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Abstract

A video transmission system and method including a technique for deriving clock information in a receiver from a transmitted analog video signal to decipher digital data encoded on the video signal. A phase-locked loop in the transmitter is used to phase-lock a color burst subcarrier in the video signal to a local oscillator in the phase-locked loop to phase-lock a data clock to the subcarrier. A phase-locked loop in the receiver is also used to phase-lock the subearrier of the transmitted video signal to a local oscillator in the phase-locked loop to again phase-lock a data clock to the subcarrier. By phase-locking a data clock to the subcarrier in both the transmitter and receiver, the data clock and the receiver can be synchronized to the data clock and the transmitter to provide for effective digital data recovery without the use of additional data bits for clock phase information.

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First Claim