Real-time vehicle noise cancellation techniques for gunshot acoustics

Consistent DOA estimation of heavily noisy gunshot signals using a microphone array

“…If we increase or decrease the time window length, we observed that it will include or exclude portions of noise, but it would not influence much the cross‐correlations for the purposes of DOA estimation. The noise can be considered short‐time stationary and uncorrelated with the impulsive gunshot signals [5].…”

“…The MB component propagates in a straight line, at the speed of sound, from the shooter position to the microphone array. The SW wavefront that reaches the array originates from a point known as ‘detach(ment) point’ [5], which is located on the bullet trajectory. Therefore, if we estimate the direction of arrival (DOA) using the SW component, we will obtain the direction of the ‘detach point’, whereas if we use the MB component in the DOA estimation routine, we obtain the direction from where the shot originated.…”

Investigating the potential of UAV for gunshot DoA estimation and shooter localization

“…There are a myriad of methods that can be employed in signal enhancement (SE) applied to gunshot signals. For instance, adaptive filtering, spectral subtraction, and median filtering [16], [17], [18]. As one of the main goals in this paper is to estimate DoA from noisy signals, it is natural to consider signal enhancement as a way to improve estimations.…”

Shooter localization using microphone arrays on elevated platforms

“…A. Substracción Espectral. Una de las causas de imprecisión en la estimación de DoA es la presencia de ruido, para lo cual, la técnica de substracción espectral aporta un importante progreso en la búsqueda de mejores resultados [11]- [13].…”