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An Efficient 20-Band Digital Audio Equalizer

Digital audio equalizers can be efficiently implemented using frequency domain techniques, which make use of computationally intensive filter design algorithms, in order to reduce the circular convolution to a pure linear convolution operation. This paper studies the difference between these two operations and presents a few optimization solutions in order to reach high selectivities and to simplify the frequency approximation to an arbitrary equalization curve, while ensuring total inaudibility of the allowed but highly attenuated aliased signal components.

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