Yeah, that was why 'B' was special like that. 'A' was just some random stuff from another source. And the (digital) level meter of the interface was before the point in the pipeline where the sample dropping happened, so it always showed activity.
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Yeah, so the phase of an alias folds around Nyquist *and* gets negated (in the φ=-φ sense, not the 180° shift sense). That's the trick. Notice how 90...180 gets folded into -180...-90. Then when you add both halves together, they cancel out. Remove the 1s delay, and they don't.pic.twitter.com/JpGkBme5Xo
So maybe it's more correct to say that aliasing folds magnitude around Nyquist but *rotates* phase around the Nyquist,0° point.
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And if I haven't completely forgotten my complex math, negating the phase is equivalent to negating the imaginary component of the complex result at a given frequency. This is interesting, it means there's a discontinuity at Nyquist; aliasing isn't "smooth" I guess.
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Very interesting, I never thought about how aliasing affects phase...
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