Communications: electrical – Digital comparator systems
Patent
1980-06-20
1982-08-17
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
178 19, G06K 922
Patent
active
043452396
ABSTRACT:
An apparatus for determining pen acceleration for use in a signature vertification system. Capacitive transducer means are mounted in a pen, and change capacitance by an amount which is proportional to pen acceleration. A Blumlein bridge circuit is utilized to measure changes in the capacitance of the transducer means, and the output of the bridge is amplified and demodulated to result in a signal which is proportional to acceleration.
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Boudreau Leo H.
International Business Machines - Corporation
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