The three-dimensional phonocardiogram after wavelet analyzing could describe all the information of frequency domain, timedomain and amplitude domain perfectly.
经小波变换的三维心音图更为直观详尽地反映出各组心音信号在不同时域、频域与强度范围内细节性的信息。
2
Ontology may evolve when the domain, time and application 'requirement change. Therefore, the evolution of ontology along with environment change become the key point of current research.