Patent ID: 8068308

Claim:
A servo signal recording apparatus capable of recording a servo signal on a servo track of a magnetic tape, comprising: a servo signal reproduction unit that reproduces a servo signal recorded on the magnetic tape; a frequency conversion unit that generates frequency component information by applying a Fourier transform to a PES (position error signal) represented by Expression (3) shown below obtained from the servo signal reproduced by the servo signal reproduction unit; a filter value generation unit that generates a filter value based on the frequency component information generated by the frequency conversion unit; and a recording control unit that writes the filter value generated by the filter value generation unit to a recording medium; wherein the filter value generation unit generates a filter value that enables removal of a periodic noise component included in the frequency component information; PES =( AB −( A 1 B 1/ A 1 C 1)×100)/2 tan Y (3) in expression (3), “Y” is the tilt angle of the strips formed on a servo track of the magnetic tape, “AB” is the distance between a first strip A 1 and a second strip B 1 at the center across the width of the tape, “A 1 B 1 ” is the distance between the first strip A 1 and the second strip B 1 , and “A 1 C 1 ” is the distance between the first strip A 1 and a third strip C 1 , wherein the first strip A 1 slants in a direction opposite to a slanting direction of the second strip B 1 , and the third strip C 1 slants in the same direction as the first strip A 1 , and wherein “A 1 B 1 ” is a value between a maximum value and a minimum value of the distance between the first strip A 1 and the second strip B 1 that are read with the servo signal reproduction unit.