| 摘要 |
Vertical-rate and horizontal-rate sawtooth generators are coupled at a common input to a conventional focus control voltage and then to the centering circuits of an image tube via respective potentiometers. The amplitudes and polarities of the generator outputs are selected such that when driven simultaneously by the electrical focus control voltage supplied to an image tube, generates an image rotation which just cancels any image rotational error inherently induced by an electrical focus adjustment.
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