Store spectrogram with image data format in the MATLAB workspace

Hi.

I want to analyze spectrograms of multiple audio files in a folder.

Audio files share the word "SPTGRM" in their names.

Audio files are stereo-type and I will take one channel data.

I saved data in the "AudioData" and also saved spectrogram data of these audio files.

I want to store spectrogram image in the cell with image data format (like [512 512 3]).

However, spectrograms are saved in "complex double" matrix like the figure below.

How can I get image data format?

Address = 'C:\Users\KOH\Desktop\MATLABcode\Soundsample';
Directory = dir(fullfile(Address,'SPTGRM*.wav'));
windowSize = 256;
windowOverlap = [];
freqRange = 1000:20000;
for i = 1:numel(Directory)
    F = fullfile(Address,Directory(i).name);
    [y,Fs] = audioread(F);
    endtime = numel(y)/(2*Fs);
    t = 1/Fs:1/Fs:endtime;
    AudioData{i}=y(:,1);
    Spectrogram{i}=spectrogram(AudioData{i}, windowSize, windowOverlap, freqRange, Fs, 'yaxis');
end

Answer 1

[Star Strider]

I would use the saveas function on the created figure to save it to whatever format is desired (and supported).

Answer 2

[yanqi liu]

Address = 'C:\Users\KOH\Desktop\MATLABcode\Soundsample';
Directory = dir(fullfile(Address,'SPTGRM*.wav'));
windowSize = 256;
windowOverlap = [];
freqRange = 1000:20000;
for i = 1:numel(Directory)
    F = fullfile(Address,Directory(i).name);
    [y,Fs] = audioread(F);
    endtime = numel(y)/(2*Fs);
    t = 1/Fs:1/Fs:endtime;
    AudioData{i}=y(:,1);
    data=spectrogram(AudioData{i}, windowSize, windowOverlap, freqRange, Fs, 'yaxis');
    Spectrogram{i} = im2uint8(mat2gray(abs(data)));
end