Abstract
We present an improved codebook search algorithm in this paper. We call it thedouble test of principal components(DTPC). This algorithm speeds up the codebook search by searching only an appropriate sub-codebook instead of the whole set of codewords. Moreover, DTPC inherits several benefits from some previous techniques, such as the double test (DT) and the principal component analysis (PCA). Thus DTPC is much more efficient than the other algorithms. Simulation results confirm this efficiency. According to these results, the total number of the mathematical operations needed in DTPC is usually less than that needed in any other method, even if the MSE degradation of DTPC is limited within 0.13 dB. Furthermore, in some cases, this number of DTPC is only 3% of that in a full search.
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