Receiving apparatus for messages with in-band signals

摘要

Receiving apparatus for a message occupying a message frequency band which simultaneously may include noise, and includes one or more unmodulated or amplitude-modulated double-sideband constant-frequency carriers with or without carrier suppression as periodic signals, which uses sampling and reconstruction circuits to deliver the message substantially free from the periodic signals, and to deliver each periodic signal substantially free from noise, the message and any other periodic signal present in the message frequency band.