METHOD OF READING AND/OR WRITING INFORMATION AND APPARATUS FOR CARRYING OUT THE METHOD

摘要

1.8.1979 PHN 9305 Method and apparatus for positioning magnetic heads in a two-head helical scan video recorder, suitable control signals being generated for making the heads follow the tracks by means of piezoelectric transducers. The control signals applied to the two transducers are compared and when these control signals deviate from each other more than to a predetermined extent the one transducer receives the same control signal as the other transducer, so as to ensure that the two heads follow consecutive tracks.