System and method for performing predictive scaling in computing

Details System and method for performing predictive scaling in computing System and method for performing predictive scaling in computing

1995-11-13

1997-09-30

MacDonald, Allen R.

395 225, 395 226, 395 233, 395 234, G10L 914

Patent

active

056733615

ABSTRACT:
A system and method for calculating linear predictive coding (lpc) coefficients in response to a received speech signal waveform. The system of the present invention uses a method referred to as the FLAT method for computing the lpc coefficients. The FLAT method involves computing 10 lpc filter coefficients and proceeds in a succession of iterations, wherein the 10 filter coefficients are derived in part from 10 reflection coefficients. According to the present invention, the method determines or predicts a scaling factor and, during each iteration, applies the scaling factor to the matrix terms prior to storage of the data while the full precision value is still available internally. Thus the present invention maintains full precision for the speech data during the computation. The scale factor prediction method of the present invention is most effective for high power voiced speech where the greatest loss of precision occurs using prior art post-storage scaling techniques.

REFERENCES:
patent: 4544919 (1985-10-01), Gerson
patent: 4817157 (1989-03-01), Gerson
patent: 4847906 (1989-07-01), Ackenhusen
patent: 4896361 (1990-01-01), Gerson
ICASSP 82 Proceedings, May 3, 4, 5, 1982, Palais Des Congres, Paris, France, Sponsored by the Institute of Electrical and Electronics Engineers, Acoustics, Speech, and Signal Processing Society, vol. 2 of 3, IEEE International Conference on Acoustics, Speech and Signal Procesing, pp. 651-654.

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