Apparatus for detecting an unrecorded optical disc

Details Apparatus for detecting an unrecorded optical disc Apparatus for detecting an unrecorded optical disc

1991-04-23

1992-12-29

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

G11B 700

Patent

active

051757192

ABSTRACT:
An optical recording apparatus for recording desired information signals by an optical head on an optical disc, on which information signals may be optically recorded, is disclosed. The apparatus includes a peak-holding circuit for holding a peak value of reproduced RF signals from the optical head, a bottom-holding circuit for holding a minimum value of the reproduced RF signals, and a decision circuit for deciding if the optical recording disc is an unrecorded disc by comparing the peak value from the peak-holding circuit with the minimum value from the bottom-holding circuit.

REFERENCES:
patent: 4630252 (1986-12-01), Miura et al.
patent: 5053898 (1991-10-01), Hashimoto et al.

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