Digitizer tablet with reduced radiation susceptibility
First Claim
1. A method of operating a digitizer tablet employing an electrode array adjacent a working surface and a pointing device wherein the electrode array is scanned at a given scan rate to obtain signals representative of the position of the pointing device over the working surface, said signals after processing including filtering being outputted for use by a controlled display to produce on the display objects representative of the pointing device position, said display objects exhibiting undesired wobble, the steps comprising:
- (a) introducing controlled delay to modify the tablet scan rate to reduce or eliminate the wobble.
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Accused Products
Abstract
A digitizer tablet capable of reduced coordinate wobble due to beat interference between an induced display scan rate and the tablet scan rate by introducing a controlled delay to change the time between successive samples to increase the beat frequency to the point where it can be effectively filtered out.
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Citations
16 Claims
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1. A method of operating a digitizer tablet employing an electrode array adjacent a working surface and a pointing device wherein the electrode array is scanned at a given scan rate to obtain signals representative of the position of the pointing device over the working surface, said signals after processing including filtering being outputted for use by a controlled display to produce on the display objects representative of the pointing device position, said display objects exhibiting undesired wobble, the steps comprising:
(a) introducing controlled delay to modify the tablet scan rate to reduce or eliminate the wobble. - View Dependent Claims (2, 3, 4)
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5. A digitizer tablet comprising:
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(a) an electrode array adjacent a working surface of the tablet, (b) a pointing device, (c) means for scanning the electrode array at a given scan rate which, when the pointing device is activated, produces desired signals representative of the position of the pointing device over the tablet working surface, (d) means including filtering means for processing said desired signals to convert same into coordinate values representative of the pointing device position with respect to at least one coordinate of a coordinate system associated with the tablet working surface, (e) means for outputting the said coordinate values to a display device for displaying objects representative of said coordinate values, said displayed objects exhibiting wobble, (f) means for introducing delay to modify the tablet scan rate in a direction to reduce or eliminate the wobble. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification