Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...
Reexamination Certificate
2006-04-11
2006-04-11
Nguyen, Hoa T. (Department: 2653)
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal processing for controlling recording light...
C369S059200, C369S059220
Reexamination Certificate
active
07027375
ABSTRACT:
A multi-value data recording and reproducing device is provided that can accurately eliminate interference among codes through waveform equalization when reproducing information from a reproduction signal having levels multi-valued through modulation of the areas of recording marks on an optical information recording medium. This multi-value data recording and reproducing device is embodied by a multi-value data detecting circuit that varies the sizes of the recording marks in accordance with multi-value data (0, 1, 2, . . . , (m−1): m being an integer of 3 or greater) on the optical information recording medium, and detects the multi-value data through predetermined signal processing on signals obtained by scanning the recording marks with an optical spot. This multi-value data detecting circuit includes: a predictor that predictively determines the multi-value data; a delay unit that delays the predetermined signal processing by the period of time required for the predictive determination by the predictor; and a determiner that determines the multi-value data through waveform equalization based on predictive data that are the predictive determination results from the predictor.
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Nguyen Hoa T.
Pham Van
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