| 摘要 |
A servo loop arrangement for the reproduction of data from a record medium has interleaved pulse trains of opposite polarity pulses applied to it to add to the servo loop control signal which undesirably includes an offset voltage. The resultant increasing opposite polarity changes in the control signal in successive pulse train intervals are threshold detected. The numbers of opposite polarity pulses required to reach the threshold values are compared and any difference in number is converted to a compensation signal which is added to the servo loop to compensate for the offset voltage.
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