Patent Document ID: 20100108410
Application ID: 12263574
Patent Status: 0

Claim One:
1 An electromagnetic manuscript input method, applicable for an electromagnetic manuscript input apparatus comprising an electromagnetic pen and a digitizer to obtain coordinates of the electromagnetic pen on the digitizer, the electromagnetic manuscript input method comprising: emitting a driving control signal by a coordinate controller of the digitizer, to drive a driving circuit of the digitizer, thus emitting a driving signal by the driving circuit to one of a plurality of horizontal windings and one of a plurality of vertical windings of the digitizer, wherein the horizontal windings are parallel arranged along a horizontal direction of the digitizer, and the vertical windings are parallel arranged along a vertical direction of the digitizer; detecting an induction potential with a detection circuit of the digitizer, wherein the induction potential is generated according to an induction of the driven horizontal winding or the driven vertical winding to an electromagnetic wave emitted by from the electromagnetic pen; converting the induction potential into a digital signal with an analog-to-digital (ADC) converter, and transmitting the digital signal to the coordinate controller, wherein the coordinate controller comprises a processor; recording the digital signal by the processor in the coordinate controller, and transmitting another driving control signal to another horizontal winding or another vertical winding; performing a detection and conversion operation with the detection circuit and the ADC, to generate another digital signal and transmit the another digital signal to the coordinate controller; comparing the digital signal with the another digital signal to find out a larger one, and recording the larger one of the digital signal and the another digital signal, by the processor of the coordinate controller; transmitting another different driving control signal by the coordinate controller, and performing a detection and conversion operation to the another different driving control signal with the detection circuit and the ADC, to generate a digital signal corresponding to the another different driving control signal, and comparing the digital signal corresponding to the another different driving control signal with the recorded larger one of the digital signal and the another digital signal to find out a larger one therebetween serving as an updated larger one digital signal until all of the horizontal windings and the vertical windings have been conducted with such driving operations; setting the horizontal winding and the vertical winding which correspond to the finally updated larger one digital signal after all of the horizontal windings and the vertical windings have been conducted with such driving operations as the horizontal winding and the vertical winding having a maximum induction potential, by the processor of the coordinate controller, and recording a maximum horizontal position and a maximum vertical position corresponding the horizontal winding and the vertical winding having the maximum induction potential to the with the processor; obtaining two adjacent horizontal positions and two adjacent vertical positions, immediately adjacent to the maximum horizontal position and the maximum vertical position, respectively, and recording the three horizontal positions and the three vertical positions with the processor; emitting corresponding driving signals according to the three horizontal positions and the three vertical positions by the processor of the coordinate controller, and recording six corresponding induction potentials with the processor; and calculating the coordinates of the electromagnetic pen with a coordinate algorithm corresponding to a Gauss distribution function of the induction potentials, wherein the coordinate algorithm comprises log, multiply, and add operations.