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:
May. 01, 1990
Filed:
Jul. 29, 1988
James O Farmer, Lilburn, GA (US);
Luis A Rovira, Norcross, GA (US);
Scientific-Atlanta, Inc., Atlanta, GA (US);
Abstract
The quality of sound delivered to a subscriber viewing a channel which has been scrambled using sync suppression scrambling, particularly when the program is being transmitted with stereo sound, is improved by processing the aural component of the TV signal at the head end of the system prior to transmission over the cable or other communication link to the subscribers. The amplitude of the aural signal is reduced so as to compensate for the increase in amplitude which occurs when the composite TV signal is descrambled by restoring the amplitude of the suppressed synchronizing signals thereof. No changes are required in the existing subscriber equipment and the subscribers may continue to use the descramblers supplied to them without any modification thereof. Noises, such as are perceived as a 'buzz' like sound, and loss of stereo separation of the aural signal upon descrambling are avoided.