CATV system

Details CATV system CATV system

1995-05-24

1998-06-16

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 9, 380 20, 380 49, 348 6, 348 10, 348 12, 455 31, 455 51, 455 61, 455 62, 455 63, H04N 7167, H04L 900

Patent

active

057683751

ABSTRACT:
An image-data-system host computer outputs image data, the protocol of which is not disclosed. The image data outputted from the image-data-system host computer is transmitted via an image-data-system terminal and a video control unit to a data management unit. On the other hand, the data management unit decrypts in accordance with a protocol and acquires text data outputted from a text-system host computer whose protocol is disclosed. A signal transmitting unit transmits the image data and the text data outputted from the data management unit via a coaxial cable to a display unit. The display unit displays images in response to the image data and the text data received from the signal transmitting unit.

REFERENCES:
patent: 4860379 (1989-08-01), Schoeneberger et al.
patent: 5235680 (1993-08-01), Bijnagte
patent: 5412720 (1995-05-01), Hoarty
patent: 5530754 (1996-06-01), Garfinkle

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