Recent Posts

Fourier Analysis

I hate it when people make simple things complicated, and complicated things impossible.

Wavelet Transform

There are already many nice introduction of wavelet transform, like here and the following video. This is my simple note on WT while reading those tutorials.

Cross-Wavelet Transform

Before we talk about cross-wavelet transform (CWT)1, we need to understand wavelet transform (WT). Before we learn wavelet transform, we’d better have a good...

Ubuntu Soundtrack

I’ve been using Ubuntu 18 for quite some time now. One thing that is frequently not working properly is the sound output switches. It happens from time to ti...