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 ?
I cut my hand some had no glass windows without glass sadden me like empty eyeglass frames windows rain lashed your glass its long hair red and grieving a cigarette hanging from my lips I was singing a song in my head I like the sound of rain more than my voice windows a sea filled your sunny vacancy on the fifth floor a blue-sapphire sea I quietly slipped it on my little finger and kissed it three times with tears in my eyes kissed and put it to my forehead three times windows I got up from the red canopy bed and pressed my child's nose against your steamed-up glass the hot room smelled of my young mother I had measles windows I don't know if it was early morning or maybe midnight I don't know stars entered my room beating against your glass
After an impressive British debut at Wetherby, AURORE D'ESTRUVAL should take plenty of beating against the boys in the Victor Ludorum Juvenile Hurdle (1.
She was awake, and bored, and kept beating against my shoulders with her sticky fists, and pulling my hair.
The dollar took a heavy beating against the yen Thursday in New York, momentarily hitting a two-month low of just below 96 yen, after the European Central Bank's decision to hold its key rate interest steady.
Yesterday Contostavlos was indicted on two charges of common assault against Grace Cochran and Serena Burton and one of assault by beating against David Jenkins, all of which he denied.
Khan took a beating against fearsome puncher Marcos Maidana in December but pulled out the win and shrugged off his chinny reputation in the process.
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.
Malik, 31, of Oliver Street, Coventry, pleaded not guilty to two charges of common assault by beating against Syed and Azmat Rizvi and a further charge of using violence to secure entry into the Balsall Common home.
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.
Brenda, of Witherwack, said: "I was holding him and I could feel his heart beating against mine.
I took a big beating against Klitschko, who out-boxed me.