Patent
1995-05-03
1997-06-24
Safourek, Benedict V.
395 228, 395 271, G10L 500
Patent
active
056424647
ABSTRACT:
In methods and apparatus for processing a speech signals comprising a plurality of successive signal intervals, each signal interval containing no speech sounds is classified as a noise interval, and LPC coefficients are calculated for each noise interval based on the samples of that noise interval and on the samples of a plurality of preceding signal intervals. When noise intervals encoded using LPC coefficients calculated as described above are reconstructed, the subjectively annoying "swishing" or "waterfall" effects encountered in conventional LPC speech processing systems are reduced or eliminated.
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"Convergence and Numerical Sensitivity of Backward-Adaptive LPC Predictors", Chen et al, Proc. IEEE Workshop on Speech Coding for Telecommunications, 1993, pp. 83-84.
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Rabipour Rafi
Yue H.S. Peter
Junkin C. W.
Northern Telecom Limited
Safourek Benedict V.
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