Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1988-04-19
1992-06-09
Shaw, Dale M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369120, 369121, G11B 700
Patent
active
051213770
ABSTRACT:
A method and apparatus for reducing the number of errors generated when reading digital data stored on a recording medium such as film, the method comprising passing light of two different frequencies (i.e., two different frequency bands) through the film, one frequency being modulated by digital data stored on the film and the other being unaffected by the stored data. The light that is unaffected by the stored data is modulated by debris on the film such as dirt and is used to flag data bits that may be in error to thereby facilitate an error correction process. In the first disclosed embodiment the two frequencies of light are processed separately to obtain the digital data and error flags. A second embodiment combines all light passing through the film to produce digital information that includes error flags.
REFERENCES:
patent: 3407272 (1968-10-01), Barocela
patent: 3513268 (1970-05-01), John
patent: 4235531 (1980-11-01), McCormick
patent: 4238760 (1980-12-01), Carr
patent: 4600280 (1986-07-01), Clark
Bose Corporation
Huntley David
Shaw Dale M.
LandOfFree
Error detection method and apparatus for reducing the number of does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Error detection method and apparatus for reducing the number of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Error detection method and apparatus for reducing the number of will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1810622