Estudo e aperfei?oamento de um vocoder de transformada senoidal

Detalhes bibliográficos
Autor(a) principal: Nascimento, F?bio Augusto Ribeiro do
Data de Publicação: 2004
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da INATEL
Texto Completo: http://tede.inatel.br:8080/tede/handle/tede/78
Resumo: A basic model of sinusoidal speech representation is presented and recent coding techniques of the model parameters are studied. As a complement, new methods for improving speech quality at 2.4 and 4.8 kbps using sinusoidal representation are presented. One of the methods presented is refinement in pitch estimation, since the precision of this estimation is essential for a sinusoidal harmonic model of speech. Another proposal is a more efficient procedure for the estimation of spectrum envelope parameters, which explores the psychoacoustic characteristic known as Subjective Loudness of the human hearing system. This technique was able to reduce the amount of parameters necessary to represent the envelopes of the spectrum without interfering in the final speech quality. It is also proposed an alternative approach to the synthetic phase composition step, in such a way that a better processing cost is obtained without degradation of quality. Experimental results indicate that using all of these methods in combination with the basic sinusoidal coding system increases the efficiency of the Sinusoidal Transform Vocoder operating at 2.4 and 4.8 kbps, improving the final speech quality and its Computational cost.
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spelling Silva, Francisco Jos? Fraga dahttp://lattes.cnpq.br/6574409043436708Silva, Francisco Jos? Fraga dahttp://lattes.cnpq.br/6574409043436708Ynoguti, Carlos Alberto156.167.778-70http://lattes.cnpq.br/5678667205895840Violaro, F?biohttp://lattes.cnpq.br/1810833808219352http://lattes.cnpq.br/0228608641509261Nascimento, F?bio Augusto Ribeiro do2017-01-10T12:53:01Z2004-07-30Nascimento, F?bio Augusto Ribeiro do. Estudo e aperfei?oamento de um vocoder de transformada senoidal. 2004. [73]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] .http://tede.inatel.br:8080/tede/handle/tede/78A basic model of sinusoidal speech representation is presented and recent coding techniques of the model parameters are studied. As a complement, new methods for improving speech quality at 2.4 and 4.8 kbps using sinusoidal representation are presented. One of the methods presented is refinement in pitch estimation, since the precision of this estimation is essential for a sinusoidal harmonic model of speech. Another proposal is a more efficient procedure for the estimation of spectrum envelope parameters, which explores the psychoacoustic characteristic known as Subjective Loudness of the human hearing system. This technique was able to reduce the amount of parameters necessary to represent the envelopes of the spectrum without interfering in the final speech quality. It is also proposed an alternative approach to the synthetic phase composition step, in such a way that a better processing cost is obtained without degradation of quality. Experimental results indicate that using all of these methods in combination with the basic sinusoidal coding system increases the efficiency of the Sinusoidal Transform Vocoder operating at 2.4 and 4.8 kbps, improving the final speech quality and its Computational cost.Um modelo b?sico de representa??o senoidal da fala ? apresentado e t?cnicas recentes de codifica??o dos par?metros do modelo s?o estudadas. Como complemento, apresentam-se novos m?todos para a melhoria da qualidade da fala a 2,4 e 4,8 kbps utilizando a representa??o senoidal. Um dos m?todos apresentados ? o refinamento na estimativa do pitch, uma vez que a precis?o dessa estimativa ? essencial para um modelo harm?nico senoidal da fala. Outra proposta ? um procedimento mais eficiente para a estimativa dos par?metros do envelope do espectro, o qual explora a caracter?stica psico-ac?stica conhecida como Subjective Loudness do sistema de audi??o humano. Esta t?cnica mostrou-se capaz de reduzir a quantidade de par?metros necess?rios para representar o envelopes do espectro sem interferir na qualidade final da fala. Prop?e-se tamb?m uma abordagem alternativa para a etapa de composi??o da fase sint?tica, de tal modo que um melhor custo de processamento ? obtido sem degrada??o de qualidade. Os resultados experimentais indicam que o uso de todos esses m?todos em combina??o com o sistema b?sico de codifica??o senoidal aumenta a efici?ncia do Vocoder de Transformada Senoidal operando a 2,4 e 4,8 kbps, melhorando-lhe a qualidade final da fala e o seu custo computacional.Submitted by Tede Dspace (tede@inatel.br) on 2017-01-10T12:53:01Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Sinusoidal_Coding.pdf: 771816 bytes, checksum: 99edd3af83e9cc079077992a0ce483db (MD5)Made available in DSpace on 2017-01-10T12:53:01Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Sinusoidal_Coding.pdf: 771816 bytes, checksum: 99edd3af83e9cc079077992a0ce483db (MD5) Previous issue date: 2004-07-30application/pdfhttp://tede.inatel.br:8080/jspui/retrieve/713/Sinusoidal_Coding.pdf.jpgporInstituto Nacional de Telecomunica??esMestrado em Engenharia de Telecomunica??esINATELBrasilInstituto Nacional de Telecomunica??eshttp://creativecommons.org/licenses/by-nd/4.0/info:eu-repo/semantics/openAccessCodifica??o senoidal; excita??o senoidal; modelo senoidalEngenharia - Telecomunica??esEstudo e aperfei?oamento