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Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...
A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss. HPDs reduce the level of the noise entering the ear. HPDs can also protect against other effects of noise exposure such as tinnitus and ...
Adaptive noise cancelling. 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 ...
Muzzle brake. A muzzle brake or recoil compensator is a device connected to, or a feature integral ( ported barrel) to the construction of, the muzzle or barrel of a firearm or cannon that is intended to redirect a portion of propellant gases to counter recoil and unwanted muzzle rise. [ 1] Barrels with an integral muzzle brake are often said ...
A hearing protection device (HPD) is an ear protection device worn in or over the ears while exposed to hazardous noise to help prevent noise-induced hearing loss. HPDs reduce (not eliminate) the level of the noise entering the ear. HPDs can also protect against other effects of noise exposure such as tinnitus and hyperacusis.
Of the 2,477 gun-owning adults who responded to the survey, 79% reported protection as the most important reason for owning a firearm, and 52% reported carrying a firearm outside their home within ...
Additionally, the discharging of firearms in indoor ranges can produce noise levels of over 140 dB sound pressure level. [18] To combat this, it is commonly recommended that those inside the range "double-up" ear protection by using both earplugs and over-the-head earmuffs, and to protect range bystanders from sound exposure. Depending on the ...
SYDNEY (Reuters) -Australia will begin co-manufacturing guided weapons with the US next year to boost supply for allies in the Indo Pacific and increase a US military presence in the country ...