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 - 4AAC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.
本文介绍了国家标准中内燃机噪声测试对声学测试环境的要求，提出了内燃机噪声实验室建设的指标。
This paper introduces the requirements for sound testing environment by the national standards for engine noise testing and proposes the targets for the construction of engine noise laboratories.
其次，介绍了MP3音频压缩标准所使用的子带编码、心里声学模型、自适应窗口切换、哈夫曼编码、比特池等关键技术。
Secondly, introduces MP3 audio compress standard including subband filter bank, psychoacoustic model, adaptive window switch over, Huffman coding, bit reservior, etc.
其次，介绍了MP3音频压缩标准所使用的子带编码、心里声学模型、自适应窗口切换、哈夫曼编码、比特池等关键技术。
Secondly, introduces MP3 audio compress standard including subband filter bank, psychoacoustic model, adaptive window switch over, Huffman coding, bit reservior, etc.
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