Compensated transformer matrix keyboard with phase detection

Details Compensated transformer matrix keyboard with phase detection Compensated transformer matrix keyboard with phase detection

G - Physics

06

F

340/177

G06F 3/023 (2006.01) H03K 17/972 (2006.01)

Patent

CA 1175527

Summary In a contactless keyboard including for each key a transformer (1) with a core (7) displaceable by the key operation and including a com- pensation transformer (2) common to all keys the compensation transformer is so designed that with an unactuated key the signal component of the compensation transformer in the signal applied to the evaluation circuit exceeds the component of the key transformer, whereas with an actuated key the signal component of the key transformer predominates. Therefrom results a phase change of the signal applied to the evaluation circuit with the actuation of a key. The evaluation circuit compares the phase of the key output signal with that of a reference signal. For increasing the immunity from disturbance the evaluation circuit delivers an output signal (key operated or key nonoperated) only when several successive comparison operations give the same result.

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