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Acoustics is a branch of physics that studies mechanical waves in different media, such as vibration, sound, ultrasound and infrasound. Learn about the history, principles, applications and fields of acoustics, from ancient times to modern society.
Quantum acoustics is the study of sound under conditions where quantum effects are relevant, such as high frequency or low temperature sounds. It also refers to coupling superconducting qubits to acoustic waves or exploring lattice vibrations in analogy to quantum optics.
It is difficult, but very important, to match sound levels before comparing systems, as minute increases in loudness—more than 0.15 dB [11] or 0.1 dB [12] —have been demonstrated to cause perceived improvements in sound quality. Listening tests are subjected to many variables, and results are notoriously unreliable.
Acoustical engineering is the branch of engineering dealing with sound and vibration. It includes the application of acoustics, the science of sound and vibration, in technology. Learn about the subdisciplines, such as aeroacoustics, audio signal processing, architectural acoustics, and more.
Bell Labs is an American company that originated from the Bell System telephone conglomerate and developed many groundbreaking technologies, such as the transistor, the laser, and Unix. Learn about its origins, locations, subsidiaries, and Nobel and Turing laureates.
Acoustic resonance is a phenomenon in which an acoustic system amplifies sound waves whose frequency matches one of its own natural frequencies of vibration. Learn how acoustic resonance occurs in strings, tubes, cylinders, and other objects, and how it affects music, hearing, and sound production.
Sound localization is the ability to identify the location or origin of a sound in direction and distance. The web page explains the interaural cues (time and level differences) used by the auditory system, and the duplex theory of sound localization.
Physical acoustics is the area of acoustics and physics that studies interactions of acoustic waves with a gaseous, liquid or solid medium on macro- and micro-levels. This relates to the interaction of sound with thermal waves in crystals (), with light (), with electrons in metals and semiconductors (acousto-electric phenomena), with magnetic excitations in ferromagnetic crystals (), etc.