The NTE849 is an integrated circuit in a 14Lead DIP type package designed for use in TV horizontal/ vetical countdown digital sync systems. In some video playback units, there are incorrect frequency relationships between horizontal and field frequencies. Automatic forced asynchronous mode eliminates jitter when equalizer pulses are correct, but these incorrect frequency relationships exist. Automatic standard mode occurs upon detection of nine or more equalizing pulses during a sixline width vertical driving period after seven fields of coincidence between integrated vertical (IV) sync and internal counter output. Standard mode is retained for seven fields of missing or mutilated vertical sync pulses.