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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.


Entire trace of sound source in polar coordination with degree angle and meter radius. Green → no rotation, red → CW, and black → CCW.
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f10-sensors-12-10584: Entire trace of sound source in polar coordination with degree angle and meter radius. Green → no rotation, red → CW, and black → CCW.

Mentions: Based on the uniform distribution random variable, the experimental data set is generated for the wide range of rotation, velocity, and position with equal likelihood. Figure 10 presents the 100 traces of sound source for the given experiment in polar coordination system and the red, black, and green lines reveal the rotation direction for CW, CCW, and no rotation respectively. The straight and spiral lines in Figure 10 illustrate the sound source with radial velocity, which is constant for the given time span. The sound source dissipates the signal for 30 seconds and the maximum radial velocity is 97.08 km/h in this experimental configuration. The rotation angle is fixed as the range from 90° to 270° due to the limitation of structure rotator which provides the DoA variation in a continuous and silent manner. The hanging RDD structure is connected by fishing wire at the position of 90° and 270°, and the wires are routed to the exterior of the chamber through a plastic sleeves on the wall. By pulling one of the wires, the RDD structure is rotated in CW or CCW direction. Due to the human operator, the angular velocity of the RDD structure is likely to be irregular; however, the structure is rotated with near silence.


Binaural sound localizer for azimuthal movement detection based on diffraction.

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

Entire trace of sound source in polar coordination with degree angle and meter radius. Green → no rotation, red → CW, and black → CCW.
© Copyright Policy
Related In: Results  -  Collection

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

f10-sensors-12-10584: Entire trace of sound source in polar coordination with degree angle and meter radius. Green → no rotation, red → CW, and black → CCW.
Mentions: Based on the uniform distribution random variable, the experimental data set is generated for the wide range of rotation, velocity, and position with equal likelihood. Figure 10 presents the 100 traces of sound source for the given experiment in polar coordination system and the red, black, and green lines reveal the rotation direction for CW, CCW, and no rotation respectively. The straight and spiral lines in Figure 10 illustrate the sound source with radial velocity, which is constant for the given time span. The sound source dissipates the signal for 30 seconds and the maximum radial velocity is 97.08 km/h in this experimental configuration. The rotation angle is fixed as the range from 90° to 270° due to the limitation of structure rotator which provides the DoA variation in a continuous and silent manner. The hanging RDD structure is connected by fishing wire at the position of 90° and 270°, and the wires are routed to the exterior of the chamber through a plastic sleeves on the wall. By pulling one of the wires, the RDD structure is rotated in CW or CCW direction. Due to the human operator, the angular velocity of the RDD structure is likely to be irregular; however, the structure is rotated with near silence.

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.