Cost-effective implementation of ITU-T G.723.1 on a DSP chip
Sangmin Lee, Sangil Park, Yonngbeom Jang · 2002
This paper presents a full-duplex, real-time implementation of ITU-T G.723.1 speech coder using the SSP1820, Samsung's DSP chip which is based on a 16-bit fixed-point Oak core. Optimization methods are proposed in order to reduce the total cycle time consumed in real-time implementation. The multi-pulse maximum likelihood quantization (MP-MLQ) excitation search block which is the most computation-intensive block in the coder is restructured to reduce the algorithmic redundancy. In addition, efficient filtering methods and memory management are utilized for further optimization. The bit-exact verification with the ITU test vectors and performance evaluation aspects are also discussed in this paper.