Browse Prior Art Database

Character Generator Multiscan Pel Buffer

IP.com Disclosure Number: IPCOM000048313D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Finlay, DE: AUTHOR [+2]

Abstract

The above block diagram shows a character generator for a faster scan printer, for example, a laser printer. Under the control of a processor 10, data to be reproduced by the laser beam is loaded into the page buffer 12. The scan assembly logic (SAL) 14 accesses the page buffer and generates font addresses. The font addresses are loaded into block 16. The font data manipulator 18 under the control of controller 20 generates the picture element (pel) pattern to be printed by the laser beam. To speed up the performance of the system and at the same time utilize relatively slow memories, at least two scan buffers, identified as block 22, are interconnected to the font data manipulator 18 and the serializer 24. Multiple parallel scans of a character are loaded from the font data manipulator 18 into one of the scan buffers 22.

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Character Generator Multiscan Pel Buffer

The above block diagram shows a character generator for a faster scan printer, for example, a laser printer. Under the control of a processor 10, data to be reproduced by the laser beam is loaded into the page buffer 12. The scan assembly logic (SAL) 14 accesses the page buffer and generates font addresses. The font addresses are loaded into block 16. The font data manipulator 18 under the control of controller 20 generates the picture element (pel) pattern to be printed by the laser beam. To speed up the performance of the system and at the same time utilize relatively slow memories, at least two scan buffers, identified as block 22, are interconnected to the font data manipulator 18 and the serializer 24. Multiple parallel scans of a character are loaded from the font data manipulator 18 into one of the scan buffers 22. The serializer 24 then accesses the loaded scan buffer, which contains two or more complete scans, to generate serial data which controls the laser beam. While the serializer is extracting data from the loaded scan buffer, data is being transported from the font data manipulator 18 to the second scan buffer. As soon as the data in the first scan buffer is processed, the serializer shifts to process data in the second scan buffer. Likewise, while the second scan buffer is unloaded, data is again loaded into the first scan buffer. By using multiple scan buffers and transferring multiple scans of a character...