| 摘要 |
<p>The vertical and/or horizontal synchronizing frequencies of red (R), green (G) and blue (B) video signals are detected by a frequency detector (5). A measure of the resolution of the RGB video signals (e.g. lines per field) is calculated from them by a calculator (6). When the resolution of the RGB video signals is close to the resolution of a cathode-ray-tube (CRT) 4, a high level signal is generated as a control signal from a control signal generator (7). In response to this the video bandwidth of the RGB video signals is limited by a video bandwidth limiting circuit (2), to thus adapt the RGB video signal to characteristics of the CRT. <IMAGE></p> |
