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 best way to detect it is to check your pulse; we all get occasional extra beats but if the rate is consistently irregular, see your GP.
During book signings, he'll pause a few extra beats before scrawling your message, often with an elaborate drawing to boot (in my copy of Naked, Sedaris drew a Jollibee burger, which he'd sampled that afternoon the inscription read: "To Scott ndash A Champ").
On admission he was afebrile, Pulse was 82/min with occasional extra beats. BP 116/80 mmHg.
Nonetheless, the American College of Cardiology/American Heart Association guidelines on the management of PVCs state that if a patients history is consistent with premature extra beats, potential exacerbating factors such as caffeine, alcohol and nicotine should be eliminated.
They struggle decoding RI carols they've already heard, presumably because their bodies sense that all those extra beats are superfluous.
At once angular and fluid, she moved with incomprehensible speed and lightness; her pas battus (steps made with extra beats of the foot) and the tiny twist of her fingers as she extended her arms were as delicate and organic as the flick of a cat's whiskers.
"One explanation for the findings in this study is that patients sense palpitations because of precursor rhythms that can evolve into AF, such as extra beats or short episodes of arrhythmias," he says.
The extra beats usually begin in the pulmonary veins that drain the blood into the top left side of the heart.
And no one, least of all a dying heart attack victim, is going to quibble over three extra beats.
Q: I have been having a feeling of skipped or extra beats and some pounding feelings for quite a while now.
But updating an opera focuses attention on the staging, and this one needed a few extra beats of planning to work out the kinks.