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Adaptacyjne formowanie wiązki GSC w podpasmie przy użyciu L.Mic-Array do wzmocnienia mowy
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ISBN10: 6209258867
ISBN13: 9786209258862
Publisher: Wydawnictwo Nasza Wiedza
Published: Nov 18 2025
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Polish
ISBN13: 9786209258862
Publisher: Wydawnictwo Nasza Wiedza
Published: Nov 18 2025
Pages: 56
Weight: 0.19
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Polish
Książka przedstawia opis, projekt i wdrożenie 4-kanalowego ukladu mikrofonowego, który jest adaptacyjnym formatorem wiązki z ogólnym tlumieniem bocznych pasm (GSC) wykorzystywanym do wideokonferencji, telefonii bez użycia rąk itp. w halaśliwym otoczeniu w celu poprawy jakości mowy oraz tlumienia halasu. Tlumienie bocznych pasm oceniono zarówno za pomocą adaptacji metodą najmniejszych średnich kwadratów (LMS), jak i znormalizowanych najmniejszych średnich kwadratów (NLMS). Przedstawiono strukturę testową, która obejmuje liniowy uklad 4 mikrofonów polączonych w celu gromadzenia danych. Testy przeprowadzono przy użyciu jednego źródla sygnalu docelowego i jednego źródla szumu. W każdym mikrofonie dane byly gromadzone za pomocą filtrowania z ulamkowym opóźnieniem czasowym, a następnie dzielone na podpasma i stosowano GSC do każdego z kolejnych podpasm. Ogólną poprawę stosunku sygnalu do szumu (SNR) określa się na podstawie mocy wejściowej i wyjściowej glównego sygnalu i szumu, przy czym jako dane wejściowe do GSC wykorzystuje się wylącznie sygnal lub wylącznie szum. Algorytm NLMS znacznie poprawia jakośc mowy, zapewniając poziom tlumienia szumu do 13 dB, podczas gdy algorytm LMS zapewnia poziom do 10 dB.
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