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dc.contributorEsquerra Llucià, Ignasi
dc.contributor.authorBrandau, Markus Albert
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.date.accessioned2008-04-25T07:59:37Z
dc.date.available2008-04-25T07:59:37Z
dc.date.issued2008-02
dc.identifier.urihttp://hdl.handle.net/2099.1/4858
dc.description.abstractIn this master thesis, a voice encryption system was programmed as a real-time software application. The idea was based on a previous graduation thesis and is meant to show an example of the possibilities of signal processing for educational use. The application uses a frequency scrambling technique on an audio signal taken from the computer microphone input and plays it scrambled back to the speakers, or other way around to descramble the signal. The basic idea is to use a frequency channel decomposition through digital signal filtering and down-sampling. Reassembling these sub-bands in a different order, a scrambled voice signal is the result. In addition, the scrambling process is embedded into a “software framework” which allows the use of an audio data stream from and to a sound card through different APIs so a computer platform real-time application can be accomplished.
dc.language.isoeng
dc.publisherUniversitat Politècnica de Catalunya
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació
dc.subjectÀrees temàtiques de la UPC::So, imatge i multimèdia
dc.subject.lcshData encryption (Computer science)
dc.subject.lcshSpeech Data processing
dc.titleImplementation of a real-time voice encryption system
dc.typeMaster thesis (pre-Bologna period)
dc.subject.lemacCodificació de veu
dc.subject.lemacEncriptació de dades (Informàtica)
dc.subject.lemacProcessament de senyals -- Tècniques digitals
dc.rights.accessOpen Access
dc.audience.educationlevelEstudis de primer/segon cicle
dc.audience.mediatorEscola Universitària d'Enginyeria Tècnica Industrial de Terrassa


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Attribution-NonCommercial-NoDerivs 2.5 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 2.5 Spain