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:
Dec. 20, 1977
Filed:
Feb. 03, 1976
Applicant:
Inventors:
Yoshifumi Saeki, Tokyo, JA;
Hiroki Uemura, Tokyo, JA;
Assignee:
Pioneer Electronic Corporation, Inglewood, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358118 ; 358120 ; 358121 ;
Abstract
Video signals for television are effectively scrambled and may later be descrambled without the presence of annoying visual disturbances by the introduction of a superposed distorted sine wave in synchronism with the horizontal synchronizing signal, in a 'gray sync' mode of operation. Thereafter, the received signal may be normalized and descrambled by compensatory and synchronous modulation. Advantageously, the sinusoidal variation may be imposed both upon aural and visual components of the signal, and the aural AM signal may be utilized as a reference in descrambling the visual component.