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

The goal of this research is the real-time implementation of an MPEG-1 Layer III audio decoder using the TMS320C6201 fixed-point digital signal processor (DSP). The main jobs for this work are twofold: one is to convert the floating-point operation in the decoder into a fixed-point operation while maintaining high resolution, and the other is to optimize the program to make it run in real time with a memory size that is 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 the maximum computation capacity of the TMS320C6201. Comparing the PCM (pulse code modulation) output of the fixed-point computation with that of the floating-point computation for test bit streams, we achieved a signal-to-noise ratio (SNR) of more than 60 dB.