Track counting device using a PLL

Details Track counting device using a PLL Track counting device using a PLL

1992-01-22

1994-05-03

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

360 7814, 369 54, G11B 700

Patent

active

053094182

ABSTRACT:
A track counting device receives a tracking error signal from a light pickup element which is moving over a record medium having recording tracks thereon. A wave shaping circuit shapes the tracking error signal into a signal of rectangular pulses. A phase-locked loop (PLL) circuit receives the signal and compares it with a signal created by itself so as to synchronize a phase between two signals. The PLL circuit constantly effects the comparison to obtain the synchronized signal, so that it may provide information about the number of tracks crossed by the light pickup element apart from influence of surface conditions on the record medium such as a mirror finished surface and pits. A counter counts the number of tracks based on the synchronized signal.

REFERENCES:
patent: 4527145 (1985-07-01), Haussmann et al.
patent: 5034940 (1991-07-01), Saito et al.
patent: 5050146 (1991-09-01), Richgels
patent: 5128916 (1992-07-01), Ito et al.
Lathi "Modern Digital and Analog Communication Systems" 1989, pp. 81-82, 322-325; 346-350.
Kazuhisa Koumura, et al., "High Speed Accessing by Direct Accessing" Proceedings of the International Symposium on Optical Memory, Japanese Journal of Applied Physics, vol. 28 (1989) Supplement. 28-3, pp. 73-76.

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