Posted by mountain_jim
(here)

It's a solid overview, but falls short of a professional and comprehensive analysis. That would require experts, state-of-the-art tools, and a great deal of time. Also (I imagine) repeated experiments, on location, testing distances, different weapons and different audio signatures, to prove or disprove a hypothesis.
Also, according to some of the feedback I've read (of the above video) he hasn't accounted for at least two important data-points.
The audio is derived from two different locations, which would skew the timing of the sound as it reached the camera. Different sample rates would also offset timing.
Trump's microphone was being projected over speakers, which could account for some of the echo effects.
Well this was from the CCN article on 7/15, comes pretty close to what Chris is stating, while citing 3 different researchers, 2 of which appear to confirm the multiple shooters from their analysis.
Not comprehensive but professional per credentials, it appears to me.
Now we wait for a deeper dive by experts to prove or disprove this great start.
https://www.cnn.com/politics/live-ne...059a2dff21a270
5:10 a.m. EDT, July 15, 2024
Audio forensics suggest as many as three weapons fired at Trump rally
From CNN’s Gianluca Mezzofiore and Avery Schmitz
Forensic analysis suggests that as many as three weapons were fired at the Trump rally in Butler, Pennsylvania on Saturday.
The FBI said Sunday that the shooter acted alone.
The first three shots were consistent with alleged weapon A, the next five were consistent with alleged weapon B, and the final “acoustic impulse” was emitted by a possible weapon C, per audio analysis by Catalin Grigoras, director of the National Center for Media Forensics at the University of Colorado in Denver, and Cole Whitecotton, Senior Professional Research Associate at the same institution.
Audio analysis has also confirmed that the gunman was about 360 to 393 feet from the podium, according to forensics expert Robert Maher.
This conclusion aligns with CNN’s analysis that the gunman was on a rooftop 393 to 492 feet from the podium when shots rang out.
The shots exemplify a “crack-pop” sequence, typical when a supersonic bullet passes a microphone, before the “arrival of the corresponding muzzle blast sound,” Maher, who teaches audio forensics at Montana State University, told CNN.
The time between these markers places the shooter 110 to 120 meters from the microphone, Maher said, assuming the bullet is moving at an average speed of 800 to 1,000 meters per second, the equivalent of 2,600 to 3,280 feet per second.
CNN’s Hannah Rabinowitz, Evan Perez, and Ryan Young contributed reporting.