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Output of a computer model of underwater acoustic propagation in a simplified ocean environment. A seafloor map produced by multibeam sonar. Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries.
Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
Some hydraulophones include an underwater hydrophone pickup to allow the sounds produced by the water to be electrically amplified. Electric amplification allows effects to be added (as with an electric guitar) as well as making the hydraulophone a hyper-acoustic instrument (that is, using computation to change the acoustic sound of the water ...
A hydrophone can also detect airborne sounds but is insensitive of them because it is designed to match the acoustic impedance of water, a denser fluid than air. Sound travels 4.3 times faster in water than in air, and a sound wave in water exerts a pressure 60 times more than what is exerted by a wave of the same amplitude in air.
Underwater acoustic communication is a technique of sending and receiving messages in water. [1] There are several ways of employing such communication but the most common is by using hydrophones . Underwater communication is difficult due to factors such as multi-path propagation , time variations of the channel, small available bandwidth and ...
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[citation needed] [12] A sound sample can be found at The FreeSound Project. [13] There is a yearly "Waterphone Music Competition" sponsored by Richard Waters. [ citation needed ] It has also been featured heavily as a sound effect in shows such as Gordon Ramsay 's Kitchen Nightmares [ 14 ] and Hell's Kitchen (though only in the US versions ...
USBL (ultra-short baseline, also known as SSBL for super short base line) is a method of underwater acoustic positioning. A USBL system consists of a transceiver, which is mounted on a pole under a ship, and a transponder or responder on the seafloor, on a towfish, or on an ROV. A computer, or "topside unit", is used to calculate a position ...
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