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. 28, 1995
Filed:
Apr. 20, 1993
William J Buynak, Bayville, NY (US);
Eugene Leonard, Sands Point, NY (US);
Graham S Stubbs, Poway, CA (US);
Karoly Budai, Danbury, CT (US);
Eidak Corporation, Hyannis, MA (US);
Abstract
Augmenting pulses are added to the horizontal sync pulse intervals of a video signal to prevent a copy of the thus modified video signal from being satisfactorily displayed. The magnitude of the augmenting pulses is chosen so that the modified signal containing these pulses can be displayed without distortion. When the modified video signal is recorded and then reproduced by a typical VCR (i.e., when the modified video signal is copied), attenuation of the augmenting pulses and the remaining portions of the horizontal sync pulse occurs so that a television receiver cannot properly detect horizontal sync in the copied modified video signal, resulting in an unsatisfactory display.