Charge-coupled-device based all-analog wave form scrambling with applications in audio, video, video-on-demand, and TV systems
US5598472A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1696
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A scrambled analog signalling system having a source of analog signals to be sent to a receiving device is comprised of a multiple stage charge coupled device (66) having analog signal input terminals connected to receive analog signal samples from said source of analog signals. The multiple stage charge coupled device having N stages, corresponding stage taps, and an input clock signal. A shuffling circuit (68) having a first input connected to the N stage taps for receiving the analog signal samples and second input for receiving a random seed (67) signal to cause a random reordering of incoming analog signal samples, a source of random seed signals connected to the second input, and an output device (72) connected to receive a stream of the analog signal samples which have been shuffled according to a mapping code carried by the random seed signal. A filter for reconstructing the analog signal in its scrambled format, and a transmission system for conveying the analog signal in its scrambled format to the receiving device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.