efgh178
08-11-2010, 01:22 AM
The idea of personal noise protection by actively controlled headphones was originally documented in a 1960 Russian Heartbeats headphones (http://www.goodej2010.com)patent application.[1][2] In the United States, the idea for active noise cancellation for helicopter and aircraft pilots was patented by Dr. Lawrence J. Fogel as early as the mid 1950s U.S. Patent 2,866,848, U.S. Patent 2,920,138, U.S. Patent 2,966,549 and Canadian patent 631,136. According to Bose, the company started noise-cancellation involvement after Dr. Amar Bose went on a 1978 flight to Europe, utilized the headphones provided during the flight only to conclude that he couldn't really enjoy the sound with the roar of engines in the background."In 1986, Bose appliedBose earphones headphones (http://www.goodej2010.com) their noise-cancellation technology to develop headphones to protect the hearing of pilots participating in the first non-stop around-the-world flight.One source notes that "nearly simultaneously, the US company Bose and Sennheiser in Germany presented active headsetsBose earphones headphones (http://www.goodej2010.com) for aircraft pilots,"[1] citing a 1986 American Society of Mechanical Engineers paper about the Bose product and a 1988 Funkschau (see de:Funkschau) paper about the Sennheiser. Bose's first noise-cancelling headsets were released to the public in 1989.www.goodej2010.com/