Method for real-time reduction of voice telecommunications noise

Details Method for real-time reduction of voice telecommunications noise Method for real-time reduction of voice telecommunications noise

1997-01-28

1998-01-13

MacDonald, Allen R.

395 234, 395 235, 395 236, 395 237, 395 242, G10L 302, G10L 900, G10L 506

Patent

active

057087547

ABSTRACT:
A telecommunications network service overcomes the annoying effects of transmitted noise by a signal processing which filters out the noise using interactive estimations of a linear predictive coating speech model. The speech model filter uses an accurate updated estimate of the current noise power spectral density, based upon incoming signal frame samples which are determined by a voice activity detector to be noise-only frames. A novel method of calculating the incoming signal using the linear predictive coating model provides for making intraframe iterations of the present frame based upon a selected number of recent past frames and up to two future frames. The processing is effective notwithstanding that the noise signal is not ascertainable from its source.

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