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Binaural sound localizer for azimuthal movement detection based on diffraction.

Kim K, Choi A - Sensors (Basel) (2012)

Bottom Line: The gradient analysis of the ILD between the structured and unstructured microphone demonstrates the rotation directions as clockwise, counter clockwise, and no rotation of the sound source.Acoustic experiments with different types of sound source over a wide range of target movements show that the average true positive and false positive rates are 67% and 16%, respectively.Spectral analysis demonstrates that the low frequency delivers decreased true and false positive rates and the high frequency presents increases of both rates, overall.

View Article: PubMed Central - PubMed

Affiliation: Division of Electronics & Electrical Engineering, Dongguk University-Seoul, Seoul 100-715, Korea. kwkim@dongguk.edu

ABSTRACT
Sound localization can be realized by utilizing the physics of acoustics in various methods. This paper investigates a novel detection architecture for the azimuthal movement of sound source based on the interaural level difference (ILD) between two receivers. One of the microphones in the system is surrounded by barriers of various heights in order to cast the direction dependent diffraction of the incoming signal. The gradient analysis of the ILD between the structured and unstructured microphone demonstrates the rotation directions as clockwise, counter clockwise, and no rotation of the sound source. Acoustic experiments with different types of sound source over a wide range of target movements show that the average true positive and false positive rates are 67% and 16%, respectively. Spectral analysis demonstrates that the low frequency delivers decreased true and false positive rates and the high frequency presents increases of both rates, overall.

No MeSH data available.


Level reduction ratio of the barrier. Solid box indicates design range of RDD structure.
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f4-sensors-12-10584: Level reduction ratio of the barrier. Solid box indicates design range of RDD structure.

Mentions: Using Equation (1), the level of reduction ratio is illustrated in Figure 4 below with input parameter as the path length difference. Notice that the path length difference is proportional to the height length in this configuration because of the fixed receiver location. While the tallness of the barrier is extremely low, the propagated level is relatively low around 55% of the original magnitude due to the diffraction of the acoustic signal over the edge. The practically direct path signal is scattered by the short barrier which establishes the near line of sight between the source and receiver. In Figure 4, the higher gradient indicates the more prominent sensitivity of level variation over the path length difference. Approximately the range from the 3 mm up to the tenths of the centimeter reveals the target scope of the design factor.


Binaural sound localizer for azimuthal movement detection based on diffraction.

Kim K, Choi A - Sensors (Basel) (2012)

Level reduction ratio of the barrier. Solid box indicates design range of RDD structure.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472845&req=5

f4-sensors-12-10584: Level reduction ratio of the barrier. Solid box indicates design range of RDD structure.
Mentions: Using Equation (1), the level of reduction ratio is illustrated in Figure 4 below with input parameter as the path length difference. Notice that the path length difference is proportional to the height length in this configuration because of the fixed receiver location. While the tallness of the barrier is extremely low, the propagated level is relatively low around 55% of the original magnitude due to the diffraction of the acoustic signal over the edge. The practically direct path signal is scattered by the short barrier which establishes the near line of sight between the source and receiver. In Figure 4, the higher gradient indicates the more prominent sensitivity of level variation over the path length difference. Approximately the range from the 3 mm up to the tenths of the centimeter reveals the target scope of the design factor.

Bottom Line: The gradient analysis of the ILD between the structured and unstructured microphone demonstrates the rotation directions as clockwise, counter clockwise, and no rotation of the sound source.Acoustic experiments with different types of sound source over a wide range of target movements show that the average true positive and false positive rates are 67% and 16%, respectively.Spectral analysis demonstrates that the low frequency delivers decreased true and false positive rates and the high frequency presents increases of both rates, overall.

View Article: PubMed Central - PubMed

Affiliation: Division of Electronics & Electrical Engineering, Dongguk University-Seoul, Seoul 100-715, Korea. kwkim@dongguk.edu

ABSTRACT
Sound localization can be realized by utilizing the physics of acoustics in various methods. This paper investigates a novel detection architecture for the azimuthal movement of sound source based on the interaural level difference (ILD) between two receivers. One of the microphones in the system is surrounded by barriers of various heights in order to cast the direction dependent diffraction of the incoming signal. The gradient analysis of the ILD between the structured and unstructured microphone demonstrates the rotation directions as clockwise, counter clockwise, and no rotation of the sound source. Acoustic experiments with different types of sound source over a wide range of target movements show that the average true positive and false positive rates are 67% and 16%, respectively. Spectral analysis demonstrates that the low frequency delivers decreased true and false positive rates and the high frequency presents increases of both rates, overall.

No MeSH data available.