Telegraphy – Systems – Position coordinate determination for writing
Patent
1995-05-03
1997-11-25
Kuntz, Curtis
Telegraphy
Systems
Position coordinate determination for writing
345175, G08C 2100
Patent
active
056915128
ABSTRACT:
A position transducer, and a noise elimination method for eliminating a noise component included in a received signal of the position transducer irrespective of the frequency band of the noise component. A position transducer calculates coordinates of a position indicator by effecting predetermined signal processing on the basis of a received signal developed in one of a plurality of loop coils, arranged side by side, as a result of electromagnetic interaction between the loop coil and the position indicator. The position transducer is further provided with a subtraction means which extracts an amplitude level corresponding to the signal developed in the loop coil only resulting from the electromagnetic interaction, for each loop coil, by subtracting a noise level obtained from a signal received when a transmission means interrupts transmission, from a signal received when the transmission means carries out transmission.
REFERENCES:
patent: 4736073 (1988-04-01), Abernathy
patent: 4859814 (1989-08-01), Sciacero et al.
patent: 5359156 (1994-10-01), Chan et al.
patent: 5365253 (1994-11-01), Cheng et al.
patent: 5410750 (1995-04-01), Cantwell et al.
Kuntz Curtis
Loomis Paul
Wacom Co. Ltd.
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