The background noise of the reconstructed image is resulted from the nonnegative coded function. A method of constructing composite hologram for reducing the background noise is proposed.
对于编码函数非负给物体的再现像带来的背景噪音。提出采用构造复合全息图的方法来消除。
Rock wool has good absorption function for medium and low frequency noise and various types of vibration noise. This will be very favorable for reducing noise and improving work environment.
尤其对中低频和各种振动噪声均有良好的吸收效果，十分有利于减少噪音污染，改善工作环境。
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