Patent ID: 6260009
Filing Date: 2001-07-10
Classification: G10L

Abstract:
An apparatus for converting a compressed speech packet from one code excited linear prediction (CELP) format to another, comprising:a formant parameter translator that translates input formant filter coefficients having an input CELP format and corresponding to a speech packet to an output CELP format to produce output formant filter coefficients; andan excitation parameter translator that translates input pitch and codebook parameters having an input CELP format and corresponding to said speech packet to said output CELP format to produce output pitch and codebook parameters, wherein said excitation parameter translator comprises:a model order converter that converts the model order of said input formant filter coefficients from a model order of said input CELP format to a model order of said output CELP format;a time base converter that converts the time base of said input formant filter coefficients from a time base of said input CELP format to a time base of said output CELP format;a speech synthesizer that produces a target signal using said input pitch and codebook parameters and said output formant filter coefficients; anda searcher that searches for said output codebook and pitch parameters using said target signal and said output formant filter coefficients.