Rapid stepping of a moving recorded medium

A video replay system for use with a recorded medium, said system comprising input means for receiving an external reference clock signal, a medium driving means for initially moving said recorded medium at its normal replay velocity with a recorded correlating frequency thereon phase locked to said external reference clock signal of the same frequency, and

• control means coupled to said driving means and to said input means for receiving an external reference clock signal for changing the velocity of the recorded medium from the normal replay velocity during a first interval and immediately thereafter changing the velocity of the recorded medium back to the normal replay velocity during a second interval of equal duration with said first interval to thereby temporarily step the velocity of the recorded medium relative to the normal playback velocity by a preselected time segment relative to the external reference clock signal and within specified reference clock and position sequence increments.