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 ?
In a series they survived more than they dominated, the Lakers absorbed one last onslaught and beat down the San Antonio Spurs 93-87 Tuesday night at Staples Center, closing out the conference semifinals four games to one.
As the sun beat down hard on the field, hundreds of owners primped and primed their dogs for the short walk around the ring in front of the judges.
This gives me life,'' Aguilar said as the sun beat down into the quad area, the same spot where he had taken Medina to play as a child.
Droplets of sweat bled from his brow, as the afternoon sun beat down on his forehead.
Otherwise, it was a sluggish, sloppy night as the Lakers beat down their roommates 98-83 for the 15th straight time in this pseudo-rivalry.
He's the guy that the colleges are going to beat down the door for,'' Kidder said.
Liberation commented, "Bally's attempted use of its 'poison pill' - an anti-takeover defense - as a club to beat down shareholders intent on engaging in a legitimate expression of shareholder democracy is brazen and unprecedented.
There's no way Kildare should have done scored 1-6 with reply to beat Down in Newry.
Shoulder tendinitis, illness and a maddening lack of run support have conspired to beat down the erstwhile Padres ace, leaving him with a deflated win total and a bloated ERA.
I saw these dudes get hit straight in the face with a truck, and dude's just lying on the ground bleeding and getting beat down, but the cops ended up coming.