Who invented the lrad

The LRAD devices have several settings, and can be used to give instructions at a long distance, or even set to create pulses up to decibels hearing a jet engine feet away registers dB in comparison.

They are currently deployed on naval ships to deter smaller boats from approaching. More than 20 countries are now using the LRAD. Israeli Defense Forces have used it to break up Palestinian protests, Japanese whaling ships have repelled environmental groups and several cruise ships have used it to fight off pirates in places like the Horn of Africa or Indian Ocean.

Most recently, mysterious incidents in China and Cuba in and led some to suspect that sound had been deployed as a weapon against Americans living in those countries. Chinese officials denied in late May that they had conducted a sonic attack on an American diplomat based in Guangzhou in southern China.

The diplomat said he suffered traumatic brain injury after feeling abnormal sounds and pressure in his ears over several months. Some U. Date of Patent: November 19, Inventor: James J. Croft, III. Variable directivity loud hailing device. Abstract: A system and method for varying the directionality of an acoustic output of a loud hailing and warning device is disclosed. The method includes the operation of placing a sliding high-pass filter in a signal path of a transducer array having a frequency-dependant dispersion characteristic.

A control is provided that varies a lower cutoff frequency of the sliding high-pass filter. Making cake in a sour economy. The Cheesecake Factory created smaller portions to survive the downturn.

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View our privacy policy CNNMoney. My dream is to launch my own business someday. After exposure, check yourself and others for the symptoms outlined above. Give calm, quiet care to your companions, which should help to restore the sense of self after the dehumanizing and frightening experience of police violence.

If someone is experiencing significant symptoms of sound exposure, encourage them to leave the scene and consult with a hearing specialist to address impacts. If you can, help them to get home safely, since they may be disoriented. As with any form of violence, those victimized by sound weapons need ongoing compassion and care. Continue to check in on anyone exposed to LRAD sound, or other police violence, and not only in the following days and weeks.

We as a community can help lessen the long-term effects of police violence trauma if we honestly and openly care for each other, as well as advocate for legal and political change.

Daphne Carr is a street medic, scholar, and organizer completing a dissertation on the history of police sound as weapons. Muff the Police! Her Twitter is policesound.