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. 29, 1999
Filed:
Jan. 30, 1997
Yoichi Yamaki, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A bit synchronization circuit receives polarity-judged output signal and a level-judged output signal that are produced through demodulation of a 2-value FSK or 4-value FSK transmission signal. Flip-flop circuits and an exclusive-OR circuit generate a second sampling output by sampling and delaying the polarity-judged output signal. Flip-flop circuits and an exclusive-NOR circuit generate a third sampling signal having a given temporal relationship with the second sampling output by sampling and delaying the level-judged output signal. AND circuits supply a correction signal to a counter circuit when levels of the second and third sampling outputs and a phase signal indicating a correction period of the counter circuit satisfy a given relationship. In response to the correction signal, the counter circuit corrects its count so as to produce a clock signal having a rate that is equal to a transmission rate of the transmission signal.