Optical recording medium driving apparatus capable of accurately

Details Optical recording medium driving apparatus capable of accurately Optical recording medium driving apparatus capable of accurately

1992-07-08

1995-10-17

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4432, 369 4428, 369124, G11B 708

Patent

active

054597056

ABSTRACT:
In an optical recording medium driving apparatus, only a frequency component corresponding to pits of an ID portion is detected from a total signal representing a total amount of reflected light from an optical disc by a high pass filter. With this frequency component clamped so that a potential at a maximum point becomes a definite potential, a changed amount of light of the total signal corresponding to pits is detected and a phase pit signal is generated. In response to this phase pit signal, a signal component corresponding to pits is removed from the total signal, thereby generating a pit removal signal.

REFERENCES:
patent: 4930114 (1990-05-01), Tateishi
patent: 4959823 (1990-09-01), Getreuer et al.
patent: 4961182 (1990-10-01), Saito et al.
patent: 5128917 (1992-07-01), Kiyoshi
patent: 5194998 (1993-03-01), Kawasaki

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