Implementing LPC (Linear Predictive Coding) Algorithms in the Study of Speech Processing.

This report describes a system which processes speech using linear predictive methods. The system is a software simulation of an LPC analyzer and synthesizer. The system consists of two programs, one of which processes the speech to generate the LPC parameters, and another which processes these parameters to resynthesize the speech. An important aspect of the system is that it enables the user to select from various pitch and coefficient analysis methods. It also allows the user to vary other parameters in order to simulate other changes in the processing scheme. To test the operation of the system, a regimen of testing was performed by varying the different parameters. A separate program allows a simple method for changing all of the parameters over which the user has control. These parameters are called the decision variables and each has an allowable range of values. The system operated satisfactorally over all values of the decision variables. The flexibility exhibited by the system in this testing indicates that the system can be a valuable tool for the study of linear predictive coding of speech in the Signal Processing Laboratory at the Air Force Institute of Technology. Author