property5.m

来自「用dsp解压mp3程序的算法」· M 代码 · 共 9 行

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% property5 - Program for showing Parseval relation
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

x = [1 2 3 4 4 3 2 1];
energy_time = sum(abs(x).^2)

X = fft(x,8);
energy_freq = (1/8)*sum(abs(X).^2)