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:
Oct. 08, 1991
Filed:
Oct. 11, 1989
Applicant:
Inventor:
Koichi Tomatsuri, Katsuta, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358444 ; 358443 ;
Abstract
A video memory control apparatus has a frame memory in a video printer or the like constituted by two field memories. The two field memories are arranged so as to be switched in response to a signal obtained by frequency-dividing a vertical synchronizing signal into halves. At this time, not only the respective outputs of the two field memories are switched but also the supply of clock pulses for writing/reading is switched in response to the frequency-divided signal.