Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2003-07-21
2008-10-07
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S124120
Reexamination Certificate
active
07433292
ABSTRACT:
Optical disk systems comprising photo detectors (1) for detecting optical disks comprising amplifiers and slicers (2-5) and delay-difference detectors (6) for detecting delay differences in sliced amplified detection signals are improved by installing delaylineless delay-difference detectors (6) comprising combinatorial-logic circuits (7,8) like inverters, ORs, NORs, ANDs, NANDs and sequential-logic circuits (11-18) like SetResetFlipFlops. Without the prior art delay lines, said delay-difference detectors (6) are of a lower complexity and low costly and can be well integrated. By introducing a first pair of sequential-logic circuits (11,12,15,16) for detecting delay differences between rising edges and a second pair of sequential-logic circuits (13,14,17,18) for detecting delay differences between falling edges, both kinds of edges are being used and the influence of time-jitter is less compared to the situation where just one kind of edge is used. Said delay-difference detector (6) further comprises an analog adder/subtracter (9) for adding/subtracting-logic circuit output signals and low pass filter(s) (10) located before or after said adder/subtracter (9).
REFERENCES:
patent: 5258968 (1993-11-01), Matsuda et al.
patent: 5808979 (1998-09-01), Ishibashi et al.
patent: 5901120 (1999-05-01), Matsui
patent: 6775210 (2004-08-01), Tateishi
patent: 6940799 (2005-09-01), Ma et al.
patent: 1096481 (2001-05-01), None
A BiCMOS 1X to 5X Combined Analog Frontend IC for DVD-ROM & Movie Players from IEEE 1998 Custom Integrated Circuits Conference, pp. 14.6.1 to 14.6.4 or pp. 333 to 336.
Brekelmans Johannes Hubertus Antonius
De Jong Gerben Willem
Voorman Johannes Otto
Belk Michael E.
Feild Joseph
Koninklijke Philips Electronics , N.V.
Lamb Christopher R
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