Adaptive pitch pulse enhancer and method for use in a...

Details Adaptive pitch pulse enhancer and method for use in a... Adaptive pitch pulse enhancer and method for use in a...

G - Physics

10

L

G10L 19/12 (2006.01) G10L 11/06 (2006.01) G10L 19/00 (2006.01) G10L 9/00 (1990.01)

Patent

CA 2108623

ABSTRACT OF THE DISCLOSURE An adaptive pitch pulse enhancer and method, adaptive to a voicing measure of input speech, for modifying the adaptive codebook of a CELP search loop to enhance the pitch pulse structure of the adaptive codebook. The adaptive pitch pulse enhancer determines a voicing measure of an input signal, the voicing measure being voiced when the input signal includes voiced speech and the voicing measure being unvoiced when the input signal does not include voiced speech, modifies a total excitation vector produced by the CELP search loop in accordance with the voicing measure of the input signal, and updates the adaptive codebook of the CELP search loop by storing the modified total excitation vector in the adaptive codebook.

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