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Robustness of Acoustic Crosstalk Cancellation as a Function of Frequency and Loudspeaker Separation

The condition number of the matrix of electroacoustic head-related transfer functions (HRTFs) in a two-channel sound reproduction system has been used as a measure of robustness of the Atal-Schroeder crosstalk canceller. A comparative study has been made using results produced by computer simulations and HRTFs measured in an anechoic chamber by means of a dummy head. It has been found that acoustic scattering by the head has a very important and beneficial influence on robustness, especially for large loudspeaker separations. For narrow loudspeaker separations of less than about 40 degrees, it has been found that crosstalk cancellation exhibits a large variation of alternating between very low and very high robustness. Simulations and measurements have also been made of the natural channel separation under the same conditions. Scattering by the head seems to provide a good level of natural channel separation at high frequencies and large loudspeaker angles. At low frequencies or small loudspeaker angles, natural channel separation is poor.:

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