A Simple Voice Scrambler using the TMS320C6x DSK

A simple voice scrambling scheme is implemented on the TMS320C6211 DSK as an Undergraduate research project. The approach makes use of basic and simple algorithms for filtering and modulation. With voice as input, the resulting DSK output is scrambled voice. The original unscrambled voice is recovered when the DSK output is used as the input to another DSK running the same identical program. Using an up-sampling scheme to process at a sampling rate of 16 kHz in lieu of the 8 kHz rate set on the DSK, a better performance allowing for a wider input signal bandwidth is achieved. This project was implemented on the TMS320C31-based DSK1 as a mini-project requirement in a Senior Elective course: Introduction to DSP (it was also implemented on the TMS320C252) without using up-sampling. EE students at the University of Massachusetts Dartmouth implements this scheme with MATLAB in a Junior Linear Systems course