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Formação de feixe GSC de subfaixa adaptativa usando L.Mic-Array para amplificação de voz
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ISBN10: 6209261426
ISBN13: 9786209261428
Publisher: Edicoes Nosso Conhecimento
Published: Nov 18 2025
Pages: 52
Weight: 0.18
Height: 0.12 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209261428
Publisher: Edicoes Nosso Conhecimento
Published: Nov 18 2025
Pages: 52
Weight: 0.18
Height: 0.12 Width: 6.00 Depth: 9.00
Language: Portuguese
Este livro apresenta a descrição, o design e a implementação de um conjunto de microfones de 4 canais que é um formador de feixe adaptativo de cancelador de lóbulo lateral generalizado (GSC) de sub-banda usado para videoconferência, telefonia mãos-livres, etc., em um ambiente ruidoso para aprimoramento da fala, bem como supressão de ruÃdo. O cancelador de lóbulo lateral foi avaliado com adaptação de MÃnimo Quadrado Médio (LMS) e MÃnimo Quadrado Médio Normalizado (NLMS). É apresentada uma estrutura de teste que envolve um conjunto linear de 4 microfones conectados para coletar os dados. Os testes foram realizados utilizando uma fonte de sinal alvo e uma fonte de ruÃdo. Em cada microfone, os dados foram coletados através de filtragem de atraso de tempo fracionário, depois divididos em sub-bandas e aplicados GSC a cada uma das sub-bandas subsequentes. A melhoria geral da relação sinal-ruÃdo (SNR) é determinada a partir das potências de entrada e saÃda do sinal principal e do ruÃdo, com apenas sinal e apenas ruÃdo como entrada para o GSC. O algoritmo NLMS melhora significativamente a qualidade da fala com nÃveis de supressão de ruÃdo de até 13 dB, enquanto o algoritmo LMS oferece até 10 dB.
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