Scrambling system of television signal
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 21, 1986
Grant Date -
N/A
app pub date -
Feb 17, 1984
filing date -
Feb 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scrambling system of television signal includes a circuit for eliminating vertical sync pulses in a vertical sync pulse period and equivalent pulses in first and second equivalent pulse periods at opposite ends of said vertical sync pulse period. In place of the eliminated pulses, substitute pulses having a frequency equal to an integer times the frequency of horizontal sync pulses are deposited. A framing code inserting circuit is provided for inserting at least one framing code in the substituted pulses. The framing code is carrying information how the television signal is scrambled.
First Claim
Family
International Classification(s)
Cited Art Landscape
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