Acoustics

phenomenon where acoustic systems amplify sound waves whose frequency matches one of its own natural frequencies of vibration (its resonance frequencies)

sound with a sinusoidal waveform

transfer of sound energy into internal energy of the absorber

range of frequencies that can be heard by humans or other animals

surface integral over the sound intensity

study of the propagation of sound in water and the interaction of sound waves with the water and its boundaries

difference between phase angles

branch of acoustics concerned with researching and describing the physics of music

mechanical energy produced by the rapid contraction of the outer hair cells of the cochlea

type of noise in signal processing

branch of engineering dealing with sound and vibration

REDIRECT Underwater acoustics

frequency characteristics of hearing and perceived volume

strategies to reduce noise pollution or its impact

method for suspending matter in a medium by using acoustic radiation pressure from intense sound waves in the medium

Thermoacoustics is the interaction between temperature, density and pressure variations of acoustic waves. Thermoacoustic heat engines can readily be driven using solar energy or waste heat and they can be controlled using proportional control. They can use heat available at low temperatures which makes it ideal for heat recovery and low power applications. The components included in thermoacoustic engines are usually very simple compared to conventional engines. The device can easily be controlled and maintained.

horizontal layer of water in the ocean at which depth the speed of sound is at its minimum

device in communications engineering

thumb|Inharmonic spectrum of a bell (dashed gray lines indicate harmonics). thumb|Harmonic spectrum. thumb|Comparing harmonic (top) and inharmonic (bottom) waveforms. 125px|thumb|Percussion bars, such as xylophone, are hung at ≈2/9 and ≈7/9 length, and struck at 1/2 length, to reduce inharmonicity.

canopy over pulpit

Physics apparatus for demonstrating acoustic standing waves in a tube

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.

thumb|upright=1.4|Video of air pollution data from Beijing being conveyed as a piece of music Sonification is the use of non-speech audio to convey information or perceptualize data. Auditory perception has advantages in temporal, spatial, amplitude, and frequency resolution that open possibilities as an alternative or complement to visualization techniques.

practices to avoid hearing damage from intentionally heard sounds

modeling of a highly complex system as multiple interconnected, simple components

Heat pump powered by sound

health consequences of exposure to elevated sound levels

room in which echoes and magnifies sound in an unusual way

thumb | rightAeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces. Noise generation can also be associated with periodically varying flows. A notable example of this phenomenon is the Aeolian tones produced by wind blowing over fixed objects.

ceramic vessels to improve acoustics

injury to the eardrum as a result of a very loud noise

measure for the exponential reduction of a quantity along a path due to absorption and scattering

psychoacoustic phenomenon

noise encountered in the workplace

sound other than the sound being monitored (primary sound)

the formation of sound waves following light absorption in a material

Psychoacoustical phenomenon

elastic waves propagating in solid plates or spheres

effect that occurs when the perception of one sound is affected by the presence of another sound

phenomenon of radiation of acoustic waves in solids that occurs when a material undergoes irreversible changes in its internal structure, e.g. crack formation or plastic deformation due to aging, temperature gradients or external mechanical forces

response that characterizes how an ear receives a sound from a point in space

how sound behaves in an enclosed space

branch of physics and acoustics

time derivative of the sound particle displacement

Acoustical device to generate a pitch

measure of the energy loss of sound propagation in media; phenomenon when hearing protectors help reduce acoustic flux from flowing into the ears, is measured in decibels (dBs)

phenomenon of wave mechanics

open celled foam used for acoustic treatment

opening in the body of a wind instrument

international scientific society

device that emits coherent acoustic radiation

technology for detecting incoming enemy aircraft, used before radar was developed

Archaeoacoustics is a sub-field of archaeology and acoustics which studies the relationship between people and sound throughout history. It is an interdisciplinary field with methodological contributions from room acoustics, archaeology, and computer simulation, and is broadly related to topics within cultural anthropology such as experimental archaeology and ethnomusicology. Since many cultures have sonic components, applying acoustical methods to the study of archaeological sites and artifacts may reveal new information on the civilizations examined. This is especially relevant for public ga

noise pollution

Visable spikes in a sound wave, usally detected for quantizing in music production & more.

negative symptoms in response to loud noise

relative unit of frequency in terms of doublings

studies the relationship, mediated through sound, between human beings and their environment

thin, semi-rigid membrane that vibrates to produce or transmit sound waves

acoustic technologies used to keep animals or humans away from an area