Technical Notes: Using Microphone Arrays to Detect Moving Vehicle Velocity

Peral-Orts, Ramón; Velasco-Sánchez, Emilio; Campillo-Davó, Nuria; Campello-Vicente, Héctor

doi:10.2478/aoa-2013-0048

Cited by 4 publications

(4 citation statements)

References 8 publications

(6 reference statements)

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“…This modification is intended to obtain the SPL from the pedestrian point of view in a road-crossing scenario since this is one of the situations that greater risk entail for pedestrians. At the same time, the sound directivity was measured using a linear microphone array [37]. The system was composed of 9 omnidirectional microphones, B&K Type 4958, located perpendicularly to the track and 3 meters away from it.…”

Section: Experimental Designmentioning

confidence: 99%

“…Some measurement techniques can be found on the literature to determine this parameter: stationary vehicle directivity [28]; moving sources [29]; vertical directivity for moving sources (trains [30,31,32], aircraft [33,34], road vehicles [35]); horizontal directivity of road vehicles [36]. In order to determine the radiation pattern of the vehicles, the use of a linear microphone array during pass-by tests may be appropriate to detect the position and speed of the moving noise source [37] and therefore, to obtain the sound pressure level (SPL) for each angle suppressing background noise.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic Directivity and Detectability of Electric Powered Two-Wheelers

Poveda-Martínez¹,

Peral-Orts²,

Campillo-Davó³

et al. 2017

Acta Acustica united with Acustica

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Since motorcycles are one of the main sources of noise in urban environments, the use of electric powered two-wheelers may contribute to the improvement of soundscapes in Smart Cities. However, quiet vehicles can lead to an increased risk of accident for pedestrians and other drivers. In order to assess the noise generated by powered two-wheelers and their detectability, five different low capacity motorcycles were measured in a pass-by noise test. The measurements were performed at different speeds using a linear microphone array and a dummy head. The sound directivity radiated by the moving sources was studied with a microphone array. To establish the detectability of powered two-wheelers, thirty-seven subjects participated in an auditory test consisting on a virtual road-crossing scenario. The subjects had to detect the approaching of a vehicle at 20 km/h. The results showed a significant reduction in the sound pressure level emitted by electric motorcycles at low-speed, as well as a notable increase in sound directivity with velocity. The reaction time obtained for the detection of electric powered two-wheelers was higher compared to the traditional propulsion ones. The results highlighted the risk posed by this kind of electric vehicles for pedestrians.

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Section: Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic Directivity and Detectability of Electric Powered Two-Wheelers

Poveda-Martínez¹,

Peral-Orts²,

Campillo-Davó³

et al. 2017

Acta Acustica united with Acustica

Self Cite

View full text Add to dashboard Cite

show abstract

“…Угловое разрешение МР зависит от апертуры (линейного размера МР), длины волны (частоты сиг-нала), направления луча и метода обработки сигнала [27]:…”

Section: базовый алгоритм формирования диаграммы направленностиunclassified

“…Одним из наиболее эффективных решений оказалось неравномерное по апертуре расположение микрофонов, так называемые неэквидистантные (неравномерные) МР [26][27][28][29].…”

Section: основные проблемы эквидистантных микрофонных решетокunclassified

Application of microphone arrays for distant speech capture

Борисович¹

2015

Naučno-teh. vestn. inf. tehnol. meh. opt.

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Design of Acoustic Tubes Array and Application to Measuring Acoustic Loads in Supersonic Airflow

Long¹,

Li²,

Fu³

et al. 2015

Archives of Acoustics

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In the acoustic fatigue experiment for hypersonic vehicle in simulated harsh service environment on ground, acoustic loads on the surface of test pieces of the vehicle need to be measured. However, for the normal microphones without high temperature resistance ability, the near field sound measurement cannot be achieved. In this work, on the basis of previous researches, an acoustic tubes array is designed to achieve the near field measurement of acoustic loads on the surface of the test piece in the supersonic airflow with high temperature achieved by coherent jet oxygen lance. Firstly, the process of designing this acoustic tubes array is introduced. Secondly, the equality of phase differences at the front and at the end of the tubes is stated and proved using a phase differences test with an acoustic tubes array whose design is presented in this text; therefore, the phase differences of signals acquired by microphones can be directly applied to beamforming algorithm to determine the acoustic load source. Finally, using above mentioned acoustic tubes array, measurement of acoustic load, with and without a test piece in the supersonic airflow made by the coherent jet oxygen lance, is conducted respectively, and the measurements results are analyzed.

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Technical Notes: Using Microphone Arrays to Detect Moving Vehicle Velocity

Cited by 4 publications

References 8 publications

Acoustic Directivity and Detectability of Electric Powered Two-Wheelers

Acoustic Directivity and Detectability of Electric Powered Two-Wheelers

Application of microphone arrays for distant speech capture

Design of Acoustic Tubes Array and Application to Measuring Acoustic Loads in Supersonic Airflow

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