CIRCUIT FOR PRODUCING CHANNEL CARRIER FREQUENCIES, AUXILIARY PILOT FREQUENCIES, SYSTEM CARRIER FREQUENCIES AND SYSTEM CARRIER-CONTROL FREQUENCIES FOR MULTICHANNEL CARRIER CURRENT TELEPHONE INSTALLATIONS WITH PREMODULATION SYSTEM

摘要

The circuit comprises a basic oscillator, a combination of frequency dividers connected at the output of the basic oscillator, amplifiers connected at the output of the frequency dividers, or a filter connected at the output of said dividers, also modulators connected at the output of the amplifiers or a modulator connected to the filters and filters connected at the output of the modulators as well as channel carrier frequency outputs.