Uniquely identifiable keys for electronic keyboards
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United States of America Patent
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Oct 21, 2014
Issued Date -
N/A
app pub date -
Nov 23, 2007
filing date -
Nov 23, 2007
priority date (Note) -
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Abstract
An electronic keyboard including a plurality of keys arranged as a matrix, each key including a plunger, and a conductive element on the bottom of the plunger, the conductive element having a characteristic resistance, an electronic circuit having an input current source, and mounted on a surface beneath the plurality of keys such that when a key is pressed its conductive element closes a switch in the circuit, an analog-to-digital convertor for converting an output voltage of the circuit to a digital signal, and a controller for determining from the digital signal when a key is pressed, and for identifying the key that is pressed.
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