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Multiple sound sources localization in free field using acoustic vector sensor.

Kotus J - Multimed Tools Appl (2015)

Bottom Line: The setup of the experiment and obtained results were described in details in the text.Taking the obtained results into consideration is important to emphasize that the localization of the multiple sound sources using single acoustic vector sensor is possible.The localization accuracy was the best for signals which spectral energy distribution was different.

View Article: PubMed Central - PubMed

Affiliation: Multimedia Systems Department, Gdansk University of Technology, Narutowicza 11-12, 80-233 Gdansk, Poland.

ABSTRACT

Method and preliminary results of multiple sound sources localization in free field using the acoustic vector sensor were presented in this study. Direction of arrival (DOA) for considered source was determined based on sound intensity method supported by Fourier analysis. Obtained spectrum components for considered signal allowed to determine the DOA value for the particular frequency independently. The accuracy of the developed and practically implemented algorithm was evaluated on the basis of laboratory tests. Both synthetic acoustic signals (pure tones and noises) and real sounds were used during the measurements. Real signals had the same or different energy distribution both on time and frequency domain. The setup of the experiment and obtained results were described in details in the text. Taking the obtained results into consideration is important to emphasize that the localization of the multiple sound sources using single acoustic vector sensor is possible. The localization accuracy was the best for signals which spectral energy distribution was different.

No MeSH data available.


Tested overlapping configuration. Green rectangles – current frame, red – next frame
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Fig10: Tested overlapping configuration. Green rectangles – current frame, red – next frame

Mentions: Another issue that was considered in evaluation process was the length of overlap used in the FFT calculations. Three different overlap values were tested: 0 %, 50 % and 75 %. It was explained in Fig. 10. Particular FFT frames were marked with different color. It means that in the next FFT frame from 4096 to 1024 samples were new. On the other hand for 4096 signal samples from 1 to 4 FFT frames were calculated. The FFT calculations were performed for each acoustic components separately. In Figs. 11 and 12 time distribution of DOA values for different overlapping lengths were presented. The results for impulse sounds like shots or broken glass were shown.Fig. 10


Multiple sound sources localization in free field using acoustic vector sensor.

Kotus J - Multimed Tools Appl (2015)

Tested overlapping configuration. Green rectangles – current frame, red – next frame
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4551168&req=5

Fig10: Tested overlapping configuration. Green rectangles – current frame, red – next frame
Mentions: Another issue that was considered in evaluation process was the length of overlap used in the FFT calculations. Three different overlap values were tested: 0 %, 50 % and 75 %. It was explained in Fig. 10. Particular FFT frames were marked with different color. It means that in the next FFT frame from 4096 to 1024 samples were new. On the other hand for 4096 signal samples from 1 to 4 FFT frames were calculated. The FFT calculations were performed for each acoustic components separately. In Figs. 11 and 12 time distribution of DOA values for different overlapping lengths were presented. The results for impulse sounds like shots or broken glass were shown.Fig. 10

Bottom Line: The setup of the experiment and obtained results were described in details in the text.Taking the obtained results into consideration is important to emphasize that the localization of the multiple sound sources using single acoustic vector sensor is possible.The localization accuracy was the best for signals which spectral energy distribution was different.

View Article: PubMed Central - PubMed

Affiliation: Multimedia Systems Department, Gdansk University of Technology, Narutowicza 11-12, 80-233 Gdansk, Poland.

ABSTRACT

Method and preliminary results of multiple sound sources localization in free field using the acoustic vector sensor were presented in this study. Direction of arrival (DOA) for considered source was determined based on sound intensity method supported by Fourier analysis. Obtained spectrum components for considered signal allowed to determine the DOA value for the particular frequency independently. The accuracy of the developed and practically implemented algorithm was evaluated on the basis of laboratory tests. Both synthetic acoustic signals (pure tones and noises) and real sounds were used during the measurements. Real signals had the same or different energy distribution both on time and frequency domain. The setup of the experiment and obtained results were described in details in the text. Taking the obtained results into consideration is important to emphasize that the localization of the multiple sound sources using single acoustic vector sensor is possible. The localization accuracy was the best for signals which spectral energy distribution was different.

No MeSH data available.