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 ?
Ronaldo will be on his usual right-wing beat against Benfica as Ferguson, who watched them in the Lisbon derby against Sporting on Friday, tries to second-guess how they will approach the game.
As the waves beat against the boat and the disciples got anxious they asked for His help.
The hardback specials see the plucky French warrior continuing to beat against the might of ancient Rome by introducing the Brits to the magic potion that turns ordinary mortals into super-heroes.
He added: "I have won it before, I played in two semi-finals before, the first for East Belfast when we got beat against Dundela and then the following year, when I moved to the Glens, I won it with the Glens seconds against Cliftonville Olympic.
A reproduction of these performances will make the hosts tough to beat against seemingly weaker opposition, but given the situation it is likely to be a very close game.
Scotland's largest city was in the grip of two days of gale-force winds and bitingly cold rain, and, as I watched fierce torrents beat against my hotel window, the morning news informed me it was also be the day of the country's biggest football derby - Celtic vs Rangers.
At the end of another confusing week at Tynecastle, Hartley expects to return to a more familiar beat against Falkirk tomorrow.
Rangers have two cups but it's the league championship they really want, so they have to make themselves a hard team to beat against us.
Former Hull man Turner said: "It was important we didn't get beat against Villa, because they are just a few points ahead of us.