FIELD: information technology.
SUBSTANCE: apparatus for entering information into a computer (digitiser) has two or more indicators with different excitation frequencies of electromagnetic coils, a pad, as well as an amplifier, a tuneable narrow-band frequency filter which enables to pick up signals from each of the indicators, as well as a microcontroller which uses an algorithm to realise a method for accurate determination of absolute coordinates of each of the indicators within the working region.
EFFECT: possibility of operation of the input apparatus with more than one indicator.
5 dwg
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|---|---|---|---|
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| DEVICE FOR READING PICTURES OF OBJECTS | 1993 |
|
RU2067775C1 |
