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Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [3][4] Changes in the immune system and birth defects have been also attributed to noise exposure. [5] Although age-related health effects (presbycusis) occur naturally with age, [6] in many ...
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 ...
One concluded that deaf drivers were safer than hearing drivers, one concluded that deaf and hearing female drivers performed similarly but deaf male drivers crashed more frequently, and the other ...
Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...
While it may be desirable to have a noise-canceling headphone that used sound cancellation across the entire spectrum, it's just not practical or cost-effective given today's technology - it like saying that automobiles that get 50 miles/gallon aren't "properly adjusted" because they don't get 400 miles/gallon.
Although vibration plates are safe for most people, ultimately, Johnson says, “when we make changes, we tell people to listen to their body.”. Deja Mason of Roanoke, Virginia, said she first ...
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