Figure 4.
(a) Cardiac cycle of a heart sound signal; (b) First five IMF components of (a)'s signal; (c) Last four IMF components of (a)'s signal.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.