The center of mass of the spectrum.

x(n) is the magnitude of bin number, f(n) is the center frequency of that bin. The following MATLAB function is from the exchange website;

function C = SpectralCentroid(signal,windowLength, step, fs)

signal = signal / max(abs(signal));

curPos = 1;

L = length(signal);

numOfFrames = floor((L-windowLength)/step) + 1;

H = hamming(windowLength);

m = ((fs/(2*windowLength))*[1:windowLength])';

C = zeros(numOfFrames,1);

for (i=1:numOfFrames)

window = H.*(signal(curPos:curPos+windowLength-1));

FFT = (abs(fft(window,2*windowLength)));

FFT = FFT(1:windowLength);

FFT = FFT / max(FFT);

C(i) = sum(m.*FFT)/sum(FFT);

if (sum(window.^2)<0.010)

C(i) = 0.0;

end

curPos = curPos + step;

end

C = C / (fs/2);

how to run this code??? please prove the steps.

ReplyDeleteplease explain this code, especially m

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