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Evaluation of Inverse Filtering Techniques for Room/Speaker Equalization

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Inverse filtering has been proposed for numerous applications in audio and telecommunications, such as speaker equalization, virtual source creation and room deconvolution. When an impulse response (IR) is non-minimum phase, its corresponding inverse can produce artifacts that become distinctly audible. These artifacts produced by the inverse filtering can actually degrade the signal rather than improve it. The severity of these artifacts is affected by the characteristics of the filter and the method (time or frequency domain) used to compute its inverse. In this paper, objective and subjective tests were conducted to investigate and highlight the potential limitations associated with several different inverse-filtering techniques. The subjective tests were conducted in compliance with the ITU-R MUSHRA method.

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