Speech coder and method having spectral interpolation and...

G - Physics – 10 – L

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G10L 19/12 (2006.01) G10L 19/08 (2006.01) G10L 19/00 (2006.01) G10L 9/10 (1995.01)

Patent

CA 2103785

A novel spectral interpolation (500, 600) and efficient excitation codebook search method (700) developed for a Code-Ex- cited Linear Predictive (CELP) speech coder (100) is set forth. The interpolation is performed on an impulse response of the spec- tral synthesis filter. As the result of using this new set of interpolation parameters, the computations associated with an excitation codebook search in a CELP coder are considerably reduced. Furthermore, a coder utilizing this new interpolation approach pro- vides noticeable improvement in speech quality coded at low bit-rates.

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