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应用科学学报

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一种快速精确的多媒体反量化算法

戴麟;杨军;范志翔   

  1. 东南大学 国家专用集成电路系统工程技术研究中心，南京 210096
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-03-20 发布日期:2007-03-20

A Fast and Precise Multimedia Inverse Quantization Algorithm

DAI Lin;YANG Jun;FAN Zhi xiang   

  1. National ASIC System Research Center, Southeast University, Nanjing 210096, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-03-20 Published:2007-03-20

被引次数

1

摘要： 考虑了定点SOC芯片的处理能力、存储空间限制，提出一种查找表和定点泰勒级数展开相结合的方法逼近非线性函数，并给出加速收敛的方法，用6阶泰勒级数展开就可以得到很高的精度.实验结果表明，需要存储空间减小为完全查找表法的15%，误差减小为Tsung-Han Tsai提出的改进查表法的33%.

关键词: 片上系统, 定点, 转换, 泰勒级数

Abstract: Nonlinear functions are essential in multimedia systems, but they are difficult to be implemented in fixed point SOC. In this paper, a method combining a lookup table and Taylor series is proposed to approximate nonlinear functions by considering the ability of fixed point SOC and the limitation of memory. In addition, a fast convergent method is presented to improve precision by only taking sixth order Taylor series. Experiments show that the proposed method needs less memory compared with the full lookup table method, and can greatly improve precision compared to the method proposed by Tsung Han Tsai [1]

Key words: SOC, fixed point, conversion, Taylor series