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Formazione del fascio GSC a sottobanda adattiva utilizzando L.Mic-Array per il potenziamento del parlato by Mamun Ahmed

Formazione del fascio GSC a sottobanda adattiva utilizzando L.Mic-Array per il potenziamento del parlato

by Mamun Ahmed
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Book cover type: Paperback
  • ISBN13: 9786209256301
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Edizioni Sapienza
  • Publisher Imprint: Edizioni Sapienza
  • Publication Date:
  • Pages: 56
  • Original Price: GBP 34.71
  • Language: Italian
  • Edition: N/A
  • Item Weight: 87 grams
  • BISAC Subject(s): Electronics / General

Questo libro presenta la descrizione, la progettazione e l'implementazione di un array microfonico a 4 canali che � un beam former adattivo con cancellatore di lobi laterali generalizzato (GSC) utilizzato per videoconferenze, telefonia in vivavoce, ecc., in un ambiente rumoroso per il miglioramento del parlato e la soppressione del rumore. Il cancellatore di lobi laterali � stato valutato con adattamento sia LMS (Least Mean Square) che NLMS (Normalized Least Mean Square). Viene presentata una struttura di prova che prevede un array lineare a 4 microfoni collegati per la raccolta dei dati. I test sono stati effettuati utilizzando una sorgente di segnale target e una sorgente di rumore. In ciascun microfono, i dati sono stati raccolti tramite un filtro a ritardo temporale frazionario, quindi sono stati suddivisi in sottobande e applicati al GSC a ciascuna delle sottobande successive. Il miglioramento complessivo del rapporto segnale/rumore (SNR) � determinato dalle potenze di ingresso e uscita del segnale principale e del rumore, con solo segnale e solo rumore come input per il GSC. L'algoritmo NLMS migliora significativamente la qualit� del parlato con livelli di soppressione del rumore fino a 13 dB, mentre l'algoritmo LMS offre fino a 10 dB.

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