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电子学报  2014 

正弦参数自适应联合量化

DOI: 10.3969/j.issn.0372-2112.2014.04.027, PP. 798-803

Keywords: 高速率原理,正弦编码,匹配追踪,自适应联合量化

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Abstract:

为实现音频信号的低速率编码,提出一种正弦参数量化的新方案.该方案利用人耳掩蔽效应和实时参数统计特性,基于高速率原理建立并显式求解率失真优化问题,得到具有解析形式的参数量化器,实现了在正弦分量间和正弦参数间动态分配编码比特.本量化方案无迭代运算过程,适合实时低速率音频编码应用.与经典方法比较,平均比特速率每正弦减少约17%.当速率大于15bit/正弦,重建信号的感觉失真小于球形量化方案.

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