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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 ...
Wikinews has related news: Five police officers killed in Dallas, Texas during sniper attack. On July 7, 2016, Micah Xavier Johnson ambushed and shot police officers in Dallas, Texas, killing five, injuring nine others, and wounding two civilians. Johnson, a 25-year-old Army Reserve Afghan War veteran, was angry over police shootings of black men.
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 ...
A shooting at a Dallas gun range Friday evening left one man dead and the suspect in critical condition, police said. Officers responded to the 1600 block of West Mockingbird Lane around 5:20 p.m.
Otorhinolaryngology, audiology. Noise-induced hearing loss ( NIHL) is a hearing impairment resulting from exposure to loud sound. People may have a loss of perception of a narrow range of frequencies or impaired perception of sound including sensitivity to sound or ringing in the ears. [ 1] When exposure to hazards such as noise occur at work ...
February 19, 2024 at 5:03 PM. Police shot at a 16-year-old student holding a gun Monday morning at a suburban Dallas charter school as they negotiated with him to put down his weapon, authorities ...
Silencer (firearms) A silencer, also known as a sound suppressor, suppressor, or sound moderator, is a muzzle device that suppresses the blast created when a gun ( firearm or airgun) is discharged, thereby reducing the acoustic intensity of the muzzle report (sound of a gunshot) and jump, by modulating the speed and pressure of the propellant ...
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 ...