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Among others, wearables recording seismic waves induced on the chest surface by the mechanical activity of the heart are becoming popular. For what concerns wearable-based methods, cardiac vibrations can be recorded from the thorax in the form of acceleration, angular velocity, and\/or displacement by means of accelerometers, gyroscopes, and fiber optic sensors, respectively. The present paper reviews the currently available wearables for measuring precordial vibrations. The focus is on sensor technology and signal processing techniques for the extraction of the parameters of interest. Lastly, the explored application scenarios and experimental protocols with the relative influencing factors are discussed for each technique. The goal is to delve into these three fundamental aspects (i.e., wearable system, signal processing, and application scenario), which are mutually interrelated, to give a holistic view of the whole process, beyond the sensor aspect alone. The reader can gain a more complete picture of this context without disregarding any of these 3 aspects.<\/jats:p>","DOI":"10.3390\/s22155805","type":"journal-article","created":{"date-parts":[[2022,8,3]],"date-time":"2022-08-03T23:33:01Z","timestamp":1659569581000},"page":"5805","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Precordial Vibrations: A Review of Wearable Systems, Signal Processing Techniques, and Main Applications"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5542-843X","authenticated-orcid":false,"given":"Francesca","family":"Santucci","sequence":"first","affiliation":[{"name":"Unit of Automatic Control, Departmental Faculty of Engineering, Universit\u00e0 Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1507-231X","authenticated-orcid":false,"given":"Daniela","family":"Lo Presti","sequence":"additional","affiliation":[{"name":"Unit of Measurements and Biomedical Instrumentation, Departmental Faculty of Engineering, Universit\u00e0 Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3090-5623","authenticated-orcid":false,"given":"Carlo","family":"Massaroni","sequence":"additional","affiliation":[{"name":"Unit of Measurements and Biomedical Instrumentation, Departmental Faculty of Engineering, Universit\u00e0 Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9696-1265","authenticated-orcid":false,"given":"Emiliano","family":"Schena","sequence":"additional","affiliation":[{"name":"Unit of Measurements and Biomedical Instrumentation, Departmental Faculty of Engineering, Universit\u00e0 Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8792-2520","authenticated-orcid":false,"given":"Roberto","family":"Setola","sequence":"additional","affiliation":[{"name":"Unit of Automatic Control, Departmental Faculty of Engineering, Universit\u00e0 Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,3]]},"reference":[{"key":"ref_1","unstructured":"World Health Organization (2020). 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