TV Scrambler/descrambler using serial memories

Details TV Scrambler/descrambler using serial memories TV Scrambler/descrambler using serial memories

1983-04-29

1985-10-15

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178 2219, 178 2204, 358123, H04N 716, H04K 106

Patent

active

045478023

ABSTRACT:
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 by shifting the end portion of the lines of video to the beginning by recirculating the data stored in the charge coupled devices for a portion of a line of the video signal. Two charge coupled devices are provided so that when the data stored in one device is being recirculated for scrambling the subsequent line can be stored in a second device. Descrambling is an inverse operation and is accomplished in essentially identical hardware.

REFERENCES:
patent: 4070693 (1978-01-01), Shutterly
patent: 4087626 (1978-05-01), Brader
patent: 4232193 (1980-11-01), Gerard
patent: 4405942 (1983-09-01), Block et al.

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