Method for arbitrary two-dimensional scaling of phonocardiographic signals
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United States of America Patent
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Oct 21, 2008
Grant Date -
Jul 13, 2006
app pub date -
Oct 9, 2003
filing date -
Oct 9, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heart signal comprising both first and second heart sounds and murmurs occurring due to various heart conditions is modeled by a sum of sinusoids automatically selected to represent the heart sound without a noise component. In an analysis step the signal parameters are measured, in an interpolation and transformation part .OMEGA.(t) and A(t) are interpolated from one window position to the next window position, and a synthesis part reconstructs the transformed heart signal. The transformations are transformations in either time scale (with unchanged frequency content) or frequency scale (with unchanged time progression), or both. Furthermore a dynamic transformation of an arbitrary heart signal to a fixed number of beats per minute is made possible.
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