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 ?
Llanrumney Utd scored a last-innings 26-1 to win at Caerau and in Division 3 St Joseph's B beat off Newport club Duffryn.
The firm beat off competition from magic circle giant Linklaters to land the Best Graduate Recruitment Campaign.
He said: "They beat off hundreds of films to get to the last three which were by people much older than themselves - it was a tremendous achievement.
The 10-mile race to the top of Britain's highest summit -4409 feet -and back again attracts a strong entry from over the border and last year Bingley's Andy Peace beat off a 500-strong field for victory.
Richard Hier beat off 6,000 entrants to make it to the last 12 in the Men's Health cover model finals in London.
A 26-year-old CIMA member beat off competition from across the UK by demonstrating an impressive combination of technical and commercial skills and wide-ranging external interests
Her heroes often find themselves scavenging on the margins of society: Transients like the ever-present panhandlers - some wily, some industrious, some pathetically desperate - discover ways to battle daily indignities with laughter and small acts of kindness; friends like Nan, "holed up in high-rise hell" and fighting poverty and diabetes, beat back the lure of suicide by simply sharing a conversation with a friend; and strangers like an unknown woman, falling to her death from the Barham overpass, realize they are unable to beat off the lure of suicide "in a metropolis gone mad, where the only politics is survival and success is measured in multiples of zeroes.
This is especially good news for Primagraphics as it is the first time we have worked with Elbit and it is particularly pleasing as we beat off some stiff competition to secure the contract.
The pounds 675m centre - which opened to the public last October - beat off competition from other shortlisted centres in Portugal and Singapore to take the award.
The WRU beat off an Irish bid from the new Aviva Stadium - the redeveloped Lansdowne Road - to host the 2011 showpiece.
Del Potro beat off stiff competition to win the Olimpia de Oro award, including Messi who helped Barca to a clean sweep of all six trophies they could have lifted this year.
The Welsh Highland Railway at Porthmadog beat off stiff competition from old rivals Chirk to win the railway station category for 2008.