CARRIER DETECTION CIRCUIT

摘要

Carrier detection circuit for use with an FSK modem receiver wherein a pair of phase lock circuits connected to the receiver are tuned to provide output voltage upon receipt of either a mark or space signal, and a third phase lock circuit connected to the receiver is tuned to provide an output voltage upon receipt of a mark signal. These voltages are applied to a Schmitt trigger to provide a carrier detect output voltage to digital utilization equipment.