A versatile parametric filter using an imbedded all-pass sub-filter to independently adjust bandwidth, center frequency, and boost or cut

The design of a versatile parametric digital filter is presented. Design equations are given to obtain specified cut/boost over a desired bandwidth. The definition of bandwidth for cut and boost filters is addressed, and the bandwidth options are described in terms of constant or variable 3-dB widths relative to cut/boost level.<<ETX>>