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:
Jul. 22, 1997
Filed:
Mar. 09, 1995
Applicant:
Inventors:
Alfred W Stufflet, Norristown, PA (US);
Richard W Westerfer, Blue Bell, PA (US);
Assignee:
General Instrument Corporation of Delaware, Chicago, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 15 ; 380-7 ; 380 14 ; 348476 ;
Abstract
A video signal is modified to include a supplemental burst signal on at least some of the scan lines for each frame. The supplemental burst signals are used to prevent a pirate decoder from descrambling horizontally sync suppressed scrambled signals by deriving a synchronization timing reference from the color burst signal. The supplemental burst signals can also or alternatively be used to carry data in an otherwise conventional analog video signal.