System for detecting rotational deviation of a rotary recording

Details System for detecting rotational deviation of a rotary recording System for detecting rotational deviation of a rotary recording

1990-08-23

1993-07-13

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360 7303, 358342, G11B 700, G11B 1924

Patent

active

052280209

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 afrer 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.

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patent: 4761772 (1988-08-01), Marakami
patent: 4984227 (1991-01-01), Yoshimaru

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