Noise reduction system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 28, 1990
Grant Date -
N/A
app pub date -
Apr 7, 1989
filing date -
Jul 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order 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.
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