本文介绍了一种简单的电子高通滤波器实现方式，该滤波器由串联在信号路径中的电容器与并联在信号路径中的电阻组成。通过调整电阻与电容器的值可以改变截止频率。
Implementation
A passive, analog, first-order high-pass filter, realized by an
RC circuit
The simplest electronic high-pass filter consists of a capacitor in series with the signal path in conjunction with a resistor in parallel with the signal path. The resistance times the capacitance (R×C) is the time constant (τ); it is inversely proportional to the cutoff frequency, at which the output power is half the input (−3 dB):
Where f is in hertz, τ is in seconds, R is in ohms, and C is in farads.
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