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:
Mar. 20, 1990
Filed:
Jul. 20, 1988
Hitoshi Takeuchi, Nara, JP;
Taizo Sasada, Hirakata, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A digital modulation signal is sampled by an A/D converter in a predetermined cycle. A phase interval P between a zero level crossing and the current sampling point using sampling data S.sub.i+1 at the current sampling point and sampling data S.sub.i at a sampling point which is located one point before the current sampling point. A phase P.sub.i+1 of the current sampling point is found using the phase interval P, a phase P.sub.i of the sampling point which is located one point before the current sampling point, a phase P.sub.i -1 of a sampling point which is located two points before the current sampling point and a phase P.sub.i-2 of a sampling point which is located three points before the current sampling point. A clock signal is detected using the phases P.sub.i+1 and P.sub.i. Digital data is detected using the phase interval P, the phase P.sub.i+1 and the sampling data S.sub.i at the sampling point which is located one point before the current sampling point.