Telecommunications speech signal improvement by reduction of res

Details Telecommunications speech signal improvement by reduction of res Telecommunications speech signal improvement by reduction of res

1995-05-31

1998-01-06

Safourek, Benedict V.

395 235, 395 242, G10L 900

Patent

active

057063940

ABSTRACT:
A telecommunications network service overcomes the annoying effects of transmitted noise by signal processing which filters out the noise using a model-based iterative signal estimator. The estimator is provided with a current estimate of the noise power spectral density, using signal frame samples determined by a voice activity detector to be noise-only frames. The signal estimator makes intra-frame iterations of the current frame while using smoothing across LSP parameters of adjacent frames, recent past frames, and up to two contiguous future frames. Non-stationary noise created by the iterative filtering is further reduced in one or more post-filtering stages that use knowledge of the nature of the low level non-stationary noise events.

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