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This is dealt with by smoothing the spectrum in a way to preserves the power density. The constructive and destructive interference then cancel each other out.

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What does "smoothing the spectrum" mean? What operations are being performed?

I'd guess: Fourier transform, a power density preserving blur convolution, then inverse Fourier transform.

But I am not familiar with the field of signal processing.

That's my guess too but my hunch is that would sound like absolute crap. Intentional IMD. Something to experiment with.

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