The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Neste artigo, propomos um vocoder simplificado baseado em transformação e de taxa variável, que evolui a partir da estrutura de codificação de predição linear excitada por código (CELP). Com filtros de pré-ênfase e de-ênfase, o vocoder CELP baseado em transformação incorpora um preditor de longo prazo, uma transformada discreta de cosseno (DCT) e pré-filtros e pós-filtros para obter quantização perceptualmente ponderada. O vocoder baseado em transformada proposto requer menos complexidade computacional com qualidade um pouco pior do que os codificadores CELP. Além disso, a estrutura de codificação proposta baseada em DCT, facilmente imaginada com coeficientes DCT adicionais, poderia oferecer simultaneamente taxas de bits baixas, médias e altas para adaptar a variação da largura de banda para a Internet moderna ou comunicações sem fio.
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Jar-Ferr YANG, Rong-San LIN, Chung-Rong HU, "Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features" in IEICE TRANSACTIONS on Information,
vol. E85-D, no. 6, pp. 1003-1014, June 2002, doi: .
Abstract: In this paper, we propose a simplified transform-based and variable-rate vocoder, which is evolved from the code-excited linear prediction (CELP) coding structure. With pre-emphasis and de-emphasis filters, the transformed-based CELP vocoder incorporates a long-term predictor, a discrete cosine transform (DCT), and pre-filters and postfilters for achieving perceptually weighted quantization. The proposed transform-based vocoder requires less computational complexity with slightly worse quality than the CELP coders. Furthermore, the proposed DCT-based coding structure easily figured with additional DCT coefficients could simultaneously offer low, middle, and high bit rates to adapt the variation of bandwidth for modern Internet or wireless communications.
URL: https://global.ieice.org/en_transactions/information/10.1587/e85-d_6_1003/_p
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@ARTICLE{e85-d_6_1003,
author={Jar-Ferr YANG, Rong-San LIN, Chung-Rong HU, },
journal={IEICE TRANSACTIONS on Information},
title={Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features},
year={2002},
volume={E85-D},
number={6},
pages={1003-1014},
abstract={In this paper, we propose a simplified transform-based and variable-rate vocoder, which is evolved from the code-excited linear prediction (CELP) coding structure. With pre-emphasis and de-emphasis filters, the transformed-based CELP vocoder incorporates a long-term predictor, a discrete cosine transform (DCT), and pre-filters and postfilters for achieving perceptually weighted quantization. The proposed transform-based vocoder requires less computational complexity with slightly worse quality than the CELP coders. Furthermore, the proposed DCT-based coding structure easily figured with additional DCT coefficients could simultaneously offer low, middle, and high bit rates to adapt the variation of bandwidth for modern Internet or wireless communications.},
keywords={},
doi={},
ISSN={},
month={June},}
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TY - JOUR
TI - Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features
T2 - IEICE TRANSACTIONS on Information
SP - 1003
EP - 1014
AU - Jar-Ferr YANG
AU - Rong-San LIN
AU - Chung-Rong HU
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E85-D
IS - 6
JA - IEICE TRANSACTIONS on Information
Y1 - June 2002
AB - In this paper, we propose a simplified transform-based and variable-rate vocoder, which is evolved from the code-excited linear prediction (CELP) coding structure. With pre-emphasis and de-emphasis filters, the transformed-based CELP vocoder incorporates a long-term predictor, a discrete cosine transform (DCT), and pre-filters and postfilters for achieving perceptually weighted quantization. The proposed transform-based vocoder requires less computational complexity with slightly worse quality than the CELP coders. Furthermore, the proposed DCT-based coding structure easily figured with additional DCT coefficients could simultaneously offer low, middle, and high bit rates to adapt the variation of bandwidth for modern Internet or wireless communications.
ER -