METHOD AND APPARATUS FOR SCRAMBLING AND DESCRAMBLING TELEVISION SIGNALS - Patent 0222818

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EP 0 222 818 A1

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(43)	Date of publication:
	27.05.1987 Bulletin 1987/22

(21)	Application number: 86902982.0

(22)	Date of filing: 21.04.1986

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International Patent Classification (IPC):

H04L 9/ 00^{( . )}

H04N 7/ 167^{( . )}

(86)	International application number:
	PCT/US1986/000801

(87)	International publication number:
	WO 1986/007224 (04.12.1986 Gazette 1986/26)

(84)	Designated Contracting States:
	AT BE CH DE FR GB LI LU NL SE

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Priority:

24.05.1985 US 19850737599

(71)	Applicant: SCIENTIFIC ATLANTA, INC.
	Atlanta, GA 30348 (US)

(72)	Inventor:
	LUCAS, Keith Oak Ridges, Ontario LOG 1PO (CA)

(74)	Representative: Moore, Derek, et al
	Jensen & Son 70 Paul Street London EC2A 4NA London EC2A 4NA (GB)

(54)	METHOD AND APPARATUS FOR SCRAMBLING AND DESCRAMBLING TELEVISION SIGNALS