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."
Then he battled in vain to save their mum and brother before being beaten back by the flames.
They were beaten back by smoke and firefighters led him to safety.
Neighbours rescued the children -- a boy aged 15 and a 12-year-old girl -- but were beaten back by the intensity of the blaze.
The threats beaten back over the past year include insidious back-door attacks through regulatory reform and budget legislation, and sweeping proposals to directly roll back landmark environmental laws, including the Clean Water Act, the Endangered Species Act, the Superfund Law, and the Clean Air Act.
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. Hussein said five security forces and two pirates died.
A neighbour burst into the burning home in a desperate bid to save the pensioner, named locally as Elva Fairless, but was beaten back by the force of the blaze.
The red squirrel has been bullied and beaten back to a handful of strongholds by the bigger grey squirrel.
Several tried to break in to the flat to pull the woman to safety but were beaten back by the smoke and flames.
"The father tried to go inside the house and tackle the fire, but was beaten back by the heat and flames.
Neighbours tried desperately to get into the house to rescue the people, but were beaten back by choking black smoke and flames