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。

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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.

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。

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And the new patent licensing policy introduced by MPEG-4 is considered to be too harsh and unacceptable. Many such reasons urgently need a new audio video coding standard to be introduced.

而MPEG - 4出台的新专利许可政策被认为过于苛刻无法接受，诸多此类原因都迫切需要一种新的视频编码标准出台。

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But Dolby claims its newly introduced Advanced Audio Coding standard does it better.

FORBES: Aural Surgery