Delay signal generator and recording pulse generator

Details Delay signal generator and recording pulse generator Delay signal generator and recording pulse generator

2003-11-07

2008-12-30

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S161000, C327S163000

Reexamination Certificate

active

07471128

ABSTRACT:
A write strategy circuit (recording pulse generator) generates a recording pulse for controlling a laser output applied to an optical disc using data modulated by a DVD encoder or a CD encoder. A delay circuit delays delay subject signals by a predetermined amount to generate delay signals. A delay amount for the delay circuit is controlled by a delay amount control circuit. A logic circuit generates a recording pulse by logically synthesizing the delay signals. The delay amount control circuit includes a voltage controlled oscillator formed by connecting, in a ring-like manner, a plurality of delay elements having the same configuration as the delay elements included in the delay circuit. An output signal of the voltage controlled oscillator is locked at a point where a delay amount for each delay element becomes a fraction of an integer of one cycle of a reference clock signal.

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patent: 2001/0055357 (2001-12-01), Chen
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Japanese Laid-Open Publication 2002-197657 corresponds to document AA.
Japanese Laid-Open Publication 2002-109657 corresponds to document AA.

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