Closed circuit television apparatus with a remote control television camera

Claim 1

A closed circuit television apparatus comprising: a remote-controllable television camera including an image pick-up device for generating a video signal; a plurality of controlling devices each including an operating means for generating a plurality of control signals to control said television camera, and a displaying means for receiving the video signal and displaying a picture corresponding to the received video signal; and a distributing device for connecting said displaying means of the respective controlling devices to the television camera to distribute the video signal outputted from said television camera to the respective controlling devices; said operating means including a circuit for generating a plurality of composite signals each composed of two signals having different frequencies commensurate with the kind of control, a circuit for generating a carrier signal having a frequency higher than the frequency of the video signal, and a circuit for modulating the carrier signal by the composite signal, and outputting the control signals to a circuit portion connecting said distributing device to said displaying means; said television camera further including a driving means for receiving the control signals, said driving means including a filter for extracting a modulated carrier signal outputted from said driving means, a decoder for demodulating the composite signal from the extracted signal and for outputting a signal corresponding to a demodulated signal, a driver for actuating said television camera, and a controller for controlling said driver based on the signal outputted from said decoder; said distributing device including a main circuit portion connected to a transmission line, a plurality of branching circuit portions branching off from said main circuit portion and individually connected to said displaying means, at least one processing circuit having input and output terminals and disposed in one of said main circuit portion and said branching circuit portions, so that the input and output terminals of said processing circuit are disposed at a television camera side and a controlling device side, respectively, said processing circuit outputting the video signal and preventing the control signals from being outputted therefrom, and a plurality of bypass circuits having input and output terminals and connecting across said main circuit portion and said branching circuit portions so as to bypass said processing circuit, so that the input and output terminals of said bypass circuits are disposed at each of the television camera side and the controlling device side, respectively, said bypass circuits outputting the control signals and preventing the video signal from being outputted therefrom.