This readme.txt file was generated on 20200818 by Seth Cooper --------------------------------------------------- GENERAL INFORMATION --------------------------------------------------- Title of Dataset: Gunshots recorded in an open field using iPod Touch devices Files (one from each iPod Touch device): mic1raw.wav mic2raw16b.wav mic3raw.wav mic4raw.wav File Information: Filename: Short description: Filename: Short description If data set includes multiple files related to one another, include relationship here: Each data file is take from one iPod Touch device. See file rangedim.png for details on relative iPod locations. Mic 1. This location represents the sound experienced by someone who is being shot at. This locations should see early arrival of the bullet and impact noise and the muzzle blast, followed by the environmental noise. Mic 2. This represents an off-axis location which we expect to be identical to the same point symmetrical to the shooting axis. It can also represent a nearby location that is not targeted. Similar readings to Mic. 1 are expected, with the exception of the bullet noise and impact arrival time. Mic 3. This location involves greater a azimuth angle. It could represent, for example, the location of a nonshooting law enforcement officer and his recording device. At this location, we expect different bullet noise arrival characteristics, potentially larger environmental reflections, and the impact of the bullet hitting the target to be heard after muzzle blast. Mic 4. This location represents a posterior location. Due to the asymmetric nature of a muzzle blast, reduced amplitude is expected at this location along with a later arrival of the bullet impact noise relative to the muzzle blast. Principal Investigator Contact Information Name: Steven Shaw Institution: Montana State University Email: sshaw@montana.edu Associate or Co-investigator Contact Information Name: Seth Cooper Institution: Montana State University Email: seth.cooper@montana.edu Date of data collection: 20180629 Geographic location of data collection: Gallatin County, Montana Date files were created: 20190607 --------------------------------------------------- METHODOLOGICAL INFORMATION --------------------------------------------------- Four iPod Touch devices were used, running the software Auphonic Recorder 1.2.1, which was chosen becasue "all default iOS pre-processing is deactivated to get the raw audio signal." The settings used were "Uncompressed PCM Audio," a 48 kHz sample rate, 16-bit precision, and zero attenuation. see file create_data.m for data preprocessing and identification of gunshot events. The following firearems were discharged in order: Firearm_ID Class Firearm Ammunition Nominal fps # of shots ---------- ----- ------- ---------- ----------- ---------- 1 Pistol SigM11A1, 3.8" bbl 124 gr 9mm NATO, STANAG 4090, MEN 1200 4 2 Pistol Glock 19, 4" bbl 124 gr 9mm NATO, STANAG 4090, MEN 1200 3 3 Pistol Colt1911A1, 5" bbl 230 gr 45 ACP, Winchester 835 3 4 Pistol Sig 220, 4.2" bbl 230 gr 45 ACP, Winchester 835 3 5 Rifle AR-15, 18" bbl, 1-7 twist 5.56 NATO / M855 62 grain, Lake City n/a 3 6 Rifle 308W 24", Surgeon custom, 1-10 twist 7.62 NATO, Mk 316 MOD 0 equivalent 2600 3 7 Rifle 308W 18", Tikka T3, 1-10 twist 7.62 NATO, Mk 316 MOD 0 equivalent 2500 3 --------------------------------------------------- SHARING/ACCESS INFORMATION --------------------------------------------------- Licenses/restrictions placed on the data: CC0. To the extent possible under law, the author has waived all copyright and related or neighboring rights to this work. This work is published from the United States. --------------------------------------------------- CREDITS --------------------------------------------------- Based on a template by Cornell University Research Data Management Service Group: https://data.research.cornell.edu/content/readme