Digital data reproducing apparatus

Details Digital data reproducing apparatus Digital data reproducing apparatus

1996-03-21

1997-09-30

Mai, Tan V.

Boots, shoes, and leggings

364721, G06J 100, G06F 102

Patent

active

056732112

ABSTRACT:
A digital data reproducing apparatus performs an accurate data decoding by appropriately correcting a phase error as well as a level error in sample values of a read signal. When a sampling value with an absolute value smaller than a specified value is extracted from a sample value series of the read signal successively outputted from an A converter according to a timing of a sampling clock pulse, the value is obtained as an extracted value and also a slant signal indicating a positive or negative sign of a slant in a portion corresponding to the extracted sample value in the sample value series is obtained, and a phase in the sampling clock pulse is corrected according to the extracted sample value as well as the slant signal, and also a level of an output sample value from the A/D converter is corrected according to the extracted sample value, and digital data according to the sample value subjected to the level correction is decoded. With this feature, it is possible to automatically correct a phase in the sampling clock pulse as well as a level of the sample value to their optimal state, so that a high-precision sample value can be obtained, which suppresses increase of any error in decoded data.

REFERENCES:
patent: 4755961 (1988-07-01), Kuriki et al.
patent: 5258933 (1993-11-01), Johnson et al.
patent: 5381355 (1995-01-01), Birangi et al.
patent: 5442575 (1995-08-01), Gast et al.

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