Process and apparatus for eliminating loudspeaker interference from microphone signals
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United States of America Patent
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Jan 27, 2004
Grant Date -
Aug 21, 2003
app pub date -
Sep 4, 2001
filing date -
Sep 1, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Filter system designed to remove loudspeaker-generated sound signals from a microphone signal, comprising a stereo sampling unit for sampling the interference-bearing microphone signal as well as the interfering loudspeaker signal in time (t) to generate samples x(t) and z(t) for provision to a computation unit which derives the transfer function H(f,T) effective between the loudspeaker and the microphone and applies that function to a filter unit which acts to restore the interference-free microphone signal y(t) from x(t), z(t) and H(f,T).
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