. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. REGENERATION THEORY 137 changes in the same direction with increasing w, where w is real, the rule can be stated as follows: The system is stable or unstable according to whether or not a real frequency exists for which the feed-back ratio is real and equal to or greater than unity. In case ddjdw changes sign we may have the case illustrated in Figs. 3 and 4. In these cases there are frequencies for which w is real and. W-PLANE Fig. 3—Illustrating case where amplifying
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. REGENERATION THEORY 137 changes in the same direction with increasing w, where w is real, the rule can be stated as follows: The system is stable or unstable according to whether or not a real frequency exists for which the feed-back ratio is real and equal to or greater than unity. In case ddjdw changes sign we may have the case illustrated in Figs. 3 and 4. In these cases there are frequencies for which w is real and. W-PLANE Fig. 3—Illustrating case where amplifying ratio is real and greater than unity for two frequencies, but where nevertheless the path of integration does not include the point 1, 0. greater than 1. On the other hand, the point (1, 0) is outside of the locus X = 0 and, therefore, according to the rule there is a stable Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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