Definition

Noun: A high-pass filter is an electronic circuit or signal processing function that allows signals with a frequency higher than a specific cutoff frequency to pass through with minimal reduction, while it significantly weakens or blocks signals with frequencies lower than that cutoff point.

Usage

A high-pass filter is used to remove unwanted low-frequency components or noise from a signal. It is a fundamental concept in audio engineering, telecommunications, and image processing. * In an audio system, a high-pass filter might be used to remove low-frequency rumble from a recording. * The engineer applied a high-pass filter to the microphone signal to reduce wind noise. * This circuit diagram shows a simple RC high-pass filter.

Advanced Usage

• Slope/Roll-off: This refers to how sharply a high-pass filter attenuates frequencies below the cutoff, typically measured in decibels per octave (dB/octave) or decibels per decade (dB/decade). A steeper slope more aggressively removes low frequencies.
• Cutoff Frequency (-3dB point): The specific frequency at which the filter's output power is reduced to half (-3 decibels) of its input power. It is the standard point for defining the filter's passband edge.

Variants and Related Words

• HPF: A common abbreviation for high-pass filter.
• Low-pass filter: The complementary filter that passes frequencies a cutoff and attenuates those above it.
• Band-pass filter: A filter that passes frequencies within a specific range and attenuates frequencies outside that range.
• Filter (general): A broader term for any device or process that removes unwanted components from a signal.

Synonyms

• Bass-cut filter (common in audio contexts)
• Low-cut filter (common in audio contexts)

Antonyms

• Low-pass filter

Related Technical Terms

• Attenuation: The reduction in strength of a signal.
• Passband: The range of frequencies that are allowed to pass through the filter with minimal attenuation.
• Stopband: The range of frequencies that the filter significantly attenuates or blocks.

Noun

1. a filter that passes frequencies above a certain value and attenuates frequencies below that value