2013年12月31日 · First of all, DFT produces complex valued outputs, therefore, you better compare its magnitude with magnitude of DCT whose input and output are both real. As you …

Here DCT can be selected as the second transform, because for real-valued input, the real part of the DFT is a kind of DCT. The reason why DCT is preferred is that the output is approximately …

2019年7月17日 · A DCT is identical to a DFT, twice as long, of the input data concatenated with its mirror image. Data concatenated with its mirror results in symmetric data. Since a …

2020年9月11日 · Each plot shows the magnitude of DFT in decibel scale for multiple different fractional offsets of the sinusoid frequency from a DCT bin frequency, in units of bin width. …

Now your data is twice as long, and you perform an FFT on twice the length. but you have some symmetry to it that allows you to toss half of the data in the result of the DFT. exactly how, …

2021年5月22日 · I need to model the relationship between the DCT and DFT transforms (If it exists).

2023年1月17日 · I need to compute the DCT of a signal (in fact its a image). As I already have the DFT of that signal, I wonder if there is any cheap way to obtain the DCT in terms of the DFT. …

2015年11月16日 · In particular, a DCT is a Fourier-related transform similar to the discrete Fourier transform (DFT), but using only real numbers. DCTs are equivalent to DFTs of roughly twice …

Fast DCT from DFT. 1. Which DCT implementation is the correct one. 1. Real DFT Using DCT. 1. How can ...

2016年6月19日 · As you described correctly, DCT is closely related to DFT. The two main motivations behind DCT are it's being a real transform and its compaction of signal energy. …