Capacitive-based touch apparatus and method with reduced interference

Capacitive-based touch apparatus and method with reduced interference

A touch-sensitive apparatus includes a touch panel comprising a touch sensitive surface and at least one a drive electrode capacitively coupled to at least one receive electrode. A sense circuit generates a response signal for the receive electrode in response to a drive signal delivered to the driv...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Geaghan, Bernard O, Rebeschi, Thomas J, Cordeiro, Craig A
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:A touch-sensitive apparatus includes a touch panel comprising a touch sensitive surface and at least one a drive electrode capacitively coupled to at least one receive electrode. A sense circuit generates a response signal for the receive electrode in response to a drive signal delivered to the drive electrode. A measurement circuit applies a time-varying transfer function to the response signal. The transfer function varies proportionately and synchronously with the response signal. A calibration circuit is used to match the time-varying transfer function to the response signal.