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MAS_testing.m

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+clear all
+close all
+clc
+
+
+signals = loadAllSignals('Supelec_2012_SIR_Spectral_Analysis_EA_v001.mat');
+Fe = 1000000.0;
+signal = signals(:,1);
+t = (0: 1: length(signal)-1)/Fe;
+
+%filtering smooth
+nb_coeff = 10;
+coeff = ones(1, nb_coeff)/nb_coeff;
+signalm = filter(coeff, 1, signal);
+
+%envelope time
+signalenv = filter(coeff, 1, abs(hilbert(sgolayfilt(signal, 1, 3))));
+plot_param = {'Color', [0.6 0.1 0.2],'Linewidth',1}; 
+
+% savitzky-golay
+signalsg = sgolayfilt(signal, 1, 3);
+
+%fft
+t0pad=2^12;%0-padding
+f=((1: t0pad)-1)*Fe/t0pad-Fe/2;%echelle des frequences centrée en 0
+TFx0pad=filter(coeff, 1, fft(signal, t0pad));%fft avec 0-padding
+ModulTFx0pad=abs(TFx0pad);%module
+CenterModulTFx0pad=fftshift(ModulTFx0pad);%shift zero-frequency component to centrer of spectrum
+signalF=20*log10(CenterModulTFx0pad);%log
+%fft smooth
+TFx0pad=filter(coeff, 1, fft(signalm, t0pad));%fft avec 0-padding
+ModulTFx0pad=abs(TFx0pad);%module
+CenterModulTFx0pad=fftshift(ModulTFx0pad);%shift zero-frequency component to centrer of spectrum
+signalmF=20*log10(CenterModulTFx0pad);%log
+%fft hilbert
+TFx0pad=filter(coeff, 1, fft(signalenv, t0pad));%fft avec 0-padding
+ModulTFx0pad=abs(TFx0pad);%module
+CenterModulTFx0pad=fftshift(ModulTFx0pad);%shift zero-frequency component to centrer of spectrum
+signalenvF=20*log10(CenterModulTFx0pad);%log
+%savitzky-golay
+TFx0pad=filter(coeff, 1, fft(signalsg, t0pad));%fft avec 0-padding
+ModulTFx0pad=abs(TFx0pad);%module
+CenterModulTFx0pad=fftshift(ModulTFx0pad);%shift zero-frequency component to centrer of spectrum
+signalsgF=20*log10(CenterModulTFx0pad);%log
+
+%plot
+figure
+subplot(221)%%%%%%%%%%%%%%%%%%%%%%%
+plot(t, signal)
+xlabel('Time (s)')
+ylabel('Amplitude (a.u.)')
+hold on
+plot(t, signalm)
+xlim([0 length(signal)/Fe])
+title('smooth filtering')
+legend('signal', 'avg signal')
+subplot(223)%%%%%%%%%%%%%%%%%%%%%%
+plot(t, signal)
+xlabel('Time (s)')
+ylabel('Amplitude (a.u.)')
+hold on
+plot(t,[-1,1].*signalenv,plot_param{:})
+plot(t, signalsg)
+xlim([0 length(signal)/Fe])
+title('Hilbert Envelope')
+legend('signal', 'Hilbert Envelope', 'savitzky-golay')
+subplot(222)%%%%%%%%%%%%%%%%%%%%%%
+plot(f, signalF)
+xlabel('f(Hz)');
+ylabel('Module de la TF en dB');
+grid on
+hold on
+plot(f, signalmF)
+legend('signal', 'avg signal')
+title('FFT')
+xlim([0 Fe/2])
+subplot(224)%%%%%%%%%%%%%%%%%%%%%%
+plot(f, signalF)
+xlabel('f(Hz)');
+ylabel('Module de la TF en dB');
+grid on
+hold on
+plot(f, signalenvF)
+plot(f, signalsgF)
+legend('signal', 'signal Hilbert', 'savitzky-golay')
+title('FFT')
+xlim([0 Fe/2])
+
+figure
+ax1 = subplot(3,1,1);
+plot(t,signal)
+ax2 = subplot(3,1,2);
+pspectrum(signal,Fe,'spectrogram','OverlapPercent',99, 'Leakage',1,'MinThreshold',-150)
+colorbar(ax2,'off')
+ax3 = subplot(3,1,3);
+pspectrum(signal,Fe,'spectrogram','OverlapPercent',99, 'Leakage',1,'MinThreshold',-150,'TimeResolution', 10e-6)
+colorbar(ax3,'off')
+linkaxes([ax1,ax2,ax3],'x')
+
+figure
+[sp,fp,tp] = pspectrum(signal,Fe,'spectrogram','OverlapPercent',99, 'Leakage',1);
+mesh(tp,fp,sp)
+view(-15,60)
+xlabel('Time (s)')
+ylabel('Frequency (Hz)')