... calculated and related in the way explained in section 2 in order to obtain the transform function fT. With these relations, the curve appearing in Figure 8 is obtained, under the minimum square error ... never intersect in a point but in an area that induces to an approximation, and thus, to an error (uncertainty) in the localization point. The intersection of two circles (as shown in Figure 3) ... HRTFs in time, frequency, and space. J. Audio Eng. Soc., Vol. 49 , No .4, (April, 2001), pp. 231- 248 , ISSN 1 549 -49 50 Coen M. (1998). Design principles for intelligent environments, Proceedings...