<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-9532</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. ing. bioméd]]></abbrev-journal-title>
<issn>0188-9532</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ingeniería Biomédica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-95322023000400006</article-id>
<article-id pub-id-type="doi">10.17488/rmib.44.4.1</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comparison of Spectral and Sparse Feature Extraction Methods for Heart Sounds Classification]]></article-title>
<article-title xml:lang="es"><![CDATA[Comparación de Métodos de Extracción de Características Espectrales y Dispersas para Clasificación de Sonidos Cardíacos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibarra-Hernández]]></surname>
<given-names><![CDATA[Roilhi Frajo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso-Arévalo]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Canseco]]></surname>
<given-names><![CDATA[Eloísa del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ensenada  ]]></institution>
<addr-line><![CDATA[Ensenada ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada  ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Baja California  ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>44</volume>
<numero>spe1</numero>
<fpage>6</fpage>
<lpage>22</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-95322023000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-95322023000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-95322023000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Cardiovascular diseases (CVDs) remain the leading cause of morbidity worldwide. The heart sound signal or phonocardiogram (PCG) is the most simple, low-cost, and effective tool to assist physicians in diagnosing CVDs. Advances in signal processing and machine learning have motivated the design of computer-aided systems for heart illness detection based only on the PCG. The objective of this work is to compare the effects of using spectral and sparse features for a classification scheme to detect the presence/absence of a pathological state in a heart sound signal, more specifically, sparse representations using Matching Pursuit with multiscale Gabor time-frequency dictionaries, linear prediction coding, and Mel-frequency cepstral coefficients. This work compares the performance of PCGs classification applying features as a result of averaging the samples or the features for each PCG sound event when feeding a random forest (RF) classifier. For data balancing, random under-sampling and synthetic minority oversampling (SMOTE) methods were applied. Furthermore, we compare the Correlation Feature Selection (CFS) and Information Gain (IG) for the dimensionality reduction. The findings show a SE=93.17 %, SP=84.32 % and ACC=85.9 % when joining MP+LPC+MFCC features set with an AUC=0.969 showing that these features are promising to be used in heart sounds anomaly detection schemes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las enfermedades cardiovasculares (ECVs) han persistido como la principal causa de mortalidad en el mundo. La señal de audio cardiaco o fonocardiograma (FCG) es la herramienta más simple, efectiva y de bajo costo para auxiliar a especialistas diagnosticando ECVs. Los avances en el procesamiento de señales y aprendizaje máquina han motivado el diseño de auscultación y detección computarizada. El objetivo de este trabajo es comparar el uso de características espectrales y dispersas para un sistema de clasificación que detecte la presencia/ausencia de una patología en un audio cardiaco mediante representaciones dispersas usando Matching Pursuit con diccionarios de Gabor tiempo-frequencia, predicción lineal y coeficientes cepstrales Mel. Se crearon 5 conjuntos de características como resultado de combinar las características para cada FCG y se examinó su desempeño usando un clasificador de bosque aleatorio (RF). Se aplicaron métodos de balanceo de muestras basados en sobremuestreo (SMOTE) y submuestreo aleatorio. Se compararon métodos de selección de características por correlación (CFS) y ganancia de información (IG) para reducir la dimensionalidad del conjunto. Los resultados muestran métricas de SE=93.17 %, SP=84.32 % y ACC=85.9 % al juntar los parámetros MP+LPC+MFCC además de una AUC=0.969. El trabajo muestra el potencial de las características espectrales y escasas para la detección de patologías en señales de audio cardiaco.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[classification]]></kwd>
<kwd lng="en"><![CDATA[heart sounds]]></kwd>
<kwd lng="en"><![CDATA[matching pursuit]]></kwd>
<kwd lng="en"><![CDATA[spectral features]]></kwd>
<kwd lng="en"><![CDATA[time-frequency representation]]></kwd>
<kwd lng="es"><![CDATA[características espectrales]]></kwd>
<kwd lng="es"><![CDATA[clasificación]]></kwd>
<kwd lng="es"><![CDATA[matching pursuit]]></kwd>
<kwd lng="es"><![CDATA[representación tiempo-frecuencia]]></kwd>
<kwd lng="es"><![CDATA[sonidos cardiacos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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