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Sound waves can diffract around objects, which is why one can still hear someone calling even when hiding behind a tree. [26] Diffraction can also be a concern in some technical applications; it sets a fundamental limit to the resolution of a camera, telescope, or microscope. Other examples of diffraction are considered below.
Acousto-optics is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound (or sound in general) through an ultrasonic grating. A diffraction image showing the acousto-optic effect.
Sonic artifact, in sound and music production, sonic material that is accidental or unwanted, resulting from the editing of another sound. Visual artifact, in imaging, any unwanted visual alteration introduced by the imaging equipment. Compression artifact, in computer graphics, distortion of media by the data compression.
Acoustics is defined by ANSI/ASA S1.1-2013 as "(a) Science of sound, including its production, transmission, and effects, including biological and psychological effects. (b) Those qualities of a room that, together, determine its character with respect to auditory effects."
According to the principle of diffraction, when a wave front passes an obstruction, it spreads out into the shadowed space.A creeping wave in electromagnetism or acoustics is the wave that is diffracted around the shadowed surface of a smooth body such as a sphere.
One of the earliest examples of using sound to represent data is the dosimeter, or Geiger counter. This instrument was designed in 1928 to indicate the amount of radioactivity in a given place ...
Diffusion, in architectural acoustics, is the spreading of sound energy evenly in a given environment. A perfectly diffusive sound space is one in which the reverberation time is the same at any listening position. Most interior spaces are non-diffusive; the reverberation time is considerably different around the room.
The acoustical science of noise barrier design is based upon treating an airway or railway as a line source. [dubious – discuss] The theory is based upon blockage of sound ray travel toward a particular receptor; however, diffraction of sound must be addressed. Sound waves bend (downward) when they pass an edge, such as the apex of a noise ...
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