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BACKGROUND AND PURPOSE:Upper cervical spinal canal dimension may have a role in abnormal CSF dynamics in patients with Chiari I malformation. We attempted to measure spinal canal tapering from anteroposterior spinal canal dimensions in patients with Chiari I.

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A passive filter has the following drawbacks.It hardly compensates harmonics which frequencies * It causes a parallel resonance, a series resonance, or These drawbacks of the passive filter can be alleviated by the combined use of the active and passive filters and by appropriately coordinating their operations. That is, of the harmonics generated by the cycloconverter, the varying frequency components are absorbed by the active filter' and the fixed frequency components by the passive filters. This provides a good harmonic compensation over the entire operation range for the irregularly varying frequency harmonic current generated by the cycloconverter. In addition, this arrangement suppresses parallel and series resonances.The authors prepared a digital simulation program consisting of a passive filter, active filter, cycloconverter and power supply system and studied a variety o f combinations of passive and active filters in terms of harmonic compensation, parallel resonance suppression, and series resonance suppression. This paper describes the passive and active filter combination techniques and t h e characteristics of each combination. are constantly changing. both which distorts voltages.

Results ofthe training test showed that all quenches observed reached 8