Servo system for scanning the same track circumference of a spir

Details Servo system for scanning the same track circumference of a spir Servo system for scanning the same track circumference of a spir

1986-01-27

1989-05-23

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 48, 369 54, 360 381, 358336, G11B 700

Patent

active

048336645

ABSTRACT:
During the storing of a tracking error signal and an index detection signal in memories in relation to rotating means for a recording medium, an error is detected when the number of index detection signals is other than one and after the storing of the signal in the memory the missing reproduced index detection signal is interpolated in accordance with the index signal stored in the memory. Also, the stored index detection signal and the reproduced index detection signal are compared in phase so as to determine whether the stored tracking error signal is to be applied to a tracking control system. The memory for storing tracking error signal and the memory for storing index detection signal are combined in one unit.

REFERENCES:
patent: 3152223 (1964-10-01), Wessel
patent: 4417285 (1983-11-01), Mes
patent: 4488278 (1984-12-01), Dieterich
patent: 4608676 (1986-08-01), Yoshida et al.
patent: 4623994 (1986-11-01), Nabeshima et al.

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