Servo tracking for helical scan recorder

Details Servo tracking for helical scan recorder Servo tracking for helical scan recorder

G - Physics

11

B

G11B 5/584 (2006.01) G11B 5/02 (2006.01) G11B 5/588 (2006.01)

Patent

CA 2066189

In a servo tracking method and apparatus, a servo head (S) of a helical scan recorder (30) endeavors to travel equidistant between two servo signal-bearing stripes recorded on the tape (32). The recorder (30) determines a reference-crossing time at which the servo head (S) begins to cross a horizontal reference line (606) drawn with respect to the beginning of a stripe on the tape (32). The servo head (S) samples the amplitude of a servo signal provided on the tape (32) at a plurality of predetermined times after the reference-crossing time. A servo tracking circuit (175) uses the amplitudes of the servo signal at the predetermined sampling times to determine how to adjust the position of said head (S) relative to the pitch of said stripe.

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