| 摘要 |
PURPOSE:To attain the variation of a set-up level and at the same time to prevent the generation of ringing by varying a blanking level and also producing the interpolation data of two samples when the blanking gating is carried out. CONSTITUTION:A blanking potential control signal 1, a PCM video signal 2, a quantized sampling pulse 3 of the signal 2 and a blanking pulse 4 showing a blanking position are supplied to input terminals 101-104, respectively. The signal 1 is applied to a selector circuit 111 as a PCM blanking level 8 via an A/D converter 105 and a latch circuit 106. The signal 2 is converted into interpolation levels 17 and 18 via a latch circuit 117 and arithmetic circuits 109, 110 and 119. The signal 2 is also shifted by a latch circuit 118 and converted to a PCM video signal 19 to be applied to the circuit 111. The circuit 111 outputs the level 17 or 18 of the signal 19 or 2 according to the output address of a counter circuit 116. |
