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Sounds like "beating" - two frequencies close together - the frequency of the beat is the difference in frequencies of the two original frequencies. This is the basis of tuning a musical instrument.
2s period corresponds to a 0.5Hz difference between say the compressor motor and the fan motor (or whatever the sources are).
Al.
Last edited by sheeny; 09-05-2023 at 09:07 AM.
Reason: typo
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