提出了在低成本SoC平台的软件优化策略，包括基于统计分析的浮点到定点转换策略和面向性能优化的片上存储器容量定制策略，在此基础上针对计算密集性应用提出了完整的优化方法。通过实现MPEG-4 AAC实时解码，表明该优化策略在性能和成本方面的有效性。这一策略与方法也适合其他DSP应用。

This paper proposes software optimization strategies using a low-cost SoC which include float-point to fix-point conversion scheme based on statistical analysis and performance oriented customizing scheme for on-chip memory's capacity,  and presents optimization methodology based on these strategies for computation intensive applications.  the MPEG-4 AAC decoding in real-time is implemented as a case study to illustrate the efficiency of the proposed optimization strategy in both performance and cost.  The strategy and methodology also can be used to optimize other DSP applications.