Rapid development of a real-time speech coder on a TMS320C54x DSP

This paper describes a rapid implementation of a real-time voice compression (codec) on a DSP processor for voice over Internet Protocol (VoIP) gateways and applications. Voice codec algorithms such as G.723.1 are complex, hence they take many manhours to implement in real-time. By identifying control flow and dataflow, and applying iterative refinement of a C reference source code, we are able to obtain real-time implementation on a 100 MIPS TMS320C5402 digital signal processing (DSP) starter kit (DSK) in three man-months only. At current implementation, the encoder and decoder use 70 MIPS and 6 MIPS, respectively. They occupy 26 Kword program memory and 17 Kword data memory.