How do I extract data from the phase response in the DSP Systems Toolbox?

Within MATLAB's Digital Signal Processing Toolbox, I've been able to extract spectrum data and store it as a variable using the "getSpectrumData" function. I'm trying to extract the data (values of the x and y-axis) of the phase response displayed by the Dynamic Filter Visualizer. I've provided the figure generated by the DFV for reference. Thank you.

Answer 1

[Pratyush]

Hi G,

I understand that you want to extract the values of x-axis and y-axis displayed by the spectrumAnalyzer.

The "getSpectrumData" function gives you a spectrumTable object. The "FrequencyVector" field of this spectrumTable object has the x-axis data and the "Spectrum" field has the corresponding y-axis data. The following code example shows how to access the data from Dynamic filter visualizer:

% get the spectrum data
specTable = getSpectrumData(scope)

% get the phase response
phaseResponse = specTable.Spectrum{1,1};

% get the corresponding frequency
frequency = specTable.FrequencyVector{1,1};

Hope this helps!

[G]

Hi Pratyush,

I've already been able to do this to get the spectrum and frequency vectors from a spectrum. I am trying to obtain the phase response (bottom graph in post above) of the DynamicFilterVisualizer ("dsp.DynamicFilterVisualizer" function). I apologize for the confusion. Thank you.