Patent ID: 8537141
Filing Date: 2013-09-17
Classification: G06F,G06K,G07C

Abstract:
1. A method of operating a digital signature collection system comprising: during creation of a signature, receiving ultrasonic energy from an ultrasonic transmitter of an implement at a plurality of ultrasonic receivers; during creation of the signature, receiving pressure information at a higher frequency receiver, wherein the pressure information is based on digital output from an analog-to-digital (A/D) convertor, the digital output is based on an analog signal from a pressure sensor, the analog signal has an amplitude that is proportional to the amount of pressure applied by a tip of the implement, and the pressure information describes different amounts of pressure applied by the tip of the implement at different times during creation of the signature; determining a plurality of locations of the ultrasonic transmitter versus time, from the ultrasonic energy to determine a signature shape; determining a plurality of pressure measurements versus time, from the pressure information, wherein the pressure measurements describe at least first and second amounts of pressure, the first amount corresponds to at least enough pressure to denote contact between the tip of the implement and a surface, and the second amount corresponds to a greater amount of pressure than the first amount; and creating a digital representation of the signature, based on the determined locations and pressure measurements, wherein the digital representation comprises: shape data pertaining to the plurality of locations of the ultrasonic transmitter; and pressure data pertaining to the plurality of pressure measurements, wherein the pressure data describes the at least first and second amounts of pressure.