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Type of analog linear filter with maximally flat group delay

Filters name is a reference to Friedrich Bessel , a German Mathematician

Also known as Thomson-Bessel

Bessel Filter

Equation

NA0A1A2A3A4A5A6A71112331315156141051054510159459454201051516103951039547251260210211

These are called reverse Bessel polynomials because their coefficients are reversed from the ordinary Bessel polynomials used to generate Bessel functions.

Coefficient of Bessel Polynomials

Schematic DiagramLow Pass Filter

High Pass Filter

Bessel Frequency Response

Application:

Used in Audio Crossover System