Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-12-24
1998-08-18
Hindi, Nabil
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 59, G11B 509
Patent
active
057966915
ABSTRACT:
A spindle servo system roughly adjusts a rotational speed of a spindle motor for rotationally driving an optical disk at a specified speed in an optical disk player for reproducing digital data composed of run length limited codes and synchronizing signals, wherein the run length limited codes are restricted between a minimum run length and a maximum run length, and wherein the synchronizing signals are composed of a maximum bit pattern with a run length longer than the maximum run length and an additional bit pattern disposed just before or after the maximum bit pattern with a run length longer than the minimum run length and shorter than the maximum run length, the spindle servo system. The spindle servo system includes a pickup detector for reading the digital data from the optical disk; pattern detecting means for detecting a synchronizing signal composed of the maximum bit pattern and the additional bit pattern from the digital data read by the pickup detector; period detecting means for detecting a period of the synchronizing signal, the period including the maximum bit pattern and the additional bit pattern detected by the pattern detector; and motor for controlling the rotational speed of the spindle motor to maintain the period detected by the period detector at a predetermined value.
REFERENCES:
patent: 4539667 (1985-09-01), Fujiie
patent: 5383171 (1995-01-01), Mizokami et al.
patent: 5615188 (1997-03-01), Ishida et al.
Furukawa Jun-ichi
Tateishi Kiyoshi
Hindi Nabil
Pioneer Electronic Corporation
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