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:
May. 01, 1990
Filed:
Mar. 23, 1989
Christopher M Engel, Arlington Heights, IL (US);
Khosro M Rabii, Arlington Heights, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A digital auto tracking system compares sampled operating data from a CRT with corresponding reference data and develops an error signal therefrom. The error signal is truncated to produce a desensitized three bit error signal. Three AND gates each have one input supplied with the three error bits, respectively, and three programmable velocity control bits are supplied to the other inputs by a microprocessor. A demultiplexer has a plurality of input taps that are coupled together so as to provide a minimum of zero and a maximum of seven clock pulses depending upon the outputs of the AND gates. The clock pulses sequence up/down counters in accordance with the derived error signal. The speed or velocity of change in response to the error signal is determined by the velocity control bits which may be microprocessor controlled for optimum block and white tracking of the particular cathode ray tube.