초록 ▼

A digital scan converter is provided with a memory, each cell of which contains brightness data for presenting a corresponding video signals on a raster scan display at positions corresponding with the respective cells; a logical unit for supplying, in response to the applied video signals and the b

A digital scan converter is provided with a memory, each cell of which contains brightness data for presenting a corresponding video signals on a raster scan display at positions corresponding with the respective cells; a logical unit for supplying, in response to the applied video signals and the brightness data stored in memory, new brightness data overwriting that stored in memory; an address conversion circuit for converting the addresses established in polar coordinates into addresses expressed in Cartesian coordinates to store the new brightness data in memory; and with a circuit connected to the memory for reading out the brightness data and for presenting corresponding video signals on the raster scan display. To renew the stored brightness data synchronously with the radar scans such that a prefixed persistence appears on the raster scan display, the digital scan converter comprises a control unit for supplying persistence data and azimuth values to process the persistence data and a control code register for storing the persistence data in intervals between successive radar scans. Furthermore, in said interval the latter azimuth values are supplied to the address conversion circuit for generating the addresses of the memory cells and the contents of said memory cells are adapted to the persistence data in the control code register by means of the logical unit communicating with said control code register.

대표청구항 ▼

Digital scan converter for a pulse radar apparatus provided with: a random-access memory (1), each cell of which containing brightness data; a circuit (3) connected to the memory (1) for reading out the brightness data and for presenting corresponding video signals on a raster scan display (2) at po

Digital scan converter for a pulse radar apparatus provided with: a random-access memory (1), each cell of which containing brightness data; a circuit (3) connected to the memory (1) for reading out the brightness data and for presenting corresponding video signals on a raster scan display (2) at positions corresponding with the respective cells; a control unit (15) for supplying persistence data and address information to process the persistence data; switching means (17) for passing either radar video signals or the persistence data; and a logical unit (7) for supplying, in response to the radar video signals and the persistence data, respectively, and to the brightness data stored in memory (1), new brightness data overwriting that stored in memory (1), whereby the memory positions are determined by an address conversion circuit (10) which converts the radar video addresses and the persistence data addresses established in polar coordinates by the pulse radar apparatus and the control unit (15), respectively, into addresses expressed in Cartesian cordinates, characterised in that, to renew the stored brightness data, either simultaneously with a radar scan or between the generation of two successive radar scans, synchronously with a radar scan in obtaining a desired persistence on the raster scan display (2), the digital scan converter is provided with: a control code circuit (21) for supplying, in response to signals form the control unit (15) determining the conditions for and the frequency of the persistence data processing, a signal to indicate that only a radar scan must be presented on the display, a signal to indicate that simultaneously and in the same sequence therewith persistence data must be processed, or a signal to indicate that only persistence data must be processed in the same sequence as a radar scan; and a control code register (19) in which the signals supplied via the switching means (17) are supplemented with the output signals of the control code circuit (21).