| 摘要 |
<p>A method and apparatus for reformatting MAC color television signal to reduce bandwidth. Chrominance and luminance components are serially arranged on a line by line basis with the luminance component not compressed or minimally compressed. The aspect ratio is reduced from the standard aspect ratio by a gate (5) which truncates the edges and feeds the MAC signals into memories (10, 11) for subsequent time expansion. Since a normal television picture tube overscans, the edges of the picture are never displayed and need not be transmitted or recorded. The reformatted signal can be made compatible with a standard composite signal by merely expanding (22) and modulating the chrominance and adding to the luminance (25). The compatible signal has a shorter active video time and a smaller aspect ratio.</p> |
