KEYBOARD SENSOR SYSTEMS AND METHODS
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United States of America Patent
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Issued Date -
Jun 22, 2023
app pub date -
Jan 18, 2023
filing date -
Dec 20, 2017
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Abstract
A sensing system for a keyboard. Each key sensor comprises passive and active resonant circuits. The passive resonant circuit has a resonant frequency and the active resonant circuit excites the passive resonant circuit at the resonant frequency. A sensor driver drives the active resonant circuit with an RF drive signal, a multiplexing system multiplexes the drive signal such that simultaneously driven key sensors are separated by at least (k-1) keys, and a detector detects a level of RF signal from a driven key sensor for sensing a position and/or velocity of a key.
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