Discriminator for detecting signal presence on optical media

Details Discriminator for detecting signal presence on optical media Discriminator for detecting signal presence on optical media

1992-11-06

1994-05-03

Callahan, Timothy P.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

377 39, 377 44, 377 45, G11B 2736

Patent

active

053094204

ABSTRACT:
To sense the presence of written data on an optical disk, the readback signal from the disk is detected, and the intervals between detected signal events are measured. That signal event occurring at an expected time delta after the preceding signal event indicates a valid data signal time delta. Those signal events occurring at an unexpected time delta after the preceding signal event indicates the readback signal to be noise. If the count of valid signal time deltas minus the unexpected time deltas attributed to noise accumulates rapidly along a given track within a given sector of the optical disk that sector is determined to be written. Provision is made for counting signal events in accordance with the specific run-length limited in use.

REFERENCES:
patent: 3863228 (1975-01-01), Taylor
patent: 4695991 (1987-09-01), Hudson
patent: 4791622 (1988-12-01), Clay et al.
patent: 4914661 (1990-04-01), Mester

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