestion. Thanks Thomas. _____________________________________

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