The more general uncertainty principle, regarding Fourier transforms

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两个频率很近的音调，在短暂观察期间可能都与信号很吻合。缩短脉冲有助于定位发生时间，却扩大与它相关的频率范围。

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So an observation over a short period of time gave you low confidence over what their frequencies are.

The shorter it lasts in time, the less certain you can be about what its exact frequency is.