Real time implementation of MPEG-1 Layer III audio decoder with TMS320C6201 DSP

The goal of this research is the real-time implementation of MPEG-1 Layer III audio decoder using the fixed-point digital signal processor of TMS320C6201. The main job for this work is twofold: one is to convert floating-point operation in the decoder into fixed-point operation while maintaining the high resolution, and the other is to optimize the program to make it run in real time with memory size as small as possible. The implemented decoder uses 6.77 kWords of program memory, 3.13 kWords of data ROM and 9.94 kWords of data RAM, respectively. It also uses about 26% of maximum computation capacity of TMS320C6201. Comparing the PCM output of fixed-point computation with that of floating-point computation for test bit streams, we achieved the signal-to-noise ratio of more than 60 dB.