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dc.contributor.advisorMoose, Paul H.
dc.contributor.authorDiGirolamo, Vincent
dc.dateSeptember 1985
dc.date.accessioned2012-11-26T23:59:59Z
dc.date.available2012-11-26T23:59:59Z
dc.date.issued1985-09
dc.identifier.urihttp://hdl.handle.net/10945/21142
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractFrequency transposition is the process of raising or lowering the frequency content (pitch) of an audio signal. The hearing impaired community has the greatest interest in the application of frequency transposition. Though several analog and digital frequency transposing hearing aid systems have been built and tested, this investigates a possible digital processing alternative. Pole shifting, in the z-domain of an autoregressive (all pole) model of speech was proven to be a viable theory for changing frequency content Since linear predictive coding (LPC) techniques are used to code, analyze and synthesize speech, with the resulting LPC coefficients related to the coefficients of an equivalent autoregressive model, a linear relationships between LPC coefficients and frequency transposition is explored. This theoretical relationship is first established using a pure sine wave and then is extended into processing speech. The resulting speech synthesis experiments failed to substantiate the conjectures of this thesis. However, future research avenues are suggested that may lead to a viable approach to transpose speech.en_US
dc.description.urihttp://archive.org/details/analysisofdigita00digi
dc.language.isoen_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.lcshElectrical engineeringen_US
dc.titleAnalysis of a digital technique for frequency transposition of speechen_US
dc.typeThesisen_US
dc.contributor.secondreaderMadan, Bharat B.
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentDepartment of Electrical and Computer Engineering
dc.subject.authorFrequency transpositionen_US
dc.subject.authorSpeechen_US
dc.subject.authorHearing impaireden_US
dc.subject.authorPole shiftingen_US
dc.subject.authorFrequency contenten_US
dc.subject.authorLinear predictive codingen_US
dc.subject.authorReflection coefficienten_US
dc.subject.authorLPC parametersen_US
dc.subject.authorSpeech processingen_US
dc.description.serviceLieutenant, United States NAvyen_US
etd.thesisdegree.nameM.S. in Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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