Noise reduction

device which reduces sound intensity or muzzle flash on a firearm

upright=1.35|thumb|A pair of headphones being tested inside an [[anechoic chamber for soundproofing]]

thumb|A person wearing earmuffs that provide hearing protection

method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first

process of removing noise from a signal

branch of engineering dealing with sound and vibration

audio processing device

type of headphones

open celled foam used for acoustic treatment

devices used to protect the ears; they are known as Personal Protective Equipment, which aims to reduce risks in the environment and protect hearing against the emergence of possible occupational diseases