| 4563702 |
Video signal scrambling and descrambling systems |
| Jan-7-1986 |
Systems for scrambling and descrambling video information lines. The scrambling system includes a memory; a storage system for sequentially storing groups of four video information lines in the memory;... |
| 4547802 |
TV Scrambler/descrambler using serial memories |
| Oct-15-1985 |
Apparatus for scrambling and descrambling the video portion of TV signals is disclosed. The video portion of the TV signal is stored in a serial memory such as a charge coupled device. Scrambling is accomplished... |
| 4464678 |
Time window key system for video scrambling |
| Aug-7-1984 |
A video scrambling device requires that a key signal be periodically inserted into a subscribers box, e.g. once a month. The key signal is a function of both the box number and the time, and thus once... |
| 4266243 |
Scrambling system for television sound signals |
| May-5-1981 |
An audio scrambler operates on segments of audio divided from a continuous audio signal to rotate head-to-tail the string of information contained in the segment by an amount which is at pseudo-random... |
| 4070693 |
Secure television transmission system |
| Jan-24-1978 |
A system for transmitting a secure television image is as disclosed. At the transmitter each line of the television image is digitized to generate a series of digital numbers representing the complete... |
