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:
Mar. 17, 1987
Filed:
Oct. 15, 1985
Applicant:
Inventor:
Hiroki Uemura, Tokyo, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04K / ; H04K / ; H04K / ; H04N / ;
U.S. Cl.
CPC ...
380-7 ; 455-1 ; 380 20 ;
Abstract
A jamming circuit for a CATV system in which the jamming signal is offset in frequency by a voltage controlled oscillator and then mixed with the unjammed television signal. A difference component is obtained from the mixer and is attenuated to a fixed level. This signal is then 100%-AM-modulated by a low frequency signal. The AM-modulated signal is mixed with an output from the voltage controlled oscillator and the double side bands are superimposed on the television line feeding the terminal of the subscriber.