초록 ▼

A circuit for communicating both a video signal and a timing signal over a single information channel from a television camera head to a remote camera control unit. A horizontal interval timing signal is modified by delaying the beginning of each timing pulse so that each pulse is shortened in durat

A circuit for communicating both a video signal and a timing signal over a single information channel from a television camera head to a remote camera control unit. A horizontal interval timing signal is modified by delaying the beginning of each timing pulse so that each pulse is shortened in duration by a fixed amount. This modified timing signal is added to a video signal such that the portion of the sum signal which corresponds to the modified timing signal has a distinctive amplitude which is outside of the range of amplitudes established by the white and black levels of the video signal. At the camera control unit, a circuit separates the modified timing signal from the sum signal and synchronizes a multi-phase oscillator therewith through use of a phase locked loop. The original timing and video signals are reconstructed through logical operations which use selected phases of the oscillator.

대표청구항 ▼

In a television camera system wherein a camera head generates at least one video signal and a timing signal, with said at least one video signal comprising regularly occurring video information intervals containing information representing a video image and blanking intervals separating said video i

In a television camera system wherein a camera head generates at least one video signal and a timing signal, with said at least one video signal comprising regularly occurring video information intervals containing information representing a video image and blanking intervals separating said video information intervals, said blanking intervals each containing at least one time slot having a reference signal level therein, and with said timing signal comprising a periodic train of pulses occurring in timed relation to said blanking intervals of said at least one video signal, where said timing and video signals are to be communicated over a multichannel transmission link to a remote camera control unit, apparatus for communicating said video and timing signals over only a single channel of said multichannel transmission link, comprising: modifying means for modifying the pulses of said timing signal so as to provide a periodic modified signal which may be additively combined with said video signal without altering said video information or said reference signal level; combining means for additively combining said modified signal and said video signal so as to provide a sum signal having a periodic portion with a distinctive amplitude and corresponding in time to said modified signal; transmitting means for transmitting said sum signal to said camera control unit over a single communication channel; pulse stripping means at said camera control unit responsive to said periodic distinctive portion of said sum signal for regenerating said modified signal therefrom; and, reconstructing means at said camera control unit responsive to said sum signal and to said regenerated modified signal for reconstructing said video and timing signals therefrom.