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 ?
McLaughlin pulled no punches about the outcome after his side were convincingly beaten against the best side in Heineken Cup history - Leinster's second victory in a row, their third in four years to leave them undisputed Kings of European rugby.
We asked a lot of questions when we were beaten against Coventry in our last game but the players have bounced back to beat such a good side who I have such admiration for.
We were well beaten against Arsenal in periods of the game and Sunderland, I'm sure if Emile Heskey stayed on we would have won, so the home form's not been bad.
The boys were beaten against Bournemouth but they will bounce back and we will be as positive as we can be at Aldershot.
I think if we are beaten against this team then panic will start to set in.
So you know the balance of play in many occasions is that he sets up a team not to get beaten against a Liverpool side that if you try to attack, will punish you and win the game.
After making the frame on her first two outings, the mare got off the mark at Huntingdon in December when seeing off the useful Harringay, before being beaten against the boys next time out.