PURPOSE: A Karhunen-Loeve transform (KLT) based domain switch split vector quantization method and an apparatus are provided to use a the KLT based SVQ apparatus and algorithm, thereby reducing an abnormal signal distortion part of the domains which is caused by the interaction between the KLT domain and an original domain. CONSTITUTION: A KLT domain converter (101) converts an inputted audio signal vector into a small sized sub-block. The KLT domain converter outputs a KLT vector signal by the KLT conversion of the converted audio signal vector. A first quantizing device (120) compares each of the values of the inputted audio signal vector with the codes of each code book and prints out the nearest code book. A second quantizing device (103) compares each of the values of the KLT vector with the codes of each code book and prints out the nearest code book. A final code book determiner (105) compares the code vector which is quantized in an original domain and the KLT domain of the audio signal, respectively, and selects the nearest code vector. [Reference numerals] (101) KLT domain converter; (104) Inverse KLT domain converter; (105) Final code book determiner
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