low-pass filter
acoustics
Quick Summary
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 low-pass filter is an electric circuit that allows frequencies below a specific limit to pass through while blocking higher frequencies. In acoustics, this principle is applied to sound waves. Changes in the cross-sectional area of air ducts, such as widening or narrowing, can create an impedance mismatch that reflects higher sound frequencies, effectively acting as a low-pass filter. This is utilized in systems like air-handling units and automobile mufflers to reduce unwanted high-frequency noise.12
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