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0.4 Hz frequency accurate time-frequency representation Afonso analyzed apnea monitoring average heart rate average power band of frequencies biomedical signals breathing pattern modulates change in heart components of 0.25 computed the time-frequency DataDwd experimental protocol followed by 30 Fourier transform-based spectrogram freq2 freql frequency domain frequency resolution glottis heart rate increases heart rate modulation heart rate signal heart rate variation Hz Parameter Total IEEE Trans indicate normal breathing instantaneous heart rate instructed the subject intercostal space lung volume MATLAB Nfreq no-breathing nonstationary Ntime ones(l,Nfreq Parameter Total Avg parameters computed parameters extracted percentage change protocol MNB protocol N rate per second respiratory sinus arrhythmia S_zx sampling segment shows the time-frequency single sinusoidal component sl2 Band smoothing windows spectral density StepSize Street Madison Subject ma2 Band thesis time-frequency distribution transition from protocol University of Wisconsin Valtino ventilatory monitoring Wigner-Ville Distribution window function