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:
Jun. 23, 1992
Filed:
Oct. 29, 1990
Applicant:
Inventor:
Akihiko Naito, Tokyo, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
380 20 ; 380 15 ; 380-7 ; 380 43 ;
Abstract
A television scrambling system of the GSS type includes a false key signal to defeat pirate decoders. The false key is placed approximately one half a horizontal line period following the last horizontal sync pulse preceding the vertical blanking interval of the television signal. If the pirate decoder is set to attenuate the video portion of the picture signal in response to receipt of a standard GSS scrambled signal, the pirate decoders will attenuate only the sync portion of the picture signal in response to a signal scrambled with the false key.