Although these methods can control and reduce the noise in most measurements, some techniques just prevent noise from entering the system, whereas others remove only extraneous noise from the signal.
虽然这些方法在大多数测量中能控制和减少噪声，但是一些技术只是防止噪声进入系统，而其他只是去除信号中的外来噪声。
Signal Station SEM abeam on port side. We are entering the canal at transit speed of 8 knots.
左舷正横信号站已过，我们船正以过运河的8节速度驶入运河。
The system takes the pressure signal of hydraulic micro-adjust of the four rollers mill for signal of steel plate entering into rolling mill and signal of steel plate out of rolling mill.
这种长度测量系统利用四辊轧机液压微调计算机厚度控制系统的压力检测信号，作为咬钢和抛钢识别信号。
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