Acoustic location in air was used before the introduction of radar.

* Acoustic location, a pre-radar and pre-sonar method of detecting hostile vehicles and vessels

* Acoustic location

** Surface Acoustic Wave touchscreens, an electronic visual display that can detect the presence and location of a touch within the display area

* Acoustic location

* Acoustic location

* Acoustic location

Acoustic guitars ( and similar instruments ) with hollow bodies have been in use for over a thousand years.

Acoustic resonance is an important consideration for instrument builders, as most acoustic instruments use resonators, such as the strings and body of a violin, the length of tube in a flute, and the shape of, and tension on, a drum membrane.

In some cases, riot squads may also use Long Range Acoustic Devices, water cannons, armoured fighting vehicles, police dogs or mounted police on horses.

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.

The acquisition also included the Recto, Spike master, Amebic and Dishwasher brands for use on any products and the Jensen, Advent, Acoustic Research and Road Gear brands for electronics products in 2003.

This acquisition included the rights to the RCA Accessories brand for consumer electronics accessories, as well as the Recoton, Spikemaster, Ambico and Discwasher brands for use on any product category, and the Jensen, Acoustic Research and Road Gear brands for consumer electronics accessories.

* Acoustic refrigerators are refrigerators that use resonant linear reciprocating motors / alternators to generate a sound that is converted to heat and cold using compressed helium gas.

Acoustic fretless guitars produce less volume than their fretted counterparts, which is usually addressed by the use of pickups and amplification.

Toronto Fire will also acquire use of the Long Range Acoustic Device.

The Acoustic Kitty was a CIA project to use surgically modified cats to spy on the Kremlin and Soviet embassies in the 1960s.

Combined use of Fibroscan and Fibrotest could avoid a liver biopsy in most patients with chronic hepatitis C. Other ultrasonic techniques used to characterize liver stiffness include Acoustic Radiation Force Impulse ( ARFI ) Imaging.

Acoustic Kitty was a CIA project launched by the Directorate of Science & Technology in the 1960s attempting to use cats in spy missions, intended to spy on the Kremlin and Soviet embassies, recording the links between the buildings in the area.

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

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 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 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 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.