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A Binaural Model with Head Motion That Resolves Front-Back Confusions for Analysis of Room Impulse Responses

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Front-back confusions occur in both psychoacoustic localization tests and interaural cross-correlation-based binaural models. Head motion has been hypothesized and tested successfully as a method of resolving such confusions. The ICC-based model set forth here simulates head motion by filtering test signals with a trajectory of HRTFs and shifting an azimuth remapping function to follow the same trajectory. By averaging estimated azimuths over time, the correct source location prevails while the front-back reversed location washes out. This model algorithm is then extended to room impulse response analysis. The processing is performed on simulated binaural impulse responses at the same position but different head angles. The averaging allows the model to discriminate reflections coming from the front from those arriving from the rear.

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