Alan M. Figgatt,Daniel J. Mulholland,Warren Holford
申请号：
US14711931
公开号：
US09364184B2
申请日:
2015.05.14
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A math model envelope of a single heartbeat between primary and secondary peaks of an autocorrelation of a received cardiovascular sound signal comprises an S1 lobe and a like-polarity S2 lobe. A bootstrap filter envelope is generated by averaging data from a plurality of heart cycles within heart cycle boundaries located responsive to a convolution of the envelope with the cardiovascular sound signal. Start points of a plurality of heart cycle signals are located from a convolution of the bootstrap filter envelope with the cardiovascular sound signal. The S1 and S2 regions are located within a cardiovascular sound signal responsive to peak and valley locations thereof and responsive to a phase window signal generated by filtering an average of a plurality of heart cycle signals, wherein the peak and valley locations are located responsive to a second derivative of the phase window signal and responsive to the start points.
