四极声源(30)一种分成四部份而相位交替振动的噪音源。
Quadrupole source (30) a noise source in which four parts vibrate alternately in phase.
此方法减小了相位离散值引起的量子化噪音，它适用于制作一切球面和非球面的具有旋转轴对称的相息图。
The method reduces the noise caused by discrete phase on reconstructing imago. This method can apply to either spherical or aspherical kind of Kinoform with axial rotating symmetry.
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