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An OSCILLATION produced in an object which resonates at the same FREQUENCY, or a HARMONIC multiple thereof, as that present in a sound wave in contact with the object.
An adjective describing any process involving the transfer of a SIGNAL from acoustic to electrical form, or vice versa. Most commonly, TRANSDUCERs such as the MICROPHONE or LOUDSPEAKER are examples of this process.
Sound at frequencies above the audible range, namely above 20 kHz, audible only to various non-human species. Because of its very short WAVELENGTH in the megahertz range, ultrasound is used as a safe alternative to X-ray photography in medical diagnosis. Ultrasound scanning is sometimes called sonography.
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.