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Hydrophone. A hydrophone ( Ancient Greek: ὕδωρ + φωνή, lit. 'water + sound') is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave.
A vintage (76-89) marine VHF radiotelephone. Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters ), and in certain circumstances ship-to-aircraft. It uses FM channels in the very high frequency ...
Sonar. French F70 type frigates (here, La Motte-Picquet) are fitted with VDS (variable depth sonar) type DUBV43 or DUBV43C towed sonars. Sonar ( sound navigation and ranging or sonic navigation and ranging) [2] is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging ...
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African American Vernacular English speakers do not simply replace "is" with "be" across all tenses, with no added meaning. In fact, AAVE speakers use "be" to mark a habitual grammatical aspect not explicitly distinguished in Standard English. "420" did not originate from the Los Angeles police or penal code for marijuana use.
Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...
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