@ARTICLE{Dymarski_Przemysław_Low_2020,
 author={Dymarski, Przemysław},
 volume={vol. 66},
 number={No 1},
 journal={International Journal of Electronics and Telecommunications},
 pages={69-76},
 howpublished={online},
 year={2020},
 publisher={Polish Academy of Sciences Committee of Electronics and Telecommunications},
 abstract={Code Excited Linear Prediction (CELP) algorithms are proposed for compression of speech in 8 kHz band at switched or variable bit rate and algorithmic delay not exceeding 2 msec. Two structures of Low-Delay CELP coders are analyzed: Low-delay sparse excitation and mixed excitation CELP. Sparse excitation is based on MP-MLQ and multilayer models. Mixed excitation CELP algorithm stems from the narrowband G.728 standard. As opposed to G.728 LD-CELP coder, mixed excitation codebook consists of pseudorandom vectors and sequences obtained with Long-Term Prediction (LTP). Variable rate coding consists in maximizing vector dimension while keeping the required speech quality. Good speech quality (MOS=3.9 according to PESQ algorithm) is obtained at average bit rate 33.5 kbit/sec.},
 type={Article},
 title={Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding},
 URL={http://ochroma.man.poznan.pl/Content/113746/PDF/10_2020.pdf},
 doi={10.24425/ijet.2019.130267},
 keywords={CELP, Low-Delay CELP, MP-MLQ, MOS, variable bit rate},
}