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I do the probably common demonstration in which a large lighted laboratory
gas burner, e.g. Fisher burner, is placed on the floor and a long cardboard
carpet roll tube is lowered over it until a very loud low pitched sound is
produced.
Is it true that even though this clearly IS a hissing source,
there is more going on than "a resonant filter applied to a broadband noise
source"
Is this "mode locking"?