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:
Feb. 04, 1986
Filed:
Oct. 28, 1982
Applicant:
Inventors:
Pieter den Toonder, Dordrecht, NL;
Dennis E Burke, Elk Grove Village, IL (US);
Ronald L Forbes, McHenry, IL (US);
James F Stoffer, Cary, IL (US);
Assignee:
Oak Industries Inc., Rancho Bernardo, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04K / ;
U.S. Cl.
CPC ...
358114 ; 358118 ; 358120 ; 358123 ; 358124 ;
Abstract
A means for scrambling video signals by the application of a periodic scrambling waveform which has the effect of altering the normal amplitude relationship between horizontal sync and the video picture portion of a horizontal line uses the comparison between the brightness level of the video signal during a predetermined time period with a reference as a means for varying the amplitude of the periodic scrambling waveform.