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 ?
Plain-clothed 'spotters' patrolled the parkland into Cole Valley, and radioed any illegal biking through to police bikers who then gave pursuit off the beaten track.
Upscale travel website Jetsetter (jetsetter.com) published a list of the world's top 10 islands off the beaten track, reports Reuters (Jan.
The small Estonian island of Muhu was included on the list of top ten islands that are "off the beaten track," compiled by the tourism Web site www.jetsetter.com, reports news agency LETA.
Even though it is next to a busy road, it is a bit off the beaten track."
World tourism cities; developing tourism off the beaten track.
Although a little off the beaten track of downtown Main Street, the Sidecar Restaurant is worth finding.
Foreign Office Minister Meg Munn said: "It's great to get off the beaten track when we're away from home, but things can change very quickly.
People who like to get off the beaten track (many Bradt guides are the first for that destination) and who are interested in knowing a little bit more about the place that they're visiting.
Sample some hydrothermal areas a bit off the beaten track, such as Lone Star Geyser.
Off the Beaten Track: Three Centuries of Women Travellers By Dea Birkett Foreword by Jan Morris National Portrait Gallery Publications, $40
This schoolmasterly approach is not contrasted by a creative graphic designer, nor particularly up-to date or off the beaten track references.
To describe the islands as 'off the beaten track', she adds, is not the sort of overblown tourist-brochure type of claim that you usually need to take with a large pinch of salt.