| MPEG-2音频解码算法优化 |
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| 引用本文： | 赵永刚,唐昆,崔慧娟,杜文,杨铭.MPEG-2音频解码算法优化[J].电声技术,2003(12):10-12,22. |
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| 作者姓名： | 赵永刚 唐昆 崔慧娟 杜文 杨铭 |
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| 作者单位： | 清华大学,电子工程系微波与数字通信国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金(69972020)，国家基础研究项目(G1998030406). |
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| 摘 要： | 以PC机为硬件平台对MPEG-2的音频解码算法进行优化，实现MPEG-2全软件的系统、视频、音频3个部分实时解码。在IDCT和IMDCT中应用了新的快速算法；结合PC机本身的特点及解码过程中有大量的乘加运算采用SIMD(single—instruction multiple—data)来对程序优化，并在实际运算中也对数据结构进行了优化。通过以上的优化使MPEG-2层Ⅱ解码的运算量减少了40％以上，在奔腾3／450计算机上只占用不到5％的系统资源。这些优化算法已经应用于奔腾3／800为硬件平台的MPEG-2实时解码器中。
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| 关 键 词： | MPEG-2 音频解码 SIMD 离散余弦反变换 修正离散余弦反变换 单指令多数据 |
Optimization of MPEG-2 audio decoding algorithm |
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| ZHAO Yong-gang,TANG-Kun,et.al..Optimization of MPEG-2 audio decoding algorithm[J].Audio Engineering,2003(12):10-12,22. |
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| Authors: | ZHAO Yong-gang TANG-Kun etal |
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| Abstract: | This paper presents an optimized audio algorithm of MPEG-2decoding with an Intel Pen-tium PC platform under Window's OS.The novel fast IDCT,IMDCT transform algorithms are adopted,and combined with the characteristics of Intel Pentium PC the single-instruction multiple-data(SIMD)techniques are applied in operations such as multiplication,addition and etc.Furthermore,the opti-mized data structure have been adopted in practical optimization procedure.With all these optimization methods,the audio decoding of MPEG-2layer2can decrease more than40%operations and expenses less than5%system resource of PIII450.These optimized algorithms have been applied in a MPEG2real time coding under a PentiumIII800platform. |
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| Keywords: | audio decode algorithm optimization inverse discrete cosine transform(IDCT) inverse modified discrete cosine transform(IMDCT) single-instruction multiple-data(SIMD) |
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