This paper presents an 8 kbps low delay CELP coding scheme which has a one way delay less than 5 ms. In the proposed scheme, we classify the analyzed speech as either voiced or unvoiced segment. An adaptive pitch excitation codebook is used to generate voiced speech while a Gaussian stochastic codebook is used to generate unvoiced speech. To eliminate the roughness of synthetic speech without affecting the pitch dynamics, we propose a new long-term prediction algorithm to smooth the pitch contour in the voiced speech segment. Closed-loop excitation gain adaptation is employed to make the coding scheme more robust.<>


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    Title :

    Low delay CELP coding at 8 kbps using classified voiced and unvoiced excitation codebooks


    Contributors:
    Chui, S.P. (author) / Chan, C.F. (author)


    Publication date :

    1994-01-01


    Size :

    307904 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Low Delay CELP Coding at 8kbps Using Classified Voiced and Unvoiced Excitation Codebooks

    Chui, S. P. / Chan, C. F. / IEEE; Hong Kong Chapter of Signal Processing | British Library Conference Proceedings | 1994


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