| 摘要 |
<p>A television signal processing circuit includes a display device having a screen with an aspect ratio of m1:n1 (m1 < n1), a circuit for displaying a main-picture originated from a first television signal on the display device, a processor for superimposing a sub-picture originated from a second television signal with a reduced size smaller than the maim-picture on a part of the main-picture by thinning out the scanning lines of the second television signals, a selector for selecting the display mode of the main-picture between a normal display mode associated with a first number of scanning lines and a zoom display mode associated with a second number of scanning lines less than the first number of scanning lines as well as an expanded vertical amplitude, and a thinning-out processor responsive to the selecting means for thinning out the scanning lines of the sub-picture, either to display the sub-picture at an aspect-ratio of m2:n2 (m2 < n2) by thinning out the scanning lines of the sub-picture to 1/a1 when the main-picture is associated with the normal display mode or to display the sub-picture with an aspect-ratio closed to the aspect-ratio of m2:n2 by thinning out the scanning lines to 1/a2 (a1 < a2) when the main-picture is associated with the zoom display mode. <IMAGE></p> |
