Data writing density judging apparatus and method

Details Data writing density judging apparatus and method Data writing density judging apparatus and method

1995-10-31

1998-06-30

Huber, Paul W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4425, 369 4428, 369 58, G11B 390

Patent

active

057744386

ABSTRACT:
An improved data writing density judging apparatus and method for a disc capable of judging a writing density of a disc by detecting an amount of cross talk or detecting a tracking error signal. Cross talk is detected when a disc track is scanned by a beam. A tracking error signal is detected when a pick-up member jumps a certain track while the pick-up member moves across a disc track. The improved apparatus and method computes a ratio between a minimum value and a maximum value of an envelope signal based on the detected amount of cross talk a writing density can be determined. The improved apparatus and method also converts a tracking error signal which is a high frequency analog signal into a digital signal that is used to compute a time required for a pick-up member to jump a certain track. Based on the computed time which is compared with a reference value, a writing density of a disk can also be determined.

REFERENCES:
patent: 4577301 (1986-03-01), Mathews et al.
patent: 4759007 (1988-07-01), Eberly
patent: 5276664 (1994-01-01), Shikunami

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