https://blog.425763.xyz/zh-cn/tags/psd/ Recent content in Psd on Digital garden Hugo zh-cn Tue, 23 Dec 2025 17:52:38 -0500 https://blog.425763.xyz/zh-cn/post/power-density-spectrum-psd/ Sun, 18 Aug 2024 10:00:08 +0800 https://blog.425763.xyz/zh-cn/post/power-density-spectrum-psd/ 在看文章Analytical Resolution and Noise Characteristics of Linearly Reconstructed Magnetic Resonance Data with Arbitrary k-Space Sampling的时候，我不是很明白方程27，为什么低通滤波之后噪声的方差改变了。原来