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Thursday, October 20 • 3:20pm - 3:40pm
Determining the Source Location of Gunshots From Digital Recordings

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Digital recordings, in the form of photographs, audio or video play an increasingly important evidentiary role in the criminal justice system. One type of audio recording that experts in acoustic forensics may encounter are those produced by the ShotSpotter Respond gunshot location system. This technical note introduces open-source software for extracting the location and timing metadata stored in these recordings, and for performing acoustic multilateration on a set of time differences of arrival determined from ShotSpotter files or any other digital audio file for which sufficiently accurate timing and location metadata are available. The process of determining the source location of a gunshot from three or more digital recordings is futher explained via a set of worked examples, including a simple single-shot incident and an incident in which seven shots were fired from a moving vehicle.

avatar for Rob Calhoun

Rob Calhoun

Co-Founder, ShotSpotter, Inc
A founder of ShotSpotter, Rob Calhoun has over 20 years of experience in the field of acoustic gunshot location. He holds S.B and Ph.D. degrees from the M.I.T. Department of Materials Science and Engineering as well as twelve U.S. patents. His favorite algorithm is the Fast Fourier... Read More →

Thursday October 20, 2022 3:20pm - 3:40pm EDT