Investigations of aliasing effects in digital waveform sampling will show the existence of a
pseudo-alias domain lying to the left of a "Nyquist line" in a plane defining the boundary between two
domains of sampling. To the right of the line lies the classic alias domain. We discuss a problem
with some band-limited signals below the Nyquist limit, when displayed output can also show a false
modulation envelope whenever the sample rate and the signal frequency are related by ratios of
mutually prime integers. An improved definition of the Nyquist frequency is proposed.
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