摘要
针对ISO标准算法并没有考虑可用比特数小于编码所需比特数的情况而不能实现编码音质的最佳化的问题,利用人耳对音频信号中的高频部分不敏感的感知特性,根据待编码音频信号各比例因子带的能量分布情况,提出了一种新的自适应比特分配策略。结果表明,与标准算法相比,文中算法在降低编码计算量的同时能有效提高编码主观音质。
The ISO standard algorithm doesn＇t take the situation into account that the available bits can＇t meet the need of encoding bits, thus it cannot achieve the optimal coding quality. According to the perceptive characteristic that human ear is not sensitive to the high frequency part of audio signal, a novel self-adaptive bit allocation method was proposed in this paper based on the energy distribution of scale factor bands in audio signals. Experimental results show that, compared with standard algorithm, the novel algorithm effectively improves the subjective coding quality and reduces calculation amounts at the same time.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第10期145-148,共4页
Journal of Wuhan University of Technology
基金
电子信息产业发展基金(财建[2008]329号)
河南省电力公司科学技术项目(2010年第1批第3类第14项)
武汉市创新人才基金(武人社函[2009]97号)
关键词
AAC
子带
自适应比特
AAC
factor band
self-adaptive bit
