Title :
Transistorized multifrequency ringing generator
Author :
Kostelich, J. F. ; Howald, B. W.
Author_Institution :
Lorain Products Corporation, Lorain, Ohio
Abstract :
The selective telephone party-line ringing system using mechanically tuned bells is relatively well known. A 5-party line, for example, may have phones with bells tuned to 20, 30, 40, 50, and 60-cycles, respectively. Introducing a 40-cycle ringing voltage to this party line will cause only the 40-cycle bell to ring.
Keywords :
Batteries; Generators; Harmonic analysis; Noise; Oscillators; Relays; Voltage control;
Journal_Title :
American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the
DOI :
10.1109/TCE.1960.6368504
