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 ?
Beating the Bounds began in 1346 with the presentation of a Royal Charter creating the Freemen of the town, and every seven years thousands walk the seven-mile boundary of the ancient borough of Llantrisant.
Organised by Llantrisant Town Trust, which manages the rights of the Freemen in partnership with Rhondda Cynon Taf council, Beating the Bounds takes place on June 12.
The Beating the Bounds ceremony takes place in Llantrisant every seven years and in the past has attracted as many as 20,000 spectators.
While Sir Albany waited with the banquet in the castle hall, the wedding party undertook the custom of riding out and beating the bounds, so the story goes.
Mae Portreeve's Breakfast yn dilyn hen arferiad arall yn y bwrdeistref, sef archwilio'r ffiniau, neu Beating the Bounds, lle bydd torf yn cerdded o gwmpas hen ffiniau'r dref yn eu hawlio unwaith eto i Dalacharn.
The board has agreed to fund the following events: Dickensian Christmas Market, pounds 3,000; Lowick Beating the Bounds, pounds 120; EU Friendship Festival, pounds 800; Seahouses Sea Shanty Festival, pounds 2,000; Charity Diners' Workshop and Concert, pounds 1,000; Berwick Tattoo Lighting contribution, pounds 6,500 and Norham Scarecrows, pounds 1,500.