| 摘要 |
A method and apparatus for detecting when a second object touches a digitizing panel while a first object is touching the digitizing panel is disclosed. The method includes the steps of generating a first composite signal when the first object touches the digitizing panel, the composite signal including a first touch-down signal component and an offset signal component, converting the first composite signal to a first digital value indicative of an amplitude of the first composite signal, filtering the first digital value to filter out the offset signal component and to output the first touch-down signal component, generating a second composite signal when the second object touches the digitizing panel, the second composite signal including a second touch-down signal component and the first composite signal, converting the second composite signal to a second digital value indicative of an amplitude of the second composite signal, and filtering the second digital value to filter out the first composite signal and to output the second touch-down signal component.
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