Low-pass filter of graphical tablet has cut-off frequency lower

Details Low-pass filter of graphical tablet has cut-off frequency lower Low-pass filter of graphical tablet has cut-off frequency lower

1996-02-20

1998-06-16

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 19, 345173, 345174, G08C 2100, G09G 302

Patent

active

057674582

ABSTRACT:
A graphical tablet includes a pair of parts to be brought into electrical contact with one another under user-interaction. Electrical signals are generated indicative of X and Y coordinates of the contact. The signals are filtered by a low-pass filter. The filtered X and Y signals are sampled with a particular sampling frequency and are held in separate X and Y holding circuits. The cut-off frequency of the filter is at least part of the time substantially lower than the sampling frequency, as each holding circuit has to settle for only increments and decrements relative to its stored sample value. Thus the spectrum of noise rejection is widened with respect to the prior art.

REFERENCES:
patent: 4581483 (1986-04-01), Ralston
patent: 4616107 (1986-10-01), Abe
patent: 4752655 (1988-06-01), Tajiri et al.
patent: 5225636 (1993-07-01), Protheroe
patent: 5231381 (1993-07-01), Duwaer
patent: 5359156 (1994-10-01), Chan et al.
patent: 5528002 (1996-06-01), Katabami
patent: 5600105 (1997-02-01), Fukuzaki

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