** Acoustic metamaterials, engineered materials with atypical properties

* Acoustic metamaterials

Acoustic guitars are commonly constructed in several different body shapes.

Throughout the world there are many organizations and institutions dedicated to the area of computer and electronic music study and research, including the ICMA ( International Computer Music Association ), IRCAM, GRAME, SEAMUS ( Society for Electro Acoustic Music in the United States ), CEC ( Canadian Electroacoustic Community ), and a great number of institutions of higher learning around the world.

Acoustic problems always require allowing compressibility, since sound waves are compression waves involving changes in pressure and density of the medium through which they propagate.

Acoustic guitars are several notable subcategories within the acoustic guitar group: classical and flamenco guitars ; steel-string guitars, which include the flat-topped, or " folk ," guitar ; twelve-string guitars ; and the arched-top guitar.

Acoustic and mechanical responses are due to collective motions as well.

Acoustic stethoscopes are familiar to most people, and operate on the transmission of sound from the chest piece, via air-filled hollow tubes, to the listener's ears.

Acoustic stethoscopes are the most commonly used.

High and ultra high ultrasound waves are used in Acoustic microscopy

Acoustic couplers are still used by people travelling in areas of the world where electrical connection to the telephone network is illegal or impractical.

Acoustic phonetics deals with the physical properties of sound, what sounds exactly are coming from the person speaking.

Acoustic energy is variation in the air pressure that can be represented as sound waves, which are then perceived by the human auditory system as sound.

Acoustic pipes are made by various makers and sold under various brands.

The deviations from this theme are Punk Goes Acoustic and Punk Goes Acoustic 2 ( in which the featured bands recorded acoustic versions of their own songs ); Punk Goes Pop 1, 2, 3 and 4 ; and Punk Goes Classic Rock.

Acoustic amplifiers are designed to produce a " clean ", transparent, " acoustic " sound when used with acoustic instruments with built-in transducer pickups and / or microphones.

Acoustic amplifiers are designed to produce a " clean ", transparent, " acoustic " sound when used with acoustic instruments with built-in transducer pickups and / or microphones.

Acoustic, inertial, LED, magnetic or reflective markers, or combinations of any of these, are tracked, optimally at least two times the frequency rate of the desired motion, to submillimeter positions.

Acoustic guitar bands based on a Spanish model are the country's best-known indigenous popular tradition, especially national stars Desmali y su Grupo Dambo de la Costa.

Acoustic 5-string violins are becoming more common, and it is not unusual for an electric violin to have 5, 6, 7 or more strings.

Acoustic cavity resonators, in which sound is produced by air vibrating in a cavity with one opening, are known as Helmholtz resonators.

Notably absent from the completed album are " Mercedes ", " Apollonia ", " Iceache ", " Death by Plane ", " Solid Gold ", " Acoustic One ", and " Kool-Aid Party ".

The Pontardawe Festival of world music and dance has been held in August each year since 1978 and there are also regular meetings of such music groups as the Pontardawe Acoustic Music Club, held every Wednesday at the Pontardawe Inn ( Y Gwachel ), and the long-established Valley Folk Club, held on the first and third Fridays of each month at the Ivy Bush Hotel.

A Long Range Acoustic Device ( LRAD ) in use on the USS Blue Ridge ( LCC-19 ) | USS Blue RidgeSonic and ultrasonic weapons ( USW ) are weapons of various types that use sound to injure, incapacitate, or kill an opponent.

Acoustic " pingers " have been fitted to the nets to warn off dolphins and whales and the nets are not in place in winter, the whale migration season.

Acoustic homing and detection systems used for ships are also susceptible to countermeasures.

Acoustic instruments can also be made out of artificial materials, such as carbon fiber and fiberglass ( particularly the larger instruments, such as cellos and basses ).

Recently completed is a 450-seat concert hall, called the Bramall Music Building, which completes the redbrick semicircle of the Aston Webb building designed by Glenn Howells Architects with venue design by Acoustic Dimensions.

Acoustic Doppler velocimetry ( ADV ) is designed to record instantaneous velocity components at a single point with a relatively high frequency.

Acoustic guitars have a normal microphone, designed to convert acoustic vibrations into an electrical signal, but usually they do so from direct contact with the strings ( replacing the guitar's bridge ) or with the guitar's body, rather than having a membrane like general-purpose microphones.

* Acoustic amplifiers, similar in many ways to keyboard amplifiers but designed specifically to produce a " clean ," transparent, " acoustic " sound when used with acoustic instruments with built-in transducer pickups and / or microphones.

The muffler is engineered as an acoustic soundproofing device designed to reduce the loudness of the sound pressure created by the engine by way of Acoustic quieting.

The Eugene McDermott Concert Hall, designed by Russell Johnson's firm, Artec Acoustic Consultants ( also responsible for the Pikes Peak Center's El Pomar Great Hall ), is in the standard European shoebox style and seats 2, 062.

Acoustic torpedoes are usually designed for medium-range use, and often fired from a submarine.

Acoustic quieting, noise mitigation, and noise control can be used to limit unwanted noise.

' This Is Not A Riot ' featured samples of crowd chants recorded at various demonstrations around the world, as well as the sampling of the LRAD Long Range Acoustic Device riot control sonic weapon.

It was a direct result of writing songs ", she said at the press release of her debut album, Acoustic Soul.

Acoustic theory is the field relating to mathematical description of sound waves.

** Acoustic dispersion, for sound waves

Sometimes, for the sake of appearance or of the desired " feel " of the instrument, a drum with a trigger will be used as a trigger pad by muffling it so heavily that no significant sound at all is produced, see Electronic drum # Acoustic triggered drum kit.

* Acoustic location, the general use of sound to locate objects

Acoustic or sound waves travel at speed given by

Acoustic resonance is a branch of mechanical resonance that is concerned with the mechanical vibrations across the frequency range of human hearing, in other words sound.

* Acoustic keyloggers: Acoustic cryptanalysis can be used to monitor the sound created by someone typing on a computer.

; Acoustic tablets: Early models were described as spark tablets — a small sound generator was mounted in the stylus, and the acoustic signal picked up by two microphones placed near the writing surface.

Acoustic enhancement systems help give a more even sound in the hall and prevent " dead spots " in the audience seating area by "... augment a hall's intrinsic acoustic characteristics.

* Scanning Acoustic Tomography, a research process using focused sound

However, Electric Acoustic Stimulation ( EAS ) devices, including the Hybrid " short-electrode " cochlear implant, have been developed that combine a cochlear implant with a sound amplifying hearing aid.

Green Carnation's trend of music has continuously become less and less heavy after every release ; from straight forward death metal, to a gothic metal / doom metal / progressive metal sound, to a melancholic hard rock-sounding form of progressive rock and in 2006, went as far as to releasing an entirely acoustic album Acoustic Verses.

* Acoustic or pressure ( p ) modes, driven by internal pressure fluctuations within a star ; their dynamics being determined by the local speed of sound.

Other efforts included the album Acoustic, spotlighting their " wooden " sound, a duet with Karla Bonoff, " You Believed in Me " for the MCA Olympic compilation, One Voice, and a cover version of Buddy Holly's " Maybe Baby " for the Decca tribute album, Not Fade Away.

Acoustic impedance indicates how much sound pressure is generated by the vibration of molecules of a particular acoustic medium at a given frequency.