Method and device for signal protection

Details Method and device for signal protection Method and device for signal protection

2008-04-08

2008-04-08

Kindred, Alford (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

C341S024000, C341S026000, C363S039000, C363S047000, C710S065000, C710S067000

Reexamination Certificate

active

07356626

ABSTRACT:
Method for decreasing the existence of externally detectable revealing signals, so-called {umlaut over (R)}Ö{umlaut over (S)}, from keyboards (1), e.g. for computers, where the keyboard is fed with signals, so-called matrix signals, which are detected for detection of activity regarding the keys (2) of the keyboard, whereby said matrix signals are generated by means of signal devices. The method is especially characterized in that the matrix signals are high-frequency filtered before they are fed to the keyboard.

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