描述
现场模拟量信号经A／D转换后变成离散的数字信号，然后将形成的数据按时间序列存入PLC内存。再利用数字滤波程序对其进行处理，滤去噪声部分获得单纯信号，可对输入信号用m次采样值的平均值来代替当前值，但井不是通常的每采样。次求一次平均值，而是每采样一次就与最近的m－l次历史采样值相加，此方法
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