| 摘要 |
<p>PURPOSE:To display plural images at free vertical positions in one screen by providing an input means which changes the set value of a coincidence detecting time number and generates a coincidence detection signal corresponding to a display image switching signal when a horizontal synchronizing signal count value is coincident with the set value. CONSTITUTION:A horizontal synchronizing signal counter 12 counts horizontal synchronizing signals in output digital image signals from an A/D converter 4 and supplies the output to a coincidence detection circuit 14. The coincidence detection circuit 14 compares the set value applied by a CPU 16 beforehand with the output value of the counter 12 and when both are coincident, the coincidence detection signal, namely, a horizontal interruption signal is outputted to the CPU 16. The set value applied from the CPU 16 to the coincidence detection circuit 14 can be changed through a key interface circuit 20 by a cursor key 18. When the horizontal interruption signal or the like is received, the CPU 16 controls an image synthesizing/switching circuit 13 by executing a horizontal interruption processing or the like according to a prescribed program.</p> |
