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 ?
safe in the knowledge that is was probably short-lived and by the time you read this the rain is more than likely beating against your windows.
If he can translate his hurdles form to fences, Evan Williams' gelding is going to take some beating against a fairly unreliable bunch, especially if he's allowed an easy lead in this small field.
Rhydyfelin are the surprise team in fifth spot currently, after a huge beating against Caerphilly boosted their try tally to an incredible 25 with seven competition games still to follow.
The NHS doctor pleaded not guilty at Solihull magistrates court to one charge of common assault by beating against Mr Rizvi, who is a joint director with his father in Foleshill Medical Centre and Alijah Rentals.
The NHS doctor, formerly of Huddesford Drive, Balsall Common, pleaded not guilty at Solihull magistrates court to one charge of common assault by beating against Mr Rizvi, who is a joint director with his father in Foleshill Medical Centre and Alijah Rentals.
It wasn't just a beating against Hopkins, it was a 12-round humiliation.
Brenda, of Witherwack, said: "I was holding him and I could feel his heart beating against mine.
A four-set beating against Nikolay Davydenko in the fourth round has done nothing to dampen his spirits.
I took a big beating against Klitschko, who out-boxed me.
The preferred technique is to switch on the vacuum cleaner with the beater brush at the highest setting and then adjust the brush downward until you hear it start beating against the carpet.
The old house with its antique-filled rooms sits on a cliff overlooking a wild Pacific Ocean, giant waves beating against a tall, jagged spire of granite called Castle Rock.
The Raiders are likewise tipped to have the edge over the Lady Patrollers, who absorbed a 15-25, 12-25, 21-25 beating against Ateneo on opening day.