Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-01-30
1998-06-16
Neyzari, Ali
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 47, G11B 700
Patent
active
057682461
ABSTRACT:
A digital data recording/reproducing apparatus and method using frequency domain detection. The reproducer of the apparatus includes an analog-to-digital converter for converting the read-out signal from the storage means into digital data; a second serial-to-parallel converter for converting the digital data into a block of digital data; a frequency domain converter for converting the block of digital data into a block of frequency domain signals; and a detector for detecting bits of serial binary data from the block of frequency domain signals. The detector comprises a calculating means for calculating Euclidian norms between the block of frequency domain signals and plurality of reference data blocks, respectively, and determining a binary data set which corresponds to the minimum value of the Euclidian norms. Alternatively, the detector comprises a comparing means for sequentially comparing the block of frequency domain signals with a plurality of thresholds to determine the bits of serial binary data. Thus, non-linearity is avoided, and thus high density recording and lower clock frequencies are achieved.
REFERENCES:
patent: 4989219 (1991-01-01), Gerdes et al.
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5291469 (1994-03-01), Yoshinaka
patent: 5406428 (1995-04-01), Suzuki
patent: 5654952 (1997-08-01), Suzuki et al.
Neyzari Ali
Samsung Electronics Co,. Ltd.
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