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.
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 foundation of Dolby AC- 3 real-time decoder.
出处
《安徽师范大学学报（自然科学版）》
CAS
北大核心
2009年第3期234-238,共5页
Journal of Anhui Normal University(Natural Science)
基金
安徽省高校自然科学研究项目(KJ2009B296Z)
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
high definition television （HDTV）
bit allocation
inverse modified discrete cosine transform （IMDCT）
masking effect
