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high-pass filter
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acoustic filters typically used in air-handling systems
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high-pass filter

acoustics
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acoustic filters typically used in air-handling systems
acoustic filters typically used in air-handling systems Figure 3: Acoustic filters typically used in air-handling systems. (A) and (B) Low-pass filters; (C) a high-pass filter; (D) a band-pass filter, which actually filters out vibrations within a narrow frequency range (see text).

A high-pass filter is an electrical circuit that allows only frequencies above a specific limit to pass through. In acoustics, this concept is applied to sound. A high-pass filter in sound systems is designed to remove or attenuate low frequencies while allowing higher frequencies to pass.12

This is often achieved in air ducts by inserting openings or a series of openings. These features create an impedance mismatch that reflects unwanted low frequencies, effectively filtering them out. This type of acoustic filtration is used in applications such as some automobile mufflers to reduce noise.2

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  1. high-pass filter
  2. sound - Acoustic filtration

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