Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding

• Autorzy: Dymarski Przemysław

Identyfikatory

DOI

10.24425/ijet.2019.130267

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

Low-Delay CELP; MP-MLQ; MOS; variable bit rate

• Wydawca: Polish Academy of Sciences, Committee of Electronics and Telecommunication
• Czasopismo: International Journal of Electronics and Telecommunications
• Rocznik: 2020
• Tom: Vol. 66, No. 1
• Strony: 69--76
• Opis fizyczny: Bibliogr. 22 poz., schem., tab., wykr.

Twórcy

autor

Dymarski Przemysław

• Warsaw University of Technology, Institute of Telecommunications, Poland

Bibliografia

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• [13] ITU-T, “Recommendation G.728, Coding of speech at 16 kbit/s using low-delay code excited linear prediction”, 2012.
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• [16] P. Dymarski, R. Romaniuk, "Modified Sphere Decoding Algorithms and their applications to some sparse approximation problems", Proc. 22nd European Signal Processing Conf. EUSIPCO 2014, Lisbon, DOI 10.5281/zenodo.43826
• [17] R. Rose and T. Barnwell “The self-excited vocoder - an alternate approach to toll quality at 4800 bps”. IEEE International Conference on Acoustics, Speech, and Signal Processing ICASSP '86.
• [18] P. Dymarski and N. Moreau. "Mixed excitation CELP Coder". Proc. European Conference on Speech Communication and Technology (EUROSPEECH'89), Paris 1989
• [19] ITU-T, “Recommendation G.723.1, Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s”, 2006.
• [20] ITU-T, „Recommendation P.862: Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs”, 2001.
• [21] K. Kim, “Wideband LD-CELP coder” – BS thesis WEiTI, Warsaw University of Technology, supervisor P. Dymarski, 2019
• [22] G. Kim, “Wideband speech coding using CELP algorithm” – BS thesis WEiTI, Warsaw University of Technology, supervisor P. Dymarski, 2019