Low delay sparse and mixed excitation celp coders for wideband speech coding
AbstractCode 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.
|Journal series||International Journal of Electronics and Telecommunications, [do 2009: Electronics and Telecommunications Quarterly], ISSN 2081-8491, e-ISSN 2300-1933, [0867-6747]|
|Publication size in sheets||0.5|
|License||Journal (articles only); author's original; ; after publication|
|Score||= 40.0, 15-07-2020, ArticleFromJournal|
|Publication indicators||= 0; : 2018 = 0.592|
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