Noise reducing sound reproduction system
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United States of America Patent
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Apr 4, 2017
Issued Date -
N/A
app pub date -
Jul 25, 2012
filing date -
Jul 26, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A noise reducing sound reproduction system and method is disclosed, in which an input signal is supplied to a loudspeaker by which it is acoustically radiated. The signal radiated by the loudspeaker is received by a microphone that is acoustically coupled to the loudspeaker via a secondary path and that provides a microphone output signal. The microphone output signal may be subtracted from a useful-signal to generate a filter input signal. The filter input signal may be filtered in an active noise reduction filter to generate an error signal. The useful-signal may be subtracted from the error signal to generate the loudspeaker input signal, and the useful-signal may be filtered by one or more low-pass filters prior to subtraction from the microphone output signal.
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