?? q_psfd_cal.m
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function d=q_psfd_cal(data,psf,fs)
% command object: calculate power spectral density of frequency specified by psf
% command format: d=q_psfd_cal(data,psf,fs)
% command parameters: data, one array of time data
% psf, focused frequecy
% fs, sample frequency
% other descriptions:
[tf,f,t]=spectrogram(data,kaiser(fs,2),fs-1,fs,fs);
temp=abs(tf);
d=mean(temp(psf+1,:),1);
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