Sync suppression scrambling and descrambling of television signals for subscription TV
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 1, 1990
Grant Date -
N/A
app pub date -
Jul 29, 1988
filing date -
Jul 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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