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Comparison of Inverse Filter Real-Time Equalization Methods for Non-Minimum Phase Loudspeaker Systems

Three time domain digital inverse filter design techniques are considered for non-minimum phase loudspeaker systems equalization, namely: FIR filter obtained with adjustable modeling delay, IIR filter followed by "excessphase" compensation and warped filter also followed by "excess-phase" compensation. Off-line inverse filtering results using real measured impulse responses of loudspeaker systems are compared and discussed for each design technique on the basis of the time equalization error, similar response’s magnitude flatness, phase linearity and filter order. Real-time inverse filter implementations requirements on a real set-up, using a digital signal processor of the Texas Instruments TMS320 family are also compared based on computational load and memory needs. Results show that loudspeaker equalization with an inverse IIR filter followed by "excess-phase" compensation appears as a good compromise solution

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