The professor of the Faculty of Dramatic Arts in Belgrade, Aleksandar Jaćić, analyzed the sound of the video that appeared on social networks, created in Kneza Miloša Street, above the "1. Maj" pharmacy, and says that it is unlikely that it was caused by the behavior of people in the crowd
FDU professor Aleksandar Jaćić, who deals with sound analysis, processed one of the recordings from the protest held March 15 in Belgrade that appeared on social networks and based on the frequency of the sound, concluded that it was a very deep one sound low frequency, similar to an airplane taking off.
Many witnesses to the event exactly at 19:11, they felt something they describe differently, even if they were standing next to each other. It's as if the plane flies two meters above the heads. Or that an invisible car or bus rushes down the street. Some heard a "whoosh" or a whoosh, a sound familiar from Formula 1 or that of an ominously approaching cruise missile.
The roar in the recording analyzed by Professor Jaćić comes from the direction on the right, in the direction of Ulica Kralja Milana towards Slavija, but he also heard the same sound in the analysis of other recordings from different locations. It is about the sound of low frequencies.
See Professor Jaćić's analysis:
symptoms
As Jaćić explains, exposure to low frequencies can cause a feeling of discomfort or pressure in the body, especially in the ear area, and people can feel vibrations or pulsations.
"Low frequencies can trigger stress reactions in the body - increased blood pressure, increased heart rate, sweating, or a feeling of heaviness without a clear cause. Some people may experience nausea, headaches or a general feeling of weakness, especially if the sound is intense. This can activate mechanisms in the brain that interpret low frequencies as a sign of danger, which can trigger a 'fight or flight' reaction, even when there is no real threat," Jaćić explains.
These are exactly some of the symptoms that people reported feeling after the protest in Belgrade and why they went to the doctor.
Software analysis
Jaćić analyzed the sound through the software Izotop RX, which is mainly intended for processing sound with which something is not right.
Analyzing this and other recordings, he says he has never come across a single similar sound in any recordings he has previously processed.
"The sound is closest to a fast moving airplane and I've never come across a similar sound in dialogue and something people are doing. I can't say it sounds like human activity to me, I can never say 15 percent, but I can say with great certainty that it was not human activity, especially since the same sound was heard in multi-location recordings made during the XNUMX-minute silence."
The non-governmental organization Earshot concluded on the basis of audio recordings made on March 15 in Belgrade in Kralja Milana Street that the sonic boom matches the vortex cannon and that they show that the source of the sound was located at least 700 meters from the place where it was recorded.
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