Pitch detection for use in a predictive speech coder

Details Pitch detection for use in a predictive speech coder Pitch detection for use in a predictive speech coder

1988-02-12

1990-05-08

Clark, David L.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 49, G10L 908, G10L 702

Patent

active

049245082

ABSTRACT:
A pitch detector to adjust long term prediction in a pulse excitation speech coder. A residual signal r(n) is first derived from the speech signal s(n) by short term filtering. Then, r(n) is processed to calculate a prediction error signal e(n) which is subsequently pulse excitation encoded. The processing of e(n) entails prediction of a residual by measuring a pitch related factor M, employing two steps. First calculating a coarse M value through peak clipping and sign transition detection, and then adjusting the M value by autocorrelation--calculations about the roughly spaced peaks.

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J. Le Roux et al., "A Fixed Point Computation of Partial Correlation Coefficients", IEEE Trans. ASSP, vol. ASSP-25, No. 3 6/77, pp. 257-259.

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