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

This paper describes a rapid implementation of realtime voice compression (codec) on 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 data flow, 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 Ut (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.