de um vocoder de transformada senoidalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisreponame:Biblioteca Digital de Teses e Dissertações da INATELinstname:Instituto Nacional de Telecomunicações (INATEL)instacron:INATELLICENSElicense.txtlicense.txttext/plain; charset=utf-8112http://localhost:8080/tede/bitstream/tede/78/1/license.txtc6279291b293f0db82678eaa73a27769MD51CC-LICENSElicense_urllicense_urltext/plain; charset=utf-846http://localhost:8080/tede/bitstream/tede/78/2/license_url587cd8ffae15c8598ed3c46d248a3f38MD52license_textlicense_texttext/html; charset=utf-80http://localhost:8080/tede/bitstream/tede/78/3/license_textd41d8cd98f00b204e9800998ecf8427eMD53license_rdflicense_rdfapplication/rdf+xml; charset=utf-80http://localhost:8080/tede/bitstream/tede/78/4/license_rdfd41d8cd98f00b204e9800998ecf8427eMD54ORIGINALSinusoidal_Coding.pdfSinusoidal_Coding.pdfapplication/pdf771816http://localhost:8080/tede/bitstream/tede/78/5/Sinusoidal_Coding.pdf99edd3af83e9cc079077992a0ce483dbMD55THUMBNAILSinusoidal_Coding.pdf.jpgSinusoidal_Coding.pdf.jpgimage/jpeg3426http://localhost:8080/tede/bitstream/tede/78/6/Sinusoidal_Coding.pdf.jpg49d00ed465994f83146440e36f59798cMD56tede/782018-04-17 11:36:38.833oai:localhost:tede/78QXV0b3Jpem8gYSBwdWJsaWNhPz9vIGRhIG1pbmhhIERpc3NlcnRhPz9vIGRlIE1lc3RyYWRvLCBlbSBmb3JtYXRvIFBERiwgY29tIGJsb3F1ZWlvIGRlIGVkaT8/bywgY29sYWdlbSBlIGM/cGlhLg==Biblioteca Digital de Teses e Dissertaçõeshttp://tede.inatel.br:8080/jspui/PUBhttp://tede.inatel.br:8080/oai/requestbiblioteca@inatel.br || biblioteca.atendimento@inatel.bropendoar:2018-04-17T14:36:38Biblioteca Digital de Teses e Dissertações da INATEL - Instituto Nacional de Telecomunicações (INATEL)false
dc.title.por.fl_str_mv Estudo e aperfei?oamento de um vocoder de transformada senoidal
title Estudo e aperfei?oamento de um vocoder de transformada senoidal
spellingShingle Estudo e aperfei?oamento de um vocoder de transformada senoidal
Nascimento, F?bio Augusto Ribeiro do
Codifica??o senoidal; excita??o senoidal; modelo senoidal
Engenharia - Telecomunica??es
title_short Estudo e aperfei?oamento de um vocoder de transformada senoidal
title_full Estudo e aperfei?oamento de um vocoder de transformada senoidal
title_fullStr Estudo e aperfei?oamento de um vocoder de transformada senoidal
title_full_unstemmed Estudo e aperfei?oamento de um vocoder de transformada senoidal
title_sort Estudo e aperfei?oamento de um vocoder de transformada senoidal
author Nascimento, F?bio Augusto Ribeiro do
author_facet Nascimento, F?bio Augusto Ribeiro do
author_role author
dc.contributor.advisor1.fl_str_mv Silva, Francisco Jos? Fraga da
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/6574409043436708
dc.contributor.referee1.fl_str_mv Silva, Francisco Jos? Fraga da
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/6574409043436708
dc.contributor.referee2.fl_str_mv Ynoguti, Carlos Alberto
dc.contributor.referee2ID.fl_str_mv 156.167.778-70
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/5678667205895840
dc.contributor.referee3.fl_str_mv Violaro, F?bio
dc.contributor.referee3Lattes.fl_str_mv http://lattes.cnpq.br/1810833808219352
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/0228608641509261
dc.contributor.author.fl_str_mv Nascimento, F?bio Augusto Ribeiro do
contributor_str_mv Silva, Francisco Jos? Fraga da
Silva, Francisco Jos? Fraga da
Ynoguti, Carlos Alberto
Violaro, F?bio
dc.subject.por.fl_str_mv Codifica??o senoidal; excita??o senoidal; modelo senoidal
topic Codifica??o senoidal; excita??o senoidal; modelo senoidal
Engenharia - Telecomunica??es
dc.subject.cnpq.fl_str_mv Engenharia - Telecomunica??es
description A basic model of sinusoidal speech representation is presented and recent coding techniques of the model parameters are studied. As a complement, new methods for improving speech quality at 2.4 and 4.8 kbps using sinusoidal representation are presented. One of the methods presented is refinement in pitch estimation, since the precision of this estimation is essential for a sinusoidal harmonic model of speech. Another proposal is a more efficient procedure for the estimation of spectrum envelope parameters, which explores the psychoacoustic characteristic known as Subjective Loudness of the human hearing system. This technique was able to reduce the amount of parameters necessary to represent the envelopes of the spectrum without interfering in the final speech quality. It is also proposed an alternative approach to the synthetic phase composition step, in such a way that a better processing cost is obtained without degradation of quality. Experimental results indicate that using all of these methods in combination with the basic sinusoidal coding system increases the efficiency of the Sinusoidal Transform Vocoder operating at 2.4 and 4.8 kbps, improving the final speech quality and its Computational cost.
publishDate 2004
dc.date.issued.fl_str_mv 2004-07-30
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dc.identifier.citation.fl_str_mv Nascimento, F?bio Augusto Ribeiro do. Estudo e aperfei?oamento de um vocoder de transformada senoidal. 2004. [73]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] .
dc.identifier.uri.fl_str_mv http://tede.inatel.br:8080/tede/handle/tede/78
identifier_str_mv Nascimento, F?bio Augusto Ribeiro do. Estudo e aperfei?oamento de um vocoder de transformada senoidal. 2004. [73]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] .
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