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Sistemas fiáveis de reconhecimento de voz
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ISBN10: 620220124X
ISBN13: 9786202201247
Publisher: Edicoes Nosso Conhecimento
Published: Sep 18 2025
Pages: 112
Weight: 0.35
Height: 0.27 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786202201247
Publisher: Edicoes Nosso Conhecimento
Published: Sep 18 2025
Pages: 112
Weight: 0.35
Height: 0.27 Width: 6.00 Depth: 9.00
Language: Portuguese
Nos últimos anos, embora o reconhecimento do altifalante seja bastante promissor, a sua adoção generalizada tem sido dificultada por um desempenho insuficiente, marcado pela sua baixa precisão e por problemas de fiabilidade. No entanto, a resolução destes desafios é essencial para explorar plenamente as capacidades do reconhecimento biométrico da voz, com inquéritos que indicam a preferência pela biometria vocal. Em situações em que é utilizada a autenticação biométrica por voz remota, a manutenção da integridade dos vectores de caraterÃsticas cepstrais extraÃdos torna-se fundamental na presença de ruÃdo de canal. Para melhorar a precisão do reconhecimento do locutor em aplicações remotas, é proposta uma nova abordagem em que são utilizados códigos LDPC (Low-Density Parity-Check) e códigos polares para o armazenamento e a transmissão de coeficientes cepstrais de frequência mel (MFCC) extraÃdos de amostras de voz. São descritos quatro métodos propostos e implementados que resultam em taxas de erro de bit mais baixas em canais ruidosos, bem como numa elevada taxa de exatidão para o sistema de reconhecimento remoto de altifalantes. Este livro conclui com a utilização sugestiva da codificação LDPC e Polar como parte integrante do reconhecimento remoto do locutor como parte do sistema de autenticação biométrica multimodal.
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