| 摘要 |
PURPOSE:To enable the display of a signal obtained from a sweep reception circuit whose sweeping time is different from the deflection time of a CRT display unit, by a method wherein a sweep reception signal is subjected to A/D conversion and stored and this stored signal is read out and sent to the CRT display unit. CONSTITUTION:Frequency sweeping-receiving circuits 1A-1C sweep and receive electric waves in frequency bands different from each other and input reception signals 102-302 and sweep signals 101-301 in a sweep conversion circuit 3. Waveform memory circuits 3A-3C subject the reception signals to A/D conversion in A/D conversion circuits 3A2-3C2 synchronously with the sweep signals, and write them in memory circuits 3A3-3C3. When the next sweep signals come, the contents of the memory circuits 3A3-3C3 are written in memory circuits 3A4-3C4, and then the subsequent A/D conversion and writing in memories are started. In parallel with these operations, the contents of the memory circuits 3A4-3C4 are read out by a signal being synchronous with the deflection time of a CRT display unit 2, and are inputted in the CRT display unit 2 via a D/A conversion circuit 3D2. |
