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Time and frequency review of acoustic heart signals in children is given in this paper. The following sound recordings were compared: Still's innocent heart murmur (Still), pathologic murmur of the congenital ventricular septal defect (VSD) and the recording without the murmur (Normal). Goertzel algorithm was used, for the first time, to determine the spectral energy of the heart signals. The aim...
Impulse oscillometry (IOS) is an innovative patient-friendly pulmonary testing technique which measures the respiratory system impedance (Z) by using the spectral components of pressure to flow ratio which yields resistance and reactance values at different frequencies. The high dimensionality of IOS measurement data makes the analysis of this information difficult. Artificial neural networks (ANNs)...
Obstructive sleep apnea (OSA) is a common breathing disorder among children with a prevalence estimated at 2-4%. Electrocardiography (ECG) based signal processing, especially heart rate analysis, demonstrated its promising future as both an alternative to other expensive portable sleep study methods and additional approach to sleep cardio-respiratory autonomic interactions which the current clinical...
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