无用信号（unwanted signal）可能损害有用信号接收的信号。首先它是一种信号，即携带信息的时变电磁现象。其次它是有可能损害有用信号，也就是说，只是一种电磁现象，并未形成后果。
中级质量工程师考试理论与实务考点7 ... 电磁噪声 electromagnetic noise 无用信号 unwanted signal，undesired signal 干扰信号 interfering signal ...
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试验结果表明，该方法可以有效地抑制无用信号，具有较高的识别精度。
Experimental results showed that this method can decrease void signals and improve the accuracy of identification.
最后介绍了分选预处理器在电子战中的三种应用：威胁信号检测、无用信号滤波和脉冲重复频率选择滤波。
At last, the paper also presents three different applications of the sorting processor to electronic warfare: detection of threating signal, filtering of useless signal and PRF selection filtering.
电噪音-本质上是任何无用的信号-可以有各种来源。
Electrical noise - essentially any unwanted signal - can arise from a number of sources.
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