rimary and secondary frame rates a sum of (1) A/P, (2) ((P/S)+r)F1 where F1 represents a number of calls of a primary frame of frame rate P to a secondary frame of frame rate S and r is a variable based on a method of storing framing information, and (3) ((S/T)+r)F2 where F2 represents a number of calls of said secondary frame of frame rate S to a tertiary frame of frame rate T; (d) repeating step