Signal enhancement for voice coding

G - Physics – 10 – L

Patent

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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.

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