“…Previous investigations of firearm discharge have focused on outdoor source location, [14][15][16] and identification of firearm and ammunition type using shockwave analysis. 17,18 Other investigators have studied correlation and linear predictive coding for firearm detection and source recognition. 19 Threshold detection schemes using six different waveform characteristics, e.g., magnitude of signal absolute value, median filter, Teager energy operator, correlation against a template, among others mainly for outdoor gunshot detection and source classification have been described by Chac on-Rodr ıguez et al 20 More generally, extraction of acoustic cues for forensic purposes has been investigated by Hong and colleagues.…”