Code excited linear predictive vocoder using virtual searching

Details Code excited linear predictive vocoder using virtual searching Code excited linear predictive vocoder using virtual searching

G - Physics

10

L

354/47

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

Patent

CA 1336455

Apparatus for encoding speech using an improved code excited linear predictive (CELP) encoder using a virtual searching technique to improve performance during speech transitions such as from unvoiced to voiced regions ofspeech. The encoder compares candidate excitation vectors stored in a codebook with a target excitation vector representing a frame of speech to determine the candidate vector that best matches the target vector by repeating a first portion of each candidate vector into a second portion of each candidate vector. For increased performance, a stochastically excited linear predictive (SELP) encoder is used in series with the adaptive CELP encoder. The SELP encoder is responsive to the difference between the target vector and the best matched candidate vector to search its own overlapping codebook in a recursive manner to determine a candidate vector that provides the best match. Both of the best matched candidate vectors are used in speech synthesis.

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