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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.


(a) Dimension (in millimeter) of RDD. (b) Actual structure of RDD.
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f5-sensors-12-10584: (a) Dimension (in millimeter) of RDD. (b) Actual structure of RDD.

Mentions: The design of the RDD is demonstrated in Figure 5 below. The inner hole of the structure is reserved for the receiver location. The profile oblique, which stands for the path between the barrier edge and receiver, is devised to be the extent from 110.31 mm to 199.91 mm along with the outer circumference of the RDD. For the horizontal arrangement of the sound source, the R in the Equation (2) is the 100 mm and overall length of the path difference is from the 10.31 mm to 99.91 mm. The simulated level reduction ratio exhibits the value from 0.3 to 0.1 in Figure 4; hence, the graph segment shown in Figure 4 confirms the high gradient area. The final physical structure of the RDD is fabricated by the 3D printer (Dimension; 768 Series) with white ABS plastic material. Note that the entire construction is built by assembling the four small fractions due to the size limitation of the 3D printer.


Binaural sound localizer for azimuthal movement detection based on diffraction.

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

(a) Dimension (in millimeter) of RDD. (b) Actual structure of RDD.
© Copyright Policy
Related In: Results  -  Collection

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

f5-sensors-12-10584: (a) Dimension (in millimeter) of RDD. (b) Actual structure of RDD.
Mentions: The design of the RDD is demonstrated in Figure 5 below. The inner hole of the structure is reserved for the receiver location. The profile oblique, which stands for the path between the barrier edge and receiver, is devised to be the extent from 110.31 mm to 199.91 mm along with the outer circumference of the RDD. For the horizontal arrangement of the sound source, the R in the Equation (2) is the 100 mm and overall length of the path difference is from the 10.31 mm to 99.91 mm. The simulated level reduction ratio exhibits the value from 0.3 to 0.1 in Figure 4; hence, the graph segment shown in Figure 4 confirms the high gradient area. The final physical structure of the RDD is fabricated by the 3D printer (Dimension; 768 Series) with white ABS plastic material. Note that the entire construction is built by assembling the four small fractions due to the size limitation of the 3D printer.

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.