Appendix B. Average Det Curves
To show the procedure of constructing average DET curves, three speakers are used as an example. Figure B.1 shows three dotted curves and one solid curve. Each dotted curve represents the receiver operation characteristic (ROC) of a speaker model, and the solid curve is their average. First, interpolation is applied to obtain a common set of abscissa for all dotted curves. As a result, points on Curve A have coordinates (x1, yAl), (x2, yA2 ), (x3, yA3), …, (XN, yAN ); points on Curve B have coordinates (xl, yB1), (x2, yB2), (x3, yB3), …, (XN, yBN); and points on Curve C have coordinates (x1, yC1 ), (x2, yC2), (x3, yC3), …, (xN, yCN). Next, the ordinates are averaged for each common abscissa value to obtain the averaged ...
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