Efficient algebraic code-excited linear predictive codebook search

S. M. Tsai, J. F. Yang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


To reduce the computational complexity of algebraic code-excited linear prediction (ACELP) coders, an efficient codebook search mechanism based on a simplified correlation matrix (SCM) of the vocal impulse response is proposed. In the proposed approach, the statistical characteristics of the vocal impulse response are identified such that only a small proportion of the total number of correlation coefficients in the correlation matrix need be calculated before the ACELP search procedure is carried out. Furthermore, the proposed joint scheme, by combining the SCM method and a pulse position prediction scheme, not only decreases the arithmetic complexity in the pre-computing autocorrelation matrix but also reduces the number of pulse position combinations. The simulation and experimental results show that the proposed method provides an effective reduction in the computational load of the ACELP codebook search procedure with no discernible degradation of the speech quality.

Original languageEnglish
Pages (from-to)761-768
Number of pages8
JournalIEE Proceedings: Vision, Image and Signal Processing
Issue number6
Publication statusPublished - 2006 Dec 6

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering


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