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|Last Updated on Thursday, 19 April 2012 13:27|
The rate of repetition of the CYCLEs of a PERIODIC quantity, such as a SOUND WAVE. Thus, frequency is the inverse of the PERIOD. More generally, frequency can be thought of as the rate of change of PHASE.
(Greek: stereos = solid; phone = sound) Generally, a term used to refer to the spatial distribution of sound, normally using AUDIO technology. More specifically, a form of reproduction which records, transmits and reproduces the original sound with two CHANNELs, regardless of the number of loudspeakers used. Also abbreviated to stereo.
The use of reflected SOUND WAVEs for obtaining environmental information. Certain animals, such as the bat and the porpoise, emit pulses of extremely high frequency sound (up to 50 kHz for bats, and up to 170 kHz for porpoises and whales) in narrow, intense streams. The REFLECTION, or ECHO, of these sounds supplies information regarding the nature and location of objects in the environment. When an emission of varying frequency is used, such as with bats, the echoes, travelling varying distances to the ear, are heard as different frequencies in each ear, thus supplying directional information.
Reverberation is a result of multiple REFLECTIONs. A SOUND WAVE in an enclosed or semi-enclosed environment will be broken up as it is bounced back and forth among the reflecting surfaces. Reverberation is, in effect, a multiplicity of ECHOes whose speed of repetition is too quick for them to be perceived as separate from one another. W.C. Sabine established the official period of reverberation as the time required by a sound in a space to decrease to one-millionth of its original strength.