Beat

From International Dictionary of Marine Aids to Navigation
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urn:mrn:iala:dic:1-1-0350

Oscillation is produced by the superimposition of two oscillations of slightly different frequencies. The amplitude of this oscillation varies periodically with a frequency that is the difference of the frequencies of the two oscillations.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)