I know this is very basic question and i am new to this site. But can anybody help me with my question. How to convert a sound file to other data format say using some type of transform (FFT or DFT) with which i can manipulate the data of the sound. Lets say i get frequency values from the sound i should be able to manipulate or compare these values to another sound file which is again converted to the same format so i can compare these two. Are there any algorithms to do this.