Non-ideal conditions in actual transaural reproduction, such as a slightly off-central listening position and reflections in the listening room, can impair the perfect reconstruction of binaural pressures and give rise to perceived timbre coloration. In the present work, a high-frequency band equalization method is proposed to further reduce the timbre coloration in transaural reproduction with two frontal loudspeakers. The high-frequency responses of a pair of transaural filters are equalized by a frequency-dependent factor so that the overall power spectra of the responses remain constant, and the low-frequency responses of transaural filters are kept intact. An analysis using Moore's revised loudness model indicates that the proposed method reduces the deviation between the binaural loudness level spectra in transaural reproduction and those of the target sound source. A further psychoacoustic experiment validates that the proposed method reduces the timbre coloration in transaural reproduction without introducing an obvious perceivable directional distortion for virtual source in the frontal quadrants of the horizontal plane.
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