| 摘要 |
A movable data entry device is provided which has two output elements separated from each other. Each of the output elements are repeatably powered to send a repeated signal from the device, and power between each of the elements is toggled. As the data entry device is moved along a path on a writing area of a surface, such as a white board, a transmitted signal is alternately sent from the first output element and the second output element, and is received by two or more external receivers. Triangulation methods are used to determine the location of output elements on the movable data entry device, in relation to the writing area. The output elements are preferably ultrasonic transducers. The received signals are used to define the path and orientation of the data entry device. In a preferred embodiment, successive triangles are defined by successive locations of the two output signals. The area defined by the triangles is then used to define the path of the data entry device within the writing area. When the data entry device is used as an erasing implement, the defined triangular areas are used to erase, or remove described written symbols or paths from memory. When the data entry device is used as a marking implement, the defined path is preferably used to create calligraphic effects. Alternative embodiments allow the transmission of supplementary information from the movable implement to the receivers, using either the first and/or second output signals, such as marking or erasing or marking functions, determined pen color, stroke bias, fill color, line style, and implement user identification. |
