Two-dimensional pattern digitizer

Details Two-dimensional pattern digitizer Two-dimensional pattern digitizer

1995-06-20

1998-07-21

Saras, Steven J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

178 18, 178 19, 341139, 341158, 341172, G09G 302, G08C 2100

Patent

active

057840539

ABSTRACT:
A digitizer includes a reference level generator for generating a reference level, a comparator for comparing a signal level of the analog input with the reference level to provide a digitized output, a first detecting circuit for detecting a moderate change in the signal level of the analog input so as to change the reference level in accordance with the detected moderate change in the signal level of the analog input, and a second detecting circuit for detecting a rapid change in the signal level of the analog input so as to change the reference level in accordance with the detected rapid change in the signal level of the analog input.

REFERENCES:
patent: 3591718 (1971-07-01), Asano
patent: 3918050 (1975-11-01), Dorsman
patent: 4103234 (1978-07-01), Frazier
patent: 4297680 (1981-10-01), Koeman
patent: 4717793 (1988-01-01), Kobayashi
patent: 4901078 (1990-02-01), Goyal
patent: 5010346 (1991-04-01), Hamilton et al.
patent: 5121119 (1992-06-01), Higuchi
patent: 5159340 (1992-10-01), Smith

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