公开(公告)号：EP0694197A1

公开(公告)日：1996-01-31

申请号：EP94913962.0

申请日：1994-04-01

申请人： NOISE CANCELLATION TECHNOLOGIES, INC.

发明人： EATWELL, Graham P., 26 East Drive ,  LANGLEY,Andrew, 28 Canons Field

IPC分类号： G10K11 ,  H04S7

CPC分类号： H03G3/32 ,  G10K11/17817 ,  G10K11/17875 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1053 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3045 ,  H04R2460/01 ,  H04S7/301 ,  H04S7/307

摘要： An improved audio system designed to maintain a desired sound at the ear of a listener by using an equalization filter (2). The equalization filter (2) is continuously adjusted in response to the signal (9) from a sensor (8) which monitors the sound close to the listener's ear. The audio system can be combined with an active noise control system (3) to reduce interference from external noise.