Title:
CELP TRANSCODING
Document Type and Number:
WIPO Patent Application WO2000048170
Kind Code:
A9
Abstract:
A method and apparatus for CELP-based to CELP-based vocoder packet translation. The apparatus includes a formant parameter translator and an excitation parameter translator. The formant parameter translator includes a model order converter and a time base converter. The method includes the steps of translating the formant filter coefficients of the input packet from the input CELP format to the output CELP format and translating the pitch and codebook parameters of the input speech packet from the input CELP format to the output CELP format. The step of translating the formant filter coefficients includes the steps of converting the model order of the formant filter coefficients from the model order of the input CELP format to the model order of the output CELP format and converting the time base of the resulting coefficients from the input CELP format time base to the output CELP format time base.
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Inventors:
DEJACO ANDREW P
Application Number:
PCT/US2000/003855
Publication Date:
September 07, 2001
Filing Date:
February 14, 2000
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
G10L19/14; G10L19/12; H03M7/30; H03M7/36; H04B14/04; (IPC1-7): G10L19/14
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