Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-02-13
1998-12-01
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 54, G11B 7085
Patent
active
058448713
ABSTRACT:
To accurately count the tracks traversed on an optical disk, even in the presence of noise and eccentricity, a track-counting apparatus is provided, this apparatus having an edge-detection circuit that detects the edges of a track-crossing signal and generates an edge-crossing signal, a logical AND circuit that takes the logical AND of the edge-crossing signal and a mirror signal to generate an effective edge signal, a direction-discriminating circuit which switches the logic state of the track-crossing signal based on the direction of movement toward the target track, thereby generating a pulse-discriminating signal, a count pulse separating circuit which, based on this pulse-discriminating signal, separates the effective edge signal into a count-down signal and a count-up signal, and a track counter which counts the number of tracks traversed, based on both the count-down signal and the count-up signal which are generated by the count pulse separating circuit.
REFERENCES:
patent: 5184338 (1993-02-01), Shimoda et al.
patent: 5193081 (1993-03-01), Osawa et al.
patent: 5426625 (1995-06-01), Bui et al.
NEC Corporation
Young W. R.
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