The condition number of the matrix of electro-acoustic head-related transfer functions (HRTF) in atwo-channel sound reproduction system has been used as a measure of robustness of the Atal-Schroedercrosstalk canceler. A comparative study has been made using results produced by computer simulationsand HRTFs measured in an anechoic chamber by means of a dummy head. It has been found thatacoustic scattering by the head has a very important and benecial inuence on robustness, speciallyfor large loudspeaker separations. For narrow loudspeaker separations of less than about 40 degreesit is found that crosstalk cancellation exhibits a large variation of alternating very low and very highrobustness. Also, simulations and measurements have been made of the natural channel separation underthe same conditions. Scattering by the head is seen to provide a good level of natural channel separationat high frequencies and large loudspeaker angles. At low frequencies or small loudspeaker angles naturalchannel separation is poor.
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