补零是一种有效的技术，可以改善 FFT结果的可视化效果，并可能加快计算速度。然而，重要的是要理解，它不会提高原始信号的基频分辨率，如果使用不当，可能会引入伪影。快速傅里叶变换 (FFT)中为什么要补零？

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