Many common multimedia signal processing, including cropping, filtering, and perceptual coding, make watermark signal fading-like modification.
许多通常的多媒体信号处理，如剪切、滤波、感知编码等，引起了水印信号衰落状的偏倚。
A simple method of digital filtering which applies to processing linear, continuous and slow changing signal is introduced.
介绍了一种处理被测信号为线性、连续、缓慢变化的较为简单的数字滤波方法。
A mathematic model is built after analyzing various kinds of digital filtering and processing the signal of sensor.
然后分析了各种数字滤波方法的特点，针对传感器信号的特点进行处理，并建立了数学模型。
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