An improvement of the processing delay for the g.723.1 vocoder

  • Authors:

  • Kwang Hyoung Lee;So Yeon Min;Keun Wang Lee;Jeong Gyu Jee

  • Affiliations:

  • Dept. of Internet Information, Seoil College;Dept. of Information & Telecommunication, Seoil College;Dept. of Multimedia Science, Chungwoon Univ.;Korea Research Foundation, Korea

  • Venue:
  • MMM'07 Proceedings of the 13th International conference on Multimedia Modeling - Volume Part II
  • Year:
  • 2007

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Abstract

This paper develop the complexity reduction schemes of real root method that is mainly used in the CELP (Code Excited Linear Prediction) vocoder. The real root method is that if polynomial equations have the real roots, it is able to find those and transform them into LSP (Line Spectrum Pairs). Proposed algorithm is developed by using Mel scale and is to reduce the LSP complexity That is, the searching interval is arranged by using Mel scale but not it is uniform. In experimental results, complexity of the developed algorithm is reduced about 46% in average, but the transformed LSP parameters of the proposed method were the same as those of real root method. Hence, in case of applying proposed algorithm in G.723.1 (6.3kbps MP-MLQ), the speech quality is no distortion compared to original speech quality.