Patent ID: 8897862
Filing Date: 2014-11-25
Classification: A61B

Abstract:
1. A non-transitory computer-readable recording medium storing a computer program for extracting a fetal cardiac potential signal, the computer program comprising: a selecting module configured to select, from among a plurality of biopotential signals, a biopotential signal containing a high proportion of a maternal cardiac potential signal component; an independent component analysis module configured to perform independent component analysis on the plurality of biopotential signals; a periodic signal detection module configured to detect, as a first peak time signal, a signal having periodic peaks from a biopotential signal selected by the selecting module and to detect, as second peak time signals, one or more signals having periodic peaks among signals output from the independent component analysis module wherein the periodic signal detection module includes: a module configured to acquire an energy signal of the selected biopotential signal; a module configured to acquire a moving average signal of the energy signal based on a predetermined window width; and a module configured to detect a peak from a signal in a region having a greater value than the moving average signal in the energy signal; an output signal selecting module configured to acquire the first peak time signal as reference input and also acquire the one or more second peak time signals as comparison input, so as to select from among the one or more second peak time signals a signal having peak times different from those of the first peak time signal; and a module configured to output a signal selected by the output signal selecting module, wherein the periodic signal detection module judges, when the variance of intervals between detected peaks is a predetermined reference variance value or less, an output signal having such peak intervals to be a periodic peak time signal.