Secure coding and decoding system and method for television program signals
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United States of America Patent
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Jul 15, 1986
Issued Date -
N/A
app pub date -
Nov 27, 1984
filing date -
Jul 29, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Parts of a composite video signal, such as segments of each horizontal scan line, are stored in analog storage devices and retrieved therefrom in a cyclic manner to rearrange them and thereby encode the signal. The cyclic retrieval of the information from the storage devices is carried out on a selective basis in accordance with the binary state of a pseudo-random signal that is generated independently at each of the encoding and decoding stations. Synchronization of the two independently generated signals is provided by a control word and an initialization word that are transmitted with the encoded video signal, one of which is encrypted. Decryption of the word is carried out with a master key at each of the encoding and decoding stations.
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