一种简单易行的替代方法是信号差异噪声比（ signal difference to noise ratio ， SDNR ），它使用原始数据的信号差值来取代对显示 影像对比度的评估，表达式为： SDNR=(SA - SB)...
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Obviously, the dynamic threshold is to use quasi-peak level that, while the signal to noise ratio is expressed with the quasi-average levels, and the difference is obvious in.
显见，动态阈是用准峰值电平表示，而信噪比则是用准平均值电平表示的，两者的区别是显而易见的了。
The time frequency difference between grain noise and defect signal provide a possibility for enhancement of signal-to-noise ratio (SNR) in ultrasonic testing.
晶粒噪声和缺陷信号的时频特征的差异，为提高超声检测的信噪比提供了可能。
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