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 ?
Several people risked their own lives trying to rescue the family on Saturday morning but were beaten back by flames.
WLA (NYSE:WLA) got beaten back so far that up is the only way out; MRK (NYSE:MRK) looks ready to get back the 30% they lost.
Meanwhile, pro-Gaddafi fighters have beaten back an assault by rebel forces on one of their last bastions in Libya's desert.
Armed forces tried to surround the village of Hul Anod to free the family but were beaten back.
Several tried to break in to the flat to pull the woman to safety but were beaten back by the smoke and flames.
His parents Michael Shotton and Diane Curry both tried desperately to reach their son but were beaten back by choking smoke.
Michelle, 47 - who plays witch Lamia in the new Hollywood blockbuster - was beaten back to her trailer by the rain on her first day on set at Kinlochewe in Wester Ross.
Now, the same players, with the same arrogant attitudes toward our money, can't even be beaten back by using fiscal crisis as an honest excuse.
Mr Power, 27, who moved to England from Kilkenny two years ago, revealed how he tried to grab the hand of one of the children - but was beaten back by smoke.
Neighbours tried desperately to get into the house to rescue the people, but were beaten back by choking black smoke and flames
At first they were beaten back by smoke and flames, but fought their way back up the stairs to rescue the little boy.
They were sleeping downstairs when the fire broke out in the early hours of Saturday morning and made desperate attempts to reach their family but were beaten back by the flames.