| 摘要 |
<p>PURPOSE:To simultaneously determine the state of the whole and that of a detailed part by providing two kinds of scanning conversion circuits and simultaneously displaying plan position indication pictures different in a display scale on the same cathode ray tube in a divided state. CONSTITUTION:The video signal 11 from radar is converted from radar coordinates to X-Y coordinates on the basis of the radar azimuth at that time and a synchronous signal 12 such as a transmission trigger by scanning conversion circuit 1A, 1B to be written in display memories 2A, 2B by the restriction of a writing control circuit 3. The operation of the circuits 1A, 1B at this time is controlled by the circuit 3, and the magnifying power of a predetermined formula and off-center coordinates are changed corresponding to a display scale and an off-center position. The contents of the memories 2A, 2B are read in synchronous relation to TV canning by the control of a reading control circuit 4 and either one of them is selected by a display memory selection circuit 6 to be displayed on a cathode ray tube 5. The selection of the memories in the circuit 6 is performed on the basis of the addresses of the memories 2A, 2B and, for example, the circuit 6 is operated so that the left half of the cathode ray tube selects the memory 2A and the right half thereof selects the memory 2B.</p> |
