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calculate the normalized angular frequencies

The normalized angular frequency for $x_1[n]$ is $2\pi3.5/64$. $n$ is the sampling index so would not be included in the angular frequency. The units of normalized angular frequency are radians/sample,...
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Proof-of-concept for active noise cancellation to block consistent low-frequency HVAC noise transmission

Very similar situation here. What kind of brown noise did you use? I'd love to try a similar approach, and kill (or at least mask) this noise
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