A new method of selecting initial codebook and distortioncriterion is presented to improve the efficiency of SOFM neural network according to the statistic feature of PCA transformational coefficient.

• 实验证明，与普通PCA+SOFM连续编码算法和基本SOFM算法相比，这种混合编码算法由于占用存储空间少，因而降低了码书设计的计算量，并改善了码书的性能。