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, 2003
Filed:
Dec. 17, 1998
Joseph B. Glaab, New Hope, PA (US);
General Instrument Corporation, Horsham, PA (US);
Abstract
Conventional decoding systems for scrambled audio-visual signals are improved by providing a dual-side local oscillator that functions as a high-side oscillator if the incoming RF signal is unscrambled and as a low-side oscillator if the incoming RF signal is scrambled. The result is that the unscrambled signal is reversed from an audio-over-video transmission configuration to an IF signal with a video-over-audio configuration, and a scrambled signal is maintained in a video-over-audio configuration, the video-over-audio configuration being the configuration required for proper reception and use of the signal by a television set. To function as both a high- and low-side oscillator, the dual-side oscillator has independent voltage control and does not follow the tracking filter associated with the tuner.