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dc.contributor.authorSeverson, Jared
dc.date.accessioned2012-03-14T17:41:29Z
dc.date.available2012-03-14T17:41:29Z
dc.date.issued2009-02
dc.identifier.urihttps://hdl.handle.net/10945/4301
dc.descriptionCIVINS (Civilian Institutions) Thesis documenten_US
dc.description.abstractMarine mammal whistle calls present an attractive medium for covert underwater communications. High quality models of the whistle calls are needed in order to synthesize natural-sounding whistles with embedded information. Since the whistle calls are composed of frequency modulated harmonic tones, they are best modeled as a weighted superposition of harmonically related sinusoids. Previous research with bottlenose dolphin whistle calls has produced synthetic whistles that sound too clean for use in a covert communications system. Due to the sensitivity of the human auditory system, watermarking schemes that slightly modify the fundamental frequency contour have good potential for producing natural-sounding whistles embedded with retrievable watermarks. Structured total least squares is used with linear prediction analysis to track the time-varying fundamental frequency and harmonic amplitude contours throughout a whistle call. Simulation and experimental results demonstrate the capability to accurately model bottlenose dolphin whistle calls and retrieve embedded information from watermarked synthetic whistle calls.en_US
dc.description.urihttp://archive.org/details/modelingndfreque109454301
dc.format.extent107 p. : ill.en_US
dc.language.isoen_US
dc.publisherMonterey California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.subject.lcshAquatic animalsen_US
dc.subject.lcshHearingen_US
dc.subject.lcshMammalsen_US
dc.subject.lcshDolphinsen_US
dc.titleModeling and frequency tracking of marine mammal whistle callsen_US
dc.typeThesisen_US
dc.contributor.corporateMassachusetts Institute of Technology and the Woods Hole Oceanographic Institution.
dc.description.funderContract number: N62271-97-G-0026.en_US
dc.description.funderCIVINSen_US
dc.identifier.oclc3144
etd.thesisdegree.grantorCambridge, Massachusetts : Massachusetts Institute of Technology (MIT)en_US
etd.thesisdegree.grantorWoods Hole Oceanographic Institutionen_US
etd.verifiednoen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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