beat frequency

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beat frequency

[′bēt ‚frē·kwən·sē]
(electronics)
The frequency of a signal equal to the difference in frequencies of two signals which produce the signal when they are combined in a nonlinear circuit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

beat frequency

beat frequencyclick for a larger image
The periodic variation in amplitude of an oscillation resulting from the superimposition (or mixing) of two oscillations of differing frequencies. It is equal to the difference between the two frequencies.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved