Abstract.-The principles of network synthesis may be applied to active networks to realize systems

whose transmission properties are dynamically variable. In the application of these principles to an

illustrative synthesis, feedback around integrators is employed to realize a system with a system-function

frequency-normalized by means of a variable gain K. The variation in bandwidth is automatically

controlled by voltages supplied to the control grids of pentodes. The bandwidth is dynamically-variable

over approximately four octaves with slight changes in midband gain of the system and slight variations

in selectivity. The selectivity may be preset to some nominal value by a potentiometer adjustment. The

illustration presented represents one general approach to the synthesis and physical realization of

slowly-variable transmission systems.

This material was shipped to Fenwick Library Special Collections, George Mason University, Fairfax, VA on Oct. 23, 2000. Hard copy publisher's reprint is available at Box 6 Folder 23 of Warfield Collection C0016, SCRC, George Mason University.