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ANC Simulink Model Error

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Olivia Park
Olivia Park on 2 Mar 2020
Commented: Olivia Park on 3 Mar 2020
Hi all,
I'm trying to adapt the ANC example from MathWorks (https://www.mathworks.com/videos/active-noise-control-from-modeling-to-real-time-prototyping-1561451814853.html) but using National Instrument DAQs instead of the speedgoat one. here is my modified model:
i keep getting an error at the path estimation boxes:
saying that there's a mistmatch. I see that there's a mismatch, but the "51200x1" error mic signal is coming directly from the NI DAQmx input from a microphone, and I cannot make the block sizes less than 83.... is there a way I can fix this?
thank you!

Answers (1)

Jimmy Lapierre
Jimmy Lapierre on 2 Mar 2020
Hi Olivia, it sounds like your device is incapable of ultra-low latency operation. Unless the noise to cancel is steady-state and exclusively tonal, the total latency time of the system has to be faster than the speed of sound between the error microphone and the loudspeaker.
The example here uses the Speedgoat since its latency can be as low as approximately 2 samples. If you intend to develop ANC for something physically small like headphones, you will need that ultra-low latency (and probably increase the sample rate of the model to further reduce latency).
So you could add buffering to the error microphone in the model to make it execute, but the ANC performance will be severly limited if the latency is too long.
  4 Comments
Olivia Park
Olivia Park on 3 Mar 2020
yes, and now it gives me this error:

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