Method for preventing unauthorized duplication of a remote contr

Details Method for preventing unauthorized duplication of a remote contr Method for preventing unauthorized duplication of a remote contr

1995-08-29

1997-10-07

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 34082569, 34082572, 380 3, 380 5, G06F 100, G11B 502

Patent

active

056753233

ABSTRACT:
In a method and a remote controller for preventing unauthorized duplication of the remote controller by a copying apparatus, a copy-preventing signal is inserted at a control signal which is generated and transmitted by the remote controller and which is to be received by a corresponding receiver unit for remote control operation of an appliance that is connected to the receiver unit. The copy-preventing signal is inserted at one of the low logic bits of the control signal immediately following a high logic bit of the latter. The combination of the high logic bit and the copy-preventing signal has a duration within a noise threshold of the receiver unit such that the receiver unit can correctly identify the combination of the high logic bit and the copy-preventing signal as a single high logic bit while the copying apparatus misinterprets the combination of the high logic bit and the copy-preventing signal as two high logic bits.

REFERENCES:
patent: 3963865 (1976-06-01), Songer
patent: 4040099 (1977-08-01), Cook
patent: 4785361 (1988-11-01), Brotby
patent: 4945563 (1990-07-01), Horton et al.
patent: 5113438 (1992-05-01), Blokker, Jr. et al.
patent: 5182680 (1993-01-01), Yamashida et al.
patent: 5237319 (1993-08-01), Hikada et al.
patent: 5537216 (1996-07-01), Yamashida et al.

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