. The Bell System technical journal . K = 10Fig. 3—Two dimensional = 10 K=13 Fig. 4—Three dimensional alphabets. COMPARISON OF 8IGNALLING ALPHA HKTS .) 1 <) when fi is the rms dislaiuc from llie origin lo tiic points of u fonfiguru-tioii .1, Ri) is the distance fioni tho origin to the centroid of A, and r-zis the nns distance from the i)oints of A to the centroid of A. In plotting points on the efhciency graph the notation A, 1) is usedfor the best K-letter D-dimensional alphabet which has been arrangement of points for various A, 2 and A, 3 alphabets is given inFigs.
. The Bell System technical journal . K = 10Fig. 3—Two dimensional = 10 K=13 Fig. 4—Three dimensional alphabets. COMPARISON OF 8IGNALLING ALPHA HKTS .) 1 <) when fi is the rms dislaiuc from llie origin lo tiic points of u fonfiguru-tioii .1, Ri) is the distance fioni tho origin to the centroid of A, and r-zis the nns distance from the i)oints of A to the centroid of A. In plotting points on the efhciency graph the notation A, 1) is usedfor the best K-letter D-dimensional alphabet which has been arrangement of points for various A, 2 and A, 3 alphabets is given inFigs. 3 and 4. In these hgures two points are joined by a straight lineif the distance between them is 1 (which is the value we have adoptedfor the minimum allowed separation 2/-()). Although not shown, the originis always at the centroid of the hgure. To aid interpretation of thesediagrams we have included Fig. 5 which demonstrates how all the signalsof a typical alphabet can be generated. The functions of time shown in
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
