I was listening to a piece on Inside Science yesterday, and they were
speeding up and slowing down animal sounds. When they played one at normal
speed it seemed to me it had a kind of beat effect that would not be heard
in a real bird. Indeed when they slowed it down it was even more obvious.
Nobody commented on that at thetime, but it reminded me of the old days of
biaoscillators that were less than clean beating with the audio being
recorded even though they were outside the ears passband.
Brian

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