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.
Highlights
As an acoustic wave travels through a certain medium, the waveform usually contains a variety of cues from the spatial propagation
The major goal of the rotation direction detector (RDD) system designed in this paper is to identify the direction of azimuthal movement from the sound source by using the two microphones
Four sound sources selected are airplane, helicopter, car, and jet airplane which are recorded at the fixed location over the moving object
Summary
As an acoustic wave travels through a certain medium, the waveform usually contains a variety of cues from the spatial propagation. The physics of the acoustics are extensive, including signal processing, stochastic processing, etc., by employing the acquired data from amplitude, frequency, and phase of the waveform. The intelligent design of the sender and receiver structure improves the localization performance significantly compared to the isotropic system due to the extra spatial clues. Most animals in Nature perform excellent sound localization tasks with binaural auditory systems which use the comprehensive knowledge of the waveform data. Median plane localization performance is acceptable in spite of the high ambiguity of the structure for vertical discrimination [1]. The attained spatial hearing is the result of combining the physical, psychophysical, and psychological aspects of auditory information processing such as interaural level difference (ILD), interaural time difference (ITD), spectral cues, etc. The attained spatial hearing is the result of combining the physical, psychophysical, and psychological aspects of auditory information processing such as interaural level difference (ILD), interaural time difference (ITD), spectral cues, etc. [2]
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