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:
Nov. 21, 2000
Filed:
Feb. 24, 1998
Satoru Higashino, Tokyo, JP;
Yoshihide Shinpuku, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
It is intended to reduce the rate of occurrence of prediction value judgment errors. Where a prediction value x'.sub.n-1 of a 1-clock preceding code is 0, a judgment circuit 1 outputs a value '1' as a prediction value x'.sub.n if a reproduction signal value y.sub.n sampled at time n is greater than or equal to a threshold value .eta. that is supplied from a threshold value generating circuit 6, and outputs a value '-1' as the prediction value x'.sub.n if y.sub.n <.eta.. Where x'.sub.n-1 is not 0, the judgment circuit 1 outputs a value '0' as the prediction value x'.sub.n. Therefore, the control circuit 1 outputs a value '0' every other clock as a prediction value. During the interval between the first two clocks, the threshold value .eta. is set at 0. Then, when supplied with codes of a given pattern that are arranged at the start, a switch 2 selects the prediction value x'.sub.n that is supplied from the judgment circuit 1. An operation circuit 16 calculates a phase error .DELTA..tau..sub.n from the prediction value x'.sub.n and the sampled value y.sub.n. On the other hand, an operation circuit 17 calculates a level error .DELTA..gamma..sub.n from the prediction value x'.sub.n and the sampled value y.sub.n.