A single sound of definite, recognizable PITCH. It also refers to the SONORITY or the quality of TIMBRE of a particular sound or sounding instrument. In British musical usage the word is also employed to refer to the INTERVAL of a major SECOND.
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.
In the perception of ACOUSTIC SPACE, projicience refers to the sense of depth of a sound in the space.
(Greek: akouein = to hear) Commonly, the study of SOUND and its behaviour in various media and environments, including the effects of ABSORPTION, DIFFRACTION, INTERFERENCE, REFLECTION, and REFRACTION.