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Watch
@xiphmont's amazing video on this subject. He dispels all of the typical myths and misconceptions about digital audio with awesome hands-on demos. https://xiph.org/video/vid2.shtml …
Also I should note that the Nyquist theorem requires *excluding* exactly at half the Nyquist frequency. A 20kHz signal sampled at 40kHz is a corner case - the phase and amplitude are ambiguous, and good resampling algorithms will actually *filter out* such a signal.
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So the fact that he's getting *any* output at all, at a nonstandard sample rate like 40kHz, pretty much means he's implicitly using, and relying on, some kind of crappy resampler (probably built in to Java or Windows).
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* I meant exactly at half the sampling frequency (which is the Nyquist frequency).
End of conversation
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