Conversion of television signal formats with retention of common

Details Conversion of television signal formats with retention of common Conversion of television signal formats with retention of common

1991-05-02

1992-08-11

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

358141, H04N 7167

Patent

active

051386593

ABSTRACT:
Television signals are converted from a first format to a plurality of different formats while retaining a common control data stream. A first television signal in a first format is separated into a first signal portion carrying television information and a second signal portion carrying control data. The first signal portion is reformatted into a second format. The second signal portion is combined with the reformatted first signal portion to provide a second television signal. In this manner, a plurality of television signals having different formats can be transmitted with common control data, e.g., for controlling access to television programming.

REFERENCES:
patent: 4747138 (1988-05-01), Marie et al.
patent: 4833710 (1989-05-01), Hirashima
patent: 5046090 (1991-09-01), Walker et al.
patent: 5051827 (1991-09-01), Fairhurst
Brochure--Philips BSB Satellite Receiver Model STU902.
Brochure--CEL Electronics Ltd. Model P156-2 Television Standards Converter.
Brochure--Video International Model DTC 1504 Television Standards Converter.

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