APPARATUS FOR DIAGNOSING CARDIAC DISORDER BY COMBINING HIDDEN MARKOV MODEL AND MURMUR LOG-LIKELYHOOD

摘要

PURPOSE: An apparatus for diagnosing cardiac disorder by combining an HMM with a murmur log-likelihood is provided to early diagnose the cardiac disorder by using a cardiac signal obtained by an electronic stethoscope. CONSTITUTION: An HMM(Hidden Markov Model) log-likelihood extracting unit(102) extracts a log-likelihood of a state unit from a single cycle cardiac signal. A murmur log-likelihood extracting unit(103) extracts a murmur log-likelihood of a state unit according to a cardiac disorder from a single cycle cardiac signal. The cardiac disorder is determined by using the HMM log-likelihood and the murmur log-likelihood. [Reference numerals] (101) Automatic segmentation algorithm; (102-1) Mel frequency cepstrum coefficient; (102-2) State segmentation unit; (102-3) State unit HMM log-likelihood unit; (103-1) Normal heart sound band; (103-2) Murmur band; (103-3) Normal heart sound band murmur probability unit; (103-4) Murmur band murmur probability unit; (103-5) State unit murmur log-likelihood unit; (AA) Continuous heart sound signal; (BB) Heart disease classification