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. 02, 2004
Filed:
Nov. 16, 2000
Applicant:
Inventor:
Hiroki Miyamoto, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N 5/50 ;
U.S. Cl.
CPC ...
H04N 5/50 ;
Abstract
When adjusting a free-running frequency of a voltage controlled oscillator, the video intermediate frequency processing apparatus receives a VIF-DEFEAT signal to a VIF-AMP to minimize gain of the VIF-AMP, and thereby, the VCO is placed into a free-running state. The VIF-DEFEAT signal is also used to turn off a switch, thereby preventing the detection result such as a weak electric field of a video detection signal by an IF-AGC circuit from being input into an AFT-DEFEAT circuit. Therefore, in an automatic frequency tuning circuit, it is possible to take a free-running frequency of the VCO converted into a direct current from a pad.