p3_12.m

来自「数字信号处理源代码～～～课后试验的代码·」· M 代码 · 共 7 行

% Program P3_12
% Parseval's Relation
x = [(1:128) (128:-1:1)];
XF = fft(x);
a = sum(x.*x)
b = round(sum(abs(XF).^2)/256)