The plant electrical signal is a kind of complicated signal, and the traditional electrophysiological method couldn't get more useful message from it.
植物电波信号是一种相当复杂的信号，应用传统的电生理方法，已不能获取更多有用信息。
In the real signal processing, the signal we get always contains lots of noise. In order to get the useful message from the signal with noise, we must use some methods to de-noise in the message.
在实际信号处理过程中，采集到的信号包含大量噪声，为了提取含噪信号中的有用信号，必须采用某种方法将噪声从信号中滤除。
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