Active Noise Control in Mobile Devices
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United States of America Patent
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Issued Date -
Apr 21, 2011
app pub date -
Oct 19, 2010
filing date -
Oct 20, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A three dimensional area of quiet is created by an active noise cancellation system comprising a reference microphone receiving background noise and sending the noise signal to an adaptive active noise canceller. An adaptive filter system using weights updated by a least mean squares method or other method generates an anti-phase signal which is broadcasted to counteract the background noise. The resulting residual noise or residual signal is sent back to the adaptive active noise canceller to reset the weights of the adaptive filter.
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