介绍了人耳生理系统和掩蔽效应的特性，并阐述了视音频压缩标准MPEG1音频部分的心理声学模型。
By analyzing human physiological audio system and its masking effect, this paper illustrates the psychoacoustic model in audio part of the ISO video coding standard MPEG1.
对声调的声学特征进行分析，得出调值的具体变化值，为普通话的测评和教学提供一个可供参考的标准。
The analysis for the tone's acoustic characteristics helps us gain the tone's accurate variations which can be used as a referendal standard for Putonghua's estimation and teaching.
根据MPEG - 4 AAC编码标准及对算法的基本原理的分析研究，算法优化的关键点在于心理声学模型、滤波器组和量化等模块。
We research on MPEG-4 AAC encoding standards and the algorithm principium. The key point is optimizing the psychoacoustic model module, filter Banks module and quantizer module.
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