Noise reduction systems

Details Noise reduction systems Noise reduction systems

G - Physics

10

K

349/28, 179/5

G10K 11/16 (2006.01) G10K 11/178 (2006.01) H04R 3/00 (2006.01)

Patent

CA 1299725

ABSTRACT IMPROVEMENTS RELATING TO NOISE REDUCTION SYSTEMS To overcome problems in an active noise reduction system of sound buffets at low frequency and signal enhancement caused by imperfect transfer functions of a noise cancelling sound generator and a microphone, one or more high pass filters for reducing low frequency signals are provided in a feedback loop between the sound generator and microphone. A low pass filter is provided for extending the bandwidth of the system but which does not introduce unduly large phase shifts.

572420

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