文章讨论了有源滤波器在偶极子声波测井仪器中的应用，并详细介绍了常用的有源高通、低通滤波器电路的参数设计与调试方法。
The paper introduces the application of active filters in the instrument, as well as the parameter design of the lo-pass and hi-pass filters.
反相器响应低通滤波器的大于或者小于阈值电平的输出，输出处于高或低电平的信号。
An inverter responses the output of a level greater than or smaller than a threshold value of the low pass filter, and outputs a signal in a high level or a low level.
以标称化的低通滤波器为例，给出有关的算法公式，这些公式经变换后可推广应用于非标称化的低通、高通及带通滤波器。
Taking nominal low-pass filter for example, presents necessary algorithmic formulae which can extend to non-nominal low-pass, high-pass and band-pans filters after some transformation.
在信号处理中选用具有低噪声、高精度、低功耗放大器ad620作为前置放大器，并以高、低通滤波器和工频陷波器清除干扰信号。
During signal processing, choosing low noise, high-precision, low-power amplifier AD620 as a pre-amplifier, and high-and low-pass filter and the frequency notch filter removal of interfering signals.
在信号处理中选用具有低噪声、高精度、低功耗放大器ad620作为前置放大器，并以高、低通滤波器和工频陷波器清除干扰信号。
During signal processing, choosing low noise, high-precision, low-power amplifier AD620 as a pre-amplifier, and high-and low-pass filter and the frequency notch filter removal of interfering signals.
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