| 摘要 |
A quantizing error removing circuit for a rotational control device applied to a servo circuit and the like of a video cassette recorder, designed to removing the quantizing error generated upon controlling the speed and phase, minimizing a change of gain characteristic of a control device, thereby improving its efficiency. The circuit according to the present invention includes a moving average filter which comprises a predetermined number of delay elements connected in series to each other in order to delay by a predetermined set time, a phase error control signal outputted from a phase control filter; a summer for summing the phase error control signal and each output of the delay elements; a divider for dividing a summed output value of the summer by the number of summing signals, thereby outputting the divided quotient as a phase control signal; and another delay element for delaying the remainder value outputted from the divider by a predetermined set time, thereby feeding the remainder value back to the summer. The remainder value fed back from said other delay element to the summer is summed with the summed value of the summer at the next sampling time point, and according to this, generation of quantizing error caused by the presence of the remainder value is prevented.
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