History
1934 - The first patent for a noise control system was granted to inventor Paul Lueg U.S. Patent 2,043,416. The patent described how to cancel sinusoidal tones in ducts by phase-advancing the wave and cancelling arbitrary sounds in the region around a loudspeaker by inverting the polarity.
1950s - With U.S. Patent 2,866,848, U.S. Patent 2,920,138, U.S. Patent 2,966,549 by Lawrence J. Fogel, systems were created to cancel the noise in helicopter and airplane cockpits.
1957 - Willard Meeker developed a paper design and working model of active noise control applied to a circumaural earmuff. This headset had an active attenuation bandwidth of approximately 50-500 Hz, with a maximum attenuation of approximately 20 dB.
1986 - Dick Rutan and Jeana Yeager used prototype headsets built by Bose in their around-the-world flight.
Read more about this topic: Active Noise Control
Famous quotes containing the word history:
“The greatest honor history can bestow is that of peacemaker.”
—Richard M. Nixon (1913–1995)
“The only thing worse than a liar is a liar that’s also a hypocrite!
There are only two great currents in the history of mankind: the baseness which makes conservatives and the envy which makes revolutionaries.”
—Edmond De Goncourt (1822–1896)
“I am ashamed to see what a shallow village tale our so-called History is. How many times must we say Rome, and Paris, and Constantinople! What does Rome know of rat and lizard? What are Olympiads and Consulates to these neighboring systems of being? Nay, what food or experience or succor have they for the Esquimaux seal-hunter, or the Kanaka in his canoe, for the fisherman, the stevedore, the porter?”
—Ralph Waldo Emerson (1803–1882)