Closed circuit television apparatus for remotely controlling television cameras

摘要

A closed circuit television apparatus for a supervisory system comprises at least one imaging device which includes a remote- controllable television camera for generating video signals, a monitor receiving the video signals and displaying images corresponding to the received video signals, and a controller for generating composite control signals to control the television camera. The composite control signals have a higher frequency than that of the video signals. The imaging device further includes a receiver receiving the composite control signals, extracting the composite control signals by utilizing the difference in frequency between the received composite control signals and the video signals, and operating the television camera based on the extracted composite control signals.