High-pass filter
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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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