Smoothing algorithm is exploited to remove the errors of multiple frequency point, half frequency point and random point, and realize pitch curve smoothing.

使用平滑算法消除倍频点、半频点和随机点产生的误差，实现基音曲线平滑。

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The analysis results also indicate rub-impact faults induced by oil-film instability can produce some low-frequency components with small amplitude and oil whip can produce half frequency component;

油膜失稳引起的转定子碰摩故障，会产生一些低频成分，油膜振荡会产生半频成分；

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It is posed that angular air-hammer self-excited vibration and half frequency wobble self-excited vibration are two reasons for resulting angular wobble self-excited vibration for gas film face seals.

提出造成气膜端面密封角向摆动自振的内在机理，既有半频摆动自振又有角向气锤自振。

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Gatwick Express services reduced to a half-hourly frequency.

BBC: Easter travel information

High-frequency trading now makes up half of the volume, while an explosion of order types does little more than guarantee confusion for ordinary investors, increasing stress.

FORBES: Q: Why Did the Investor Cross the Road?

Bankrolled by its toy sales, it has moved into cordless telephones, and now has half the market in America for high-frequency models, under its own label and for Lucent and Sony.

ECONOMIST: Electronic toys