G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 21/02 (2006.01) G10L 19/02 (2006.01)
Patent
CA 2326879
An adaptive noise suppression system includes an input AID converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow it to compute a filtering coefficient, which is input to the filter. In these paths, feed-forward signal are processed by a signal to noise ratio estimator, a normalized coherence estimator, and a coherence mask. Also, feedback signals are processed by a auditory mask estimator. These two signal paths are coupled together via a noise suppression filter estimator. A method according to the present invention includes active signal processing to preserve speech-like signals and suppress incoherent noise signals. After a signal is processed in the feed-forward and feedback paths, the noise suppression filter estimator then outputs.a filtering coefficient signal to the filter for filtering the noise out of the speech and noise digital signal.
Mcarthur Dean
Reilly Jim
Research In Motion Limited
Sim & Mcburney
LandOfFree
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