METHOD AND SYSTEM FOR NOISE CANCELLATION
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United States of America Patent
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Issued Date -
Nov 24, 2011
app pub date -
Feb 18, 2010
filing date -
Feb 20, 2009
priority date (Note) -
Abandoned
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Abstract
A noise cancellation signal is generated based on detected ambient noise, such that the noise cancellation signal and a wanted sound signal can be applied to a speaker. Gain control is applied to the wanted sound signal based on a comparison between the detected ambient noise level and the wanted sound signal level, for example such that the level of the wanted sound signal after the gain has been applied exceeds the level of a detected ambient noise signal by a certain threshold. Steps may also be taken such that the total level of the wanted sound signal after the gain has been applied and of the detected ambient noise signal do not exceed a second threshold, to avoid saturating the speaker to which they are applied.
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