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. 19, 1992
Filed:
Apr. 26, 1990
Applicant:
Inventors:
John D Ross, Iroquois, CA;
David A Ross, Iroquois, CA;
Assignee:
Ross Video Limited, Iroquois, Ontario, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358183 ; 358182 ; 358181 ;
Abstract
Multi-keying circuitry for inserting a plurality of keys into a background television signal where at least the keying signal processing circuitry is time shared by control circuitry to effect the key insertions. The control circuitry includes dual port rams and RAM-DAC's to facilitate the time share operation. Circuitry for effecting transitions between the keys either individually or in groups is disclosed as is circuitry for previewing the keys or the transitions thereto either individually or in groups.