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module TWEETS KEVIN}
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A pre-recorded or simulated sound produced for a radio, television, film or theatrical program in order to suggest an actual sonic environment. The design of such sounds (often abbreviated as SFX), particularly when a complex acoustic environment is to be simulated, involves a thorough understanding of the structure of such a SOUNDSCAPE; that is, what sounds are representative and most significant, as well as which are necessary to create a given AMBIENCE and sense of ACOUSTIC SPACE.
The atmosphere exerts pressure on all objects in it. When a vibrating body moves in air, it creates slight disturbances of the AMBIENT atmospheric pressure. The AMPLITUDE of these pressure variations is called the sound pressure variation, whereas the effective pressure variation is 0.707 the maximum value. The oscillating variations in sound pressure (called the WAVEFORM of the sound) PROPAGATE in the form of a SOUND WAVE.
The most commonly used medium for recording sound. It is manufactured in various widths (1/4, 1/2 and one inch primarily) and thicknesses (3.0, 1.5, 1 and .5 mil where 1 mil = 1/1000 inch) for different purposes, which now include video and digital recording.
(German: artificial head). A STEREOPHONIC recording system developed in Germany which employs an artificial head sitting on a resonator similar to a chest cavity. The recording MICROPHONEs are situated within the head, inside an anatomically correct ear canal, at the point where the human eardrum is located. Artificial PINNAE are carefully designed for accurate reflection of the incoming sound in order to achieve the good front-back and height-depth perspective for which the technique is noted.