Apparatus and methods, such as with
processing apparatus (102), distinguish
sleep disordered breathing (SDB) events from a
signal generated by, for example, a photoplethysmography (PPG) sensor. Data representing the
signal from the sensor may be received and a PPG-based
respiratory signal may be derived from data. First and / or second level features may be computed from the
respiratory signal. The first and / or second level features may be evaluated, such as in a classifier. Based on the evaluation, an output indication identifying SDB type may be generated. In some implementations, the apparatus, detects SDB event(s) from a PPG
signal. Data representing the signal from the PPG sensor may be received. A
vasoconstriction event and / or arrhythmia event may be detected from the data. The data representing the PPG signal may be evaluated to generate, based on the evaluation and the detected events of
vasoconstriction and / or arrhythmias, an output indication identifying SDB event(s).