Method for canceling unwanted loudspeaker signals
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United States of America Patent
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Jan 6, 2009
Grant Date -
Apr 10, 2003
app pub date -
Sep 30, 2002
filing date -
Oct 3, 2001
priority date (Note) -
Expired
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Abstract
In a method for canceling unwanted signals from at least one external sound source, such as a loudspeaker, by means of headphones provided with microphones, at least known sound signals from the at least one external sound source are compensated by anti-phase sound signals. These sound signals simulate the at least known sound signals from said at least one external sound source in anti-phase. Said anti-phase sound signals are generated in the headphones in response to signals derived from audio input signals of the at least one external sound source in a filter device which is controlled by the resulting microphone signals.
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