Abstract: An electromagnetic interactive whiteboard system includes a first electronic pen (16) constructed and arranged to operate at a first frequency (F1). At least a second electronic pen (18) is constructed and arranged to operate at a second frequency (F2) that is different from the first frequency. An electromagnetic interactive whiteboard (12) has a single conductive grid (14) constructed and arranged to receive electromagnetic signals from the pens due to proximity of the pens to the grid. A circuit (30) separates the first and second frequencies into their respective X and Y component frequencies when the pens are operating simultaneously. A controller (20) receives a signal including the separated X and Y component frequencies of each of the first and second pens to detect each pen and to determine an X and Y coordinate position of each pen relative to the grid based on the X and Y component frequencies.

Abstract: An electromagnetic interactive whiteboard system includes a first electronic pen (16) constructed and arranged to operate at a first frequency (F1). At least a second electronic pen (18) is constructed and arranged to operate at a second frequency (F2) that is different from the first frequency. An electromagnetic interactive whiteboard (12) has a single conductive grid (14) constructed and arranged to receive electromagnetic signals from the pens due to proximity of the pens to the grid. A circuit (30) separates the first and second frequencies into their respective X and Y component frequencies when the pens are operating simultaneously. A controller (20) receives a signal including the separated X and Y component frequencies of each of the first and second pens to detect each pen and to determine an X and Y coordinate position of each pen relative to the grid based on the X and Y component frequencies.

Abstract: A collaborative input system 10 includes a host computer 12. A display 14 is associated with the host computer. The host computer includes a processor 15 configured for executing an application to provide an image 17 on the display 14. At least one electromagnetic digitizer 18 is provided separate from the host computer. The digitizer 18 has an input surface 22 defining a display space that is mapped to coincide with the display 14, and a pen structure 24 operatively associated with the input surface such that proximity of the pen structure with respect to the input surface, as a result of a user's input, is detected by the digitizer.

Abstract: A collaborative input system 10 includes a host computer 12. A display 14 is associated with the host computer. The host computer includes a processor 15 configured for executing an application to provide an image 17 on the display 14. At least one electromagnetic digitizer 18 is provided separate from the host computer. The digitizer 18 has an input surface 22 defining a display space that is mapped to coincide with the display 14, and a pen structure 24 operatively associated with the input surface such that proximity of the pen structure with respect to the input surface, as a result of a user's input, is detected by the digitizer.