The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 1994
Filed:
Nov. 18, 1992
Applicant:
Inventors:
Assignee:
TriTech Microelectronics International Pte Ltd, Singapore, SG;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08C / ;
U.S. Cl.
CPC ...
178 19 ; 345173 ;
Abstract
A digital tablet of the type that multiplexes pen position signals has filtering and digitizing circuits arranged in separate channels for each of the signals that is to be multiplexed. The tablet pen is connected to receive an oscillator signal and the signal is picked up at each of the four corners of the tablet and applied to the corresponding channel. The separate channels permit the filters to be made sharper. The disclosure also includes improved circuits for processing the pen position signals.