Summary

We first wrote a program that finds all the 8-bit *.wav files and then wrote another program to calculate sub for pairs in each file and save the result. After that we calculated average of subs for each file. Certainly average of modified data was less than original data, so we decided to have a threshold. if average of a file is less than this threshold we'll assume that this file is embedded and classify files by their average. (Because some original files have small average and sub and in comparison with files with large sub and average may cause mistakes.)
You can see some averages in the *.excel file which is uploaded in pervious post.Now we should find suitable threshold for each pair in each class and then find out whether the file is exactly embedded or not.