摘要
给出一种基于多任务嵌入式应用的MP3实时解码系统设计方法及实现过程。该系统针对以ARM926EJ-S处理器为核心的SoC硬件平台,通过对MP3解码过程中的关键耗时模块进行算法优化,提高解码效率,达到实时播放的要求。实验结果证明,该系统可在处理器主频仅为36 MHz的条件下流畅播放MP3音乐(码率为192 kb/s)。该设计特点为根据子带合成滤波中乘法运算的数据特征,巧妙地对操作数进行预移位操作,从而在保证一定数据精度的基础上缩短乘法运算的指令周期,实现解码效率的大幅度提升。提出一种利于高效任务调度的实时播放方案,对于高实时性、低功耗多任务嵌入式系统设计具有很好的参考意义。
The Paper Presents the design method and implement process of a kind of MP3 real- time decoding system based on the embedded application of multi- task. Aimed at the SOC platform of ARM926EJ - S core, this system optimizes the algorithm of the critical modules in the MP3 decoding process,improves the efficiency of decoding and fit the demand of real-time playing. The result of experiment indicates that this system can play MP3 music （bit - rate 192 kb/s） fluently with only 36MHz main frequency of processor. The innovative design has the following point：in accordance with the multiplication of the data features in sub - band filtering, cleverly p reshifting operands, thus on the basis of ensuring the certain accuracy of data, shorten the cycle of multiplication instructions and greatly increased the decoding efficiency, presents a real- time playing strategy, applicable for efficient task scheduling, which has a good reference value for the multi-task embedded system design with high real - time performance and low - power.
出处
《现代电子技术》
2008年第4期29-31,34,共4页
Modern Electronics Technique
关键词
多任务
MP3
ARM
算法优化
实时播放
multi - task
MP3
ARM
algorithm optimization
real - time playing
