Magnetic recording and reproducing system for periodical signals

Claim 1

A MAGNETIC RECORDING SYSTEM FOR RECORDING PERIODICALLY RECURRING GROUPS OF SIGNALS ON A MAGNETIC STORAGE SURFACE, SAID RECORDING SYSTEM COMPRISING A MAGNETIC STORAGE SURFACE, TWO MAGNETIC RECORDING HEADS MOUNTED IN FIXED RELATION WITH RESPECT TO EACH OTHER ADJACENT TO SAID MAGNETIC STORAGE SURFACE, SCANNING MEANS OPERABLE TO PRODUCE RELATIVE MOTION BETWEEN SAID HEADS AND SAID SURFACE, SAID SCANNING MEANS BEING ADAPTED TO DEFINE SUBSTANTIALLY PARALLEL TRACKS ACROSS SAID STORAGE SURFACE EACH COMPRISING A PLURALITY OF SEPARATE SEGMENTS OF GIVEN LENGTH, THE MAGNETIC GAP OF ONE OF SAID HEADS BEING SPACED FROM THE MAGNETIC GAP OF THE OTHER OF SAID HEADS BY A DISTANCE EQUAL TO ONE-HALF SAID GIVEN LENGTH, INPUT MEANS ADAPTED TO RECEIVE PERIODICALLY RECURRING GROUPS OF SIGNALS AND TO APPLY SAID SIGNALS TO SAID HEADS, AND SWITCHING MEANS OPERABLE TO SWITCH SAID SIGNALS FROM ONE HEAD TO THE OTHER IN SYNCHRONISM WITH THE PERIOD THEREOF.