多缓冲机制下ADPCM解码算法适应性研究  

Study of ADPCM decoder algorithm's adaptability based on multi-buffer mechanism

作　　者：凌晨[1] 韩江洪[1,2] 马学森[1,2] 毕翔[1,2] 

机构地区：[1]合肥工业大学计算机与信息学院,安徽合肥230009 [2]合肥工业大学安全关键工业测控技术教育部工程研究中心,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2009年第8期1125-1127,1141,共4页Journal of Hefei University of Technology：Natural Science

基　　金：高等学校博士学科点专项科研基金资助项目(20070359028);广东省教育部产学研结合资助项目(2008B090500226)

摘　　要：文章对不同缓冲机制下ADPCM解码算法的运行条件进行了分析与对比,利用最小二乘法,提出关于ADPCM解码函数输入数据量与函数输入缓冲区长度的条件关系式,量化了不同缓冲机制对算法适应性的影响;针对实验环境的特点,改进了IMA ADPCM解码算法。研究结果表明,采用多缓冲机制能显著提高ADPCM算法的适应性;改进后的解码算法效率较原算法提高约75%。In this paper, the operation conditions of the ADPCM decoder algorithm in different buffer mechanisms are analyzed and compared. The formulas of the input data length and the input buffer length of the ADPCM decoder are deduced with the least-squares method. The formulas are used to quantize the effects of different buffer mechanisms on the application of the ADPCM decoder algorithm. Then the improvement of the IMA ADPCM decoder algorithm is proposed according to the characteristics of SCM. Experiments show that the multi-buffer mechanism can significantly improve the adaptability of the ADPCM algorithm. The validity of the formulas is verified in C8051F330 SCM environment, and the efficiency of the improved algorithm increases by about 75M.

关 键 词：自适应差分脉冲调制 多缓冲机制 解码 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论]