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:
May. 15, 2001
Filed:
May. 13, 1997
Applicant:
Inventor:
Hiroyuki Hatano, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04N 5/50 ;
U.S. Cl.
CPC ...
H04N 5/50 ;
Abstract
An AFT circuit achieves automatic fine tuning by use of an AFT voltage obtained by a F/V converter through its F/V conversion of an output from a VCO that is controlled by a PLL circuit to operate in synchronism with a video carrier included in a television signal supplied from outside. The center frequency of the VCO is shifted by adding the AFT voltage to an output signal from the phase comparator of the PLL circuit in order to obtain a wider capture range for automatic fine tuning.