Word: ares
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Dates: during 1980-1989
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The oversize, matte-black headsets look like the kind of industrial-strength ear protection worn by airport baggage handlers. But these are no ordinary earmuffs. They are high-tech earphones designed for pilots of small jets and other light (and noisy) aircraft. Rather than soften the drumming engine noise with...
The $965 aviation headset, made by Bose, a Framingham, Mass., manufacturer of hi-fi speakers, is one of the latest applications of antinoise, a surprising new technology that is changing the way people block unwanted sounds -- from the whine of electrical transformers to the rumble of internal- combustion engines -- while...
There are two ways to generate an antinoise wave. The analog approach, first developed in the 1930s using vacuum-tube technology, works something like a seesaw. A mechanism drives a loud speaker that pushes the air when incoming sound waves rise and pulls it back when the sound waves fall...
At least half a dozen firms are selling antinoise systems in the U.S. and Europe. A pair of British firms, Racal Acoustics and Plessey, sell antinoise headphones that combat cockpit noise in military vehicles, such as the Sea King helicopter and the Warrior attack vehicle. Digisonix, a division of Nelson...
No antinoise system is perfect. The digital devices work well with repetitive noises, like the sounds of fans and turbines, but cannot stop random or unexpected noises. Analog systems fight low, random noises but do it by eliminating all low-frequency sounds, good or bad. And none of the antinoise...