ANC Simulink Model Error

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Olivia Park
Olivia Park 2020-3-2
评论： Jimmy Lapierre 2024-6-26
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!
  2 个评论
Jay
Jay 2024-6-26
Does anyone have the sample file of "Speedgoat_FXLMS_ANC_model.slx"?
Jimmy Lapierre
Jimmy Lapierre 2024-6-26
I'm not sure if you mean the SLX:
openExample('audio/ActiveNoiseControlWithSimulinkExample')
Or the optional "noise" file (washing machine), which you could generate using one of the washing machine recordings in toolbox\audio\samples

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回答（1 个）

Jimmy Lapierre
Jimmy Lapierre 2020-3-2
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.
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Jimmy Lapierre
Jimmy Lapierre 2020-3-3
Have you tried to uncheck "allow tasks to execute concurrently on target" in Configuration, Solver, down in the Tasking section?
Olivia Park
Olivia Park 2020-3-3
yes, and now it gives me this error:

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