Inductively coupled keyboard
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United States of America Patent
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Nov 15, 1994
Grant Date -
N/A
app pub date -
Mar 15, 1993
filing date -
Mar 15, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A self-contained keyboard for computer transmits keystroke data to a host computer via scan codes encoded in a variable magnetic field. In a preferred embodiment the keyboard generates magnetic bursts by electrical current bursts in a loop of a electrical conductor. A receiving loop connected to demodulator circuitry in the body of the computer produces emf spikes according to the magnetic bursts transmitted from the keyboard. The demodulator circuitry reproduces digital scan codes in a register for communication to the computer CPU according to the emf spikes monitored from the receiving loop.
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