The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 1997
Filed:
Feb. 16, 1995
Terumi Takashi, Odawara, JP;
Yasuhide Ouchi, Odawara, JP;
Seiichi Mita, Tsukui-gun, JP;
Akihiko Hirano, Odawara, JP;
Naoki Satoh, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A data recording/reproducing apparatus and method therefor having a Viterbi decoder which stores operation result values of an inputted reproduced signal and the reference value when the peak value of the reproduced signal is updated, compares this value with the reproduced signal in amplitude, updates the stored value when the result satisfies the predetermined condition, detects a change in the polarity of the comparison result, controls the clock counter depending on the status of the peak value updating signal, sets 1 in the shift register at the position indicated by the counter according to the detected polarity inversion signal when the peak value is updated, and accordingly makes the updating and detecting operations independent of operations of addition and subtraction of the current reproduced signal and reference value and operations of addition and subtraction of amplitude comparison.