A New Approach to Digital Audio Equalization

The design and implementation of a M-band linear phase digital audio equalizer system is presented. Beginning from analysis/synthesis filterbank, an innovative uniform and non uniform bands audio equalizer is derived using multirate properties. In literature fixed frequency response equalization has well-known problems due to algorithms implementation. The idea of this work derives from different techniques employed in filter banks to avoid aliasing in the case of adaptive filtering in each band. The effectiveness of the algorithm is shown comparing it with a simple filterbank and with an octave band equalizer based on frequency domain technique. The solution presented here has several advantages in terms of linear phase and uniform frequency response avoiding ripple between adjacent bands.