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"added SNR estimaton method described by Gorga 1984" #10

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13 changes: 11 additions & 2 deletions matlab/sp_simulation.m
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Original file line number Diff line number Diff line change
Expand Up @@ -97,14 +97,23 @@
[maxX,indMax]=max(X);
RMS_X=20*log10(sqrt(mean(x.^2)));

%Estimate noise floor according to Gorga 1983
[~,ind]=min(abs(F3-freq));
%Gorga used 3 bins up and 3 bins below response to estimate noise floor
%his bin width was close to 50 Hz
[~,LB]=min(abs((F3-150)-freq));
[~,UB]=min(abs((F3+150)-freq));
respEst=X(ind);
noiseEst=mean([mean(X(LB:ind-1)) mean(X(ind+1:UB))]);

%Plot everything
plot(freq,X,clr(nwin)); hold on
grid on
title(['Fmax= ' num2str(maxX) ' dB, Amp= ' num2str(A) ' dB, x RMS (dB) = ' num2str(RMS_X) ' , Fmax= ' num2str(freq(indMax))])
title(['Fmax= ' num2str(maxX) ' dB, F1= ' num2str(F1) ' dB, RMS X = ' num2str(RMS_X) ' ,Amp= ' num2str(A)])
xlabel('Frequency (Hz)')
ylabel('Power/Frequency (dB/Hz)')
xlim([0 4000])

WIN{nwin}=[ WIN{nwin} ' SNR:' num2str(num2str(respEst-noiseEst))];
end
legend(WIN(:))