Single-Frequency Ultrasound-Based Respiration Rate Estimation with Smartphones

<div>Mean estimation error versus threshold window size <span class="nowrap"><svg height="11.9316pt" id="M61" style="vertical-align:-3.2957pt" version="1.1" viewbox="-0.0498162 -8.6359 19.2796 11.9316" width="19.2796pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M962 650H739L732 622L760 619C812 613 819 604 798 552C760 457 671 267 606 131H604L511 638H480L237 131H233L183 554C177 607 183 614 226 619L248 622L257 650H24L17 622C88 615 92 611 103 524L173 -11H203L450 491H453L543 -11H575L839 529C882 609 886 613 953 622L962 650Z" id="g113-88"></path></g><g transform="matrix(.0091,0,0,-0.0091,10.777,3.132)"><path d="M303 37L293 66C280 59 256 49 231 49S173 63 173 143V396H281C294 404 298 428 287 439H173V575L158 577L92 509V439H46L17 408L22 396H92V107C92 27 128 -12 192 -12C203 -12 218 -9 237 2L303 37Z" id="g58-114"></path></g><g transform="matrix(.0091,0,0,-0.0091,13.662,3.132)"><path d="M522 0V30C462 35 455 41 455 106V280C455 397 397 451 314 451C262 451 206 414 171 379V710C131 698 69 682 20 675V647C87 642 90 637 90 574V106C90 41 80 35 20 30V0H236V30C176 35 171 43 171 106V339C198 371 237 391 276 391C341 391 374 350 374 269V106C374 43 367 35 308 30V0H522Z" id="g58-102"></path></g></svg>.</span></div>

Computational and Mathematical Methods in Medicine

fig12

Figure 12

Figure 12: Single-Frequency Ultrasound-Based Respiration Rate Estimation with Smartphones 