Patent
1995-10-31
1997-12-09
MacDonald, Allen R.
395 21, 395 217, 395 223, 395 271, 395 291, G10L 914
Patent
active
056968752
ABSTRACT:
A speech signal is sampled to form a sequence of speech data. The sequence of speech data is segmented into overlapping segments. Speech coefficients are generated by fitting each segment to a nonlinear predictive coding equation. The nonlinear predictive coding equation includes a linear predictive coding equation with linear terms, and additionally includes at least one cross term that is proportional to a product of two or more of the linear terms. If the segment is voiced, a sinusoidal term is included in the nonlinear predictive coding equation and sinusoidal parameters are generated. Otherwise, a noise term is included in the nonlinear predictive coding equation. The speech coefficients, a voiced bit, and, if the segment is voiced, the sinusoidal parameters are included as compressed speech data.
REFERENCES:
patent: 5557159 (1996-11-01), Shoham
"Voice Processing", Gordon E. Pelton, McGraw-Hill, Inc., pp. 52-67.
"Advances In Speech And Audio Compression", Allen Gersho, Proceedings of the IEEE, vol. 82, No. 6, Jun. 1994, pp. 900-918.
Le et al. "Speech Enhancement Using Non-Linear Prediction." TENCON '93, 1993 IEEE Region 10 Conf. Computer, Communication, 1993.
Labun Nicholas M.
Pan Shao Wei
Wang Shay-Ping Thomas
Collins Alphonso A.
MacDonald Allen R.
Motorola Inc.
Pickens S. Kevin
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