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Equalization of Audio Systems using Kautz Filters with Log-like Frequency Resolution

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This paper presents a new digital filtering approach to the equalization of audio systems such as loudspeaker and room responses. The equalization scheme utilizes a particular infinite impulse response (IIR) filter configuration called Kautz filters, which can be seen as generalizations of finite impulse response (FIR) filters and their warped counterparts. The desired frequency resolution allocation is attained by appropriately choosing a set of fixed Kautz filter poles. The frequency resolution mapping is characterized by the allpass part of the Kautz filter. The second step in the actual equalizer design consist of assigning the Kautz filter tap-output weights, which is more or less a standard least-square configuration. The proposed method is demonstrated using measured loudspeaker and room responses.

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