Equalizers are hardware or software-based filters used to adjust the frequency content of an audio signal. Common types of equalizers include graphic, parametric, and semi-parametric. Most equalizers combine several filters allowing adjustment of more than one frequency band. Filter shapes include high-pass, low-pass, band-pass, bell-shaped, and shelving. Analog equalizers may use active or passive circuitry and digital equalizers may utilize minimum phase or linear phase algorithms.
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