Acoustics Acoustics The threshold of hearing is the Sound pressure level SPL of 20 µPa (micropascals) = 2 × 10-5 pascal (Pa). This low threshold of amplitude (strength or sound pressure level) is frequency dependent. See the frequency curve in Fig. 2. ...more on Wikipedia about "Absolute threshold of hearing"
Absorption refers to the absorption of sound waves by a material. ...more on Wikipedia about "Absorption (acoustics)"
(Absorption coefficient) This is a property of a material. It defines the extent to which a material 'absorbs' sound. Wallace Sabine was a pioneer of this concept and defined the unit of the Sabine. A unit Sabine is the amount of power absorbed by a 1m square of open window. ...more on Wikipedia about "Absorption coefficient"
In some branches of physics, including acoustics and fluid mechanics, a classical signal horizon (e.g. an acoustic horizon) can radiate weakly and "leak" information. This effect is analogous to the Hawking radiation behaviour predicted by quantum mechanics for the region of curved spacetime around a black hole. ...more on Wikipedia about "Acoustic Hawking radiation"
The acoustic impedance Z (or sound impedance) is the ratio of sound pressure p to particle velocity v in a medium or acoustic component. ...more on Wikipedia about "Acoustic impedance"
An acoustic interferometer is an instrument for measuring the physical characteristics of sound waves in a gas or liquid. It may be used to measure velocity, wavelength, absorption, or impedance. A vibrating crystal creates the waves that are radiated into the medium. The waves strike a reflector placed parallel to the crystal. The waves are then reflected back to the source and measured. ...more on Wikipedia about "Acoustic interferometer"
Acoustic or sonic lubrication occurs when sound (measurable in a vacuum by placing a microphone on one element of the sliding system) permits vibration to introduce separation between the sliding faces. This could happen between two plates or between a series of particles. The frequency of sound required to induce optimal vibration, and thus cause sonic lubrication, varies with the size of the particles (high frequencies will have the desired, or undesired, effect on sand and lower frequencies will have this effect on boulders). ...more on Wikipedia about "Acoustic lubrication"
In mathematical physics, a metric (mathematics) describes the arrangement of relative distances within a surface or volume, usually measured by signals passing through the region – essentially describing the intrinsic geometry of the region. An acoustic metric will describe the signal-carrying properties characteristic of a given particulate medium in acoustics, or in fluid dynamics. Other descriptive names such as sonic metric are also sometimes used, interchangeably. ...more on Wikipedia about "Acoustic metric"
An acoustic mirror is a device used to focus and amplify sound waves. ...more on Wikipedia about "Acoustic mirror"
An acoustic network is a method of positioning equipment using sound waves. It is primarily used in water, and can be as small or as large as required by the users specifications. ...more on Wikipedia about "Acoustic network"
Lute (harp, guitar, piano, violin etc.) strings have a fundamental resonant frequency directly related to the length and tension of the string. The wavelength that will create the first resonance on the string is equal to twice the length of the string. This frequency is related to the speed v of a wave traveling down the string by the equation ...more on Wikipedia about "Acoustic resonance"
Acoustic transportation is a process that was developed by John Maxwell Hobbs and David Hykes. ...more on Wikipedia about "Acoustic transportation"
The Acoustical Society of America is an international scientific society dedicated to increasing and diffusing the knowledge of acoustics and its practical applications. ...more on Wikipedia about "Acoustical Society of America"
Acoustics is a branch of physics and is the study of sound, mechanical waves in gases, liquids, and solids. A scientist who works in the field of acoustics is an acoustician. The application of acoustics in technology is called acoustical engineering. There is often much overlap and interaction between the interests of acousticians and acoustical engineers. ...more on Wikipedia about "Acoustics"
Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or by aerodynamic forces interacting with surfaces. Noise generation can also be associated with periodically varying flows. Although no complete rational scientific theory of the generation of noise by aerodynamic flows has yet prevailed, most practical aeroacoustic analyses rely upon the so-called aeroacoustic analogy whereby the governing equations of fluid dynamics are combined with the wave equation of classical acoustics. Although various such analogies currently exist, by far the most common and widely used is Lighthill's aeroacoustic analogy, first proposed by James Lighthill in the 1950s when noise generation associated with the jet engine was beginning to be placed under scientific scrutiny. ...more on Wikipedia about "Aeroacoustics"
Akoustolith is a porous ceramic material resembling stone. It was used to limit acoustic reflection and noise in large vaulted ceilings. The most prevalent use was to aid speech intelligibility in cathedrals and churches prior to the widespread use of public address systems. Akoustolith was bonded as an additional layer to the structural tile of the Tile Arch System ceilings built by the Raphael Guastavino Company of New Jersey. Akoustolith was a patented product of a collaboration between Rafael Guastavino and Harvard professor Wallace Sabine over a period of years starting in 1911. ...more on Wikipedia about "Akoustolith"
An anechoic chamber is a room that is isolated from external sound or electromagnetic radiation sources, sometimes using sound proofing, and prevents the reflection of wave phenomena ( reverberation). Anechoic chambers are widely used for measuring the acoustic properties of acoustic instruments, measuring the transfer functions of electro-acoustic devices, testing microphones and performing psychoacoustics experiments (such as measuring the quality of audio codecs or measuring head-related transfer functions). ...more on Wikipedia about "Anechoic chamber"
Architectural acoustics is the science of controlling quality of sound in buildings. One of the main applications of architectural acoustics is in the design of concert halls. ...more on Wikipedia about "Architectural acoustics"
A cavity resonator uses resonance to amplify an electromagnetic wave. The cavity has interior surfaces which reflects an electromagnetic wave of a specific frequency. ...more on Wikipedia about "Cavity resonator"
A combination tone, also called a sum tone or a difference tone, can be any of at least three similar psychoacoustic phenomena. When two tones are played simultaneously, a listener can sometimes perceive an additional tone whose frequency is a sum or difference of the two frequencies. The discovery of one of these phenomena is credited to the violinist Giuseppe Tartini, and so the tones are also called Tartini tones. ...more on Wikipedia about "Combination tone"
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. ...more on Wikipedia about "Creeping wave" shortopedia - forget the rest. shortopedia
Cymatics is the study of wave phenomena. It is typically associated with the physical patterns produced through the interaction of sound waves in a medium. (See list of wave topics.) ...more on Wikipedia about "Cymatics"
Dr. D. Van Holliday was born in Ennis, Texas and attended the University of Texas at Austin. He graduated with a B.S. and M.A. in Physics and did extensive theoretical and experimental research on the Mössbauer effect. ...more on Wikipedia about "D. Van Holliday"
The decibel (dB) is a measure of the ratio between two quantities, and is used in a wide variety of measurements in acoustics, physics and electronics. While originally only used for power and intensity ratios, it has come to be used more generally in engineering. The decibel is widely used as a measure of the loudness of sound. It is a " dimensionless unit" like percent. Decibels are useful because they allow even very large or small ratios to be represented with a conveniently small number. This is achieved by using a logarithm. ...more on Wikipedia about "Decibel"
Denge is a former Royal Air Force site near Dungeness, in Kent, England. It is best known for the early experimental acoustic mirrors which remain there. ...more on Wikipedia about "Denge"
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