Speech processing is the computer understanding of the voice. It is the process of turning a speech signal into useful information for users. Speech processing is to turn continuous analog speech signal into discrete digital signal. It is about converting sound waves into information for machine reading. Speech processing is basically a sub-field of computer science that provides methods to convert speech signals into text or other useful data. The most common application of speech processing is to convert speech signals into textual data. In this case, speech processing deals mainly with modeling the speech signal and implementing a suitable speech recognition engine.