# 任意模数的FFT

shinbokuow posted @ Jan 05, 2016 03:54:59 PM in Something with tags FFT 中国剩余定理 NTT , 3748 阅读

Alyssa 说:
Jan 10, 2023 07:42:19 PM

"The discrete Fourier transform (DFT) of a sequence is defined as a sequence of Phasors. Given a sequence $x[n]$, its DFT is given by: $$X[k] = \sum_{n=0}^{N-1} x[n] \; e^{-i 2 \pi \frac{kn}{N}} \;\;\;\; k=0,1,2,...,N-1$$ where $N$ is the length of the sequence. If we <a href="http://charnastewart.com/properties/sold/">real estate companies Cohutta</a> let $N$ be a power of 2, i.e. $N=2^m$, then the DFT can be computed using the Fast Fourier Transform"

milan 说:
Jan 10, 2023 07:43:07 PM

"The discrete Fourier transform (DFT) of a sequence is defined as real estate companies Cohutta a sequence of Phasors. Given a sequence $x[n]$, its DFT is given by: $$X[k] = \sum_{n=0}^{N-1} x[n] \; e^{-i 2 \pi \frac{kn}{N}} \;\;\;\; k=0,1,2,...,N-1$$ where $N$ is the length of the sequence. If we let $N$ be a power of 2, i.e. $N=2^m$, then the DFT can be computed using the Fast Fourier Transform"

Emma 说:
Jan 12, 2023 01:37:35 PM

The Fast Fourier Transform (FFT) is a more efficient way to calculate the Discrete Fourier Transform (DFT). The FFT can be used on any modulus, but it is most efficient when the <a href="http://berkshirecountyma4sale.com">real estate services Great Barrington</a> number of data points is a power of 2. The FFT is a divide and conquer algorithm that breaks down a dataset into smaller pieces, then recombines them to form the final result. The FFT is faster than the DFT because it takes advantage of the symmetry of the data.

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