Signal preconditioning for touch entry device
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United States of America Patent
Stats
-
Aug 4, 1987
Grant Date -
N/A
app pub date -
Feb 28, 1986
filing date -
Feb 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A touch entry system employing arrays of emitter and detector opto devices located around the periphery of an irradiated field detects intrusion of an opaque element such as a stylus within the field. The detector analog output is converted to a digital signal for input into a microprocessor. Digital signals input into the microprocessor can vary due to inconsistencies in conventional opto devices. A programmable amplifier responsive to the microprocessors preconditions the analog signals prior to analog to digital conversion to bring all digital signals corresponding to the unblocked emitter beam condition within a normalized range before input into the microprocessor.
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