TRACKING ERROR DETECTING METHOD

TRACKING ERROR DETECTING METHOD

PROBLEM TO BE SOLVED: To make it possible to generate a tracking error signal according to measured time without recording servo information by measuring the time from the reference position of the track recorded on a band shaped recording medium by a helical scanning system is detected till a presc...

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1. Verfasser: KOYANAI HIROSHI
Format: Patent
Sprache:eng
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INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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description PROBLEM TO BE SOLVED: To make it possible to generate a tracking error signal according to measured time without recording servo information by measuring the time from the reference position of the track recorded on a band shaped recording medium by a helical scanning system is detected till a prescribed signal is detected. SOLUTION: Respective times t1-t3 from a reference position ref (PG signal) to respective synchronizing signals #1-#3 SYNC of respective fragments 702-1 to 3 of a data area 701 are measured. Next, the average value th of absolute values Δt1-Δt3 of respective time difference among respective times t1-t3 and theoretical values t01-t03 is calculated. Then, t1+th or t1-th is made to be a tracking error signal by considering that a magnetic head is deviated to an arrow F2 or an arrow F1 according to t1>t01 or t1
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SOLUTION: Respective times t1-t3 from a reference position ref (PG signal) to respective synchronizing signals #1-#3 SYNC of respective fragments 702-1 to 3 of a data area 701 are measured. Next, the average value th of absolute values Δt1-Δt3 of respective time difference among respective times t1-t3 and theoretical values t01-t03 is calculated. Then, t1+th or t1-th is made to be a tracking error signal by considering that a magnetic head is deviated to an arrow F2 or an arrow F1 according to t1&gt;t01 or t1&lt;t01. 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subjects INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
title TRACKING ERROR DETECTING METHOD
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