Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1990-09-20
1994-05-10
Psitos, Aristotelis
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
319 54, 319 58, 319 59, G11B 509
Patent
active
053114914
ABSTRACT:
A method of recording information is provided, in which a first signal is recorded along the length of a recording track previously formed on a recording medium. On the recording track, a second signal is prerecorded by offsetting the track along its width. During the recording of the first signal, the points of transition of the first signal are positioned so as to be spaced apart from, and therefore unaffected by, the points of transition of the second signal. Also, by including a clock synchronization signal in the first signal, PLL capture may be achieved accurately in a shorter time. In addition, the unit of phase shift between the channel clock of the first signal and the channel clock of the second signal is set to be shorter than the channel clock bit. A data recording method and an optical data recording method are also provided, which may be suitably applied to a magneto-optical disc or the like. The data are previously modulated by a modulation system satisfying a predetermined rule of modulation and include connection bits between adjacent units of the modulated data by way of further modulation. Control information is recorded by offsetting the track along its width, while the points of transition of the track along its width coincide with the recording region for the connecting bits, since the latter are not part of the main signal information.
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Sako Yoichiro
Yamagami Tamotsu
Eslinger Lewis H.
Maioli Jay H.
Psitos Aristotelis
Sony Corporation
Tran Thang V.
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