为什么选择DCT而不是DFT

 信号笔记：DCT与DFT的比较 - 知乎 (zhihu.com)

https://www.quora.com/Why-DCT-has-less-high-frequency-coefficient-than-DFT-I-have-been-reading-about-that-DCT-has-even-symmetry-and-DFT-does-not-but-I-dont-get-it

fft - Why would you use DCT as oppose to DFT for detecting oscillation in a signal? - Signal Processing Stack Exchange 

dct - What is the difference between a Fourier transform and a cosine transform? - Signal Processing Stack Exchange

对于时序预测，

 http://rmarsh.cs.und.edu/CLASS/CS446/DiscreteCosineTransform.pdf

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 详解离散余弦变换（DCT） - 知乎

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