Apparatus for encoding of information
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United States of America Patent
Stats
-
Aug 2, 1983
Issued Date -
N/A
app pub date -
Mar 26, 1980
filing date -
Feb 20, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composite video signal containing an information portion and a synchronization pulse is encoded by shifting the level of the synchronization pulse and also by inverting the information portion. The encoding is switched on and off at a randomly chosen frequency, under the control of random number generator enabled at regular intervals. The encoded signal is transmitted with a data signal representing the random number so that a receiver can decode the received signal. The transmitted data can include details of undesired recipients, to disable their decoders. Applied to a pay TV system, the transmitted data can include the rate to be charged for the program and a billing mechanism at the receiver will meter the appropriate charge.
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