A transistorized compandor

The application of multiple-channel communication circuits as provided by carrier and microwave radio systems has been steadily increasing in recent years in the attempt to satisfy the widespread consumer demands, public, private, and military included, for more and better telecommunication facilities. The use of these systems has solved many problems of expansion; however, in turn, the systems have introduced their own problems, in particular the increased susceptibility to interference, crosstalk, and noise as compared to physical voice frequency circuits.