| 摘要 |
PURPOSE:To perform excellent convergence correction, by rearranging a correction data at a representative point stored in a memory at the time of switching a deflection frequency, at the same position on a picture plane, and keeping the amplitude of an interpolation factor signal in constant invariably regardless the deflection frequency. CONSTITUTION:The correction data at a certain representative point is inputted from a memory 3 in which a correcting quantity at the representative point is stored, to the binary input of an MDAC(multiplition type DA conversion)5, and the correction data at the representative point of low-order stage by one, are inputted simultaneously to the binary input of a MDAC6. Memory addresses to read out those correction data are supplied by a horizontal address counter 1, and a vertical address counter 2. A binary output from the vertical address counter 2 is added on an interpolation factor circuit 4, and from the interpolation factor circuit 4, interpolation factors K, and 1-K are outputted, and they are added on the MDACs 5 and 6, respectively. The outputs of the MDACs 5 and 6, after being synthesized at an adder 7, are outputted as correction waveforms through an LPF8.
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