Volume 15: Sound, Vibration and Design 2009
DOI: 10.1115/imece2009-10798
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Microphone Array Analysis Methods Using Cross-Correlations

Abstract: Due to civilian noise complaints and damage claims, there is a need to establish an accurate record of impulse noise generated at military installations. Current noise monitoring systems are susceptible to false positive detection of impulse events due to wind noise. In order to analyze the characteristics of noise events, multiple channel data methods were investigated. A microphone array was used to collect four channel data of military impulse noise and wind noise. These data were then analyzed using cross-… Show more

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Cited by 27 publications
(25 citation statements)
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“…Owing to the complex wave structure of the membrane structure, the wind pressures of some measuring points like #9, #19, and #14 reveal negative values as shown in Figure 6, simultaneously leading to the negative correlation of the wind pressure in some areas. Second, the maximum of the cross-correlation function or the minimum of the negative correlation indicates the point in time where the signals are best aligned; that is, the time delay between the two signals is determined by the argument of the extreme value [38]; Figures 21(a) and 21(b) show the obvious delay time between the wind pressures of the measuring points due to the long distance and the changing wind direction. However, the delay time between the wind pressures of the measuring points in Figure 21(c) is relatively close to zero, which means that the wind simultaneously arrived at the BC side measuring points.…”
Section: The Correlation Of the Wind Pressures Between Measuring Pointsmentioning
confidence: 99%
“…Owing to the complex wave structure of the membrane structure, the wind pressures of some measuring points like #9, #19, and #14 reveal negative values as shown in Figure 6, simultaneously leading to the negative correlation of the wind pressure in some areas. Second, the maximum of the cross-correlation function or the minimum of the negative correlation indicates the point in time where the signals are best aligned; that is, the time delay between the two signals is determined by the argument of the extreme value [38]; Figures 21(a) and 21(b) show the obvious delay time between the wind pressures of the measuring points due to the long distance and the changing wind direction. However, the delay time between the wind pressures of the measuring points in Figure 21(c) is relatively close to zero, which means that the wind simultaneously arrived at the BC side measuring points.…”
Section: The Correlation Of the Wind Pressures Between Measuring Pointsmentioning
confidence: 99%
“…Wind noise is generated by the pressure variations from flow turbulence deflect the microphone diaphragm [10]. Therefore, the wind turbulence between microphones is comparatively uncorrelated, which can be used to distinguish the sound waves from the wind noise [11,12]. A min peak correlation coefficient measure was designed in [12] for wind noise analysis using large aperture array with radius of one meter.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, the wind turbulence between microphones is comparatively uncorrelated, which can be used to distinguish the sound waves from the wind noise [11,12]. A min peak correlation coefficient measure was designed in [12] for wind noise analysis using large aperture array with radius of one meter. Yet the low correlation is not a reliable feature for non-stationary wind noise detection with SAMA [10].…”
Section: Introductionmentioning
confidence: 99%
“…51 Ó 2015 Published by Elsevier B.V. 52 53 54 55 1. Introduction 56 Compared with point-to-point inspection using traditional 57 ultrasonic bulk waves, Lamb wave technique provides a 58 cost-effective inspection method in non-destructive evaluation 59 (NDE) and structural health monitoring (SHM), as Lamb wave is 60 able to travel a very long distance with little energy loss and can 61 be used to interrogate physically inaccessible areas of structures 62 and components. However, due to the multi-mode characteristics 63 and dispersive nature, Lamb wave propagation behavior is much 64 more complex than that of bulk waves.…”
mentioning
confidence: 99%
“…Cross correlation 122 analysis is used to measure the similarity between two signals at 123 different times. Although cross correlation analysis has been 124 widely used in many fields [57][58][59] …”
mentioning
confidence: 99%