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Lokalizacja źródła dźwięku
w przestrzeni otwartej
Po co lokalizować źródło dźwięku?
Dźwięk, jako rozprzestrzeniające się drgania
cząsteczek, może rozchodzić się tylko w ośrodku
sprężystym jako fala dźwiękowa.
Implementacja
Otoczenie
Macierz mikrofonów
Przetworniki
Algorytmy DSP
Urządzenie wyświetlające wyniki
Gotowe rozwiązania
Technika Wojskowa
Macierz mikrofonów
Przestrzenne
rozmieszczenie
mikrofonów implikuje
zniekształcanie
docierających do
nich dźwięków:
Opóźnienia,
zmiany amplitudy,
zmiany widma
Przetworniki A/D
Wymagania:
● Wejście mikrofonowe
● Prędkość 44 Ksps
● Jakość 24 bity
● Wyjście cyfrowe szeregowe
Rozwiązanie AD1974 + 4szt SSM2166
SSM2166
●Kompletny przedwzmacniacz mikrofonowy
●Zasilanie niesymetryczne 5V
●Niskoszumny
●Zakres 20kHz
●Możliwość kompresji dźwięku
●Redukcji szumów (noise gate)
AD1974
●4 szt przetworników AD typu ΣΔ
●48Ksps na przetwornik
●Rozdzielczość 24 bity
●PLL
●Zakres dynamiki 107dB
●Zasilanie 3.3V części cyfrowej i analogowej
●Wejścia analogowe różnicowe
●Wyjścia cyfrowe - protokół SPI
Algorytmy DSP
●Filtracja świergotowa (chirp filtering)
●Odległości pomiędzy mikrofonami
●Zależności (czasowe, fazowe, amplitudowe)
Algorytmy zaimplementowane na platformie
FPGA / Procesorze DSP
Wyświetlanie wyników
Dowolność:
●Monitor,
●Ethernet, WiFi,
●UART, SPI
Algorytmy i platforma
Kodowanie: Matlab C++ ImpulseC VHDL
Software:
Algorytmy DSP,
filtrowanie środkowo-przepustowe,
porównywanie wektorów cech,
wyświetlanie wyników w postaci graficznej.
Możliwe problemy
Problemy ze znalezieniem niezawodnego,
„deterministycznego” algorytmu.
Problemy ze sprzętem.
Problemy z psychiką ;)
Możliwości dalszego rozwoju
Dostępność rozwiązania do zastosowań
komercyjnych.
Śledzenie niemilitarnych źródeł dźwięku:
●prowadzący konferencję,
●spikerka,
●pojazd wyścigowy,
●aktor w teatrze,
●zwierzęta ukryte w runie leśnym.
●Korekcja opóźnień w słyszeniu nurków
Dziękuję za uwagę
W razie potrzeby konsultacji w temacie
z@sep.szczecin.pl
Tel. 693848571
3,50PLN/min.

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