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:
Jun. 08, 2004
Filed:
Jan. 28, 2003
Haruo Ohta, Hirakata, JP;
Yoshikazu Katoh, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A reproduction signal is processed in an AD converter and an equalizer to be a decoder input signal . The decoder input signal is used to calculate a phase error signal and a quality judgement signal . A phase-frequency error detection circuit retains a sign of the phase error signal obtained when the quality judgement signal is changed in quality from “good” to “bad”. The phase-frequency error detection circuit then outputs, as a phase-frequency error signal , the phase error signal when the signal quality is “good”, and a given value corresponding to the retained sign when the signal quality is “bad”. A voltage controlled oscillator generates a recovered clock signal whose frequency is based on the oscillation control signal generated by the phase-frequency error signal