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High-Pass Filter

An electronic filter used in various audio circuits to attenuate all frequencies below a chosen frequency.
high-pass filter

A high-pass filter (HPF) is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. The amount of attenuation for each frequency depends on the filter design. A high-pass filter is usually modeled as a linear time-invariant system. It is sometimes called a low-cut filter or bass-cut filter. High-pass filters have many uses, such as blocking DC from circuitry sensitive to non-zero average voltages or radio frequency devices. They can also be used in conjunction with a low-pass filter to produce a bandpass filter.

In the optical domain, high-pass and low-pass have the opposite meanings, with a "high-pass" filter (more commonly "long-pass") passing only longer wavelengths (lower frequencies), and vice-versa for "low-pass" (more commonly "short-pass").

High-pass and low-pass filters are also used in digital image processing to perform image modifications, enhancements, noise reduction, etc., using designs done in either the spatial domain or the frequency domain. The unsharp masking, or sharpening, operation used in image editing software is a high-boost filter, a generalization of high-pass.

Key Terms

amount attenuation
certain cutoff frequency
cutoff frequency
electronic filter
frequency
high pass
high pass filter
hpf
signals
signals frequencies

Additional Resources

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Acronymn

HPF

Synonymns

High-Pass Filter
(none found)

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Sources & Credits

Last modified on June 23 2019
Content adapted from Wikipedia
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