http://traditioe225fc22n4xhtlabsvo6wuddvunbffssketkq2pmygdnhwqd.onion/%D0%A1%D0%BF%D1%80%D0%B0%D0%B2%D0%BA%D0%B0:%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D1%8B
X k = 1 N ∑ n = 0 N − 1 x n e i 2 π k n N \definecolor{energy}{RGB}{114,0,172}
\definecolor{freq}{RGB}{45,177,93}
\definecolor{spin}{RGB}{251,0,29}
\definecolor{signal}{RGB}{18,110,213}
\definecolor{circle}{RGB}{217,86,16}
\definecolor{average}{RGB}{203,23,206}
\color{energy} X_{\color{freq} k} \color{black} =
\color{average} \frac{1}{N} \sum_{n=0}^{N-1}
\color{signal}x_n \color{spin}
e^{\mathrm{i} \color{circle} 2\pi \color{freq}k
\color{average} \frac{n}{N}} Чтобы получить энергию на определённой частоте...