Neural Fuzzy Techniques in Vehicle Acoustic Signal Classification

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dc.contributor.authorSampan, Somkiaten
dc.contributor.committeechairVanLandingham, Hugh F.en
dc.contributor.committeememberReed, Jeffrey H.en
dc.contributor.committeememberJames, Robert E.en
dc.contributor.committeememberBay, John S.en
dc.contributor.committeememberBaumann, William T.en
dc.contributor.committeememberRossi, John F.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:22:13Zen
dc.date.adate1998-08-17en
dc.date.available2014-03-14T20:22:13Zen
dc.date.issued1998-08-17en
dc.date.rdate1998-08-17en
dc.date.sdate1998-07-17en
dc.description.abstractVehicle acoustic signals have long been considered as unwanted traffic noise. In this research acoustic signals generated by each vehicle will be used to detect its presence and classify its type. Circular arrays of microphones were designed and built to detect desired signals and suppress unwanted ones. Circular arrays with multiple rings have an interesting and important property that is constant sidelobe levels. A modified genetic algorithm that can work directly with real numbers is used in the circular array design. It offers more effective ways to solve numerical problems than a standard genetic algorithm. In classifier design two main paradigms are considered: multilayer perceptrons and adaptive fuzzy logic systems. A multilayer perceptron is a network inspired by biological neural systems. Even though it is far from a biological system, it possesses the capability to solve many interesting problems in variety fields. Fuzzy logic systems, on the other hand, were inspired by human capabilities to deal with fuzzy terms. Its structures and operations are based on fuzzy set theory and its operations. Adaptive fuzzy logic systems are fuzzy logic systems equipped with training algorithms so that its rules can be extracted or modified from available numerical data similar to neural networks. Both fuzzy logic systems and multilayer perceptrons have been proved to be universal function approximators. Since there are approximations in almost every stage, both of these system types are good candidates for classification systems. In classification problems unequal learning of each class is normally encountered. This unequal learning may come from different learning difficulties and/or unequal numbers of training data from each class. The classifier tends to classify better for a well-learned class while doing poorly for other classes. Classification costs that may be different from class to class can be used to train and test a classifier. An error backpropagation algorithm can be modified so that the classification costs along with unequal learning factors can be used to control classifier learning during its training phase.en
dc.description.degreePh. D.en
dc.identifier.otheretd-5733142539751141en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-5733142539751141/en
dc.identifier.urihttp://hdl.handle.net/10919/30612en
dc.publisherVirginia Techen
dc.relation.haspartETD.PDFen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectacoustic signal classificationen
dc.subjectcircular arryen
dc.subjectmodified genetic algorithmen
dc.subjectmultilayer perceptronen
dc.subjectadaptive fuzzy logic systemen
dc.subjectbalance of area defuzzificationen
dc.titleNeural Fuzzy Techniques in Vehicle Acoustic Signal Classificationen
dc.typeDissertationen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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