measure distance between codebook and testing

i have a dataset consist of 375 wave file from 5 speakers(digit 1 to 5 repeated 15 times for each digit) . i already split the LPCC coefficient that i save in excel. 80%(300 file) of the wave file is the codebook and the rest(75) is for the training. how can i use simple distance measure to classify each class. to put it simple, the system will compare the testing with the codebook, and the minimum distance will give the classification.