www.gusucode.com > signal 案例源码程序 matlab代码 > signal/HarmonicPowersAndCorrespondingFrequenciesExample.m
%% Harmonic Powers and Corresponding Frequencies % Create a signal sampled at 10 kHz. The signal consists of a 100 Hz % fundamental with amplitude 2 and three odd-numbered harmonics at 300, % 500, and 700 Hz with amplitudes 0.01, 0.005, and 0.0025. Specify the % number of harmonics to 7. Determine the THD, the power at the harmonics, % and the corresponding frequencies. % Copyright 2015 The MathWorks, Inc. fs = 10000; t = 0:1/fs:1-1/fs; x = 2*cos(2*pi*100*t)+0.01*cos(2*pi*300*t)+ ... 0.005*cos(2*pi*500*t)+0.0025*sin(2*pi*700*t); [r,harmpow,harmfreq] = thd(x,10000,7); [harmfreq harmpow] %% % The powers at the even-numbered harmonics are on the order of $-300$ dB, % which corresponds to an amplitude of $10^{-15}$.