Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1998-03-13
2000-06-27
Kim, W. Chris
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
360 51, G11B 2736, G11B 509
Patent
active
060814926
ABSTRACT:
A disc reproduction device, in which at the time of normal reproduction, a rotational speed of a spindle is detected based on a reproduction signal from the disc by a rotational speed counting circuit, a control signal that makes a speed error with respect to a reference speed zero is given to a first VCO as the control voltage thereof, a reproduction clock is generated while controlling the frequency and phase at a digital PLL circuit by using the oscillation output thereof as the reference frequency of the first PLL circuit containing a second VCO and in which, at the time of access, the control signal to the first VCO is switched to the output signal of the phase comparator by the switch circuit under the control of the controller and a multiple PLL circuit containing the first VCO, phase comparator, LPF, and so forth, is constituted to make the oscillation frequency of the first VCO track the reproduction speed at the destination of access predicted based on the access information by the controller. As a result, the access time can be reduced.
REFERENCES:
patent: 5353271 (1994-10-01), Abe
Asai Nobuyuki
Nakamura Shinobu
Kananen Ronald P.
Kim W. Chris
Sony Corporation
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