Acoustic couplers were sensitive to external noise and depended on the widespread standardisation of the dimensions of telephone handsets.

Acoustic couplers were cabled to TTYs enabling the Bell Telephone Company standard Model 500 telephone to couple, or fit, into the rubber cups on the coupler, thus allowing the device to transmit and receive a unique sequence of tones generated by the different corresponding TTY keys.

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 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.

His other guitars include a Cherry Red Gibson SG, a Green Custom Jazzbird, a Green Jazzmaster ( which he destroyed at Feeder's headline set at Download 2005 and later said he regretted it, but still has the neck to make a new guitar with ), a Gibson Firebird, a custom ESP " Gibstang ", a Sunburst Gibson J-200 Acoustic and a natural finish Yamaha acoustic ( for recording ).

The lake is still used by the Navy's Acoustic Research Detachment to test large-scale submarine prototypes: the significant depth gives acoustic properties similar to the open ocean.

Cousins is still active, and is touring North America and Europe with Acoustic Strawbs, several months every year.

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 in air was used before the introduction of radar.

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

Acoustic harassment devices and acoustic deterrent devices used by aquaculture facilities to scare away marine mammals emit loud and noxious underwater sounds.

* Acoustic recording, a pre-microphone method of recording used, for instance, on the Graphophone

Acoustic sensing used a microphone in a missile.

Pat Metheny used the Acoustic 134 model combo guitar amplifier.

The Mahavishnu Orchestra members ( bass, keyboards, violin excluding John McLaughlin ( gtr )) used Acoustic amplifiers.

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

* Insertion Gain Smoothing, a technique used in Signal Processing, primarily with regards to Acoustic Technologies

Acoustic violins may be used with an add-on piezoelectric bridge or body pickup, or a magnetic pickup attached to the fingerboard end.

* Acoustic paramagnetic resonance, a resonant absorption effect used in magnetic resonance spectroscopy

* Toyota — Toyota Variable Induction System ( T-VIS ), used in the early versions of the 1G-GEU, 3S-GE, 7M-GE, and 4A-GE families, and Acoustic Control Induction System-( ACIS ).

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

Acoustic lenses similar to acoustic mirrors are used today as novelty items — " whisper dishes " — in science museums to allow patrons to whisper across long distances, for example at Ontario Science Centre, San Francisco's Exploratorium, and Parkes Observatory in Australia.

For amplification, King used a solid-state Acoustic amplifier, with a speaker cabinet with two 15 " speakers and a horn (" which may or may not have been operative ").

Electromyography, Acoustic reflex testing ( formerly the gold standard ), MRI, CT scanning, transcranial magnetic stimulation, blink reflex tests, and maximal / minimal stimulation tests may also be used to asses the viability of the nerves.