AP Release Recording Of Cuban 'Sonic Attack'

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AP Release Recording Of Cuban 'Sonic Attack'

Postby toucana on October 13th, 2017, 10:17 am 

AP have released some audio recording samples of the alleged sonic attacks experienced by US and Canadian diplomats in Cuba that have recently led to the US government shutting down operations and withdrawing staff from Havana.

https://apnews.com/88bb914f8b284088bce48e54f6736d84

At least 22 diplomats and embassy staff are claimed to have suffered hearing problems and various other forms of sensory disorientation as a result of what are deemed to be targeted sonic attacks of unknown origin.

The recordings released by AP which are said to be safe to listen to at normal volume levels on home computers or phones consist of high frequency chirping noises like masses of crickets, or some say, fingernails being scratched on blackboards.

A number of these recordings have been passed to the US Navy which has specialised resources for analysing unusual audio and sonar traces, but they have declined to make any public comment so far.

When studied with a spectrum analyser, the recording released by AP appears to have amplitude spikes involving at least 20 different frequencies, mostly at high pitches of around 18KHz to 19KHz which is on the upper limit of the human hearing range for many adults.

You can experiment with an online tone generator for comparison:
http://www.szynalski.com/tone-generator/

This may represent only part of what is being heard. Ultrasound frequencies above 20KHz can be detected by many animals such as dogs and cats which can hear up to 45KHz tones, while bats navigate by using echo-location squeaks of 100KHz or more.

It is also possible to stimulate the perception of ‘ghost tones’ by playing high frequency sine waves whose frequencies are set at certain ratios. These can produce sum or difference tones involving a ‘Missing Fundamental’ which are sometimes known as ‘Tartini Tones’.

https://en.wikipedia.org/wiki/Combination_tone

The fact that some victims of these sonic attacks only experience the effects in very precise locations such as the corner of one particular room raises the possibility that a highly directional hypersound beam technology is being deployed where an ultrasound signal is projected and the presence of a human head provokes a destructive frequency interference in the beam that drops the frequency down into the audible range in the immediate vicinity of the ears.

http://hypersound.com/pro/products/
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Re: AP Release Recording Of Cuban 'Sonic Attack'

Postby zetreque on October 14th, 2017, 6:47 pm 

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