Transform-based CELP vocoders with low-delay low-complexity and variable-rate features

Jar Ferr Yang, Rong San Lin, Chung Rong Hu

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1003-1014
Number of pages12
JournalIEICE Transactions on Information and Systems
Issue number6
Publication statusPublished - 2002 Jun

All Science Journal Classification (ASJC) codes

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence

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