Adaptive noise reduction technique for multi-point communication system
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Dec 17, 1996
filing date -
Aug 28, 1995
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A technique for suppressing noise in an audio signal is provided. An audio signal is received from an audio input device. A noise level for the audio signal is determined and continuously updated as the audio signal is received. The audio signal is then attenuated according to the relationship between its current energy level and the current noise level. If the audio signal falls below the current noise level, then a constant, maximum attenuation factor is applied to the signal. If the energy of the signal exceeds the noise level but does not exceed a predetermined maximum energy level that is higher than the noise level, then the audio signal is attenuated based on an exponential attenuation function. If the audio signal exceeds the predetermined maximum energy level, then no attenuation is applied. An attack and decay smoothing function dampens the response time of the attenuated output.
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