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. 23, 1999
Filed:
Sep. 03, 1996
Applicant:
Inventors:
Assignee:
NANAO Corporation, , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H04N / ;
U.S. Cl.
CPC ...
327 99 ; 348705 ;
Abstract
An input signal from a Dsub connector and BNC connectors is selected by an analog switch. The frequency of horizontal and vertical synchronizing signals applied from one connector end is measured by a synchronizing frequency detection circuit. The frequencies of horizontal and vertical synchronizing signals applied from the other connector end are converted into voltage values by F/V converters. A microcomputer determines the presence of a synchronizing signal and selects an input signal from the connector end of a high priority level set in a non-volatile memory.