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:
Sep. 05, 1995
Filed:
Aug. 31, 1992
Takuya Mizokami, Odawara, JP;
Noritaka Narita, Fujisawa, JP;
Akira Takagishi, Fujisawa, JP;
Masahiro Takasago, Odawara, JP;
Toru Kawashima, Chigasaki, JP;
Masanori Matsuzaki, Chigasaki, JP;
Toshiharu Kon, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A PLL circuit produces a synchronous signal by utilizing a regenerative clock signal in a VFO portion in a regenerative signal which was read out from a recording medium in sections. When a defective portion is present in a regenerative clock signal, the same sector is read out again from the recording medium to obtain the regenerative signal. A loop gain of the PLL circuit is made to be low in the defective portion of the regenerative signal which was read out again, thereby to prevent the synchronous fault of the PLL circuit due to the defective portion.