| 摘要 |
Apparatus and methods are provided for scrambling and unscrambling video signals. In one embodiment an apparatus (300) for scrambling video signals comprises a device for providing time, N devices for mixing a frequency with a video signal, each of the N devices for mixing a frequency, having a frequency distinct from frequencies of the other N-1 devices for mixing a frequency, a device for coupling each one of N video signals to each one of the N devices for mixing a frequency, and a device for controlling the device for coupling to pseudorandomly couple each one of the N video signals to a distinct one of the N devices for mixing a frequency, the controlling of the pseudorandom coupling being a function of time read from the device (303) for providing time. The output is a set of N scrambled video channels. To unscramble the scrambled video channels, apparatus is provided that reverses the scrambling.
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