Travelling wave digitizer

Details Travelling wave digitizer Travelling wave digitizer

1979-08-27

1981-03-10

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

178 18, 340347AD, G08C 2100

Patent

active

042556171

ABSTRACT:
A digitizer shifts long and short wavelength square waves across x and y grids in a platen to perform upon a cursor signal time measurements that represent coarse and fine cursor position data. The periodic staircase cursor signal is filtered before use to permit time measurements that resolve cursor positions to locations between lines in the grids. The contribution of the filter to the coarse and fine time measurements is obtained in a special reference measurement, so that it may be removed. A processor combines these data into Cartesian coordinates, and implements procedures for error reduction. These include averaging of consecutive time measurements, dynamic adjustment of a timing reference to remove ambiguities inherent in measuring very small or very large cyclic quantities, and correction of coordinates for the effects of cursor motion during measurement and for any non-perpendicularity of the x and y grids.

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