Home > High-pass filter
A high-pass filter passes 'high' frequencies fairly well, but attenuates 'low' frequencies. Therefore it is better called a low-cut filter or bass-cut filter. The term rumble filter is sometimes used. See also bandpass filter.
Hence it is useful as a filter to block any unwanted low frequency components of a complex signal whilst passing the higher frequencies. Of course, the meanings of 'low' and 'high' frequencies are relative. A high-pass filter is the opposite of a low-pass filter.
The simplest 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; its reciprocal is the cutoff frequency, at which the output voltage is 70.7% of the input.
Such a circuit would be used in combination with a tweeter and a loudspeaker.??
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Electronics
