The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1994
Filed:
Nov. 06, 1992
Terrence J Knowles, Hanover Park, IL (US);
Del Ogren, Deerfield, IL (US);
Carroll Touch, Round Rock, TX (US);
Abstract
A controller for an acoustic wave touch panel includes a signal conditioning circuit that can receive and process X axis and Y axis sense signals from the touch panel where the touch panel can be configured with either one or two transducers per sense axis. The signal conditioning circuit includes a differential amplifier to which simultaneously received X axis and Y axis sense signals are applied to provide common mode rejection. The controller also includes a touch position detector that accurately determines the position and pressure of a touch without jitter, the touch position detector including a software low pass filter and peak detector for analyzing the output of the signal conditioning circuit.