#$%^&*AU2015202922A120150618.pdf#####ABSTRACT The present disclosure relates to systems and methods for detecting features of a signal. According to embodiments, by transposing segments of a signal, such as segments representing pulses in a PPG signal, such that they are stacked next to each other, various characteristics about the signal may be discerned such as information about repetitive features of the signal. According to an embodiment, from a PPG signal respiration information may be determined about individual breaths, blood pressure changes may be determined, and information about other physiological parameters affecting the PPG signal may be determined. Fig 8w 0 I,10 12 415 PC3Y1B2O(09/,0O61 S8 O AGNOSE SP 8AY FORMSACKO STEP $12 HGIV. cB