MATLAB: If I have a periodic function piecewise, I could calculate THD Total Harmonic Distortion for it

code generationsignal processingthd fft

I have a periodic signal, but is built in piecewise, how could I calculate THD for this function?

Best Answer

The Signal Processing Toolbox has a function that will do that for you, thd()

thd() is new in R2013b.

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MATLAB: How to use spectrum analyzer object to show a signal waveform

You can set FrequencyResolutionMethod to 'Window length' to manually adjust the length of signal used to compute the spectrum, e.g.,

Fs = 2500; 
Sineobject1 = dsp.SineWave('SamplesPerFrame',1024,'SampleRate',Fs,'Frequency',100); 
Sineobject2 = dsp.SineWave('SamplesPerFrame',1024,'SampleRate',Fs,'Frequency',1000); 
SA = dsp.SpectrumAnalyzer('SampleRate',Fs,'NumInputPorts',2,'PlotAsTwoSidedSpectrum',... 
    false,'ChannelNames',{'SinewaveInput','NotchOutput'},'ShowLegend',true,...
    'FrequencyResolutionMethod','WindowLength');
step(SA,step(Sineobject1),step(Sineobject2))

MATLAB: Simulink

You probably have even more signal processing needs than just this, so I suggest using the DSP System Toolbox. There is an FFT block, that would help you and much more.

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MATLAB: How to use spectrum analyzer object to show a signal waveform

MATLAB: Simulink

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