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・ Algebra of physical space
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Algebraic code-excited linear prediction
・ Algebraic combinatorics
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Algebraic code-excited linear prediction : ウィキペディア英語版
Algebraic code-excited linear prediction
Algebraic code-excited linear prediction (ACELP) is a patented〔US Patent 5717825 Algebraic code-excited linear prediction speech coding method 10th February 1998〕 speech coding algorithm by VoiceAge Corporation in which a limited set of pulses is distributed as excitation to a linear prediction filter.
The ACELP method is widely employed in current speech coding standards such as AMR, EFR, AMR-WB (G.722.2), VMR-WB, EVRC, EVRC-B, SMV, TETRA, PCS 1900, MPEG-4 CELP and ITU-T G-series standards G.729, G.729.1 (first coding stage) and G.723.1.〔(ACELP map ), VoiceAge Corporation, Archive.org〕〔(VoiceAge Corporation - related standards )〕 The ACELP algorithm is also used in the proprietary ACELP.net codec.
ACELP is a patented technology and registered trademark of (VoiceAge Corporation )〔(Trademarks )〕 in Canada and/or other countries and was developed in 1989 by the Université de Sherbrooke in Canada.〔(Transfer of technology )〕
==Features==
The main advantage of ACELP is that the algebraic codebook it uses can be made very large (> 50 bits) without running into storage (RAM/ROM) or complexity (CPU time) problems.

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