Wavelet and Spectral Analysis of Normal and Abnormal Heart Sound for Diagnosing Cardiac Disorders

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Features</td><td class="align_center">Maximum value of abnormal samples for threshold selection</td><td class="align_center">Minimum value of Normal samples for threshold selection</td><td class="align_center">Range for threshold</td><td class="align_center">Feature considered for separation of healthy and unhealthy heart sounds</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">Absolute mean: signal amplitude</td><td class="align_center">0.07</td><td class="align_center">0.09</td><td class="align_center">0.07-0.09</td><td class="align_center">Yes</td></tr><tr><td class="align_left">Variance</td><td class="align_center">0.01</td><td class="align_center">0.015</td><td class="align_center">0.01-0.015</td><td class="align_center">Yes</td></tr><tr><td class="align_left">Energy of DWT</td><td 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393C65 331 23 225 23 139C23 14 96 -12 146 -12C198 -12 280 9 367 101L351 124C300 78 242 48 194 48C129 48 109 107 109 162V191C208 213 391 266 391 364ZM313 350C313 305 268 261 113 223C132 334 187 381 217 398C227 404 244 405 261 405C290 405 313 385 313 350Z"></path></g><g transform="matrix(.013,0,0,-0.013,68.062,0)"><path d="M535 230V280H52V230H535Z"></path></g><g transform="matrix(.013,0,0,-0.013,78.598,0)"><path d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z"></path></g><g transform="matrix(.013,0,0,-0.013,84.838,0)"><path d="M153 550H386L412 615L406 623H120L82 318C104 327 142 338 184 338C294 338 347 275 347 187C347 112 305 39 221 39C160 39 119 71 97 89C88 97 80 96 71 90C59 80 50 67 49 57C48 45 52 36 66 23C80 9 123 -12 169 -12C221 -11 288 15 342 59C403 109 431 165 431 225C431 308 366 395 238 395C212 395 165 379 127 364L153 550Z"></path></g></svg></span></td><td class="align_center">Yes</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Range of threshold for automatic cardiac disorder detection to distinguish between normal and abnormal heart sounds.</div>

BioMed Research International

tab1

Table 1

Table 1: Wavelet and Spectral Analysis of Normal and Abnormal Heart Sound for Diagnosing Cardiac Disorders 