Speech coder employing analysis-by-synthesis techniques with...

Details Speech coder employing analysis-by-synthesis techniques with... Speech coder employing analysis-by-synthesis techniques with...

G - Physics

10

L

G10L 19/12 (2006.01) G10L 19/10 (2006.01) G10L 19/00 (2006.01) G10L 9/14 (1990.01)

Patent

CA 2120902

SPEECH CODER EMPLOYING ANALYSIS-BY-SYNTHESIS TECHNIQUES WITH A PULSE EXCITATION ABSTRACT In an analysis-by-synthesis coder, the original speech signal undergoes small time shifts to match in time the signal to be coded with the replica reproduced by the long-term synthesis filter. The shift is determined at each subframe by an exhaustive search within a range of possible values so at to minimize the error signal energy. Once the optimal shift has been determined, the optimal excitation is searched for. The excitation is chosen in a codebook containing words with very few pulses arranged in a deterministic structure, which words are all obtained from a limited number of key words. The deterministic codebook structure allows a fast search for the optimal excitation, without need of storing the codebook and actually performing the synthesis filterings of the candidate excitations.

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