Apple has a sweet demonstration of video masking, scaling and changing perspective of the video.

苹果的例子，可以缩放和改变视频角度。

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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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