Touch sensing method and apparatus

Details Touch sensing method and apparatus Touch sensing method and apparatus

1995-06-07

1998-08-04

Brier, Jeffrey

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345161, 178 18, G08C 2100

Patent

active

057901074

ABSTRACT:
Method and apparatus for determining small variations in capacitance, typically in a capacitive touch sensing device, includes a reference signal of a first frequency and a sample signal of a second frequency. The reference and sample signals are mixed and filtered to isolate the beat frequency therebetween, which is then measured to provide an indication of the variation in the sample frequency. The measurement can then be manipulated by a microprocessor or microcontroller to provide desired control signals. The apparatus is susceptible of digital implementation and single chip implementation.

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Synaptics Brochure, "Synaptics Touch Pad," pp. 1-39.

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