Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2006-07-18
2011-11-01
Charioui, Mohamed (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S065000, C702S068000, C702S116000
Reexamination Certificate
active
08050876
ABSTRACT:
Improved capacitive sensor operation is achieved with improved discrimination between environmental drift and apparent drift attributable to human proximity to the sensor. A proximity algorithm detects conditions interpreted as indicating a user is close to, but not touching, a sensor. When such proximity is detected, ambient value calibration is halted, thereby avoiding treating the human's proximity as environmental drift requiring compensation and preventing miscalculation of calibration. The proximity algorithm employs two moving-average filters (implemented in hardware or software) to monitor the CDC output values over time and to make appropriate adjustments to a signal representing the ambient, while distinguishing environmental drift from proximity-induced pseudo-drift. Accurate ambient values allow for improved proximity detection by providing this environmentally compensated average value to an adaptive threshold algorithm which features a fast attack, slow decay peak detection to automatically track and compensate for different response characteristics (typically finger sizes).
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Cleary John Anthony
Coquerel Laurent
Feen Ken
Jeyapaul Richardson
Analog Devices Inc.
Charioui Mohamed
Knobbe Martens Olson & Bear LLP
Suarez Felix
LandOfFree
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