Hands free noise canceling headset
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United States of America Patent
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-
Dec 16, 1997
Grant Date -
N/A
app pub date -
Oct 27, 1994
filing date -
Apr 30, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the area of active noise cancellation headsets, the noisy environment often encountered in the link with communication systems causes lack of intelligibility on the outward communications path. Consequently another in-wire cancellation channel to enhance the intelligibility is required. This additional processing channel adds to the cost of the headset. The invention uses residual microphones (12) to reproduce the sound that remains in the ear after cancellation so that the controller (13) can make further adjustments through filter (15) and LMS adapter (14) to the anti-noise signal.
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