This double frequency distortion can be used to double frequency of incident signal.

这种倍频失真可用于对入射信号进行倍频。

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Objective: To observe the effect of double frequency YAG laser in treating pterygium.

目的：观察倍频y AG激光治疗早期翼状胬肉的临床效果。

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The fraction frequency and double frequency scattering peaks exhibit similar scattering behaviour as the resonance scattering.

分频散射和倍频散射峰与共振散射峰具有相似的散射行为。

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The Swiss Federal Railways has improved efficiency in recent years too, by using double-decker trains and increasing its trip frequency.

BBC: Are the Swiss really that efficient?

The SS-AR2's incorporated drivers support a maximum input power of 100 watts through a 25 mm (one inch) soft dome, a 130 mm (five inch) sliced-paper cone and a 165 mm (six and a half inches) aluminum cone (double-drive system), producing a frequency response from 42 Hz to 60kHz.

ENGADGET: Sony reveals SS-AR2 loudspeaker, wants an invite to your next house party