Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features

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概要

• 論文の詳細を見る

• 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 transformedbased 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.

• 社団法人電子情報通信学会の論文
• 2002-06-01

著者

• Lin R‐s

  Department Of Electrical Engineering National Cheng Kung University

• Lin Rong-san

  Department Of Electrical Engineering National Cheng Kung University

• Yang Jar-ferr

  Department Of Electrical Engineering National Cheng Kung University

• Hu Chung-rong

  Department Of Electrical Engineering National Cheng Kung University

• Lin Rong-san

  Department Of Computer Science And Information Engineering Southern Taiwan University

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