. The Bell System technical journal . Z21 Z11Z21 -Ro. Q 12 ^ ^ )^ a -z Z||=^Ro ^ ^ ^ ^ ^ ^ y^ ^ eo+* ^ ^ ^ ^ ^ / eo ,^ ^ ^ X ^ ^ ^ ^ , ^ eo-* ^ ^ ^ oooFig. 8—Variable equalizers with varying reference characteristics. A third simple network is shown on Fig. 9. Its properties are theconverse of those secured from the structures of Fig. 8. The referenceloss, ^0, is now a constant, while ip varies with frequency in a manner 3 See, for example, Distortion Correction in Electrical Circuits, O. J. Zobel,Bell Sys. Tech. Jour., July, 1928. 240 BELL SYSTEM TECHNICAL JOURNAL which depends upon the c

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. The Bell System technical journal . Z21 Z11Z21 -Ro. Q 12 ^ ^ )^ a -z Z||=^Ro ^ ^ ^ ^ ^ ^ y^ ^ eo+* ^ ^ ^ ^ ^ / eo ,^ ^ ^ X ^ ^ ^ ^ , ^ eo-* ^ ^ ^ oooFig. 8—Variable equalizers with varying reference characteristics. A third simple network is shown on Fig. 9. Its properties are theconverse of those secured from the structures of Fig. 8. The referenceloss, ^0, is now a constant, while ip varies with frequency in a manner 3 See, for example, Distortion Correction in Electrical Circuits, O. J. Zobel,Bell Sys. Tech. Jour., July, 1928. 240 BELL SYSTEM TECHNICAL JOURNAL which depends upon the choice of Z. An additional control of 0 canof course be obtained by the introduction of an auxiliary structure infront of the variable resistance. As in the previous example, theillustrative curves are drawn on the assumption that the characterizing sa^Ro

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1