A hybrid spiral microphone array design for performance and portability

Aldeman, Matthew R.

doi:10.1016/j.apacoust.2020.107512

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…A similar strategy is used in the development of a planar antenna to characterise the acoustic sources produced by a moving train [ 29 ]. It is also possible to optimise the geometry by constraining certain positions, for example by favouring intersections between the axes and the spiral path in a spiral antenna [ 30 ]. In contrast, some authors seek to optimise an antenna with only three sensors in the case of first-order steerable differential antennas by using the least squares method to match a directivity pattern in a given direction [ 31 ].…”

Section: Localization Methods and Simulation Parametersmentioning

confidence: 99%

Acoustic Estimation of the Direction of Arrival of an Unmanned Aerial Vehicle Based on Frequency Tracking in the Time-Frequency Plane

Itare

Thomas

Raoof

et al. 2022

Sensors

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The development of unmanned aerial vehicles (UAVs) opens up a lot of opportunities but also brings some threats. Dealing with these threats is not easy and requires some good techniques. Knowing the location of the threat is essential to deal with an UAV that is displaying disturbing behavior. Many methods exist but can be very limited due to the size of UAVs or due to technological improvements over the years. However, the noise produced by the UAVs is still predominant, so it gives a good opening for the development of acoustic methods. The method presented here takes advantage of a microphone array with a processing based on time domain Delay and Sum Beamforming. In order to obtain a better signal to noise ratio, the UAV’s acoustic signature is taken into account in the processing by using a time-frequency representation of the beamformer’s output. Then, only the content related to this signature is considered to calculate the energy in one direction. This method enables to have a good robustness to noise and to localize an UAV with a poor spectral content or to separate two UAVs with different spectral contents. Simulation results and those of a real flight experiment are reported.

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Section: Localization Methods and Simulation Parametersmentioning

confidence: 99%

Acoustic Estimation of the Direction of Arrival of an Unmanned Aerial Vehicle Based on Frequency Tracking in the Time-Frequency Plane

Itare

Thomas

Raoof

et al. 2022

Sensors

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“…It was proposed that the design of a hybrid microphone array combined the portability and convenience benefits of a smaller spiral array design with the performance characteristics of a large array. Four improved spiral microphone arrays are proposed [5]. The array is constructed by placing the microphone on the axis of the point where the axis of the helical geometry is intercepted.…”

Section: Introductionmentioning

confidence: 99%

Research on multi-sound source localization performance based on leaf-shaped microphone array

Wang

Wei

2023

J. Phys.: Conf. Ser.

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In the research of multi-sound source localization, the geometric rules for the spatial arrangement of microphone arrays play a decisive role. When faced with multiple sound sources with close positions, traditional typical arrays are difficult to accurately locate the desired signals. Therefore, this paper proposes a leaf-shaped microphone array based on the theory of bionic sunflower spiral arrangement. When the incident signals are multiple sound sources with close positions, combined with the delay-sum beamforming algorithm, the performance of the leaf-shaped array is analyzed from the perspective of positioning accuracy and resolution. Compared with the uniform circular array and Arcondoulis spiral array, the results show that the leaf-shaped array has better resolution and anti-interference ability in the case of multiple sound sources with close positions.

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“…These sound source localizations are based on measuring the time difference it takes for the sound waves to reach different acoustic transducers or specialized acoustic actuators in the network. [4][5][6][7][8] So that their phase sensitivities are the most critical index affecting the measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study on the phase sensitivity of condenser type acoustic transducers at low frequencies

Liu

Zhang

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

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The phase sensitivity of the condenser type acoustic transducers at low frequencies is crucial for locating large-scale natural and manmade activities, but is now commonly calibrated based on comparison methods. Although the primary method, which traces its sensitivity back to the international standard unit is few studied. Recently, the explicit sensitivity models of the condenser type acoustic transducers based on the laser-pistonphone technique are built, and can be used to study the phase responses of acoustic transducers at infrasonic frequencies. So that, in this paper, the phase sensitivities of acoustic transducers when its rear vent connected to the calibrating sound field or outside atmosphere are studied in detail. Secondly, time domain analysis of generated sound pressures by displacement excitation are derived to reveal the mechanism of phase variation. Calculations show two distinct sensitivities with 90° phase lead and −10° phase lag limits for vent in field and vent out field calibrations, which are dominated by the pressure leakage and heat conduction effects at infrasonic frequencies.

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A hybrid spiral microphone array design for performance and portability

Cited by 7 publications

References 17 publications

Acoustic Estimation of the Direction of Arrival of an Unmanned Aerial Vehicle Based on Frequency Tracking in the Time-Frequency Plane

Acoustic Estimation of the Direction of Arrival of an Unmanned Aerial Vehicle Based on Frequency Tracking in the Time-Frequency Plane

Research on multi-sound source localization performance based on leaf-shaped microphone array

Theoretical study on the phase sensitivity of condenser type acoustic transducers at low frequencies

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