| 摘要 |
PURPOSE:To enable to rotate an arbitrary part in a displayed test piece image for an arbitrary magnification and angle, by adding a rotating scanning signal generating circuit output via an auxiliary magnification control circuit with a rotating center circuit output, and transmitting the result to a scanning deflection means. CONSTITUTION:Angle signals of sin theta, cos theta from an angle signal generating circuit 11 are applied to the 1st coordination conversion circuit 12X, 12Y, a horizontal scanning signal H from a horizontal scanning circuit 8X and a vertical scanning signal V from a vertical scanning circuit 8Y are converted to produce signals as formulasI, II and supplied to auxiliary magnification control circuits 13S, 13Y. Center position set circuits 14X, 14Y produce DC signals X, Y and supply them to the 2nd coordinate conversion circuits 15X, 15Y. The signals of sin theta, cos theta are applied from an angular signal generating circuit 11 to the conversion circuits 15X, 15Y to produce a conversion signal like formula III and supply to addition circuits 17X, 17Y. A marker signal generating circuit outputs high luminance signal to a CRT7 only When a horizontal scanning signal H almost coincides with the signal X and a vertical scanning signal V almost coincides with the signal Y. |
