专利名称：Improvements in and relating to
communications systems
发明人：Clough, Patrick Vincent France,Lobo,
Natividade Albert
申请号：EP83300432.8申请日：19830127公开号：EP0084982B1公开日：19871111
摘要：A noise cancelling system comprises two conventional noise cancellingmicrophones (1, 2) spaced apart by a distance of up to 10 cms with use of themicrophones (1) being arranged to be close to the mouth of a user for reception ofspeech and the other (2) spaced therefrom and used as a reference microphone. Thesignals from the microphone are processed by means (7) which use a batch of signalsderived from the reference microphone (2) to modify a signal derived from the speechmicrophone in accordance with the Widrow algorithm known in the art. This systemenables effective noise cancellation to be achieved with a delay of only 0.1 sec.
申请人：RACAL ACOUSTICS LIMITED
地址：Beresford Avenue Wembley Middlesex HA0 1RU GB
国籍：GB
代理机构：Crawford, Andrew Birkby
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