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Altera_Forum
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13 years ago

LMS Algorithm for noise cancelling

Hi! I'm trying to develop an ANC system using the LMS filter. I'm using NIOSII processor and the altera Audio UP IP core. Simulating the algorithm in Matlab, it works very well, but when i code it...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

What do you mean by "can't achieve any result"? Do you mean the noise is not cancelled or do you mean there is no output from the system at all? Have you tried greatly increasing your mu value to see if you are having any affect on the signal at all (even if the system oscillates then at least you know you are doing SOMETHING). It could be a scaling problem, have you tried debug mode and stepping through the code to see if your input data is scaled properly and if your weights are accumulating as they should?