exmp2_2.m

用dsp解压mp3程序的算法

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% exmp2_2.m - Estimate power of signal saved in data file
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

load sn.dat -ASCII;    % load saved sinewave samples 
                       % generated in Example 2.1
N = length(sn);        % length of vector sn
Px = sum(abs(sn).^2)/N % estimate power of sequence sn