beat

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beat

1. Physics the low regular frequency produced by combining two sounds or electrical signals that have similar frequencies
2. Prosody the accent, stress, or ictus in a metrical foot
3. Nautical a course that steers a sailing vessel as close as possible to the direction from which the wind is blowing
4. 
a. the act of scouring for game by beating
b. the organized scouring of a particular woodland so as to rouse the game in it
c. the woodland where game is so roused
5. Fencing a sharp tap with one's blade on an opponent's blade to deflect it

Beat

A variation in the intensity of a composite wave which is formed from two distinct waves with different frequencies. Beats were first observed in sound waves, such as those produced by two tuning forks with different frequencies. Beats also can be produced by other waves. They can occur in the motion of two pendulums of different lengths and have been observed among the different-frequency phonons in a crystal lattice.

One important application of beat phenomena is to use one object with an accurately known frequency to determine the unknown frequency of another such object. The beat-frequency or heterodyne oscillator also operates by producing beats from two frequencies.

beat

[bēt]
(physics)
The periodic variation in amplitude of a wave that is the superposition of two simple harmonic waves of different frequencies.

beat

i. A low-frequency vibration produced when two sources of vibration act on the same object at the same time. For example, in a multiengine airplane, if two engines have slightly different RPM, airframe vibrations produced by these engines will produce a very noticeable beat.
ii. When two waves are combined or superimposed, a beat occurs if two frequencies are not the same. Waves beat together to create the appearance of either a change in amplitude, if the frequencies differ by a few hertz (Hz), or new frequencies, called beat frequencies or heterodynes, if the original frequencies are far apart.
References in periodicals archive ?
The win was a dramatic turnaround for the Bruins, who trailed by 17 points late in the first half, and looked lost offensively and beaten down defensively.
After a year like 2004, many IT departments feel beaten down from combating viruses like Mydoom and Netsky," said Stuart McIrvine, director of IBM's security strategy.
Seabiscuit, which was out of the West, was seen as the horse of the people - those who had been kicked and beaten down by the Depression but were fighting back - against the seemingly unbeatable and much larger War Admiral, which seemed to represent the establishment.
Beaten down by the cruelty and isolation of her loveless marriage, Johanna seeks refuge with her mother, vowing never to return to Fulk.
CHICAGO -- Gregory Spear, editor of Spear's Security Industry Analyst, believes the January Effect could help some beaten down technology names.
A lot of these stocks were beaten down but showed good relative strength over the last year and many of them have broken out,'' he said.
One sector that has been badly beaten down but should benefit in a falling crude oil environment is the airline industry.
Bill and Matt bought KOMG in early May and the holding is part of their ``mini-basket buy'' of beaten down cyclical tech stocks with attractive operating fundamentals and ``smart'' insider buying that includes ON Semiconductor (NASDAQ:ONNN) and Amkor (NASDAQ:AMKR).