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[1]张 涛,要 强,陈存彪,等.AC-3 编码器中的高效比特分配算法[J].天津大学学报(自然科学版),2009,(12):1096-1100.
 ZHANG Tao,YAO Qiang,CHEN Cun-biao,et al.High Efficient Algorithm of the Bit Allocation in AC-3 Encoder[J].Journal of Tianjin University,2009,(12):1096-1100.
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AC-3 编码器中的高效比特分配算法()
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《天津大学学报(自然科学版)》[ISSN:0493-2137/CN:12-1127/N]

卷:
期数:
2009年12
页码:
1096-1100
栏目:
电子信息工程
出版日期:
2009-12-15

文章信息/Info

Title:
High Efficient Algorithm of the Bit Allocation in AC-3 Encoder
文章编号:
0493-2137(2009)12-1096-05
作者:
张 涛要 强陈存彪李 海全浩军
天津大学电子信息工程学院,天津 300072
Author(s):
ZHANG TaoYAO QiangCHEN Cun-biaoLI HaiQUAN Hao-jun
School of Electronic Information Engineering,Tianjin University,Tianjin 300072,China
关键词:
AC-3编码器比特分配信噪比偏移量
Keywords:
AC-3 encoderbit allocationsnroffest
分类号:
TN919.3
文献标志码:
A
摘要:
基于对信噪比偏移量的定量分析,得出待分配比特数与信噪比偏移量之间的理论估算公式,从而能够有效逼近信噪比偏移量的最佳值.在此基础上提出了一种基于一次逼近和收敛控制的高效比特分配算法,分别以迭代次数和剩余比特2 个参数来衡量比特分配的效率和精度.实验结果表明,该算法所需的平均搜索次数约为传统算法的71.4%,使得AC-3编码器比特分配的精度和效率均有明显提升.
Abstract:
In this paper,based on the quantitative analysis of the snroffset,a formula which can estimate the relation between the volume of bit allocation and the volume of snroffset was obtained. By employing this formula,the optimal value of snroffset can be approached effectively. Based on the deduction,a high efficient algorithm of the bit allocation by one rough approaching and the convergence control was proposed. The accuracy and efficiency of bit allocation were measured by the times of iteration and the value of bitleft,respectively. Experimental results show that the average search times are only about 71.4% of those of the traditional algorithm.This algorithm can greatly enhance both the accuracy and efficiency of the bit allocation in AC-3 encoder.

参考文献/References:

[1] Painter T,Spanias A. Perceptual coding of audio signals [J]. Proceeding of IEEE,2000,88(4):451-513.
[2] Advanced Television System Committee. ATSC52 Digital Audio Compression Standard(AC-3)[S]. USA. 1995- 12-20.
[3] Todd C,Davidson G,Davis M,et al. AC-3:Flexible perceptual coding for audio transmission and storage[C]// Proc 96th Conv Aud Eng Soc. Amsterdam, Netherland, 1994.
[4] 刘 硕.AC-3 编码器的理论分析和计算结构设计 [D].天津:天津大学电子信息工程学院,2007. Liu Shuo. The Theoretic Analysis and Computing Structure Design of AC-3 Encoder [D]. Tianjin:School of Electronic Information Engineering,Tianjin University, 2007 (in Chinese) .
[5] 葛力雅.AC-3 编码算法研究与DSP 上的实现[D]. 天津:天津大学电子信息工程学院,2007. Ge Liya. Research on AC-3 Encoder Algorithm and Realization on DSP [D]. Tianjin:School of Electronic Information Engineering,Tianjin University,2007 (in Chinese).
[6] 李 欣.AC-3 编码器研究与实现[D]. 天津:天津大学电子信息工程学院,2008. Li Xin. The Research and Realization of AC-3 Audio Encoding Algorithms [D]. Tianjin:School of Electronic Information Engineering,Tianjin University,2008 (in Chinese) .
[7] Liu Chi Min,Lee Szu Wei,Lee Wen Chieh. Bit allocation method for AC-3 encoder [J]. IEEE Transactions on Consumer Electronics,1998,44(2):883-887.
[8] 张 涛,国澄明. AC-3 音频编码标准中比特分配算法的研究[J]. 测控技术, 2004, 23(增):197-200. Zhang Tao,Guo Chengming. Research on bit allocation algorithm in AC-3 standard [J]. Measurement and Control Technology,2004,23(Suppl):197-200 (in Chinese).
[9] Jean F R,Long C F,Hwang T H, et al. Two-stage bit allocation algorithm for stereo audio coder [J]. IEEE Proceedings on Image Signal Process,1996,143(5): 331-336.
[10] Ramprashad S A. Sparse bit-allocations based on partial ordering schemes with application to speech and audio coding [J]. IEEE Transactions on Audio,Speech,and Language Proceeding,2007,15(1):57-69.

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备注/Memo

备注/Memo:
收稿日期:2008-10-14;修回日期:2009-04-14.
基金项目:工业与信息化部2009电子行业发展基金资助项目(工信部财(2008)192 号);天津市自然科学基金资助项目(06YFJMJC00700);广东省教育部产学研结合项目(2009B090600112).
作者简介:张 涛(1975— ),男,博士,副教授.
通讯作者:张 涛,zhangtao@tju.edu.cn.
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