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

* 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 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 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.

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, 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.

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

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.

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

* Acoustic spectroscopy involves radiated pressure waves.

High and ultra high ultrasound waves are used in Acoustic microscopy

Acoustic holography, applied to MDI data, is ideal for the detection of sources and sinks of acoustic waves on the Sun.

Acoustic levitation uses sound waves to provide a levitating force.

* Acoustic mirror, a device used to focus and amplify sound waves

Acoustic metamaterials are artificially fabricated materials designed to control, direct, and manipulate sound in the form of sonic, infrasonic, or ultrasonic waves, as these might occur in gases, liquids, and solids.

Acoustic logs measure characteristics of sound waves propagated through the well-bore environment.

Acoustic waves encountering material with a radically different speed of sound do not penetrate, but bounce back.

Acoustic analog recording is achieved by a small microphone diaphragm that can detect changes in atmospheric pressure ( acoustic sound waves ) and record them as a graphic representation of the sound waves on a medium such as a phonograph ( in which a stylus senses grooves on a record ).

Acoustic emission ( AE ) is the sound waves produced when a material undergoes stress ( internal change ), as a result of an external force.

Acoustic pulses travel great distances in the ocean because they are trapped in an acoustic " wave guide ".

In addition to Pixies and LoudQUIETloud, four other Pixies ' DVDs were released between 2004 and 2006, all featuring concert performances: Live at the Town and Country Club 1988, The Pixies — Sell Out, The Pixies Acoustic: Live in Newport, and The Pixies Club Date: Live at the Paradise in Boston.

On June 29, 2008, Baez performed on the Acoustic Stage at the Glastonbury Festival in Glastonbury, U. K., playing out the final set to a packed audience.

In 2004, Copeland and Summers joined Incubus onstage at KROQ's Almost Acoustic Christmas concert in Los Angeles performing " Roxanne " and " Message in a Bottle ".

The record Middle of Nowhere Acoustic was released at the end of that year, exclusively on Hanson. net.

* " Red Sky "-Thrice ( appeared during the band's live set at the KROQ Almost Acoustic Christmas in 2005 )

* Live in Seattle: Acoustic at Tower Records ( 2004 ) Online-released

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

Acoustic Romanian style of music, inspired by American folk music, with sweet lyrics and played almost exclusively at the guitar.

When the band was asked to perform at the 1994 Almost Acoustic Christmas in Los Angeles for radio station KROQ, Hoerner refused to join them, leaving Enigk, Mendel, and Goldsmith to perform the show as a trio.

Orest Symko at University of Utah began a research project in 2005 called Thermal Acoustic Piezo Energy Conversion ( TAPEC ).

* Acoustic Hailing Device, an audio device capable of providing high acoustic output at significant distance

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.

The final track, " Creep ( Acoustic )", is also present on the My Iron Lung EP, and was recorded at KROQ-FM studios, Los Angeles, on 13 July 1993.

* Acoustic performances at RockRemedy. com: " Green and Grey " | " Into the Wind "

Acoustic mirrors at Denge

On February 3, 2011, " Mona Lisa " was released on The Alternative Press website to be streamed for free, although it was played previously at an Acoustic set for 104. 5 Radio with " On Love, On Life ".

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.

* Hoekje, Peter L. and William Fickinger, " Acoustic teaching apparatus before 1929 at the Case School of Applied Science ".

* Within Temptation – An Acoustic Night at the Theatre ( 2009 ) – Track # 6 " Somewhere " ( Live Only )

* Shane Shu – " Push Me to the Ground " Single ( 2010 ) – " Push Me To The Ground " ( Acoustic Only ) ( She also performed an acoustic version of " Push Me to the Ground ", live with Shane Shu at the Giel Beelen show )