Fixed frequency response audio equalization has well-known problems due to algorithms computational complexity and to filters design techniques. This paper describes the design and real time implementation of a $M$-band linear phase digital audio equalizer. Beginning from multirate systems and filterbanks, an innovative uniform and non uniform bands audio equalizer is derived. The idea of this work arises from different approaches employed in filterbanks to avoid aliasing in the case of adaptive filtering in each band. The effectiveness of the real time implementation is shown comparing it with a frequency domain equalizer. The solution presented here has several advantages in terms of linear phase and uniform frequency response avoiding ripple between adjacent bands.
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