| HDTV音频解码系统算法优化及实现 |
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| 引用本文： | 杨杰,郭立.HDTV音频解码系统算法优化及实现[J].安徽师范大学学报(自然科学版),2009,32(3):234-238. |
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| 作者姓名： | 杨杰 郭立 |
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| 作者单位： | 芜湖信息技术职业学院,电子信息系,安徽,芜湖,241003;中国科学技术大学,电子科学与技术系,安徽,合肥,230026;中国科学技术大学,电子科学与技术系,安徽,合肥,230026 |
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| 基金项目： | 安徽省高校自然科学研究项目 |
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| 摘 要： | Dolby AC-3是杜比实验室的第三代感知音频编解码系统,将心理声学模型溶入其中,大大地提高了编解码性能.本文介绍了Dolby AC-3音频标准解码算法的基本原理,并通过C程序实现该解码算法.详细推导了用两个N/4点的DCT-II来实现N点的改进离散余弦反变换(IMDCT)解码单元的优化算法,将此AC-3解码算法进行仿真试验,对仿真结果进行主客观评价.评价结果显示解码速度得到提高,为AC-3解码器的实时实现奠定了基础.
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| 关 键 词： | 高清晰度电视 比特分配 改进离散余弦反变换 掩蔽效应 |
Optimiztion and Realization for HDTV Audio Decoding Algorithm |
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| YANG Jie,GUO Li.Optimiztion and Realization for HDTV Audio Decoding Algorithm[J].Journal of Anhui Normal University(Natural Science Edition),2009,32(3):234-238. |
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| Authors: | YANG Jie GUO Li |
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| Institution: | YANG Jie1,2,GUO Li2 (1.Department of Electronic , Information,Wuhu Vocational Institute of Information , Technology,Wuhu 241003,China,2.Department of Electronics Science , Technology,University of Science , Technology of China,Hefei 230026,China) |
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| Abstract: | Dolby AC-3 is the third edition perceptual audio coding and decoding system.The basic principle of ATSC HDTV audio decoder is introduced in this paper.The algorithm of audio decoder was implemented by C program.This paper deduces an optimized algorithm for the IMDCT.The type of two N/4 point DCT-IIs is adopted in the optimized algorithm.Through computer simulation,the objective and subjective assessments are made to the results of simulation.Our simulation demonstrates that this has established the foundati... |
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| Keywords: | high definition television(HDTV) bit allocation inverse modified discrete cosine transform(IMDCT) masking effect |
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