它是一种类似的多普勒频移的效应，就像救护车在你面前驶过时，会促使逐渐靠近你的警报器明显地改变其音调那样。
A similar effect, called the Doppler shift, causes the siren of an approaching ambulance to apparently change pitch as it passes you.
介绍了三维虚拟声音的特性、传播模型，分析了多普勒频移的原理和效应模型。
The characteristic, transmission model of 3d Virtual Sound is introduced. The Doppler effect is discussed.
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