This paper describes a design method for optimum digital audio equalizers with small ringing impulse responses, associated with smooth frequency responses. The procedure benefits from superior order derivatives of the B-spline functions to reduce the ripples in the time domain and to ensure a natural audition. The B-splines will be grouped to generate the desired frequency responses, with improved interband independence and suppressed ringing of the impulse responses.

Keywords: Audio equalizers, Grouped B-spline functions, Smooth frequency response, Small ringing