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Noise generated on board ships and submarines can have far-reaching effects on the ability of the vessel to operate safely and efficiently. Military vessels in particular need to be quiet to avoid detection by sonar , so many methods have been used to limit a vessel's noise signature.
A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
The Potez-CAMS 141 was designed by Chantiers Aéro-Maritimes de la Seine (or CAMS, which since 1933 had been part of Potez) to meet a 1935 French Navy specification for a long range marine reconnaissance flying boat to replace obsolete aircraft such as the Breguet Bizerte, competing against the Latécoère 611 and Breguet 730.
The amplifying devices in audio and radio equipment are vulnerable to a variety of feedback problems, which can cause distinctive noise in the output. The term motorboating is applied to oscillations whose frequency is below the range of hearing, from 1 to 10 hertz , [ 3 ] so the individual oscillations are heard as pulses.
It also reviews most common other marine goods and devices such as engines, solar panels, batteries, pumps and osmosis/treatment units. It contains authoritative information about boating rules, weather, tide, currents, navigation, seamanship for powerboats, small craft, and boats under sail; anchoring, communications, and navigation; inland ...
This muting prevents the speaker from hearing their own voice returning from the far end. Echo cancellation involves first recognizing the originally transmitted signal that re-appears, with some delay, in the transmitted or received signal. Once the echo is recognized, it can be removed by subtracting it from the transmitted or received signal.
Fogel is considered to be the inventor of active noise cancellation, and he designed one of the first noise-cancelling headphones systems. Later on, Willard Meeker designed an active noise control model that was applied to circumaural earmuffs for advanced hearing protection. Noise-cancelling aviation headsets are now commonly available. [5] [6]
Torpedo boat (fast attack craft) Displacement: 183.4 tonnes standard, 210 tonnes full load: Length: 42.6 m (139 ft 9 in) Beam: 7.1 m (23 ft 4 in) Draught: 2.3 m (7 ft 7 in) Propulsion: 4 Maybach MD 871 diesel engines, 3000 PS each (replaced by MD 872 engines with 3600 PS in the late 1960s)