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A method of turntable speed control.still under development, is described which is intended to minimise the slow frequency variation ("wow") caused by disc eccentricity.No special transducers are required since the pickup output has a component due to the "wow".This can therefore be used as the error signal in a control loop desimed to vary the angular velocity of the platter in order to keep the tangential velocity at the stylus relatively constant.
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J.H. Atherton (2024) studied this question.
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