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Pitch Change During Overstrike

IP.com Disclosure Number: IPCOM000042333D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Czyszczewski, JS: AUTHOR [+4]

Abstract

This article describes a technique which improves alignment of overstrike characters and base characters where a pitch change has occurred in high speed printers in word or data processing systems. Printers with text formatters support a continuous overstrike function. Normally, text to be overstruck is marked by a begin and end control. When the line is being printed and the end overstrike control is processed, the printer backs up and overstrikes from the begin point to the end point. A problem arises when there is a pitch change in the text field that is overstruck since the overstriking is normally done in the pitch that is in effect when the ending control is processed.

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Pitch Change During Overstrike

This article describes a technique which improves alignment of overstrike characters and base characters where a pitch change has occurred in high speed printers in word or data processing systems. Printers with text formatters support a continuous overstrike function. Normally, text to be overstruck is marked by a begin and end control. When the line is being printed and the end overstrike control is processed, the printer backs up and overstrikes from the begin point to the end point. A problem arises when there is a pitch change in the text field that is overstruck since the overstriking is normally done in the pitch that is in effect when the ending control is processed. The problem is that the text printed before the pitch change is in a different pitch when compared with the pitch of the characters used to overstrike this part of the line. The improved method to properly align overstrike characters in spite of midline pitch changes prints the overstrikes as a separate pass through the line which allows the pitch to be tracked at each character in the line of text. The overstrike pass consists of sequentially processing each control and graphic in the line while inhibiting printing of text. As the line is processed, a variable is updated to indicate the current pitch. When a begin overstrike control is processed, the starting position is saved. When the matching end overstrike control is processed, the text between the begin an...