| 摘要 |
PURPOSE:To prevent the pattern from shifting to the center and producing lack of a part, by integrating signals from horizontal and vertical positioners and faders, generating a phase control signal of wipe pattern, supplying it to a fundamental wave generator for waveforming. CONSTITUTION:Horizontal, vertical position control variable resistors 3, 4 operate like a positioner which controls the center position of wipe pattern, a signal from horizontal, vertical faders 8, 9 is integrated at multipliers 11, 12, and supplied to a phase shifter 5 as a position control signal. As a result, the phase of horizontal, vertical synchronizing signal from terminals 1, 2 is controlled and applied to a fundamental wave generator 6 to determine the phase. A wipe pattern signal sliced with a signal from the faders 8, 9 in a waveform rectifier 7 is obtained at a terminal 10. Thus, as the area of the wipe pattern increases, it moves to the center of the screen, allowing to avoid the production of shift-overlapped picture and partial lacking and to perform smooth changeover of the screen. |
