Problem with active noise cancellation function : ...

My nokia 6720 have problem with active noise cancellation function. It seem not working because it also have noise when this function is active. So, I try to disable this function and found that the noise is reduce (but still not clear). How do I correct this problem?
Thanks.
P.S. Firmware version is 012.008

"I must must achive a segnificant attenuation of the noise in a closed volume using some NI devices ..."
At first glance I would say "probably can be done using an FPGA as a target" since the FPGA can close a very fast loop.
But to do that with a microphone input on a PC running Windows...
I suspect that would be an exercise in futility.
Anyone out there been able to turn around a microphone input fast enough to something like this?
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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