Before revision: The transfer function of the Bessel filter is a rational function whose denominator is a reverse Bessel polynomial, such as the following: The reverse Bessel polynomials are given by: where Setting the cutoff attenuation There is no standard set attenuation value for Bessel filters , however, .
After revision: The transfer function of the Bessel filter is a rational function whose denominator is a reverse Bessel polynomial, such as the following: The reverse Bessel polynomials are given by: where Setting the cutoff attenuation There is no standard set attenuation value for Bessel filters .