Extraction of fetal cardiac signals

摘要

A method for processing cardiac signals includes accepting, from a sensor system, a set of one or more signals, the signals including components of a desired cardiac signal and components of a substantially periodic interfering signal. The method is applicable for extraction of desired fetal cardiac signals from signals with interference from the maternal cardiac signal. A periodicity of the interfering signal is determined, and one or more iterations of mitigating an effect of a component of the signals that exhibit periodicity at the determined periodicity of the interfering signal are performed. In some examples, the method further includes determining a periodicity of the desired cardiac signal, and performing one or more iterations of enhancing an effect of a component of the signals that exhibit periodicity at the determined periodicity of the desired cardiac signal.

主权项

1. A method for processing an input signal that includes a pseudo-periodic signal present with another signal, the method comprising:
accepting the input signal, the input signal being representable as a vector signal in a multidimensional vector space; forming a phase signal representing a time-varying periodicity of the pseudo-periodic signal; identifying a subspace of the vector space that exhibits correlation at the time-varying periodicity; forming a component of the input signal according to the identified subspace; and processing the input signal to either enhance or to mitigate an effect of the formed component to produce a processed signal.