Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-03-01
1996-07-16
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 13, 369 4425, 369106, 369124, G11B 700
Patent
active
055373836
ABSTRACT:
An apparatus and method for providing differential detection and source noise subtraction in data signals read from magneto-optic (MO), write-once (WO) or other types of optical storage media using an incident radiation beam. A source monitor signal is generated by detecting radiation from an optical source providing the radiation beam. An error detector generates an error signal corresponding to a difference between the source monitor signal and a reference signal. A power level of the radiation beam is adjusted in response to the error signal. A data signal generator is adapted to receive a return beam resulting from application of the radiation beam to the medium and to generate a WO data signal from the return beam. A signal combiner combines the data signal and the source monitor signal to provide a compensated WO data signal. An MO data signal may be generated using a separate AGC circuit to adjust the gain of each differential detection channel in accordance with low-frequency amplitude differences between the detected signals and a reference signal. The same reference signal may be used in both the source noise subtraction and the MO data signal generation.
REFERENCES:
patent: 4617654 (1986-10-01), Gross et al.
patent: 4691308 (1987-09-01), Takagi et al.
patent: 4718121 (1988-01-01), Epworth
patent: 4730294 (1988-03-01), Funada
patent: 4774615 (1988-09-01), Revelli et al.
patent: 4833662 (1989-05-01), Yoda
patent: 4841510 (1989-06-01), Yoshizawa
patent: 4881216 (1989-11-01), Deguchi et al.
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 4964110 (1990-10-01), Horimai et al.
patent: 4992754 (1991-02-01), Blauvelt et al.
patent: 5067117 (1991-11-01), Shimizu et al.
patent: 5084850 (1992-01-01), Yanagawa et al.
patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5132639 (1992-07-01), Blauvelt et al.
patent: 5132953 (1992-07-01), Matsubayashi
patent: 5146449 (1992-09-01), Shimozawa
patent: 5166509 (1992-11-01), Curran
patent: 5166989 (1992-11-01), Kurdi et al.
patent: 5189650 (1993-02-01), Watanabe et al.
patent: 5200942 (1993-04-01), Hosobata et al.
patent: 5218591 (1993-06-01), Shimamoto et al.
patent: 5247501 (1993-09-01), Hashimoto et al.
patent: 5265085 (1993-11-01), Jaquette et al.
patent: 5282188 (1994-01-01), Gage
patent: 5287340 (1994-02-01), Chapman et al.
patent: 5295129 (1994-03-01), Lee
patent: 5297128 (1994-03-01), Yamaguchi et al.
patent: 5309423 (1994-05-01), Noguchi et al.
patent: 5339302 (1994-08-01), Takahashi et al.
patent: 5363363 (1994-11-01), Gage
patent: 5398227 (1995-03-01), Miyaoka et al.
Dohmeier Steven C.
Gage Edward C.
Ben Loha
Eastman Kodak Company
Owens Raymond L.
LandOfFree
Optical data storage system with differential data detection and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical data storage system with differential data detection and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical data storage system with differential data detection and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1790090