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, 1983
Filed:
Jul. 09, 1981
Joachim Heinzl, Munich, DE;
Klaus P von Borstel, Pullach, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A method and apparatus for representing gray scale values in facsimile transmission wherein the gray scale values are produced by a number of dots of equal size per unit area on a recording medium prints the dots in consecutive lines which are displaced by constant distances in order to avoid the generation of dashes running perpendicular to the advancing direction of the printing head. The displacement of the consecutive lines is achieved by the addition of different size constant values to the sums of instantaneous values of the gray scale value signals which correspond to the printed gray scale values. The sums corresponding to different lines thus attain a threshold value at different points in time and a dot is printed upon each attainment of the threshold value. The sums are simultaneously decreased by the threshold value. Whenever a black gray scale value occurs, the sum is completely erased.