| 摘要 |
<p>A first circuit (30), for example a multiplier, combines a first horizontal rate waveform of a generally sinusoidal waveshape (B) with a vertical rate waveform (C) to define a correction signal (H SINE X V PARAB). A generator for a dynamic magnetic field in a cathode ray tube, for example an auxiliary deflection coil (63), is responsive to the correction signal for correcting an inner pincushion distortion. The vertical rate waveform has a generally parabolic waveshape and a zero value during vertical retrace. A second circuit, for example a summer (61), combines a second horizontal rate waveform of the generally sinusoidal waveshape and the correction signal to define a composite correction signal which also corrects a horizontal linearity distortion. The first and second horizontal rate waveforms are generated by the same waveform generator, which further corrects any distortion due to asymmetry of the horizontal rate waveforms as generated. <IMAGE></p> |
