增强型AAC+编码器中立体声参数的量化算法优化研究

Research on Algorithm Optimization for Parameter Quantization in Parametric Stereo in Enhanced AACPlus

参数立体声技术是将立体声下混为单声道并提取表征空间声像的参数来降低编码码率。本文通过对参数立体声的编码方案及其参数的量化方法进行研究,提出一种更符合人耳感知特性的参数量化新方法。实验结果表明,在同等音质下该算法可以有效降低原参数立体声的参数码率。

Parametric stereo is a method by downmixing stereo to single-channel and extracting spatial parameters that respect location information of spatial sound field.This paper studies the coding scheme and the parameters quantization method in parametric stereo coding and proposes a new parameters quantization method which is more suit for binaural perceptual characteristic.Experimental results show that this method can bring down the parametric bitrate compared with parametric stereo,while maintaining the objective and subjective sound quality.