| 摘要 |
Front-end system for the conversion of graphical data and coded font data into a serial pixel-bit stream for a raster output scanner (ROS) in order to obtain a printed page, comprising: - a front-end controller (10) for controlling the front-end system, - an input/output processor (11) which can be connected to a computer or to a data network, - a memory (12, 13) for the storage of graphical data and coded font data, supplied via the input/output processor (11), for a page to be assembled and for the storage of program data for the front-end controller (10), - a raster image memory (16) (RIM) for the storage of the bit representation of a complete page to be printed, each memory element corresponding to a position on the page to be printed, - a raster image processor (15) (RIP) for expanding the data for a page to be assembled and the placing of the bit representation thereof in the raster image memory (16) and for the conversion of said stored bit representation of the page to be printed into a serial pixel-bit stream for supply to the raster output scanner (20), in which the front-end controller (10), the input/output processor (11), the memory (12, 13) and the raster image processor (15) are connected to each other via a first bus system (14), and in which the raster image processor (15) and the raster image memory (16) are connected to each other by a second bus system (17) (RI bus). |
