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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.
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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 .
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.
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)
In early product manuals, Linn recommended using the Isobarik PMS in tri-amped configuration with Naim amplifiers. [1] Three NAP 250 amplifiers, fed by a 3-way Naim electronic crossover, would typically be used, one for each pair of the doubled-up treble, midrange and bass units. [ 9 ]
Adaptive noise cancelling is a signal processing technique that is highly effective in suppressing additive interference or noise corrupting a received target signal at the main or primary sensor in certain common situations where the interference is known and is accessible but unavoidable and where the target signal and the interference are unrelated, that is, uncorrelated [1] [2] [3].
The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone. The circuit may employ passive or active noise canceling techniques to filter out the noise, producing an output signal that has a lower noise floor and a higher signal-to-noise ratio.