Title :
Devices for controlling amplitude characteristics of telephonic signals
Author_Institution :
Bell Telephone Laboratories, Inc., New York, N. Y.
Abstract :
This paper describes a family of devices which automatically respond to signals and control the circuit amplification in such a way as to improve transmission. Their general characteristics are outlined, their differences explained, and some of their applications are listed.
Keywords :
Choppers (circuits); Gain; Noise; Propagation losses; Speech; Transducers; Voltage control;
Journal_Title :
Electrical Engineering
DOI :
10.1109/EE.1939.6431780
